一、為什么需要標(biāo)簽？

k8s集群如果由大量節(jié)點組成，可將節(jié)點打上對應(yīng)的標(biāo)簽，然后通過標(biāo)簽進(jìn)行篩選及查看,更好的進(jìn)行資源對象的相關(guān)選擇與匹配

二、怎么查看目前node上具有的標(biāo)簽

[root@master01 ~]# kubectl get node --show-labels
NAME       STATUS   ROLES                  AGE     VERSION   LABELS
master01   Ready    control-plane,master   3d10h   v1.21.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=master01,kubernetes.io/os=linux,node-role.kubernetes.io/control-plane=,node-role.kubernetes.io/master=,node.kubernetes.io/exclude-from-external-load-balancers=
worker01   Ready    <none>                 3d9h    v1.21.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=worker01,kubernetes.io/os=linux,region=huanan
worker02   Ready    <none>                 3d9h    v1.21.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=worker02,kubernetes.io/os=linux

三、設(shè)置節(jié)點標(biāo)簽信息

1、設(shè)置節(jié)點標(biāo)簽

[root@master01 ~]# kubectl label node worker02 region=guanzhou
node/worker02 labeled

2、查看 worker02的標(biāo)簽是否已經(jīng)設(shè)置上

[root@master01 ~]# kubectl get nodes -L region
NAME       STATUS   ROLES                  AGE     VERSION   REGION
master01   Ready    control-plane,master   3d10h   v1.21.0   
worker01   Ready    <none>                 3d9h    v1.21.0   huanan
worker02   Ready    <none>                 3d9h    v1.21.0   guanzhou

 3、多維度標(biāo)簽

 3.1 設(shè)置多維度標(biāo)簽

也可以加其它的多維度標(biāo)簽,用于不同的需要區(qū)分的場景

如把worker01標(biāo)簽為華南區(qū),A機房,測試環(huán)境,游戲業(yè)務(wù)

[root@master01 ~]# kubectl label node worker01 zone=A env=test bussiness=game
node/worker01 labeled

 3.2  顯示節(jié)點的相應(yīng)標(biāo)簽

[root@master01 ~]# kubectl get node -L zone,env
NAME       STATUS   ROLES                  AGE     VERSION   ZONE   ENV
master01   Ready    control-plane,master   3d10h   v1.21.0          
worker01   Ready    <none>                 3d9h    v1.21.0   A      test
worker02   Ready    <none>                 3d9h    v1.21.0  

 四、通過標(biāo)簽來查找node 

4.1 查找env=test的節(jié)點

[root@master01 ~]# kubectl get nodes -l env=test --show-labels
NAME       STATUS   ROLES    AGE    VERSION   LABELS
worker01   Ready    <none>   3d9h   v1.21.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,bussiness=game,env=test,kubernetes.io/arch=amd64,kubernetes.io/hostname=worker01,kubernetes.io/os=linux,region=huanan,zone=A
 

五、修改標(biāo)簽

[root@master01 ~]# kubectl label node worker01 env=prod --overwrite=true
node/worker01 labeled

六、刪除node的標(biāo)簽

[root@master01 ~]# kubectl label node worker01 env-
node/worker01 labeled
[root@master01 ~]# kubectl get node -L env
NAME       STATUS   ROLES                  AGE     VERSION   ENV
master01   Ready    control-plane,master   3d10h   v1.21.0   
worker01   Ready    <none>                 3d9h    v1.21.0   
worker02   Ready    <none>                 3d9h    v1.21.0   

七、標(biāo)簽選擇器

[root@master01 ~]# kubectl label node worker01 env=test1
node/worker01 labeled
[root@master01 ~]# kubectl label node worker02 env=test2
node/worker02 labeled
[root@master01 ~]# kubectl get node -l 'env in(test1,test2)'
NAME       STATUS   ROLES    AGE    VERSION
worker01   Ready    <none>   3d9h   v1.21.0
worker02   Ready    <none>   3d9h   v1.21.0
[root@master01 ~]# kubectl get node -l 'env in(test1,test2)' --show-labels
NAME       STATUS   ROLES    AGE    VERSION   LABELS
worker01   Ready    <none>   3d9h   v1.21.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,bussiness=game,env=test1,kubernetes.io/arch=amd64,kubernetes.io/hostname=worker01,kubernetes.io/os=linux,region=huanan,zone=A
worker02   Ready    <none>   3d9h   v1.21.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,env=test2,kubernetes.io/arch=amd64,kubernetes.io/hostname=worker02,kubernetes.io/os=linux,region=guanzhou

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