Difference between revisions of "Kubernetes Cheat Sheet"
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(Created page with "== Cheatsheet == https://kubernetes.io/docs/reference/kubectl/cheatsheet/ == Run Kubernetes Dashboard == Run this comand from kubernetes master. [root@gejoreuy-kubmas...") |
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| − | + | '''Cheatsheet''' | |
https://kubernetes.io/docs/reference/kubectl/cheatsheet/ | https://kubernetes.io/docs/reference/kubectl/cheatsheet/ | ||
| − | + | '''Run Kubernetes Dashboard''' | |
Run this comand from kubernetes master. | Run this comand from kubernetes master. | ||
| − | + | [root@gejoreuy-kubmaster ~]# kubectl proxy --address 0.0.0.0 | |
| − | + | Starting to serve on [::]:8001 | |
| − | + | ||
Then setup tunnels in Putty from localhost to port 8001. | Then setup tunnels in Putty from localhost to port 8001. | ||
| − | + | '''Leave Kubernetes Master''' | |
Run below command in kubernetes node that want to leave the master. | Run below command in kubernetes node that want to leave the master. | ||
| − | + | [root@gejoreuy-kubnode2 ~]# kubeadm reset | |
| − | + | '''Delete Node''' | |
After some node leave, this node which left has status NotReady in kubernetes master. | After some node leave, this node which left has status NotReady in kubernetes master. | ||
| − | + | [root@gejoreuy-kubmaster ~]# kubectl get nodes | |
| − | + | gejoreuy-kubmaster Ready master 16h v1.17.3 | |
| − | + | gejoreuy-kubnode1 Ready <none> 16h v1.17.3 | |
| − | + | gejoreuy-kubnode2 NotReady <none> 16h v1.17.3 | |
| + | |||
| + | |||
| + | '''Scalling Deployments''' | ||
| + | |||
| + | To scaling up or scalling down deployment services in Kubernetes. | ||
| + | |||
| + | [root@gejoreuy-kubmaster ~]# kubectl -n [namespace] scale --replicas=[replica-count] deployment/[service-name] --insecure-skip-tls-verify=true | ||
| + | |||
| + | |||
| + | '''Check CPU and Memory LImits and Request for Pods''' | ||
| + | |||
| + | Change <node-name> with correct node name. | ||
| + | |||
| + | [root@gejoreuy-kubmaster ~]# kubectl get po -o custom-columns="Node:spec.nodeName,Namespace:metadata.namespace,Name:metadata.name,CPU-limit:spec.containers[*].resources.limits.cpu, CPU-request:spec.containers[*].resources.requests.cpu, memory-limits:spec.containers[*].resources.limits.memory, memory-request:spec.containers[*].resources.requests.memory" -A --sort-by="spec.containers[*].resources.limits.memory" --field-selector=spec.nodeName=<node-name> | ||
| + | |||
| + | '''Get Secret''' | ||
| + | |||
| + | Get secret and decode it from base64 version. | ||
| + | |||
| + | [root@gejoreuy-kubmaster ~]# kubectl -n [namespace] get secret [secretname] -o jsonpath='{.data}' | ||
| + | [root@gejoreuy-kubmaster ~]# echo 'SECRETRESULSECRETRESULTSECRETRESULT' | base64 -d | ||
Latest revision as of 16:12, 29 May 2024
Cheatsheet
https://kubernetes.io/docs/reference/kubectl/cheatsheet/
Run Kubernetes Dashboard
Run this comand from kubernetes master.
[root@gejoreuy-kubmaster ~]# kubectl proxy --address 0.0.0.0 Starting to serve on [::]:8001
Then setup tunnels in Putty from localhost to port 8001.
Leave Kubernetes Master
Run below command in kubernetes node that want to leave the master.
[root@gejoreuy-kubnode2 ~]# kubeadm reset
Delete Node
After some node leave, this node which left has status NotReady in kubernetes master.
[root@gejoreuy-kubmaster ~]# kubectl get nodes gejoreuy-kubmaster Ready master 16h v1.17.3 gejoreuy-kubnode1 Ready <none> 16h v1.17.3 gejoreuy-kubnode2 NotReady <none> 16h v1.17.3
Scalling Deployments
To scaling up or scalling down deployment services in Kubernetes.
[root@gejoreuy-kubmaster ~]# kubectl -n [namespace] scale --replicas=[replica-count] deployment/[service-name] --insecure-skip-tls-verify=true
Check CPU and Memory LImits and Request for Pods
Change <node-name> with correct node name.
[root@gejoreuy-kubmaster ~]# kubectl get po -o custom-columns="Node:spec.nodeName,Namespace:metadata.namespace,Name:metadata.name,CPU-limit:spec.containers[*].resources.limits.cpu, CPU-request:spec.containers[*].resources.requests.cpu, memory-limits:spec.containers[*].resources.limits.memory, memory-request:spec.containers[*].resources.requests.memory" -A --sort-by="spec.containers[*].resources.limits.memory" --field-selector=spec.nodeName=<node-name>
Get Secret
Get secret and decode it from base64 version.
[root@gejoreuy-kubmaster ~]# kubectl -n [namespace] get secret [secretname] -o jsonpath='{.data}'
[root@gejoreuy-kubmaster ~]# echo 'SECRETRESULSECRETRESULTSECRETRESULT' | base64 -d
