kubectl 命令

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1、创建命名空间、查看命名空间

# kubectl create namespace [命名空间名字]
kubectl create namespace dev-es

# 查看当前命名空间
[root@alpha ~]# kubectl get namespace
NAME                 STATUS AGE
default              Active 23h
dev-es               Active 21h
ingress-nginx        Active 21h
kube-node-lease      Active 23h
kube-public          Active 23h
kube-system          Active 23h
kubernetes-dashboard Active 23h

2、创建k8s免密拉取镜像secret

# 创建k8s Secret
kubectl create secret docker-registry pull-harbor-images --docker-server=192.168.2.139 --docker-username=admin --docker-password='123456' -n dev-es
# 将secret添加到 ServiceAccount
kubectl patch serviceaccount default -p '{"imagePullSecrets": [{"name": "pull-harbor-images"}]}' -n dev-es
# 查看serviceAccount
[root@alpha ~]# kubectl get ServiceAccount -n dev-es
NAME SECRETS AGE
default 1 21h
[root@alpha ~]# kubectl describe ServiceAccount default -n dev-es
Name: default
Namespace: dev-es
Labels: <none>
Annotations: <none>
Image pull secrets: pull-harbor-images
Mountable secrets: default-token-vvh8m
Tokens: default-token-vvh8m
Events: <none>

# 查看secret
[root@alpha ~]# kubectl get secret  -n dev-es
NAME                  TYPE                                  DATA   AGE
default-token-vvh8m   kubernetes.io/service-account-token   3      21h
pull-harbor-images    kubernetes.io/dockerconfigjson        1      21h

3、重启资源pod

方法一： ***Kubernetes 1.15开始才有***
# 重启资源pod【kubectl rollout restart (资源 名称 命名空间)】
kubectl rollout restart deployment dev-nginx -n dev-es

方法二：此方法服务会断(慎用)
# 重启资源pod【先将副本数置为0，在进行部署】
kubectl scale deployment XXXX --replicas=0 -n {namespace}
kubectl scale deployment XXXX --replicas=1 -n {namespace}

方法三：
kubectl get pod {podname} -n {namespace} -o yaml | kubectl replace --force -f -

4、patch 打补丁(会重启pod)

# 为资源添加描述信息(相当于kubectl edit保存退出) - 重启pod
kubectl patch  deployment dev-nginx -n dev-es -p '{"spec": {"template": {"metadata": {"annotations": {"version/config": "2021-0427-154811"}}}}}'

5、创建密保字典(tls - https认证)

# 生成创建密保字典yaml
kubectl create secret tls  tls-https-secret -n dev-es  --cert=/root/tls/https.crt  --key=/root/tls/https.key  --dry-run -o yaml > /tmp/tls.yaml

# 创建密保字典
kubectl apply -f /tmp/tls.yaml

# 查看生成tls.yaml模板样式
#[root@alpha ~]# cat /tmp/tls.yaml
apiVersion: v1
#此处数据创建时已通过base 64进行加密过
data:
 tls.crt: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tC................fjksld=
 tls.key: LS0tLS1CRUdJxdsklfndngdsknfkdngnfdgmf................fkdsa==
kind: Secret
metadata:
 creationTimestamp: null
 name: tls-https-secret
namespace: dev-es
type: kubernetes.io/tls

6、查看pod标签

[root@alpha ~]# kubectl get pod -n dev-es --show-labels
NAME                          READY   STATUS    RESTARTS   AGE   LABELS
dev-nginx-5b6645496b-xnrcm    1/1     Running   1          17h   app=dev-nginx,appname=dev-nginx,env=dev-es,pod-template-hash=5b6645496b

7、为node节点打标签、查node节点标签、删除node标签

# 查看当前node节点标签
[root@alpha ~]# kubectl get node --show-labels
NAME    STATUS   ROLES    AGE   VERSION   LABELS
alpha   Ready    <none>   24h   v1.16.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=alpha,kubernetes.io/os=linux

# 查看node名称
[root@alpha ~]# kubectl get node
NAME    STATUS   ROLES    AGE   VERSION
alpha   Ready    <none>   24h   v1.16.0

# 添加新标签
kubectl label nodes alpha newLabel=new

# 查看新标签添加结果
[root@alpha wx]# kubectl get node --show-labels
NAME    STATUS   ROLES    AGE   VERSION   LABELS
alpha   Ready    <none>   24h   v1.16.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=alpha,kubernetes.io/os=linux,newLabel=new

# 删除node节点标签
kubectl label node alpha newLabel-

# 查看删除标签结果
[root@alpha wx]# kubectl get node --show-labels
NAME STATUS ROLES AGE VERSION LABELS
alpha Ready <none> 24h v1.16.0 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=alpha,kubernetes.io/os=linux

 8、删除node节点

[root@alpha ~]# kubectl get node
NAME     STATUS     ROLES    AGE   VERSION
alpha    Ready      <none>   20d   v1.16.0
test02   NotReady   <none>   18d   v1.16.0

[root@alpha ~]# kubectl delete nodes test02

[root@alpha ~]# kubectl get node
NAME    STATUS   ROLES    AGE   VERSION
alpha   Ready    <none>   20d   v1.16.0

9、修改deployment/daemonset等资源 pod副本数

[root@alpha ~]# kubectl get deployment -n dev-es
NAME         READY   UP-TO-DATE   AVAILABLE   AGE
dev-eureka   3/3     3            3           20d
dev-nginx    1/1     1            1           20d

[root@alpha ~]# kubectl scale deployment dev-eureka -n dev-es  --replicas=2
deployment.apps/dev-eureka scaled

[root@alpha ~]# kubectl get deployment -n dev-es
NAME         READY   UP-TO-DATE   AVAILABLE   AGE
dev-eureka   2/2     2            2           20d
dev-nginx    1/1     1            1           20d

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