diff --git a/_layouts/blog.html b/_layouts/blog.html index c6ff8d745319b..3fe83d87ba3e0 100644 --- a/_layouts/blog.html +++ b/_layouts/blog.html @@ -90,8 +90,7 @@

Kubernetes Blog

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{{ page.date | date: ' %A, %B %-d, %Y' }}

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- - @Kubernetesio - View on Github - #kubernetes-users - Stack Overflow - Download Kubernetes + + @Kubernetesio + View on Github + #kubernetes-users + Stack Overflow + Download Kubernetes
diff --git a/_posts/2015-03-20-Welcome-to-the-Kubernetes-Blog!.md b/blog/_posts/2015-03-20-Welcome-to-the-Kubernetes-Blog!.md similarity index 96% rename from _posts/2015-03-20-Welcome-to-the-Kubernetes-Blog!.md rename to blog/_posts/2015-03-20-Welcome-to-the-Kubernetes-Blog!.md index cc2fdd9a3e1dc..bad06d7779bcc 100644 --- a/_posts/2015-03-20-Welcome-to-the-Kubernetes-Blog!.md +++ b/blog/_posts/2015-03-20-Welcome-to-the-Kubernetes-Blog!.md @@ -1,9 +1,7 @@ --- layout: blog -title: " Welcome to the Kubernetes Blog! " +title: Welcome to the Kubernetes Blog! date: Saturday, March 20, 2015 -pagination: - enabled: true --- Welcome to the new Kubernetes blog. Follow this blog to learn about the Kubernetes Open Source project. We plan to post release notes, how-to articles, events, and maybe even some off topic fun here from time to time. diff --git a/_posts/2015-03-23-Kubernetes-Gathering-Videos.md b/blog/_posts/2015-03-23-Kubernetes-Gathering-Videos.md similarity index 100% rename from _posts/2015-03-23-Kubernetes-Gathering-Videos.md rename to blog/_posts/2015-03-23-Kubernetes-Gathering-Videos.md diff --git a/_posts/2015-03-28-Weekly-Kubernetes-Community-Hangout-Notes---March-27-2015.md b/blog/_posts/2015-03-28-Weekly-Kubernetes-Community-Hangout-Notes---March-27-2015.md similarity index 100% rename from _posts/2015-03-28-Weekly-Kubernetes-Community-Hangout-Notes---March-27-2015.md rename to blog/_posts/2015-03-28-Weekly-Kubernetes-Community-Hangout-Notes---March-27-2015.md diff --git a/_posts/2015-03-31-Paricipate-in-a-Kubernetes-User-Experience-Study.md b/blog/_posts/2015-03-31-Paricipate-in-a-Kubernetes-User-Experience-Study.md similarity index 100% rename from _posts/2015-03-31-Paricipate-in-a-Kubernetes-User-Experience-Study.md rename to blog/_posts/2015-03-31-Paricipate-in-a-Kubernetes-User-Experience-Study.md diff --git a/_posts/2015-04-04-Weekly-Kubernetes-Community-Hangout-Notes---April-3-2015.md b/blog/_posts/2015-04-04-Weekly-Kubernetes-Community-Hangout-Notes---April-3-2015.md similarity index 100% rename from _posts/2015-04-04-Weekly-Kubernetes-Community-Hangout-Notes---April-3-2015.md rename to blog/_posts/2015-04-04-Weekly-Kubernetes-Community-Hangout-Notes---April-3-2015.md diff --git a/_posts/2015-04-06-Faster-than-a-speeding-Latte.md b/blog/_posts/2015-04-06-Faster-than-a-speeding-Latte.md similarity index 100% rename from _posts/2015-04-06-Faster-than-a-speeding-Latte.md rename to blog/_posts/2015-04-06-Faster-than-a-speeding-Latte.md diff --git a/_posts/2015-04-11-Weekly-Kubernetes-Community-Hangout-Notes---April-10-2015.md b/blog/_posts/2015-04-11-Weekly-Kubernetes-Community-Hangout-Notes---April-10-2015.md similarity index 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index 100% rename from _posts/2016-09-28-How-we-made-Kubernetes-insanely-easy-to-install.md rename to blog/_posts/2016-09-28-How-we-made-Kubernetes-insanely-easy-to-install.md diff --git "a/_posts/2016-10-03-How-we-improved-Kubernetes-Dashboard-UI-in-14-for-your-production-needs\342\200\213.md" "b/blog/_posts/2016-10-03-How-we-improved-Kubernetes-Dashboard-UI-in-14-for-your-production-needs\342\200\213.md" similarity index 100% rename from "_posts/2016-10-03-How-we-improved-Kubernetes-Dashboard-UI-in-14-for-your-production-needs\342\200\213.md" rename to "blog/_posts/2016-10-03-How-we-improved-Kubernetes-Dashboard-UI-in-14-for-your-production-needs\342\200\213.md" diff --git a/_posts/2016-10-07-Dynamic-Provisioning-and-Storage-Classes-in-Kubernetes.md b/blog/_posts/2016-10-07-Dynamic-Provisioning-and-Storage-Classes-in-Kubernetes.md similarity index 100% rename from _posts/2016-10-07-Dynamic-Provisioning-and-Storage-Classes-in-Kubernetes.md rename to 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blog/_posts/2016-10-14-Building-Globally-Distributed-Services-using-Kubernetes-Cluster-Federation.md diff --git a/_posts/2016-10-24--How-We-Architected-and-Run-Kubernetes-on-OpenStack-at-Scale-at-Yahoo!-JAPAN.md b/blog/_posts/2016-10-24--How-We-Architected-and-Run-Kubernetes-on-OpenStack-at-Scale-at-Yahoo!-JAPAN.md similarity index 100% rename from _posts/2016-10-24--How-We-Architected-and-Run-Kubernetes-on-OpenStack-at-Scale-at-Yahoo!-JAPAN.md rename to blog/_posts/2016-10-24--How-We-Architected-and-Run-Kubernetes-on-OpenStack-at-Scale-at-Yahoo!-JAPAN.md diff --git a/_posts/2016-10-31-Introducing-Kubernetes-Service-Partners-program-and-a-redesigned-Partners-page.md b/blog/_posts/2016-10-31-Introducing-Kubernetes-Service-Partners-program-and-a-redesigned-Partners-page.md similarity index 100% rename from _posts/2016-10-31-Introducing-Kubernetes-Service-Partners-program-and-a-redesigned-Partners-page.md rename to blog/_posts/2016-10-31-Introducing-Kubernetes-Service-Partners-program-and-a-redesigned-Partners-page.md diff --git a/_posts/2016-10-31-Tail-Kubernetes-with-Stern.md b/blog/_posts/2016-10-31-Tail-Kubernetes-with-Stern.md similarity index 100% rename from _posts/2016-10-31-Tail-Kubernetes-with-Stern.md rename to blog/_posts/2016-10-31-Tail-Kubernetes-with-Stern.md diff --git a/_posts/2016-11-07-Bringing-Kubernetes-Support-to-Azure-Container-Service.md b/blog/_posts/2016-11-07-Bringing-Kubernetes-Support-to-Azure-Container-Service.md similarity index 100% rename from _posts/2016-11-07-Bringing-Kubernetes-Support-to-Azure-Container-Service.md rename to blog/_posts/2016-11-07-Bringing-Kubernetes-Support-to-Azure-Container-Service.md diff --git a/_posts/2016-11-07-Modernizing-the-Skytap-Cloud-Micro-Service-Architecture-with-Kubernetes.md b/blog/_posts/2016-11-07-Modernizing-the-Skytap-Cloud-Micro-Service-Architecture-with-Kubernetes.md similarity index 100% rename from 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_posts/2017-07-14-How-Watson-Health-Cloud-Deploys-Applications-with-Kubernetes.md rename to blog/_posts/2017-07-14-How-Watson-Health-Cloud-Deploys-Applications-with-Kubernetes.md diff --git a/_posts/2017-07-28-Happy-Second-Birthday-A-Kubernetes-Retrospective.md b/blog/_posts/2017-07-28-Happy-Second-Birthday-A-Kubernetes-Retrospective.md similarity index 100% rename from _posts/2017-07-28-Happy-Second-Birthday-A-Kubernetes-Retrospective.md rename to blog/_posts/2017-07-28-Happy-Second-Birthday-A-Kubernetes-Retrospective.md diff --git a/_posts/2017-08-10-Kompose-Helps-Developers-Move-Docker-Compose-Files-to-Kubernetes.md b/blog/_posts/2017-08-10-Kompose-Helps-Developers-Move-Docker-Compose-Files-to-Kubernetes.md similarity index 100% rename from _posts/2017-08-10-Kompose-Helps-Developers-Move-Docker-Compose-Files-to-Kubernetes.md rename to blog/_posts/2017-08-10-Kompose-Helps-Developers-Move-Docker-Compose-Files-to-Kubernetes.md diff --git a/_posts/2017-08-11-High-Performance-Networking-with-EC2-Virtual-Private-Clouds.md b/blog/_posts/2017-08-11-High-Performance-Networking-with-EC2-Virtual-Private-Clouds.md similarity index 100% rename from _posts/2017-08-11-High-Performance-Networking-with-EC2-Virtual-Private-Clouds.md rename to blog/_posts/2017-08-11-High-Performance-Networking-with-EC2-Virtual-Private-Clouds.md diff --git a/_posts/2017-08-22-Kubernetes-Meets-High-Performance-Computing.md b/blog/_posts/2017-08-22-Kubernetes-Meets-High-Performance-Computing.md similarity index 100% rename from _posts/2017-08-22-Kubernetes-Meets-High-Performance-Computing.md rename to blog/_posts/2017-08-22-Kubernetes-Meets-High-Performance-Computing.md diff --git a/_posts/2017-09-08-Windows-Networking-at-Parity-with-Linux-for-Kubernetes.md b/blog/_posts/2017-09-08-Windows-Networking-at-Parity-with-Linux-for-Kubernetes.md similarity index 100% rename from _posts/2017-09-08-Windows-Networking-at-Parity-with-Linux-for-Kubernetes.md rename to blog/_posts/2017-09-08-Windows-Networking-at-Parity-with-Linux-for-Kubernetes.md diff --git a/_posts/2017-09-21-Introducing-the-Resource-Management-Working-Group.md b/blog/_posts/2017-09-21-Introducing-the-Resource-Management-Working-Group.md similarity index 100% rename from _posts/2017-09-21-Introducing-the-Resource-Management-Working-Group.md rename to blog/_posts/2017-09-21-Introducing-the-Resource-Management-Working-Group.md diff --git a/_posts/2017-09-27-Kubernetes-StatefulSets-&-DaemonSets-Updates.md b/blog/_posts/2017-09-27-Kubernetes-StatefulSets-&-DaemonSets-Updates.md similarity index 100% rename from _posts/2017-09-27-Kubernetes-StatefulSets-&-DaemonSets-Updates.md rename to blog/_posts/2017-09-27-Kubernetes-StatefulSets-&-DaemonSets-Updates.md diff --git a/_posts/2017-09-29-Kubernetes-18-Security,-Workloads-and-Feature-Depth.md b/blog/_posts/2017-09-29-Kubernetes-18-Security,-Workloads-and-Feature-Depth.md similarity index 100% rename from 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a/_posts/2017-10-19-Introducing-Software-Certification-for-Kubernetes.md b/blog/_posts/2017-10-19-Introducing-Software-Certification-for-Kubernetes.md similarity index 100% rename from _posts/2017-10-19-Introducing-Software-Certification-for-Kubernetes.md rename to blog/_posts/2017-10-19-Introducing-Software-Certification-for-Kubernetes.md diff --git a/_posts/2017-10-24-Five-Days-of-Kubernetes-18.md b/blog/_posts/2017-10-24-Five-Days-of-Kubernetes-18.md similarity index 100% rename from _posts/2017-10-24-Five-Days-of-Kubernetes-18.md rename to blog/_posts/2017-10-24-Five-Days-of-Kubernetes-18.md diff --git a/_posts/2017-10-25--kubeadm-v18-Released-Introducing-Easy-Upgrades-for-Kubernetes-Clusters.md b/blog/_posts/2017-10-25--kubeadm-v18-Released-Introducing-Easy-Upgrades-for-Kubernetes-Clusters.md similarity index 100% rename from _posts/2017-10-25--kubeadm-v18-Released-Introducing-Easy-Upgrades-for-Kubernetes-Clusters.md rename to 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b/blog/_posts/2017-11-17-Autoscaling-in-Kubernetes.md similarity index 100% rename from _posts/2017-11-17-Autoscaling-in-Kubernetes.md rename to blog/_posts/2017-11-17-Autoscaling-in-Kubernetes.md diff --git a/_posts/2017-12-06-PaddlePaddle-Fluid-Elastic-Deep-Learning-on-Kubernetes.md b/blog/_posts/2017-12-06-PaddlePaddle-Fluid-Elastic-Deep-Learning-on-Kubernetes.md similarity index 100% rename from _posts/2017-12-06-PaddlePaddle-Fluid-Elastic-Deep-Learning-on-Kubernetes.md rename to blog/_posts/2017-12-06-PaddlePaddle-Fluid-Elastic-Deep-Learning-on-Kubernetes.md diff --git a/_posts/2017-12-07-Using-eBPF-in-Kubernetes.md b/blog/_posts/2017-12-07-Using-eBPF-in-Kubernetes.md similarity index 100% rename from _posts/2017-12-07-Using-eBPF-in-Kubernetes.md rename to blog/_posts/2017-12-07-Using-eBPF-in-Kubernetes.md diff --git a/_posts/2017-12-15-Kubernetes-19-Apps-Workloads-GA-and-Expanded-Ecosystem.md b/blog/_posts/2017-12-15-Kubernetes-19-Apps-Workloads-GA-and-Expanded-Ecosystem.md similarity index 100% rename from _posts/2017-12-15-Kubernetes-19-Apps-Workloads-GA-and-Expanded-Ecosystem.md rename to blog/_posts/2017-12-15-Kubernetes-19-Apps-Workloads-GA-and-Expanded-Ecosystem.md diff --git a/_posts/2017-12-21-Introducing-Kubeflow---A-Composable,-Portable,-Scalable-ML-Stack-Built-for-Kubernetes.md b/blog/_posts/2017-12-21-Introducing-Kubeflow---A-Composable,-Portable,-Scalable-ML-Stack-Built-for-Kubernetes.md similarity index 100% rename from _posts/2017-12-21-Introducing-Kubeflow---A-Composable,-Portable,-Scalable-ML-Stack-Built-for-Kubernetes.md rename to blog/_posts/2017-12-21-Introducing-Kubeflow---A-Composable,-Portable,-Scalable-ML-Stack-Built-for-Kubernetes.md diff --git a/_posts/2018-01-08-Five-Days-of-Kubernetes-19.md b/blog/_posts/2018-01-08-Five-Days-of-Kubernetes-19.md similarity index 100% rename from _posts/2018-01-08-Five-Days-of-Kubernetes-19.md rename to blog/_posts/2018-01-08-Five-Days-of-Kubernetes-19.md diff --git a/_posts/2018-01-09-Kubernetes-v19-releases-beta-support-for-Windows-Server-Containers.md b/blog/_posts/2018-01-09-Kubernetes-v19-releases-beta-support-for-Windows-Server-Containers.md similarity index 100% rename from _posts/2018-01-09-Kubernetes-v19-releases-beta-support-for-Windows-Server-Containers.md rename to blog/_posts/2018-01-09-Kubernetes-v19-releases-beta-support-for-Windows-Server-Containers.md diff --git a/_posts/2018-01-10-Introducing-Container-Storage-Interface-(CSI)-Alpha-for-Kubernetes.md b/blog/_posts/2018-01-10-Introducing-Container-Storage-Interface-(CSI)-Alpha-for-Kubernetes.md similarity index 100% rename from _posts/2018-01-10-Introducing-Container-Storage-Interface-(CSI)-Alpha-for-Kubernetes.md rename to blog/_posts/2018-01-10-Introducing-Container-Storage-Interface-(CSI)-Alpha-for-Kubernetes.md diff --git a/_posts/2018-01-11-Extensible-Admission-is-Beta.md b/blog/_posts/2018-01-11-Extensible-Admission-is-Beta.md similarity index 100% rename from _posts/2018-01-11-Extensible-Admission-is-Beta.md rename to blog/_posts/2018-01-11-Extensible-Admission-is-Beta.md diff --git a/_posts/2018-01-12-Introducing-client-go-version-6.md b/blog/_posts/2018-01-12-Introducing-client-go-version-6.md similarity index 100% rename from _posts/2018-01-12-Introducing-client-go-version-6.md rename to blog/_posts/2018-01-12-Introducing-client-go-version-6.md diff --git a/_posts/2018-01-15-Core-Workloads-API-GA.md b/blog/_posts/2018-01-15-Core-Workloads-API-GA.md similarity index 100% rename from _posts/2018-01-15-Core-Workloads-API-GA.md rename to blog/_posts/2018-01-15-Core-Workloads-API-GA.md diff --git a/_posts/2018-01-25-Reporting-Errors-from-Control-Plane-to-Applications-Using-Kubernetes-Events.md b/blog/_posts/2018-01-25-Reporting-Errors-from-Control-Plane-to-Applications-Using-Kubernetes-Events.md similarity index 100% rename from _posts/2018-01-25-Reporting-Errors-from-Control-Plane-to-Applications-Using-Kubernetes-Events.md rename to blog/_posts/2018-01-25-Reporting-Errors-from-Control-Plane-to-Applications-Using-Kubernetes-Events.md diff --git a/blog/_posts/2018-03-01-First-Beta-Version-of-Kubernetes-110-is-Here-Your-Chance-to-Provide-Feedback.md b/blog/_posts/2018-03-01-First-Beta-Version-of-Kubernetes-110-is-Here-Your-Chance-to-Provide-Feedback.md new file mode 100644 index 0000000000000..10e922dab0f7c --- /dev/null +++ b/blog/_posts/2018-03-01-First-Beta-Version-of-Kubernetes-110-is-Here-Your-Chance-to-Provide-Feedback.md @@ -0,0 +1,103 @@ +--- +layout: blog +title: "Kubernetes: First Beta Version of Kubernetes 1.10 is Here" +date: Friday, March 2, 2018 +--- + +**Editor's note: Today's post is by Nick Chase. Nick is Head of Content at [Mirantis][1].** +The Kubernetes community has released the first beta version of Kubernetes 1.10, which means you can now try out some of the new features and give your feedback to the release team ahead of the official release. The release, currently scheduled for March 21, 2018, is targeting the inclusion of more than a dozen brand new alpha features and more mature versions of more than two dozen more. + +Specifically, Kubernetes 1.10 will include production-ready versions of Kubelet TLS Bootstrapping, API aggregation, and more detailed storage metrics. + +Some of these features will look familiar because they emerged at earlier stages in previous releases. Each stage has specific meanings: + +* **stable**: The same as "generally available", features in this stage have been thoroughly tested and can be used in production environments. +* **beta**: The feature has been around long enough that the team is confident that the feature itself is on track to be included as a stable feature, and any API calls aren't going to change. You can use and test these features, but including them in mission-critical production environments is not advised because they are not completely hardened. +* **alpha**: New features generally come in at this stage. These features are still being explored. APIs and options may change in future versions, or the feature itself may disappear. Definitely not for production environments. +You can download the latest release of Kubernetes 1.10 from . To give feedback to the development community, [create an issue in the Kubernetes 1.10 milestone][2] and tag the appropriate SIG before March 9. + +Here's what to look for, though you should remember that while this is the current plan as of this writing, there's always a possibility that one or more features may be held for a future release. We'll start with authentication. + +### Authentication (SIG-Auth) + +1. [Kubelet TLS Bootstrap][3] (stable): Kubelet TLS bootstrapping is probably the "headliner" of the Kubernetes 1.10 release as it becomes available for production environments. It provides the ability for a new kubelet to create a certificate signing request, which enables you to add new nodes to your cluster without having to either manually add security certificates or use self-signed certificates that eliminate many of the benefits of having certificates in the first place. +2. [Pod Security Policy moves to its own API group][4] (beta): The beta release of the Pod Security Policy lets administrators decide what contexts pods can run in. In other words, you have the ability to prevent unprivileged users from creating privileged pods -- that is, pods that can perform actions such as writing files or accessing Secrets -- in particular namespaces. +3. [Limit node access to API][5] (beta): Also in beta, you now have the ability to limit calls to the API on a node to just that specific node, and to ensure that a node is only calling its own API, and not those on other nodes. +4. [External client-go credential providers][6] (alpha): client-go is the Go language client for accessing the Kubernetes API. This feature adds the ability to add external credential providers. For example, Amazon might want to create its own authenticator to validate interaction with EKS clusters; this feature enables them to do that without having to include their authenticator in the Kubernetes codebase. +5. [TokenRequest API][7] (alpha): The TokenRequest API provides the groundwork for much needed improvements to service account tokens; this feature enables creation of tokens that aren't persisted in the Secrets API, that are targeted for specific audiences (such as external secret stores), have configurable expiries, and are bindable to specific pods. + +### Networking (SIG-Network) + +1. [Support configurable pod resolv.conf][8] (beta): You now have the ability to specifically control DNS for a single pod, rather than relying on the overall cluster DNS. +2. Although the feature is called [Switch default DNS plugin to CoreDNS][9] (beta), that's not actually what will happen in this cycle. The community has been working on the switch from kube-dns, which includes dnsmasq, to CoreDNS, another CNCF project with fewer moving parts, for several releases. In Kubernetes 1.10, the default will still be kube-dns, but when CoreDNS reaches feature parity with kube-dns, the team will look at making it the default. +3. [Topology aware routing of services][10] (alpha): The ability to distribute workloads is one of the advantages of Kubernetes, but one thing that has been missing until now is the ability to keep workloads and services geographically close together for latency purposes. Topology aware routing will help with this problem. (This functionality may be delayed until Kubernetes 1.11.) +4. [Make NodePort IP address configurable][11] (alpha): Not having to specify IP addresses in a Kubernetes cluster is great -- until you actually need to know what one of those addresses is ahead of time, such as for setting up database replication or other tasks. You will now have the ability to specifically configure NodePort IP addresses to solve this problem. (This functionality may be delayed until Kubernetes 1.11.) + +### Kubernetes APIs (SIG-API-machinery) + +1. [API Aggregation][12] (stable): Kubernetes makes it possible to extend its API by creating your own functionality and registering your functions so that they can be served alongside the core K8s functionality. This capability will be upgraded to "stable" in Kubernetes 1.10, so you can use it in production. Additionally, SIG-CLI is adding a feature called [kubectl get and describe should work well with extensions][13] (alpha) to make the server, rather than the client, return this information for a smoother user experience. +2. [Support for self-hosting authorizer webhook][14] (alpha): Earlier versions of Kubernetes brought us the authorizer webhooks, which make it possible to customize the enforcement of permissions before commands are executed. Those webhooks, however, have to live somewhere, and this new feature makes it possible to host them in the cluster itself. + +### Storage (SIG-Storage) + +1. [Detailed storage metrics of internal state][15] (stable): With a distributed system such as Kubernetes, it's particularly important to know what's going on inside the system at any given time, either for troubleshooting purposes or simply for automation. This release brings to general availability detailed metrics of what's going in inside the storage systems, including metrics such as mount and unmount time, number of volumes in a particular state, and number of orphaned pod directories. You can find a [full list in this design document][16]. +2. [Mount namespace propagation][17] (beta): This feature allows a container to mount a volume as rslave so that host mounts can be seen inside the container, or as rshared so that any mounts from inside the container are reflected in the host's mount namespace. The default for this feature is rslave. +3. [Local Ephemeral Storage Capacity Isolation][18] (beta): Without this feature in place, every pod on a node that is using ephemeral storage is pulling from the same pool, and allocating storage is on a "best-effort" basis; in other words, a pod never knows for sure how much space it has available. This function provides the ability for a pod to reserve its own storage. +4. [Out-of-tree CSI Volume Plugins][19] (beta): Kubernetes 1.9 announced the release of the Container Storage Interface, which provides a standard way for vendors to provide storage to Kubernetes. This function makes it possible for them to create drivers that live "out-of-tree", or out of the normal Kubernetes core. This means that vendors can control their own plugins and don't have to rely on the community for code reviews and approvals. +5. [Local Persistent Storage][20] (beta): This feature enables PersistentVolumes to be created with locally attached disks, and not just network volumes. +6. [Prevent deletion of Persistent Volume Claims that are used by a pod][21] (beta) and 7. [Prevent deletion of Persistent Volume that is bound to a Persistent Volume Claim][22] (beta): In previous versions of Kubernetes it was possible to delete storage that is in use by a pod, causing massive problems for the pod. These features provide validation that prevents that from happening. +7. Running out of storage space on your Persistent Volume? If you are, you can use [Add support for online resizing of PVs][23] (alpha) to enlarge the underlying volume it without disrupting existing data. This also works in conjunction with the new [Add resize support for FlexVolume][24] (alpha); FlexVolumes are vendor-supported volumes implemented through [FlexVolume][25] plugins. +8. [Topology Aware Volume Scheduling][26] (beta): This feature enables you to specify topology constraints on PersistentVolumes and have those constraints evaluated by the scheduler. It also delays the initial PersistentVolumeClaim binding until the Pod has been scheduled so that the volume binding decision is smarter and considers all Pod scheduling constraints as well. At the moment, this feature is most useful for local persistent volumes, but support for dynamic provisioning is under development. + + + +### Node management (SIG-Node) + +1. [Dynamic Kubelet Configuration][27] (beta): Kubernetes makes it easy to make changes to existing clusters, such as increasing the number of replicas or making a service available over the network. This feature makes it possible to change Kubernetes itself (or rather, the Kubelet that runs Kubernetes behind the scenes) without bringing down the node on which Kubelet is running. +2. [CRI validation test suite][28] (beta): The Container Runtime Interface (CRI) makes it possible to run containers other than Docker (such as Rkt containers or even virtual machines using Virtlet) on Kubernetes. This features provides a suite of validation tests to make certain that these CRI implementations are compliant, enabling developers to more easily find problems. +3. [Configurable Pod Process Namespace Sharing][29] (alpha): Although pods can easily share the Kubernetes namespace, the process, or PID namespace has been a more difficult issue due to lack of support in Docker. This feature enables you to set a parameter on the pod to determine whether containers get their own operating system processes or share a single process. +4. [Add support for Windows Container Configuration in CRI][30] (alpha): The Container Runtime Interface was originally designed with Linux-based containers in mind, and it was impossible to implement support for Windows-based containers using CRI. This feature solves that problem, making it possible to specify a WindowsContainerConfig. +5. [Debug Containers][31] (alpha): It's easy to debug a container if you have the appropriate utilities. But what if you don't? This feature makes it possible to run debugging tools on a container even if those tools weren't included in the original container image. + +### Other changes: + +1. Deployment (SIG-Cluster Lifecycle): [Support out-of-process and out-of-tree cloud providers][32] (beta): As Kubernetes gains acceptance, more and more cloud providers will want to make it available. To do that more easily, the community is working on extracting provider-specific binaries so that they can be more easily replaced. +2. Kubernetes on Azure (SIG-Azure): Kubernetes has a cluster-autoscaler that automatically adds nodes to your cluster if you're running too many workloads, but until now it wasn't available on Azure. The [Add Azure support to cluster-autoscaler][33] (alpha) feature aims to fix that. Closely related, the [Add support for Azure Virtual Machine Scale Sets][34] (alpha) feature makes use of Azure's own autoscaling capabilities to make resources available. +You can download the Kubernetes 1.10 beta from . Again, if you've got feedback (and the community hopes you do) please add an issue to the [1.10 milestone][2] and tag the relevant SIG before March 9. +_ +(Many thanks to community members Michelle Au, Jan Šafránek, Eric Chiang, Michał Nasiadka, Radosław Pieczonka, Xing Yang, Daniel Smith, sylvain boily, Leo Sunmo, Michal Masłowski, Fernando Ripoll, ayodele abejide, Brett Kochendorfer, Andrew Randall, Casey Davenport, Duffie Cooley, Bryan Venteicher, Mark Ayers, Christopher Luciano, and Sandor Szuecs for their invaluable help in reviewing this article for accuracy.)_ + +[1]: https://www.mirantis.com/ +[2]: https://github.com/kubernetes/kubernetes/milestone/37 +[3]: https://github.com/kubernetes/features/issues/43 +[4]: https://github.com/kubernetes/features/issues/5 +[5]: https://github.com/kubernetes/features/issues/279 +[6]: https://github.com/kubernetes/features/issues/541 +[7]: https://github.com/kubernetes/features/issues/542 +[8]: https://github.com/kubernetes/features/issues/504 +[9]: https://github.com/kubernetes/features/issues/427 +[10]: https://github.com/kubernetes/features/issues/536 +[11]: https://github.com/kubernetes/features/issues/539 +[12]: https://github.com/kubernetes/features/issues/263 +[13]: https://github.com/kubernetes/features/issues/515 +[14]: https://github.com/kubernetes/features/issues/516 +[15]: https://github.com/kubernetes/features/issues/496 +[16]: https://docs.google.com/document/d/1Fh0T60T_y888LsRwC51CQHO75b2IZ3A34ZQS71s_F0g/edit#heading=h.ys6pjpbasqdu +[17]: https://github.com/kubernetes/features/issues/432 +[18]: https://github.com/kubernetes/features/issues/361 +[19]: https://github.com/kubernetes/features/issues/178 +[20]: https://github.com/kubernetes/features/issues/121 +[21]: https://github.com/kubernetes/features/issues/498 +[22]: https://github.com/kubernetes/features/issues/499 +[23]: https://github.com/kubernetes/features/issues/531 +[24]: https://github.com/kubernetes/features/issues/304 +[25]: http://leebriggs.co.uk/blog/2017/03/12/kubernetes-flexvolumes.html +[26]: https://github.com/kubernetes/features/issues/490 +[27]: https://github.com/kubernetes/features/issues/281 +[28]: https://github.com/kubernetes/features/issues/292 +[29]: https://github.com/kubernetes/features/issues/495 +[30]: https://github.com/kubernetes/features/issues/547 +[31]: https://github.com/kubernetes/features/issues/277 +[32]: https://github.com/kubernetes/features/issues/88 +[33]: https://github.com/kubernetes/features/issues/514 +[34]: https://github.com/kubernetes/features/issues/513 diff --git a/blog/_posts/2018-03-06-Apache-Spark-23-with-Native-Kubernetes-Support.md b/blog/_posts/2018-03-06-Apache-Spark-23-with-Native-Kubernetes-Support.md new file mode 100644 index 0000000000000..be434d22e78f5 --- /dev/null +++ b/blog/_posts/2018-03-06-Apache-Spark-23-with-Native-Kubernetes-Support.md @@ -0,0 +1,111 @@ +--- +layout: blog +title: "Apache Spark 2.3 with Native Kubernetes Support" +date: Tuesday, March 6, 2018 +--- +### Kubernetes and Big Data + +The open source community has been working over the past year to enable first-class support for data processing, data analytics and machine learning workloads in Kubernetes. New extensibility features in Kubernetes, such as [custom resources][1] and [custom controllers][2], can be used to create deep integrations with individual applications and frameworks. + +Traditionally, data processing workloads have been run in dedicated setups like the YARN/Hadoop stack. However, unifying the control plane for all workloads on Kubernetes simplifies cluster management and can improve resource utilization. + +"Bloomberg has invested heavily in machine learning and NLP to give our clients a competitive edge when it comes to the news and financial information that powers their investment decisions. By building our Data Science Platform on top of Kubernetes, we're making state-of-the-art data science tools like Spark, TensorFlow, and our sizable GPU footprint accessible to the company's 5,000+ software engineers in a consistent, easy-to-use way." - Steven Bower, Team Lead, Search and Data Science Infrastructure at Bloomberg + +### Introducing Apache Spark + Kubernetes + +[Apache Spark 2.3][3] with native Kubernetes support combines the best of the two prominent open source projects — Apache Spark, a framework for large-scale data processing; and Kubernetes. + +Apache Spark is an essential tool for data scientists, offering a robust platform for a variety of applications ranging from large scale data transformation to analytics to machine learning. Data scientists are adopting containers en masse to improve their workflows by realizing benefits such as packaging of dependencies and creating reproducible artifacts. Given that Kubernetes is the de facto standard for managing containerized environments, it is a natural fit to have support for Kubernetes APIs within Spark. + +Starting with Spark 2.3, users can run Spark workloads in an existing Kubernetes 1.7+ cluster and take advantage of Apache Spark's ability to manage distributed data processing tasks. Apache Spark workloads can make direct use of Kubernetes clusters for multi-tenancy and sharing through [Namespaces][4] and [Quotas][5], as well as administrative features such as [Pluggable Authorization][6] and [Logging][7]. Best of all, it requires no changes or new installations on your Kubernetes cluster; simply [create a container image][8] and set up the right [RBAC roles][9] for your Spark Application and you're all set. + +Concretely, a native Spark Application in Kubernetes acts as a [custom controller][2], which creates Kubernetes resources in response to requests made by the Spark scheduler. In contrast with [deploying Apache Spark in Standalone Mode][10] in Kubernetes, the native approach offers fine-grained management of Spark Applications, improved elasticity, and seamless integration with logging and monitoring solutions. The community is also exploring advanced use cases such as managing streaming workloads and leveraging service meshes like [Istio][11]. + +![][12] + +To try this yourself on a Kubernetes cluster, simply download the binaries for the official [Apache Spark 2.3 release][13]. For example, below, we describe running a simple Spark application to compute the mathematical constant Pi across three Spark executors, each running in a separate pod. Please note that this requires a cluster running Kubernetes 1.7 or above, a [kubectl][14] client that is configured to access it, and the necessary [RBAC rules][9] for the default namespace and service account. + + + +``` +$ kubectl cluster-info + +Kubernetes master is running at https://xx.yy.zz.ww + +$ bin/spark-submit + + --master k8s://https://xx.yy.zz.ww + + --deploy-mode cluster + + --name spark-pi + + --class org.apache.spark.examples.SparkPi + + --conf spark.executor.instances=5 + + --conf spark.kubernetes.container.image= + + --conf spark.kubernetes.driver.pod.name=spark-pi-driver + + local:///opt/spark/examples/jars/spark-examples_2.11-2.3.0.jar + + ``` + +To watch Spark resources that are created on the cluster, you can use the following kubectl command in a separate terminal window. + + + +``` +$ kubectl get pods -l 'spark-role in (driver, executor)' -w + +NAME READY STATUS RESTARTS AGE + +spark-pi-driver 1/1 Running 0 14s + +spark-pi-da1968a859653d6bab93f8e6503935f2-exec-1 0/1 Pending 0 0s + +``` + + +The results can be streamed during job execution by running: + + + +``` + +$ kubectl logs -f spark-pi-driver + +``` + +When the application completes, you should see the computed value of Pi in the driver logs. + +In Spark 2.3, we're starting with support for Spark applications written in Java and Scala with support for resource localization from a variety of data sources including HTTP, GCS, HDFS, and more. We have also paid close attention to failure and recovery semantics for Spark executors to provide a strong foundation to build upon in the future. Get started with [the open-source documentation][15] today. + +### Get Involved + +There's lots of exciting work to be done in the near future. We're actively working on features such as dynamic resource allocation, in-cluster staging of dependencies, support for PySpark & SparkR, support for Kerberized HDFS clusters, as well as client-mode and popular notebooks' interactive execution environments. For people who fell in love with the Kubernetes way of managing applications declaratively, we've also been working on a [Kubernetes Operator][16] for spark-submit, which allows users to declaratively specify and submit Spark Applications. + +And we're just getting started! We would love for you to get involved and help us evolve the project further. + +Huge thanks to the Apache Spark and Kubernetes contributors spread across multiple organizations who spent many hundreds of hours working on this effort. We look forward to seeing more of you contribute to the project and help it evolve further. + +Anirudh Ramanathan and Palak Bhatia +Google + +[1]: https://kubernetes.io/docs/concepts/api-extension/custom-resources/ +[2]: https://kubernetes.io/docs/concepts/api-extension/custom-resources/#custom-controllers +[3]: http://spark.apache.org/releases/spark-release-2-3-0.html +[4]: https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/ +[5]: https://kubernetes.io/docs/concepts/policy/resource-quotas/ +[6]: https://kubernetes.io/docs/admin/authorization/ +[7]: https://kubernetes.io/docs/concepts/cluster-administration/logging/ +[8]: https://spark.apache.org/docs/latest/running-on-kubernetes.html#docker-images +[9]: https://spark.apache.org/docs/latest/running-on-kubernetes.html#rbac +[10]: http://blog.kubernetes.io/2016/03/using-Spark-and-Zeppelin-to-process-Big-Data-on-Kubernetes.html +[11]: https://istio.io/ +[12]: https://1.bp.blogspot.com/-hl4pnOqiH4M/Wp4w9QmzghI/AAAAAAAAAL4/jcWoDOKEp3Y6lCzGxzTOlbvl2Mq1-2YeQCK4BGAYYCw/s1600/Screen%2BShot%2B2018-03-05%2Bat%2B10.10.14%2BPM.png +[13]: https://spark.apache.org/downloads.html +[14]: https://kubernetes.io/docs/tasks/tools/install-kubectl/ +[15]: https://spark.apache.org/docs/latest/running-on-kubernetes.html +[16]: https://coreos.com/operators/ diff --git a/blog/_posts/2018-03-13-How-to-Integrate-RollingUpdate-Stategy-for-TPR-in-Kubernetes.md b/blog/_posts/2018-03-13-How-to-Integrate-RollingUpdate-Stategy-for-TPR-in-Kubernetes.md new file mode 100644 index 0000000000000..37e9f7e273e01 --- /dev/null +++ b/blog/_posts/2018-03-13-How-to-Integrate-RollingUpdate-Stategy-for-TPR-in-Kubernetes.md @@ -0,0 +1,250 @@ +--- +layout: blog +title: "How to Integrate RollingUpdate Strategy for TPR in Kubernetes" +date: Tuesday, March 13, 2018 +--- + +With Kubernetes, it's easy to manage and scale stateless applications like web apps and API services right out of the box. To date, almost all of the talks about Kubernetes has been about microservices and stateless applications. + +With the popularity of container-based microservice architectures, there is a strong need to deploy and manage RDBMS(Relational Database Management Systems). RDBMS requires experienced database-specific knowledge to correctly scale, upgrade, and re-configure while protecting against data loss or unavailability. + +For example, MySQL (the most popular open source RDBMS) needs to store data in files that are persistent and exclusive to each MySQL database's storage. Each MySQL database needs to be individually distinct, another, more complex is in cluster that need to distinguish one MySQL database from a cluster as a different role, such as master, slave, or shard. High availability and zero data loss are also hard to accomplish when replacing database nodes on failed machines. + +Using powerful Kubernetes API extension mechanisms, we can encode RDBMS domain knowledge into software, named WQ-RDS, running atop Kubernetes like built-in resources. + +WQ-RDS leverages Kubernetes primitive resources and controllers, it deliveries a number of enterprise-grade features and brings a significantly reliable way to automate time-consuming operational tasks like database setup, patching backups, and setting up high availability clusters. WQ-RDS supports mainstream versions of Oracle and MySQL (both compatible with MariaDB). + +Let's demonstrate how to manage a MySQL sharding cluster. + +### MySQL Sharding Cluster + +MySQL Sharding Cluster is a scale-out database architecture. Based on the hash algorithm, the architecture distributes data across all the shards of the cluster. Sharding is entirely transparent to clients: Proxy is able to connect to any Shards in the cluster and issue queries to the correct shards directly. + +| ----- | +| ![][1] | +| + +Note: Each shard corresponds to a single MySQL instance. Currently, WQ-RDS supports a maximum of 64 shards. + + | + + +All of the shards are built with Kubernetes Statefulset, Services, Storage Class, configmap, secrets and MySQL. WQ-RDS manages the entire lifecycle of the sharding cluster. Advantages of the sharding cluster are obvious: + +* Scale out queries per second (QPS) and transactions per second (TPS) +* Scale out storage capacity: gain more storage by distributing data to multiple nodes + +### Create a MySQL Sharding Cluster + +Let's create a Kubernetes cluster with 8 shards. + +``` + kubectl create -f mysqlshardingcluster.yaml +``` + +Next, create a MySQL Sharding Cluster including 8 shards. + +* TPR : MysqlCluster and MysqlDatabase + +``` +[root@k8s-master ~]# kubectl get mysqlcluster + + +NAME KIND + +clustershard-c MysqlCluster.v1.mysql.orain.com +``` + +MysqlDatabase from clustershard-c0 to clustershard-c7 belongs to MysqlCluster clustershard-c. + +``` +[root@k8s-master ~]# kubectl get mysqldatabase + +NAME KIND + +clustershard-c0 MysqlDatabase.v1.mysql.orain.com + +clustershard-c1 MysqlDatabase.v1.mysql.orain.com + +clustershard-c2 MysqlDatabase.v1.mysql.orain.com + +clustershard-c3 MysqlDatabase.v1.mysql.orain.com + +clustershard-c4 MysqlDatabase.v1.mysql.orain.com + +clustershard-c5 MysqlDatabase.v1.mysql.orain.com + +clustershard-c6 MysqlDatabase.v1.mysql.orain.com + +clustershard-c7 MysqlDatabase.v1.mysql.orain.com +``` + + +Next, let's look at two main features: high availability and RollingUpdate strategy. + +To demonstrate, we'll start by running sysbench to generate some load on the cluster. In this example, QPS metrics are generated by MySQL export, collected by Prometheus, and visualized in Grafana. + +### Feature: high availability + +WQ-RDS handles MySQL instance crashes while protecting against data loss. + +When killing clustershard-c0, WQ-RDS will detect that clustershard-c0 is unavailable and replace clustershard-c0 on failed machine, taking about 35 seconds on average. + +![][2] + +zero data loss at same time. + +![][3] + + +### Feature : RollingUpdate Strategy + +MySQL Sharding Cluster brings us not only strong scalability but also some level of maintenance complexity. For example, when updating a MySQL configuration like innodb_buffer_pool_size, a DBA has to perform a number of steps: + +1\. Apply change time. +2\. Disable client access to database proxies. +3\. Start a rolling upgrade. + + +Rolling upgrades need to proceed in order and are the most demanding step of the process. One cannot continue a rolling upgrade until and unless previous updates to MySQL instances are running and ready. + +4 Verify the cluster. +5\. Enable client access to database proxies. + +Possible problems with a rolling upgrade include: + +* node reboot +* MySQL instances restart +* human error +Instead, WQ-RDS enables a DBA to perform rolling upgrades automatically. + +### StatefulSet RollingUpdate in Kubernetes + +Kubernetes 1.7 includes a major feature that adds automated updates to StatefulSets and supports a range of update strategies including rolling updates. + +**Note:** For more information about [StatefulSet RollingUpdate][4], see the Kubernetes docs. + +Because TPR (currently CRD) does not support the rolling upgrade strategy, we needed to integrate the RollingUpdate strategy into WQ-RDS. Fortunately, the [Kubernetes repo][5] is a treasure for learning. In the process of implementation, there are some points to share: + +* **MySQL Sharding Cluster has ****changed**: Each StatefulSet has its corresponding ControllerRevision, which records all the revision data and order (like git). Whenever StatefulSet is syncing, StatefulSet Controller will firstly compare it's spec to the latest corresponding ControllerRevision data (similar to git diff). If changed, a new ControllerrRevision will be generated, and the revision number will be incremented by 1. WQ-RDS borrows the process, MySQL Sharding Cluster object will record all the revision and order in ControllerRevision. +* **How to initialize MySQL Sharding Cluster to meet request ****replicas**: Statefulset supports two [Pod management policies][4]: Parallel and OrderedReady. Because MySQL Sharding Cluster doesn't require ordered creation for its initial processes, we use the Parallel policy to accelerate the initialization of the cluster. +* **How to perform a Rolling ****Upgrade**: Statefulset recreates pods in strictly decreasing order. The difference is that WQ-RDS updates shards instead of recreating them, as shown below: +![][6] + +* **When RollingUpdate ends**: Kubernetes signals termination clearly. A rolling update completes when all of a set's Pods have been updated to the updateRevision. The status's currentRevision is set to updateRevision and its updateRevision is set to the empty string. The status's currentReplicas is set to updateReplicas and its updateReplicas are set to 0. + +### Controller revision in WQ-RDS + +Revision information is stored in MysqlCluster.Status and is no different than Statefulset.Status. + +``` + +root@k8s-master ~]# kubectl get mysqlcluster -o yaml clustershard-c + +apiVersion: v1 + +items: + +\- apiVersion: mysql.orain.com/v1 + + kind: MysqlCluster + + metadata: + + creationTimestamp: 2017-10-20T08:19:41Z + + labels: + + AppName: clustershard-crm + + Createdby: orain.com + + DBType: MySQL + + name: clustershard-c + + namespace: default + + resourceVersion: "415852" + + selfLink: /apis/mysql.orain.com/v1/namespaces/default/mysqlclusters/clustershard-c + + uid: 6bb089bb-b56f-11e7-ae02-525400e717a6 + + spec: + + + + dbresourcespec: + + limitedcpu: 1200m + + limitedmemory: 400Mi + + requestcpu: 1000m + + requestmemory: 400Mi + + + + status: + + currentReplicas: 8 + + currentRevision: clustershard-c-648d878965 + + replicas: 8 + + updateRevision: clustershard-c-648d878965 + +kind: List + +``` + +### Example: Perform a rolling upgrade + +Finally, We can now update "clustershard-c" to update configuration "innodb_buffer_pool_size" from 6GB to 7GB and reboot. + +The process takes 480 seconds. + +![][7] + +The upgrade is in monotonically decreasing manner: + +![][8] + +![][9] + +![][10] + +![][11] + +![][12] + +![][13] + +![][14] + +![][15] + +### Conclusion + +RollingUpgrade is meaningful to database administrators. It provides a more effective way to operator database. + +\--Orain Xiong, co-founder, Woqutech + +[1]: https://lh5.googleusercontent.com/4WiSkxX-XBqARVqQ0No-1tZ31op90LAUkTco3FdIO1mFScNOTVtMCgnjaO8SRUmms-6MAb46CzxlXDhLBqAAAmbx26atJnu4t1FTTALZx_CbUPqrCxjL746DW4TD42-03Ac9VB2c +[2]: https://lh3.googleusercontent.com/sXqVqfTu6rMWn0mlHLgHHqATe_qsx1tNmMfX60HoTwyhd5HCL4A_ViFBQAZfOoVGioeXcI_XXbzVFUdq2hbKGwS0OXH6PFGqgpZshfBwrT088bz4KqeyTbHpQR2olyzE6eRo1fan +[3]: https://lh6.googleusercontent.com/7xnN_sODa-3Ch3ScAUlggCTeYfnE3-wxRaCIHrljHCB7LnXgth8zeCv0gk_UU1jbSDBQuACQ2Mf1FO1-E7GvMWwGKjp7irenAKp4DkHlA5LR9OVuLXqubPFhhksA8kfBUh4Z4OuN +[4]: https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/#rolling-updates +[5]: https://github.com/kubernetes/kubernetes +[6]: https://lh6.googleusercontent.com/B4ig8krCsXwvMeBy8NamQi1DrihUEzBcRTHCqhn9kUvlcpPrFoYUNAxn61qh8S2HXcdg31QpOhWSsYHP0jI4QxPkKpZ5oY-k9gFp1eK63qt6rwTMMWMiBs45DObY6rw2R7c0lNPu +[7]: https://lh4.googleusercontent.com/LOxFDdojYxnPvSHDYwivVge6vGImK7uTdyvCsKrxCMF3rIlVkw7mHeNhJiNJwz1aGzVhZXpqrgzHC6pIbkPk3JPAtuSqX9ovAYBzK01BGfzwkXvMGZomAh4L0DahGyD3QB715B-Z +[8]: https://lh6.googleusercontent.com/DhFbY3JDh23A_91c04TujxWM9xCX_xq1xOCXHi7XAd75LzKwDtbH6Gr_2VXCscg8AeVCQzw3Inw4M-uvssWq8od4va0wd-fIyClVY63FjRfeU16fQda_XqzBYRIhrG5W3tDnCAwC +[9]: https://lh6.googleusercontent.com/bAJtLRRl2TqQrfBOooNm9DIEuezoBhT3f-XuOyGxp8sKePzfRaQYcJ7PFvL30xw9jeUpc-3rVw6Qjr46dFRk7mmUsf3oichNEuC-BFwCEtpbxK0_BjSJxtIE4B5xR4CGw1m6Hf0D +[10]: https://lh4.googleusercontent.com/ALYk-EP_rYibA95nIIo8TKx8BYuSY9w1Pqw4JLEiV89K9i06uBhkTrYWX26FjYtheGKVwwVMTtDKH7UTBovGf8AEpK97T3RT23RSAUTs4GyDFaDOGmlRAczbGLm0UjQglbB_NPdF +[11]: https://lh4.googleusercontent.com/gmM6UbgVOBWPJBpIMutxeTxGiwtjFv25KAHQw3ebVAF5Kxm-uxkPKEiYKhpwYUTyDe5knYlGmQDDHiN8eefBJx0fbK7jg4IlpG5_DXMUG6rNNFIbpP7Q94ANROIeUfe5JP6t-k37 +[12]: https://lh5.googleusercontent.com/aiczeqRNRls8lh-LYbnx112kgZI2gvaBMimAk74KlLhR3EVicuKAemTKr2eKUSFPjmKbsg_gw_nY1G4YU0-3J1EjDPOhz55UUri47Py-s-jRf0dF-lAKn6TRrF6IvGtv2aldWa3k +[13]: https://lh6.googleusercontent.com/mwRQP_wXMCzpXsC5sqb0nJ9jU4KdUl4FiUE26gQZMQbrn5zcgqSYZB03CLmGsT2Nuq-7x00W4Ar3IUAh7hxEksQEGl6ugAmY0wo7xjzisNH9VE1qto9Afx8QW2Sr6NR-SBDeJfTt +[14]: https://lh6.googleusercontent.com/joraaJ-qX-K8zTdAFBJWeOswQQtNeX6yezKGkSM56FNYQT-XYrgsxvNLYBE0askw9huAmJhebCVU4AMvjz4B6xlIjdLwO3vMX7_dWBzkfu05HZ3-NOsFnqg-jvkLknl-ldRzUcFO +[15]: https://lh5.googleusercontent.com/ayoUAhD-azUjUqjut7iSiW8FBFJpCJZLRJDT9mXJoy4QTutAsGgr4yPvbFumaXasOqpsmJ_zZ2k7nrQl2YrjGqPr83PXe-tXjj9OLc-GYhhtJTzBEeddWpZn5pDyBpdw9I4sD-O0 diff --git a/blog/_posts/2018-03-14-Expanding-User-Support-with-Office-Hours.md b/blog/_posts/2018-03-14-Expanding-User-Support-with-Office-Hours.md new file mode 100644 index 0000000000000..cbae86a36bc43 --- /dev/null +++ b/blog/_posts/2018-03-14-Expanding-User-Support-with-Office-Hours.md @@ -0,0 +1,43 @@ +--- +layout: blog +title: "Expanding User Support with Office Hours" +date: Wednesday, March 14, 2018 +pagination: + enabled: true +--- + +**Today's post is by Jorge Castro and Ilya Dmitichenko on Kubernetes office hours.** + +Today's developer has an almost overwhelming amount of resources available for learning. Kubernetes development teams use [StackOverflow][1], [user documentation][2], [Slack][3], and the [mailing lists][4]. Additionally, the community itself continues to amass an [awesome list][5] of resources. + +One of the challenges of large projects is keeping user resources relevant and useful. While documentation can be useful, great learning also happens in Q&A sessions at conferences, or by learning with someone whose explanation matches your learning style. Consider that learning Kung Fu from Morpheus would be a lot more fun than reading a book about Kung Fu! + +![][6] + + +We as Kubernetes developers want to create an interactive experience: where Kubernetes users can get their questions answered by experts in real time, or at least referred to the best known documentation or code example. + +Having discussed a few broad ideas, we eventually decided to make [Kubernetes Office Hours][7] a live stream where we take user questions from the audience and present them to our panel of contributors and expert users. We run two sessions: one for European time zones, and one for the Americas. These [streaming setup guidelines][8] make office hours extensible—for example, if someone wants to run office hours for Asia/Pacific timezones, or for another CNCF project. + +To give you an idea of what Kubernetes office hours are like, here's Josh Berkus answering a question on running databases on Kubernetes. Despite the popularity of this topic, it's still difficult for a new user to get a constructive answer. Here's an excellent response from Josh: + +[![](https://img.youtube.com/vi/Aj0yozuQ0ME/0.jpg)](https://www.youtube.com/embed/Aj0yozuQ0ME?ecver=2) + +It's often easier to field this kind of question in office hours than it is to ask a developer to write a full-length blog post. \[Editor's note: That's legit!\] Because we don't have infinite developers with infinite time, this kind of focused communication creates high-bandwidth help while limiting developer commitments to 1 hour per month. This allows a rotating set of experts to share the load without overwhelming any one person. + +We hold office hours the third Wednesday of every month on the [Kubernetes YouTube Channel][9]. You can post questions on the [#office-hours channel][10] on Slack, or you can submit your question to Stack Overflow and post a link on Slack. If you post a question in advance, you might get better answers, as volunteers have more time to research and prepare. If a question can't be fully solved during the call, the team will try their best to point you in the right direction and/or ping other people in the community to take a look. [Check out this page][7] for more details on what's off- and on topic as well as meeting information for your time zone. We hope to hear your questions soon! + +Special thanks to Amazon, Bitnami, Giant Swarm, Heptio, Liquidweb, Northwestern Mutual, Packet.net, Pivotal, Red Hat, Weaveworks, and VMWare for donating engineering time to office hours. + +And thanks to Alan Pope, Joe Beda, and Charles Butler for technical support in making our livestream better. + +[1]: https://stackoverflow.com/questions/tagged/kubernetes +[2]: https://kubernetes.io/docs/home +[3]: http://slack.k8s.io/ +[4]: https://groups.google.com/forum/#!forum/kubernetes-users +[5]: https://github.com/ramitsurana/awesome-kubernetes +[6]: https://3.bp.blogspot.com/-Iy2GaddJp78/WqnFbVUu9FI/AAAAAAAAAM4/xUzhOSIlRDEMMZNl3SzPBd1Pa0T5y0pKQCLcBGAs/s400/24xkey.jpg +[7]: https://github.com/kubernetes/community/blob/master/events/office-hours.md +[8]: https://docs.google.com/document/d/1jHSnRzoOxwd1urgxwbANhNgXjMV8fb0B4NS3ZUL10IY/edit +[9]: https://www.youtube.com/c/kubernetescommunity +[10]: https://kubernetes.slack.com/messages/office-hours diff --git a/blog/_posts/2018-03-15-Principles-of-Container-based-Application-Design.md b/blog/_posts/2018-03-15-Principles-of-Container-based-Application-Design.md new file mode 100644 index 0000000000000..e21701b6e9df4 --- /dev/null +++ b/blog/_posts/2018-03-15-Principles-of-Container-based-Application-Design.md @@ -0,0 +1,49 @@ +--- +layout: blog +title: "Principles of Container-based Application Design" +date: Thursday, March 15, 2018 +--- + +It's possible nowadays to put almost any application in a container and run it. Creating cloud-native applications, however—containerized applications that are automated and orchestrated effectively by a cloud-native platform such as Kubernetes—requires additional effort. Cloud-native applications anticipate failure; they run and scale reliably even when their infrastructure experiences outages. To offer such capabilities, cloud-native platforms like Kubernetes impose a set of contracts and constraints on applications. These contracts ensure that applications they run conform to certain constraints and allow the platform to automate application management. + +I've outlined [seven principles][1] for containerized applications to follow in order to be fully cloud-native. + +| ----- | +| ![][2] | +| Container Design Principles | + + +These seven principles cover both build time and runtime concerns. + +#### Build time + +* **Single Concern:** Each container addresses a single concern and does it well. +* **Self-Containment:** A container relies only on the presence of the Linux kernel. Additional libraries are added when the container is built. +* **Image Immutability:** Containerized applications are meant to be immutable, and once built are not expected to change between different environments. + +#### Runtime + +* **High Observability:** Every container must implement all necessary APIs to help the platform observe and manage the application in the best way possible. +* **Lifecycle Conformance:** A container must have a way to read events coming from the platform and conform by reacting to those events. +* **Process Disposability:** Containerized applications must be as ephemeral as possible and ready to be replaced by another container instance at any point in time. +* **Runtime Confinement:** Every container must declare its resource requirements and restrict resource use to the requirements indicated. +The build time principles ensure that containers have the right granularity, consistency, and structure in place. The runtime principles dictate what functionalities must be implemented in order for containerized applications to possess cloud-native function. Adhering to these principles helps ensure that your applications are suitable for automation in Kubernetes. + +The white paper is freely available for download: + + +To read more about designing cloud-native applications for Kubernetes, check out my [Kubernetes Patterns][3] book. + +— [Bilgin Ibryam][4], Principal Architect, Red Hat + +Twitter: 
 +Blog: [http://www.ofbizian.com][5] +Linkedin: + +Bilgin Ibryam (@bibryam) is a principal architect at Red Hat, open source committer at ASF, blogger, author, and speaker. He is the author of Camel Design Patterns and Kubernetes Patterns books. In his day-to-day job, Bilgin enjoys mentoring, training and leading teams to be successful with distributed systems, microservices, containers, and cloud-native applications in general. + +[1]: https://www.redhat.com/en/resources/cloud-native-container-design-whitepaper +[2]: https://lh5.googleusercontent.com/1XqojkVC0CET1yKCJqZ3-0VWxJ3W8Q74zPLlqnn6eHSJsjHOiBTB7EGUX5o_BOKumgfkxVdgBeLyoyMfMIXwVm9p2QXkq_RRy2mDJG1qEExJDculYL5PciYcWfPAKxF2-DGIdiLw +[3]: http://leanpub.com/k8spatterns/ +[4]: http://twitter.com/bibryam +[5]: http://www.ofbizian.com/ diff --git a/css/blog.css b/css/blog.css index c1e0d22e4fd54..b51c4ad541d1d 100644 --- a/css/blog.css +++ b/css/blog.css @@ -261,7 +261,7 @@ h3.post-title{ font-size: 90%; } -/* Mobile +/* Mobile/ ----------------------------------------------- */ .main-inner .column-right-outer { width: 320px; @@ -284,17 +284,7 @@ h3.post-title{ white-space: nowrap; font-family: Roboto, sans-serif; } -.widget-link .fa { - position: absolute; - left: 0; top: 0; - width: 40px; height: 40px; - color: white; - background-color: #326DE6; - border-radius: 6px; - font-size: 30px; - text-align: center; - line-height: 40px; -} + h2.date-header { font-family: Roboto-Bold; font-weight: bold; @@ -407,7 +397,7 @@ ul { } /* Sidebar Icon Styles */ .widget-link svg { - font-size: 48px; + font-size: 33px; color:#326DE6; }