如何给k8s集群里的资源打标签
给节点添加角色：
k8s集群，节点如果有多个角色，需要标记出来，可以给对应的节点打上标签，方便后续了解节点的功能
命令：kubectl label nodes 节点名字 node-role.kubernetes.io/你想要的roles(=/-)
最后括号里的加减号，减号就是删除roles，等号就是增加roles
更新标签，在打标签命令后面添加参数--overwrite
举例：
给node节点添加角色：
#给node1节点增加jenkins角色
[root@k8s-master1 ~]# kubectl label nodes k8s-node1 node-role.kubernetes.io/jenkins=
node/k8s-node1 labeled
#给node2节点增加gitlab角色
[root@k8s-master1 ~]# kubectl label nodes k8s-node2 node-role.kubernetes.io/gitlab=
node/k8s-node2 labeled
#查询节点roles
[root@k8s-master1 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master1 Ready master 17d v1.19.4
k8s-node1 Ready jenkins,node 17d v1.19.4
k8s-node2 Ready gitlab,node 14d v1.19.4给deploymen控制器打标签：
更新标签，在打标签命令后面添加参数--overwrite
#查询标签
[root@k8s-master1 k8s]# kubectl get deploy -n my-ns-kcxm kcxm --show-labels
NAME READY UP-TO-DATE AVAILABLE AGE LABELS
kcxm 2/2 2 2 8m47s app=kcxm-gc
#打标签version=v1
[root@k8s-master1 k8s]# kubectl label deploy -n my-ns-kcxm kcxm version=v1
deployment.apps/kcxm labeled
#查询标签
[root@k8s-master1 k8s]# kubectl get deploy -n my-ns-kcxm kcxm --show-labels
NAME READY UP-TO-DATE AVAILABLE AGE LABELS
kcxm 2/2 2 2 9m19s app=kcxm-gc,version=v1
#更新标签，在打标签命令后面添加参数--overwrite
[root@k8s-master1 k8s]# kubectl label deploy -n my-ns-kcxm kcxm version=v2 --overwrite
deployment.apps/kcxm labeled
#查询标签
[root@k8s-master1 k8s]# kubectl get deploy -n my-ns-kcxm kcxm --show-labels
NAME READY UP-TO-DATE AVAILABLE AGE LABELS
kcxm 2/2 2 2 13m app=kcxm-gc,version=v2
#删除标签version=v2
[root@k8s-master1 k8s]# kubectl label deploy -n my-ns-kcxm kcxm version-
deployment.apps/kcxm labeled
#查询标签
[root@k8s-master1 k8s]# kubectl get deploy -n my-ns-kcxm kcxm --show-labels
NAME READY UP-TO-DATE AVAILABLE AGE LABELS
kcxm 2/2 2 2 9m30s app=kcxm-gc给pod打标签：
[root@k8s-master1 k8s]# kubectl get pod -n my-ns-kcxm --show-labels
NAME READY STATUS RESTARTS AGE LABELS
kcxm-84c56f9d5b-595qx 1/1 Running 0 2m42s app=kcxm-gc,pod-template-hash=84c56f9d5b
kcxm-84c56f9d5b-6h4w2 1/1 Running 0 2m42s app=kcxm-gc,pod-template-hash=84c56f9d5b
#给pod打标签version=1.23.1
[root@k8s-master1 k8s]# kubectl label pod -n my-ns-kcxm kcxm-84c56f9d5b-595qx version=1.23.1
pod/kcxm-84c56f9d5b-595qx labeled
#查询标签
[root@k8s-master1 k8s]# kubectl get pod -n my-ns-kcxm --show-labels
NAME READY STATUS RESTARTS AGE LABELS
kcxm-84c56f9d5b-595qx 1/1 Running 0 3m30s app=kcxm-gc,pod-template-hash=84c56f9d5b,version=1.23.1
kcxm-84c56f9d5b-6h4w2 1/1 Running 0 3m30s app=kcxm-gc,pod-template-hash=84c56f9d5b
#给pod删除标签version=1.23.1
[root@k8s-master1 k8s]# kubectl label pod -n my-ns-kcxm kcxm-84c56f9d5b-595qx version-
pod/kcxm-84c56f9d5b-595qx labeled
#删除标签
[root@k8s-master1 k8s]# kubectl get pod -n my-ns-kcxm --show-labels
NAME READY STATUS RESTARTS AGE LABELS
kcxm-84c56f9d5b-595qx 1/1 Running 0 4m7s app=kcxm-gc,pod-template-hash=84c56f9d5b
kcxm-84c56f9d5b-6h4w2 1/1 Running 0 4m7s app=kcxm-gc,pod-template-hash=84c56f9d5b补充：k8s kubernetes给node节点添加标签和删除node节点标签
[root@k8s-master ~]# hostname #查看节点名称
k8s-master
[root@k8s-master ~]#
[root@k8s-master ~]# kubectl get nodes --show-labels #查看节点标签
NAME STATUS ROLES AGE VERSION LABELS
k8s-master Ready control-plane 9d v1.26.0 app=master,beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-master,kubernetes.io/os=linux,node-role.kubernetes.io/control-plane=,node.kubernetes.io/exclude-from-external-load-balancers=
[root@k8s-master ~]# kubectl label nodes k8s-master env=env #给节点添加一个标签env=env
node/k8s-master labeled
[root@k8s-master ~]# kubectl get nodes --show-labels #再次查看节点标签，确定标签添加上了
NAME STATUS ROLES AGE VERSION LABELS
k8s-master Ready control-plane 9d v1.26.0 app=master,beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,env=env,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-master,kubernetes.io/os=linux,node-role.kubernetes.io/control-plane=,node.kubernetes.io/exclude-from-external-load-balancers=
[root@k8s-master ~]# kubectl label nodes k8s-master env- #删除节点标签env=env
node/k8s-master unlabeled
[root@k8s-master ~]#
[root@k8s-master ~]# kubectl get nodes --show-labels #再次查看确定标签已经删除了
NAME STATUS ROLES AGE VERSION LABELS
k8s-master Ready control-plane 9d v1.26.0 app=master,beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-master,kubernetes.io/os=linux,node-role.kubernetes.io/control-plane=,node.kubernetes.io/exclude-from-external-load-balancers=
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