k8s 常用命令（qbit）

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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       70d    v1.18.6
host70   Ready       38d    v1.18.3
host71   Ready       70d    v1.18.6
host72   Ready       66d    v1.18.3
host73   Ready       66d    v1.18.3
host74   Ready       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

# 命令
kubectl -n  -c  exec  -- 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

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

# 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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k8s 常用命令（qbit）

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