kubectl get --help

本文介绍如何使用kubectl命令来显示一个或多个Kubernetes资源。通过不同的选项可以过滤、选择输出格式及展示特定信息。

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.

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.

Examples:

List all pods in ps output format

kubectl get pods

List all pods in ps output format with more information (such as node name)

kubectl get pods -o wide

List a single replication controller with specified NAME in ps output format

kubectl get replicationcontroller web

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

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|name|go-template|go-template-file|template|templatefile|jsonpath|jsonpath-as-json|jsonpath-file|custom-columns-file|custom-columns|wide
See custom columns [https://kubernetes.io/docs/reference/kubectl/overview/#custom-columns], golang template
[http://golang.org/pkg/text/template/#pkg-overview] and jsonpath template
[https://kubernetes.io/docs/reference/kubectl/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)
–show-managed-fields=false: If true, keep the managedFields when printing objects in JSON or YAML format.
–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.
–watch-only=false: Watch for changes to the requested object(s), without listing/getting first.

Usage:
kubectl get
[(-o|–output=)json|yaml|name|go-template|go-template-file|template|templatefile|jsonpath|jsonpath-as-json|jsonpath-file|custom-columns-file|custom-columns|wide]
(TYPE[.VERSION][.GROUP] [NAME | -l label] | TYPE[.VERSION][.GROUP]/NAME …) [flags] [options]

Use “kubectl options” for a list of global command-line options (applies to all commands).

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