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update slides
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@toschneck
toschneck committed Jun 12, 2019
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Expand Up @@ -21,18 +21,20 @@ patat:
```bash
$ kubectl hacking
_ __ _ _
| |/ / _| |__ ___ _ __ _ __ ___| |_ ___ ___
| ' / | | | '_ \ / _ \ '__| '_ \ / _ \ __/ _ \/ __|
| . \ |_| | |_) | __/ | | | | | __/ || __/\__ \
|_|\_\__,_|_.__/ \___|_| |_| |_|\___|\__\___||___/
__ __ _ __ __ _ _
| \/ | ___ ___| |_ _ _ _ __ | \/ |_ _ _ __ (_) ___| |__
| |\/| |/ _ \/ _ \ __| | | | '_ \ | |\/| | | | | '_ \| |/ __| '_ \
| | | | __/ __/ |_| |_| | |_) | | | | | |_| | | | | | (__| | | |
|_| |_|\___|\___|\__|\__,_| .__/ |_| |_|\__,_|_| |_|_|\___|_| |_|
|_|
____ ___ ____
| _ \ _____ __ / _ \ _ __ ___ / ___|___ _ __
| | | |/ _ \ \ / / | | | | '_ \/ __| | | / _ \| '_ \
| |_| | __/\ V / | |_| | |_) \__ \ | |__| (_) | | | |
|____/ \___| \_/ \___/| .__/|___/ \____\___/|_| |_|
|_|
____ _ _
| __ ) ___ _ __| (_)_ __
| _ \ / _ \ '__| | | '_ \
| |_) | __/ | | | | | | |
|____/ \___|_| |_|_|_| |_|
```

Expand Down Expand Up @@ -72,7 +74,7 @@ Java programmer -> Testautomation -> Docker -> OpenShift -> Kubernetes
* Main command line tool for interact with Kubernetes writen in Golang
* Maintained by SIG API Machinery (part of official community)
* Source code: https://github.com/kubernetes/kubernetes/tree/master/pkg/kubectl
* Uses `curl` - check e. g. `kubectl get pod -v 10`
* Uses REST HTTPS calls
* Caches results under `~/.kube/cache/`

* Other clients
Expand All @@ -84,7 +86,10 @@ Java programmer -> Testautomation -> Docker -> OpenShift -> Kubernetes
curl --cert userbob.pem --key userBob-key.pem \
--cacert /path/to/ca.pem \
https://k8sServer:6443/api/v1/pods
```

# as helper use:
kubectl get pod -v 10
```

---

Expand All @@ -98,7 +103,7 @@ Java programmer -> Testautomation -> Docker -> OpenShift -> Kubernetes
complete -F __start_kubectl k
```

* [powerline go](https://github.com/justjanne/powerline-go)
* beautify your bash prompt -> [powerline go](https://github.com/justjanne/powerline-go)
1. Install binary `go get -v -u github.com/justjanne/powerline-go`
2. ensure powerline-go is available in the path: `export PATH=$PATH:$GOPATH/bin`
3. config `~/.bashrc` -> `source ./powerline-go/.bashrc`
Expand Down Expand Up @@ -137,7 +142,7 @@ Java programmer -> Testautomation -> Docker -> OpenShift -> Kubernetes
* useful to manage multiple cluster
* merge multiple config files
```bash
kubectl --kubeconfig=conf1:conf2 config view --flatten > merged.conf
KUBECONFIG=conf1:conf2 kubectl config view --flatten > merged.conf
```

* Configures your current working environment.
Expand Down Expand Up @@ -275,7 +280,7 @@ JSONPATH='{range .items[*]}{"\n---\n"}{@.metadata.name}:{"\n"}{range @.status.co

# Quick wins - let `kubectl` help you!

## use `run` for resource creation
## use `run` for resource creation (deprecated)

* `--image=image` Docker image
* `--env="key=value"` environment variable(s)
Expand All @@ -292,12 +297,33 @@ JSONPATH='{range .items[*]}{"\n---\n"}{@.metadata.name}:{"\n"}{range @.status.co
```
* `run ... -- argument` pass the arguments directly to the container
```bash
# start a simple web image and test it with bussy box s
# start a simple web image and test it with bussy box
kubectl run --image=loodse/demo-www --port 80 web-deployment
kubectl run --image=busybox --restart=Never --rm -it -- bash
# ... inside the conainer: wget $WEB_DEPLOYMENT_SERVICE_HOST -O -
```

------

# Quick wins - let `kubectl` help you!

## new `create` for resource creation

```bash
kubectl create
clusterrole deployment priorityclass secret
clusterrolebinding job quota service
configmap namespace role serviceaccount
cronjob poddisruptionbudget rolebinding
```

* `--image=image` Docker image
* ... less options see `kubectl create OBJECT --help`

Example
```bash
kubectl create deployment web-deployment --image=loodse/demo-www
```
---

# Quick wins - let `kubectl` help you!
Expand Down Expand Up @@ -338,10 +364,11 @@ kubectl get nodes --selector=kubernetes.io/role!=master -o jsonpath={.items[0].s

## create templates

* `--dry-run` combined with `-o yaml` and `--restart` creates a template for common resource
* `--dry-run` combined with `-o yaml` and `run --restart` or `create` creates a template for common resource
```bash
# create a deployment yaml file
kubectl run --image=loodse/demo-www --port 80 --dry-run -o yaml web-template > dep.yaml
kubectl create deployment web-template --image=loodse/demo-www --dry-run -o yaml > dep.yaml
# job with 10 sleep
kubectl run --image=busybox --restart=OnFailure --dry-run -o yaml job -- /bin/sleep 10 > job.yaml
Expand All @@ -357,7 +384,6 @@ k apply -f dep.export.yaml
#service
k get service web-deployment --export -o yaml > svc.export.yaml
```
*Note:* You can use `k apply -f FOLDER` for applying multi manifests!
---
Expand All @@ -367,9 +393,10 @@ k get service web-deployment --export -o yaml > svc.export.yaml
* Use inplace editor functionality
* `KUBE_EDITOR` sets the local editor
* `kubectl edit TYP OBJECTobject` open in cluster resource
* `kubectl edit TYP OBJECT` open in cluster resource
* Use `apply` for mutable objects, `replace` for immutable objects. *Note:* You can use `-f FOLDER` for using multi manifests!
* Use `apply` for mutable objects, `replace` for immutable objects.
```bash
kubectl apply -f dep.yaml
# delete resource and recreates it
Expand All @@ -379,11 +406,21 @@ k get service web-deployment --export -o yaml > svc.export.yaml
* `k autoscale deployment foo --min=2 --max=10` add [HPA](https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/)
* `k scale deployment --replicas=10 web-deployment` scales up
---
# Quick wins - let `kubectl` help you!
## Modify resources
* Manipulate current objects, e.g. the `image` value
```bash
# use set for common modification
k set image deployment/web-deployment web-deployment=loodse/demo-www
# use patch for all other
k set env deployment/web-deployment TEST=val
# use patch for all other, e.g. service type
kubectl patch svc/web-deployment -p '{"spec":{"type":"LoadBalancer"}}'
# Update a container's image; spec.containers[*].name is required because it's a merge key
kubectl patch pod/podname -p \
'{"spec":{"containers":[{"name":"web-deployment","image":"loodse/demo-www"}]}}'
Expand Down Expand Up @@ -488,18 +525,6 @@ kubectl view-secret default-token-976rc namespace
---
# In-Cluster Tools
!= need a running components in the cluster
## [k9s](https://github.com/derailed/k9s)
* provides a curses based terminal UI
## [popeye](https://github.com/derailed/popeye)
* Kubernetes Cluster Sanitizer
* Find errors
---
# Troubleshooting
- Take a look for objects in state `Pending`, `Error`, `CrashLoopBackOff`
Expand Down Expand Up @@ -529,6 +554,20 @@ kubectl view-secret default-token-976rc namespace
---
# Cluster Inspection Tools
++ need no running components in the cluster
## [`k9s`](https://github.com/derailed/k9s)
* provides a curses based terminal UI
* interactive view similar to `htop`
## [`popeye`](https://github.com/derailed/popeye)
* Kubernetes Cluster Sanitizer
* Find errors and warnings
---
# Cluster Management by [Cluster API](https://github.com/kubernetes-sigs/cluster-api)
* Manage Cluster's by CRDs in depedent of the provider (cloud/on-prem)
Expand All @@ -540,7 +579,7 @@ kubectl view-secret default-token-976rc namespace
```bash
# see the machine definition
k describe machine -n kube-system MACHINE_NAME
kubectl get md,ms,ma,node -n kube-system
k get machinedeployment,machineset,machine,node -n kube-system
# update e.g. kubernetes version, machine size, ...
k edit machinedeployment
Expand All @@ -560,15 +599,6 @@ kubectl view-secret default-token-976rc namespace

---

*References:*

* https://kubernetes.io/docs/reference/kubectl/cheatsheet
* https://kubectl.docs.kubernetes.io
* https://medium.com/@nassim.kebbani/how-to-beat-kubernetes-ckad-certification-c84bff8d61b1
* https://www.freecodecamp.org/news/how-to-set-up-a-serious-kubernetes-terminal-dd07cab51cd4

---

# Questions?

> I'm happy to answer!
Expand All @@ -583,5 +613,15 @@ kubectl view-secret default-token-976rc namespace
**Thx for your attention!**
---
*References:*
* https://kubernetes.io/docs/reference/kubectl/cheatsheet
* https://kubectl.docs.kubernetes.io
* https://medium.com/@nassim.kebbani/how-to-beat-kubernetes-ckad-certification-c84bff8d61b1
* https://www.freecodecamp.org/news/how-to-set-up-a-serious-kubernetes-terminal-dd07cab51cd4
---

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