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Kubernetes

Kubernetes Commands: kubectl get – Tutorials and Examples

January 17, 2020 comments off

kubectl get- Display one or many resources

Prints a table of the most important information about the specified resources. You can filter the
list using…

  • A label selector and
  • The –selector flag
  • If the desired resource type is namespaced you will only see results in your current namespace unless you pass –all-namespaces.
  • Uninitialized objects are not shown unless –include-uninitialized is passed.
  • By specifying the output as ‘template’ and providing a Go template as the value of the –template
    flag, you can filter the attributes of the fetched resources.
  • Use “kubectl api-resources” for a complete list of supported resources.
# Get commands with basic output
kubectl get services # List all services in the namespace
kubectl get pods --all-namespaces # List all pods in all namespaces
kubectl get pods -o wide # List all pods in the namespace, with more details
kubectl get deployment my-dep # List a particular deployment
kubectl get pods # List all pods in the namespace
kubectl get pod my-pod -o yaml # Get a pod's YAML
kubectl get pod my-pod -o yaml --export # Get a pod's YAML without cluster specific information
kubectl get replicationcontroller web # List a single replication controller with specified NAME
# List deployments in JSON output format, in the "v1" version of the "apps" API group:
$ kubectl get deployments.v1.apps -o json
# List a single pod in JSON output format.
$ kubectl get -o json pod web-pod-13je7
# List a pod identified by type and name specified in "pod.yaml" in JSON output format.
$ kubectl get -f pod.yaml -o json
# List resources from a directory with kustomization.yaml - e.g. dir/kustomization.yaml.
$ kubectl get -k dir/
# Return only the phase value of the specified pod.
$ kubectl get -o template pod/web-pod-13je7 --template={{.status.phase}}
# List resource information in custom columns.
$ kubectl get pod test-pod -o custom-columns=CONTAINER:.spec.containers[0].name,IMAGE:.spec.containers[0].image
# List all replication controllers and services together in ps output format.
$ kubectl get rc,services
# List one or more resources by their type and names.
$ kubectl get rc/web service/frontend pods/web-pod-13je7
--field-selector
Field selectors let you select Kubernetes resources based on the value of one or more resource fields. Here are some example field selector queries:
# Get all running pods in the namespace
$ kubectl get pods --field-selector=status.phase=Running
# You can use the =, ==, and != operators with field selectors
$ kubectl get services --all-namespaces --field-selector metadata.namespace!=default
$ kubectl get pods --field-selector=status.phase!=Running,spec.restartPolicy=Always
$ kubectl get statefulsets,services --all-namespaces --field-selector metadata.namespace!=default
$ kubectl delete jobs.batch --field-selector status.successful==1
--sort-by
$ kubectl get po --sort-by=.status.startTime
# List Services Sorted by Name
$ kubectl get services --sort-by=.metadata.name
# List pods Sorted by Restart Count
$ kubectl get pods --sort-by='.status.containerStatuses[0].restartCount'
# List PersistentVolumes in test namespace sorted by capacity
$ kubectl get pv -n test --sort-by=.spec.capacity.storage
# List Events sorted by timestamp
$ kubectl get events --sort-by=.metadata.creationTimestamp
--show-labels
# Show labels for all pods (or any other Kubernetes object that supports labelling)
$ kubectl get pods --show-labels
Options:
-A, --all-namespaces=false: If present, list the requested object(s) across all namespaces.
Namespace in current context is ignored even if specified with --namespace.
--allow-missing-template-keys=true: If true, ignore any errors in templates when a field or
map key is missing in the template. Only applies to golang and jsonpath output formats.
--chunk-size=500: Return large lists in chunks rather than all at once. Pass 0 to disable.
This flag is beta and may change in the future.
--field-selector='': Selector (field query) to filter on, supports '=', '==', and '!='.(e.g.
--field-selector key1=value1,key2=value2). The server only supports a limited number of field
queries per type.
-f, --filename=[]: Filename, directory, or URL to files identifying the resource to get from a
server.
--ignore-not-found=false: If the requested object does not exist the command will return exit
code 0.
-k, --kustomize='': Process the kustomization directory. This flag can't be used together with -f
or -R.
-L, --label-columns=[]: Accepts a comma separated list of labels that are going to be presented as
columns. Names are case-sensitive. You can also use multiple flag options like -L label1 -L
label2...
--no-headers=false: When using the default or custom-column output format, don't print headers
(default print headers).
-o, --output='': Output format. One of:
json|yaml|wide|name|custom-columns=...|custom-columns-file=...|go-template=...|go-template-file=...|jsonpath=...|jsonpath-file=...
See custom columns [http://kubernetes.io/docs/user-guide/kubectl-overview/#custom-columns], golang
template [http://golang.org/pkg/text/template/#pkg-overview] and jsonpath template
[http://kubernetes.io/docs/user-guide/jsonpath].
--output-watch-events=false: Output watch event objects when --watch or --watch-only is used.
Existing objects are output as initial ADDED events.
--raw='': Raw URI to request from the server. Uses the transport specified by the kubeconfig
file.
-R, --recursive=false: Process the directory used in -f, --filename recursively. Useful when you
want to manage related manifests organized within the same directory.
-l, --selector='': Selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l
key1=value1,key2=value2)
--server-print=true: If true, have the server return the appropriate table output. Supports
extension APIs and CRDs.
--show-kind=false: If present, list the resource type for the requested object(s).
--show-labels=false: When printing, show all labels as the last column (default hide labels
column)
--sort-by='': If non-empty, sort list types using this field specification. The field
specification is expressed as a JSONPath expression (e.g. '{.metadata.name}'). The field in the API
resource specified by this JSONPath expression must be an integer or a string.
--template='': Template string or path to template file to use when -o=go-template,
-o=go-template-file. The template format is golang templates
[http://golang.org/pkg/text/template/#pkg-overview].
-w, --watch=false: After listing/getting the requested object, watch for changes. Uninitialized
objects are excluded if no object name is provided.
--watch-only=false: Watch for changes to the requested object(s), without listing/getting
first.
view raw kubectl-get.sh hosted with ❤ by GitHub

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