k8s 常用命令（qbit）

• 帮助

kubectl help

• 版本信息

[root@host ~]# kubectl version
Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.3", GitCommit:"2e7996e3e2712684bc73f0dec0200d64eec7fe40", GitTreeState:"clean", BuildDate:"2020-05-20T12:52:00Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.3", GitCommit:"2e7996e3e2712684bc73f0dec0200d64eec7fe40", GitTreeState:"clean", BuildDate:"2020-05-20T12:43:34Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}

• 显示集群信息（查看 master 节点）

root@host ~]# kubectl cluster-info 
Kubernetes master is running at https://192.168.31.27:6443
KubeDNS is running at https://192.168.31.27:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

• 查看节点列表

[root@host68 ~]# kubectl get nodes
NAME      STATUS   ROLES    AGE    VERSION
host68   Ready    master   131d   v1.18.3
host69   Ready    <none>   70d    v1.18.6
host70   Ready    <none>   38d    v1.18.3
host71   Ready    <none>   70d    v1.18.6
host72   Ready    <none>   66d    v1.18.3
host73   Ready    <none>   66d    v1.18.3
host74   Ready    <none>   126d   v1.18.3

• 查看所有 pod 和 namespace

[root@vip-068 ~]# kubectl get pods --all-namespaces
NAMESPACE    NAME                  READY   STATUS    RESTARTS   AGE
default      gitlab-86hgh          1/1     Running   0          124d
default      mysql-qqghr           1/1     Running   0          129d
es           es-46tml              1/1     Running   0          37d
es           es-5twv5              1/1     Running   1          37d
es           es-g4tnp              1/1     Running   0          29d
es           es-vx9r9              1/1     Running   0          30d
es           es-xj8kk              1/1     Running   0          27d

• 列出所有 node 和 pod

kubectl get pod -o=custom-columns=NAME:.metadata.name,STATUS:.status.phase,NODE:.spec.nodeName --all-namespaces

• 查看某个 pod 里面的容器

[root@host68 ~]# kubectl -n es get pod es-46tml -o jsonpath="{.spec['containers','initContainers'][*].name}"
es
# 或者
kubectl -n es describe pod es-46tml

• 列出某个容器里面的目录

# 命令
kubectl -n <namespace> -c <container> exec <pod_name> -- ls -la /
# 示例
kubectl -n es -c es exec es-46tml -- ls -la /usr/share/elasticsearch/config
[root@host68 ~]# kubectl -n es -c es exec es-46tml -- ls -la /usr/share/elasticsearch/config
total 1360
drwxrwxr-x 1 elasticsearch root    4096 Oct 12 13:28 .
drwxrwxr-x 1 elasticsearch root    4096 Sep  5 06:03 ..
-rw-rw---- 1 elasticsearch root     199 Sep  5 06:03 elasticsearch.keystore
-rw-rw---- 1 elasticsearch root      53 May 28 16:33 elasticsearch.yml
-rw-rw---- 1 elasticsearch root    2301 May 28 16:28 jvm.options
drwxrwxr-x 2 elasticsearch root    4096 May 28 16:31 jvm.options.d
-rw-rw---- 1 elasticsearch root    7860 May 28 16:33 log4j2.properties
-rw-rw---- 1 elasticsearch root     473 May 28 16:32 role_mapping.yml
-rw-rw---- 1 elasticsearch root     197 May 28 16:32 roles.yml
-rw-r--r-- 1 root          root 1345763 Oct 12 13:28 synonym.txt
-rw-rw---- 1 elasticsearch root       0 May 28 16:32 users
-rw-rw---- 1 elasticsearch root       0 May 28 16:32 users_roles

• 删除容器里面的文件

kubectl -n es -c es exec es-46tml -- rm /usr/share/elasticsearch/config/synonym.txt

• 创建目录

kubectl -n es -c es exec es-46tml -- mkdir /usr/share/elasticsearch/config/analysis

• 拷贝文件到容器目录

# 拷贝
kubectl -n es -c es cp synonym.txt es-46tml:/usr/share/elasticsearch/config/analysis
# 查看
[root@host68 test]# kubectl -n es -c es exec es-46tml -- ls -la /usr/share/elasticsearch/config/analysis
total 1324
drwxr-xr-x 2 root          root    4096 Oct 13 05:57 .
drwxrwxr-x 1 elasticsearch root    4096 Oct 13 05:56 ..
-rw-r--r-- 1 root          root 1345763 Oct 13 05:57 synonym.txt

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