K8s經常使用命令操做

1、kubernetes經常使用命令

  1、kubectl命令補全

　　一、master安裝命令補全，並臨時生效

yum install -y bash-completion
source /usr/share/bash-completion/bash_completion

　　二、永久生效

source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc

  2、啓動狀態

　　一、master節點

1、更改配置文件，從新加載
systemctl daemon-reload

2、啓動master相關組件
systemctl start kube-apiserver
systemctl start kube-controller-manager
systemctl start kube-scheduler

3、中止master相關組件
systemctl stop kube-apiserver
systemctl stop kube-controller-manager
systemctl stop kube-scheduler

4、重啓master相關組件
systemctl restart kube-apiserver
systemctl restart kube-controller-manager
systemctl restart kube-scheduler

5、查看master相關組件狀態
systemctl status kube-apiserver
systemctl status kube-controller-manager
systemctl status kube-scheduler

　　二、etcd服務

1、更改配置後，從新加載
systemctl daemon-reload

2、啓動etcd服務
systemctl start etcd.service

3、中止etcd服務
systemctl stop etcd.service

4、重啓etcd服務
systemctl restart etcd.service

5、查看etcd服務狀態
systemctl status etcd.service

　　三、worker節點


1、更改配置後，重啓加載
systemctl daemon-reload

2、啓動worker端相關組件
systemctl start kube-proxy
systemctl start docker
systemctl start kubelet

3、中止worker端相關組件
systemctl stop kube-proxy
systemctl stop docker
systemctl stop kubelet

4、重啓worker端相關組件
systemctl restart kube-proxy
systemctl restart docker
systemctl restart kubelet

5、查看worker端相關組件狀態
systemctl status kube-proxy
systemctl status docker
systemctl status kubelet

  3、kubectl 經常使用命令操做

　　一、英文幫助信息

　　　　一、kubectl -h 查看具體操做參數

kubectl controls the Kubernetes cluster manager. 

Find more information at https://github.com/kubernetes/kubernetes.

Basic Commands (Beginner（初學者）):
  create         Create a resource from a file or from stdin.
  expose         Take a replication controller, service, deployment or pod and expose it as a new Kubernetes Service
  run            Run a particular image on the cluster
  set            Set specific features on objects
  run-container  Run a particular image on the cluster. This command is deprecated, use "run" instead

Basic Commands (Intermediate（中級）):
  get            Display one or many resources
  explain        Documentation of resources
  edit           Edit a resource on the server
  delete         Delete resources by filenames, stdin, resources and names, or by resources and label selector

Deploy Commands:
  rollout        Manage the rollout of a resource
  rolling-update Perform a rolling update of the given ReplicationController
  scale          Set a new size for a Deployment, ReplicaSet, Replication Controller, or Job
  autoscale      Auto-scale a Deployment, ReplicaSet, or ReplicationController

Cluster Management Commands:
  certificate    Modify certificate resources.
  cluster-info   Display cluster info
  top            Display Resource (CPU/Memory/Storage) usage.
  cordon         Mark node as unschedulable
  uncordon       Mark node as schedulable
  drain          Drain node in preparation for maintenance
  taint          Update the taints on one or more nodes

Troubleshooting and Debugging Commands:
  describe       Show details of a specific resource or group of resources
  logs           Print the logs for a container in a pod
  attach         Attach to a running container
  exec           Execute a command in a container
  port-forward   Forward one or more local ports to a pod
  proxy          Run a proxy to the Kubernetes API server
  cp             Copy files and directories to and from containers.
  auth           Inspect authorization

Advanced Commands:
  apply          Apply a configuration to a resource by filename or stdin
  patch          Update field(s) of a resource using strategic merge patch
  replace        Replace a resource by filename or stdin
  convert        Convert config files between different API versions

Settings Commands:
  label          Update the labels on a resource
  annotate       Update the annotations on a resource
  completion     Output shell completion code for the specified shell (bash or zsh)

Other Commands:
  api-versions   Print the supported API versions on the server, in the form of "group/version"
  config         Modify kubeconfig files
  help           Help about any command
  plugin         Runs a command-line plugin
  version        Print the client and server version information

Use "kubectl <command> --help" for more information about a given command.
Use "kubectl options" for a list of global command-line options (applies to all commands).

　　　　二、kubectl能夠操做的資源

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. 

This command will hide resources that have completed, such as pods that are in the Succeeded or Failed phases. You can
see the full results for any resource by providing the --show-all flag. 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.

Valid resource types include: 

  * all  
  * certificatesigningrequests (aka 'csr')  
  * clusterrolebindings  
  * clusterroles  
  * componentstatuses (aka 'cs')  
  * configmaps (aka 'cm')  
  * controllerrevisions  
  * cronjobs  
  * customresourcedefinition (aka 'crd')  
  * daemonsets (aka 'ds')  
  * deployments (aka 'deploy')  
  * endpoints (aka 'ep')  
  * events (aka 'ev')  
  * horizontalpodautoscalers (aka 'hpa')  
  * ingresses (aka 'ing')  
  * jobs  
  * limitranges (aka 'limits')  
  * namespaces (aka 'ns')  
  * networkpolicies (aka 'netpol')  
  * nodes (aka 'no')  
  * persistentvolumeclaims (aka 'pvc')  
  * persistentvolumes (aka 'pv')  
  * poddisruptionbudgets (aka 'pdb')  
  * podpreset  
  * pods (aka 'po')  
  * podsecuritypolicies (aka 'psp')  
  * podtemplates  
  * replicasets (aka 'rs')  
  * replicationcontrollers (aka 'rc')  
  * resourcequotas (aka 'quota')  
  * rolebindings  
  * roles  
  * secrets  
  * serviceaccounts (aka 'sa')  
  * services (aka 'svc')  
  * statefulsets (aka 'sts')  
  * storageclasses (aka 'sc')

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 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
  
  # Return only the phase value of the specified pod.
  kubectl get -o template pod/web-pod-13je7 --template={{.status.phase}}
  
  # 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
  
  # List all resources with different types.
  kubectl get all

Options:
      --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.
      --export=false: If true, use 'export' for the resources.  Exported resources are stripped of cluster-specific
information.
      --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.
      --include-extended-apis=true: If true, include definitions of new APIs via calls to the API server. [default true]
      --include-uninitialized=false: If true, the kubectl command applies to uninitialized objects. If explicitly set to
false, this flag overrides other flags that make the kubectl commands apply to uninitialized objects, e.g., "--all".
Objects with empty metadata.initializers are regarded as initialized.
  -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].
      --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)
  -a, --show-all=false: When printing, show all resources (default hide terminated pods.)
      --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].
      --use-openapi-print-columns=true: If true, use x-kubernetes-print-column metadata (if present) from the OpenAPI
schema for displaying a resource.
  -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.

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

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

　　　　三、獲取具體操做的幫助信息

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

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 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
  
  # Return only the phase value of the specified pod.
  kubectl get -o template pod/web-pod-13je7 --template={{.status.phase}}
  
  # 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
  
  # List all resources with different types.
  kubectl get all

Options:
      --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.
      --export=false: If true, use 'export' for the resources.  Exported resources are stripped of cluster-specific
information.
      --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.
      --include-extended-apis=true: If true, include definitions of new APIs via calls to the API server. [default true]
      --include-uninitialized=false: If true, the kubectl command applies to uninitialized objects. If explicitly set to
false, this flag overrides other flags that make the kubectl commands apply to uninitialized objects, e.g., "--all".
Objects with empty metadata.initializers are regarded as initialized.
  -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].
      --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)
  -a, --show-all=false: When printing, show all resources (default hide terminated pods.)
      --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].
      --use-openapi-print-columns=true: If true, use x-kubernetes-print-column metadata (if present) from the OpenAPI
schema for displaying a resource.
  -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.

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

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

具體操做的幫助文檔

　　二、查看類命令

　　　　一、獲取節點相應服務的信息：kubectl get nodes

kubectl get pods

　　按selector名來查找pod

kubectl get pod --selector name=redis

　　　　二、查看集羣信息

kubectl cluster-info

　　　　三、查看各組件信息

kubectl -s http://localhost:8080 get componentstatuses

　　　　四、查看pods所在的運行節點

kubectl get pods -o wide

　　　　五、查看pods定義的詳細信息

kubectl get pods -o yaml

　　　　六、查看運行的pod的環境變量

kubectl exec pod名 env

　　　　七、查看指定pod的日誌

kubectl logs -f pods/heapster-xxxxx -n kube-system

　　三、操做類命令

　　　　一、建立資源

kubectl create -f 文件名.yaml

　　　　二、重建資源

kubectl replace -f 文件名  [--force]

 　　　　三、刪除資源

kubectl delete -f 文件名
kubectl delete pod pod名
kubectl delete rc rc名
kubectl delete service service名
kubectl delete pod --all

  4、kubectl進階命令操做

　　一、kubectl get：獲取指定資源的基本信息

1 kubectl get services kubernetes-dashboard -n kube-system #查看全部service
2 kubectl get deployment kubernetes-dashboard -n kube-system #查看全部發布
3 kubectl get pods --all-namespaces #查看全部pod
4 kubectl get pods -o wide --all-namespaces #查看全部pod的IP及節點
5 kubectl get pods -n kube-system | grep dashboard
6 kubectl get nodes -lzone #獲取zone的節點

　　二、kubectl describe：查看指定資源詳細描述信息

1 kubectl describe service/kubernetes-dashboard --namespace="kube-system"
2 kubectl describe pods/kubernetes-dashboard-349859023-g6q8c --namespace="kube-system" #指定類型查看
3 kubectl describe pod nginx-772ai #查看pod詳細信息

　　三、kubectl scale：動態伸縮

1 kubectl scale rc nginx --replicas=5 # 動態伸縮
2 kubectl scale deployment redis-slave --replicas=5 #動態伸縮
3 kubectl scale --replicas=2 -f redis-slave-deployment.yaml #動態伸縮

　　四、kubectl exec：進入pod啓動的容器

1 kubectl exec -it redis-master-1033017107-q47hh /bin/bash #進入容器

　　五、kubectl label：添加label值

1 kubectl label nodes node1 zone=north #增長節點lable值 spec.nodeSelector: zone: north #指定pod在哪一個節點
2 kubectl label pod redis-master-1033017107-q47hh role=master #增長lable值 [key]=[value]
3 kubectl label pod redis-master-1033017107-q47hh role- #刪除lable值
4 kubectl label pod redis-master-1033017107-q47hh role=backend --overwrite #修改lable值

　　六、kubectl rolling-update：滾動升級

1 kubectl rolling-update redis-master -f redis-master-controller-v2.yaml #配置文件滾動升級
2 kubectl rolling-update redis-master --image=redis-master:2.0 #命令升級
3 kubectl rolling-update redis-master --image=redis-master:1.0 --rollback #pod版本回滾

  5、etcdctl 經常使用操做

1 etcdctl cluster-health #檢查網絡集羣健康狀態
2 etcdctl --endpoints=https://192.168.71.221:2379 cluster-health #帶有安全認證檢查網絡集羣健康狀態
3 etcdctl member list
4 etcdctl set /k8s/network/config '{ "Network": "10.1.0.0/16" }'
5 etcdctl get /k8s/network/config