mirror of
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180 lines
3.2 KiB
Markdown
180 lines
3.2 KiB
Markdown
# Kubernetes
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* PDF: https://sematext.com/kubernetes-cheat-sheet/
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* WEBSITE: https://kubernetes.io/
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* DOCUMENTATION: https://kubernetes.io/docs/home
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## Client Configuration
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* Setup autocomplete in bash; bash-completion package should be installed first
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```
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source <(kubectl completion bash)
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```
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* View Kubernetes config
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```
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kubectl config view
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```
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* View specific config items by json path
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```
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kubectl config view -o jsonpath='{.users[?(@.name == "k8s")].user.password}'
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```
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* Set credentials for `foo.kuberntes.com`
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```
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kubectl config set-credentials kubeuser/foo.kubernetes.com --username=kubeuser --password=kubepassword
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```
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* Set active namespace
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```
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kubectl config set-context --current --namespace=namespace_name
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```
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## Viewing, Finding resources
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* List all services in the namespace
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```
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kubectl get services
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```
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* List all pods in all namespaces in wide format
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```
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kubectl get pods -o wide --all-namespaces
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```
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* List all pods in json (or yaml) format
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```
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kubectl get pods -o json
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```
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* Describe resource details (node, pod, svc)
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```
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kubectl describe nodes my-node
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```
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* List services sorted by name
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```
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kubectl get services --sort-by=.metadata.name
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```
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* List pods sorted by restart count
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```
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kubectl get pods --sort-by='.status.containerStatuses[0].restartCount'
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```
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* Rolling update pods for frontend-v1
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```
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kubectl rolling-update frontend-v1 -f frontend-v2.json
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```
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* Scale a replicaset named 'foo' to 3
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```
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kubectl scale --replicas=3 rs/foo
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```
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* Scale a resource specified in "foo.yaml" to 3
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```
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kubectl scale --replicas=3 -f foo.yaml
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```
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* Execute a command in every pod / replica
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```
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for i in 0 1; do kubectl exec foo-$i -- sh -c 'echo $(hostname) > /usr/share/nginx/html/index.html'; done
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```
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## Manage Resources
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* Get documentation for pod or service
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```
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kubectl explain pods,svc
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```
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* Create resource(s) like pods, services or daemonsets
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```
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kubectl create -f ./my-manifest.yaml
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```
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* Apply a configuration to a resource
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```
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kubectl apply -f ./my-manifest.yaml
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```
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* Start a single instance of Nginx
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```
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kubectl run nginx --image=nginx
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```
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* Create a secret with several keys
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```
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cat <<EOF | kubectl create -f -
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apiVersion: v1
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kind: Secret
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metadata:
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name: mysecret
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type: Opaque
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data:
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password: $(echo "s33msi4" | base64)
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username: $(echo "jane"| base64)
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EOF
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```
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* Delete a resource
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```
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kubectl delete -f ./my-manifest.yaml
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```
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## Monitoring & Logging
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* Deploy Heapster from Github repository
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```
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kubectl create -f deploy/kube-config/standalone/
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```
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* Show metrics for nodes
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```
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kubectl top node
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```
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* Show metrics for pods
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```
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kubectl top pod
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```
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* Show metrics for a given pod and its containers
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```
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kubectl top pod pod_name --containers
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```
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* Dump pod logs (stdout)
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```
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kubectl logs pod_name
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```
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* Stream pod container logs (stdout, multi-container case)
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```
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kubectl logs -f pod_name -c my-container
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```
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## Interacting with running pods
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* Run command in pod
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```
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kubectl exec pod_name -- command_name
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```
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* Run command in pod with multiple containers
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```
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kubectl exec pod_name -c container_name -- command_name
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```
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* Get terminal of pod
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```
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kubectl exec -it pod_name /bin/sh
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```
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* Get terminal of a container running in pod with multiple containers
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```
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kubectl exec -it pod_name -c container_name /bin/sh
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```
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