[Federation] Document simplified federation control plane deployment via kubefed. #1822
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cc @kubernetes/docs |
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| Kubernetes v1.5 introduced a new command line tool called `kubefed` | ||
| to facilitate the administration of cluster federations. `kubefed` | ||
| stands for "Kubernetes Federate". It aids in both deploying a |
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I thought it stood for "Kubernetes Federation" :)
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@nikhiljindal we wanted to choose a verb, like kubectl = "Kubernetes Control".
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The sentence is probably not necessary anyway.
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I took a quick look and looks good to me. |
| in your `$PATH` and set the executable permission on those binaries. | ||
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| ```shell | ||
| curl -O https://storage.googleapis.com/kubernetes-release/release/v1.5.0/kubernetes-client-linux-amd64.tar.gz |
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This path doesn't exist yet. Are you sure that 1.5 will be released in this path?
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@mwielgus yeah, I am pretty sure. A good test is replacing v1.5.0 with v1.4.0.
| teach the federation control plane about a cluster by joining that | ||
| cluster to the federation. | ||
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| Joining a cluster to a federation is as simple as running: |
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You use "as simple as running" at the beginning of the previous subchapter. Please use a different linguistic construction :).
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Done.
I thought, it would be consistent. But I see your point. Consistency in natural language writing is boring. Need variations. Changed here, but left another instance further below.
| cases, you could specify a cluster name that conforms to the RFC 1035 | ||
| label naming rules and specify the cluster context using the | ||
| `--cluster-context` flag. For example, if context of the cluster your | ||
| are joining is `gondor_has_no_king-gondor_needs_no_king`, then you can |
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can we have a simpler context name, please?
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@mwielgus the length was intentional, to mimic some cluster names although in a slightly cheesy way.
Cut the length in half.
| However, the name of a secret object in Kubernetes should conform | ||
| to the subdomain name specification described in RFC 1123. If this isn't case, you can pass the secret name to `kubefed join` using the | ||
| `--secret-name` flag. For example, if the cluster name is `noldor` and | ||
| the secret name is `11kingdom`, you can join the cluster by running: |
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Can we name the secret for noldor as noldor-secret?
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That won't demonstrate a valid secret name but an invalid cluster name. The difference are the numbers in the front.
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Just couple nits. Feel free to apply the label once fixed. |
| cases, you could specify a cluster name that conforms to the RFC 1035 | ||
| label naming rules and specify the cluster context using the | ||
| `--cluster-context` flag. For example, if context of the cluster your | ||
| are joining is `gondor_has_no_king-gondor_needs_no_king`, then you can |
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@mwielgus the length was intentional, to mimic some cluster names although in a slightly cheesy way.
Cut the length in half.
| teach the federation control plane about a cluster by joining that | ||
| cluster to the federation. | ||
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| Joining a cluster to a federation is as simple as running: |
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Done.
I thought, it would be consistent. But I see your point. Consistency in natural language writing is boring. Need variations. Changed here, but left another instance further below.
| However, the name of a secret object in Kubernetes should conform | ||
| to the subdomain name specification described in RFC 1123. If this isn't case, you can pass the secret name to `kubefed join` using the | ||
| `--secret-name` flag. For example, if the cluster name is `noldor` and | ||
| the secret name is `11kingdom`, you can join the cluster by running: |
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That won't demonstrate a valid secret name but an invalid cluster name. The difference are the numbers in the front.
Oops, seeing this now. Adding the label. |
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| Kubernetes v1.5 introduced a new command line tool called `kubefed` |
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Avoid ast tense.
"Kubernetes version 1.5 includes a new command line tool..."
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| --- | ||
| Kubernetes v1.5 introduced a new command line tool called `kubefed` | ||
| to facilitate the administration of cluster federations. `kubefed` |
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"to facilitate the adminstration of cluster federations" -> "to help you administrate your federated clusters."
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@devin-donnelly is it right to say "to help you administrate your federation"? I don't want to say "federated clusters" because what they are managing is a federation control plane which is an entity in itself.
| --- | ||
| Kubernetes v1.5 introduced a new command line tool called `kubefed` | ||
| to facilitate the administration of cluster federations. `kubefed` | ||
| stands for "Kubernetes Federate". It aids in both deploying a |
There was a problem hiding this comment.
The sentence is probably not necessary anyway.
| Kubernetes v1.5 introduced a new command line tool called `kubefed` | ||
| to facilitate the administration of cluster federations. `kubefed` | ||
| stands for "Kubernetes Federate". It aids in both deploying a | ||
| Kubernetes Cluster Federation control plane and adding/removing |
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"kubefed helps you to deploy a new Kubernetes cluster federation control plane, and to add clusters to or remove clusters from an existing federation control plane."
| This guide explains how to administer a Kubernetes Cluster Federation | ||
| using `kubefed`. | ||
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| `kubefed` is considered alpha in Kubernetes v1.5. |
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Set this off with a blockquote, like below:
"> Note: kubefed is an alpha feature in Kubernetes 1.5."
| kubfed join noldor --host-cluster-context=rivendell --secret-name=11kingdom | ||
| ``` | ||
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| ## Unjoining a cluster: |
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Removing a cluster from a federation
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| ## Unjoining a cluster: | ||
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| Unjoining a cluster from federation is as simple as running: |
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"To remove a cluster from a federation, run the kubefed unjoin command with the cluster name and the federation's --host-cluster-context:"
| kubfed unjoin gondor --host-cluster-context=rivendell | ||
| ``` | ||
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| where `gondor` is the cluster name you specified while joining the |
| this alpha release of `kubefed`. However, for the time being, deleting | ||
| the federation system namespace should remove all the resources except | ||
| the persistent storage volume dynamically provisioned for the | ||
| federation control plane's etcd. This can be accomplished by running: |
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Y"ou can delete the federation namespace by running the following command:"
| Also, you might not want to delete the storage volume that stores | ||
| the state of your federation control plane. You can then use that | ||
| storage volume to resume your federation control plane. We are | ||
| evaluating various alternatives to handle this case correctly and that's the reason for not implementing federation control plane turn down in this alpha release. |
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Last sentence is unnecessary.
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Removed the whole paragraph.
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@devin-donnelly thank you very much for all the corrections! Incorporated them. PTAL.
| - madhusudancs | ||
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| Kubernetes v1.5 introduced a new command line tool called `kubefed` |
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| --- | ||
| Kubernetes v1.5 introduced a new command line tool called `kubefed` | ||
| to facilitate the administration of cluster federations. `kubefed` |
There was a problem hiding this comment.
@devin-donnelly is it right to say "to help you administrate your federation"? I don't want to say "federated clusters" because what they are managing is a federation control plane which is an entity in itself.
| --- | ||
| Kubernetes v1.5 introduced a new command line tool called `kubefed` | ||
| to facilitate the administration of cluster federations. `kubefed` | ||
| stands for "Kubernetes Federate". It aids in both deploying a |
| Kubernetes v1.5 introduced a new command line tool called `kubefed` | ||
| to facilitate the administration of cluster federations. `kubefed` | ||
| stands for "Kubernetes Federate". It aids in both deploying a | ||
| Kubernetes Cluster Federation control plane and adding/removing |
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| ## Getting `kubefed` | ||
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| Download the Kubernetes client tarball corresponding to a release |
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Mentioned 1.5. PTAL.
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| Cluster name supplied to `kubefed join` must be a valid RFC 1035 label. | ||
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| Furthermore, federation control plane requires credentials of the |
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The problem with this wording is, it doesn't explicitly state that the cluster name in the command is matched to the context name in the kubeconfig. There is also a concept of cluster name in kubeconfig and we need to ensure that people don't get confused about these two.
How do we reword for that?
| local kubeconfig. If it fails to find a matching context, it exits | ||
| with an error. | ||
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| It is particularly a problem in the cases where context names |
| join the cluster by running: | ||
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| ```shell | ||
| kubfed join gondor --host-cluster-context=rivendell --cluster-context=gondor_needs-no_king |
| running: | ||
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| ```shell | ||
| kubfed join noldor --host-cluster-context=rivendell --secret-name=11kingdom |
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Oops again! Thanks!
Fixed.
| Also, you might not want to delete the storage volume that stores | ||
| the state of your federation control plane. You can then use that | ||
| storage volume to resume your federation control plane. We are | ||
| evaluating various alternatives to handle this case correctly and that's the reason for not implementing federation control plane turn down in this alpha release. |
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Removed the whole paragraph.
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| ## Adding a cluster to a federation | ||
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| Once you've deployed a federation control plane, you'll need to make |
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@devin-donnelly after I made the change suggested here - #1822 (comment), I got a comment from a user who is trying this out saying he would have liked some details explaining why he had to do this (add/join a cluster).
Can we still incorporate that somehow?
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Sure. I'd add it as a "note" afterward, like this format:
"> Note: Kubernetes requires that you manually join clusters to a federation control plane because..."
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@devin-donnelly Thanks. Added a note. PTAL.
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Awesome, thanks. This one looks good to go. |
Documentation for kubernetes/enhancements#97.
cc @kubernetes/sig-cluster-federation @nikhiljindal @irfanurrehman @shashidharatd
This change is