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127 lines
4.2 KiB
Markdown
127 lines
4.2 KiB
Markdown
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An assortment of compact kubectl examples
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See also: [Kubectl overview](kubectl-overview.md) and [JsonPath guide](jsonpath.md).
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## Creating Objects
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```console
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$ kubectl create -f ./file.yml # create resource(s) in a json or yaml file
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$ kubectl create -f ./file1.yml -f ./file2.yaml # create resource(s) in a json or yaml file
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$ kubectl create -f ./dir # create resources in all .json, .yml, and .yaml files in dir
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# Create from a URL
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$ kubectl create -f http://www.fpaste.org/279276/48569091/raw/
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# Create multiple YAML objects from stdin
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$ cat <<EOF | kubectl create -f -
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apiVersion: v1
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kind: Pod
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metadata:
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name: busybox-sleep
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spec:
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containers:
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- name: busybox
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image: busybox
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args:
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- sleep
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- "1000000"
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---
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apiVersion: v1
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kind: Pod
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metadata:
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name: busybox-sleep-less
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spec:
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containers:
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- name: busybox
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image: busybox
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args:
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- sleep
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- "1000"
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EOF
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# Create a secret with several keys
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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: $(echo "jane" | base64)
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EOF
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# TODO: kubectl-explain example
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```
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## Viewing, Finding Resources
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```console
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# Columnar output
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$ kubectl get services # List all services in the namespace
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$ kubectl get pods --all-namespaces # List all pods in all namespaces
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$ kubectl get pods -o wide # List all pods in the namespace, with more details
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$ kubectl get rc <rc-name> # List a particular replication controller
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$ kubectl get replicationcontroller <rc-name> # List a particular RC
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# Verbose output
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$ kubectl describe nodes <node-name>
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$ kubectl describe pods <pod-name>
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$ kubectl describe pods/<pod-name> # Equivalent to previous
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$ kubectl describe pods <rc-name> # Lists pods created by <rc-name> using common prefix
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# List Services Sorted by Name
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$ kubectl get services --sort-by=.metadata.name
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# List pods Sorted by Restart Count
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$ kubectl get pods --sort-by=.status.containerStatuses[0].restartCount
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# Get the version label of all pods with label app=cassandra
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$ kubectl get pods --selector=app=cassandra rc -o 'jsonpath={.items[*].metadata.labels.version}'
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# Get ExternalIPs of all nodes
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$ kubectl get nodes -o jsonpath='{.items[*].status.addresses[?(@.type=ExternalIP)].address}'
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# List Names of Pods that belong to Particular RC
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# "jq" command useful for transformations that are too complex for jsonpath
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$ sel=$(./kubectl get rc <rc-name> --output=json | jq -j '.spec.selector | to_entries | .[] | "\(.key)=\(.value),"')
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$ sel=${sel%?} # Remove trailing comma
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$ pods=$(kubectl get pods --selector=$sel --output=jsonpath={.items..metadata.name})`
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# Check which nodes are ready
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$ kubectl get nodes -o jsonpath='{range .items[*]}{@.metadata.name}:{range @.status.conditions[*]}{@.type}={@.status};{end}{end}'| tr ';' "\n" | grep "Ready=True"
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```
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## Modifying and Deleting Resources
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```console
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$ kubectl label pods <pod-name> new-label=awesome # Add a Label
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$ kubectl annotate pods <pod-name> icon-url=http://goo.gl/XXBTWq # Add an annotation
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# TODO: examples of kubectl edit, patch, delete, replace, scale, and rolling-update commands.
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```
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## Interacting with running Pods
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```console
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$ kubectl logs <pod-name> # dump pod logs (stdout)
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$ kubectl logs -f <pod-name> # stream pod logs (stdout) until canceled (ctrl-c) or timeout
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$ kubectl run -i --tty busybox --image=busybox -- sh # Run pod as interactive shell
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$ kubectl attach <podname> -i # Attach to Running Container
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$ kubectl port-forward <podname> <local-and-remote-port> # Forward port of Pod to your local machine
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$ kubectl port-forward <servicename> <port> # Forward port to service
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$ kubectl exec <pod-name> -- ls / # Run command in existing pod (1 container case)
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$ kubectl exec <pod-name> -c <container-name> -- ls / # Run command in existing pod (multi-container case)
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```
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