yrl's blog
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K8s-标签

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标签

k8s集群如果由大量节点组成，可将节点打上对应的标签，然后通过标签进行筛选及查看,更好的进行资源对象的相关选择与匹配

查看节点标签信息

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[root@k8s-master01 kubernetes]# kubectl get nodes --show-labels
NAME           STATUS   ROLES                  AGE   VERSION   LABELS
k8s-master01   Ready    control-plane,master   12h   v1.21.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-master01,kubernetes.io/os=linux,node-role.kubernetes.io/control-plane=,node-role.kubernetes.io/master=,node.kubernetes.io/exclude-from-external-load-balancers=
k8s-node01     Ready    <none>                 78m   v1.21.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-node01,kubernetes.io/os=linux
k8s-node02     Ready    <none>                 77m   v1.21.0   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=k8s-node02,kubernetes.io/os=linux

设置标签

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#指定为某个node添加标签
kubectl label node k8s-node02 key1=value1

截图12

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#指定为某个node添加多个标签
 kubectl label node k8s-node01 key1=value1 key2=value2

截图13

指定标签查询node

注意-L和-l大小写区别

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[root@k8s-master01 kubernetes]# kubectl get nodes
NAME           STATUS   ROLES                  AGE   VERSION
k8s-master01   Ready    control-plane,master   12h   v1.21.0
k8s-node01     Ready    <none>                 91m   v1.21.0
k8s-node02     Ready    <none>                 90m   v1.21.0
======================================================================

[root@k8s-master01 kubernetes]# kubectl get nodes -L key2
NAME           STATUS   ROLES                  AGE   VERSION   KEY2
k8s-master01   Ready    control-plane,master   12h   v1.21.0   
k8s-node01     Ready    <none>                 98m   v1.21.0   value2
k8s-node02     Ready    <none>                 98m   v1.21.0 

[root@k8s-master01 kubernetes]# kubectl get nodes -l key2
NAME         STATUS   ROLES    AGE    VERSION
k8s-node01   Ready    <none>   100m   v1.21.0
======================================================================
[root@k8s-master01 kubernetes]# kubectl get nodes -L key1,key2
NAME           STATUS   ROLES                  AGE   VERSION   KEY1     KEY2
k8s-master01   Ready    control-plane,master   12h   v1.21.0            
k8s-node01     Ready    <none>                 98m   v1.21.0   value1   value2
k8s-node02     Ready    <none>                 97m   v1.21.0   value1 

[root@k8s-master01 kubernetes]# kubectl get nodes -l key1,key2
NAME         STATUS   ROLES    AGE    VERSION
k8s-node01   Ready    <none>   101m   v1.21.0
================================================================================
[root@k8s-master01 kubernetes]# kubectl get nodes -L key1
NAME           STATUS   ROLES                  AGE    VERSION   KEY1
k8s-master01   Ready    control-plane,master   12h    v1.21.0   
k8s-node01     Ready    <none>                 101m   v1.21.0   value1
k8s-node02     Ready    <none>                 101m   v1.21.0   value1

[root@k8s-master01 kubernetes]# kubectl get nodes -l key1
NAME         STATUS   ROLES    AGE    VERSION
k8s-node01   Ready    <none>   102m   v1.21.0
k8s-node02   Ready    <none>   101m   v1.21.0

修改标签

kubectl label node 节点名称 标签key=标签value --overwrite=true

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[root@k8s-master01 kubernetes]# kubectl get nodes -L key1,key2
NAME           STATUS   ROLES                  AGE    VERSION   KEY1     KEY2
k8s-master01   Ready    control-plane,master   12h    v1.21.0            
k8s-node01     Ready    <none>                 103m   v1.21.0   value1   value2
k8s-node02     Ready    <none>                 102m   v1.21.0   value1   

[root@k8s-master01 kubernetes]# kubectl label node k8s-node02 key1=v2 --overwrite=true
node/k8s-node02 labeled

[root@k8s-master01 kubernetes]# kubectl get nodes -L key1,key2                        
NAME           STATUS   ROLES                  AGE    VERSION   KEY1     KEY2
k8s-master01   Ready    control-plane,master   12h    v1.21.0            
k8s-node01     Ready    <none>                 104m   v1.21.0   value1   value2
k8s-node02     Ready    <none>                 103m   v1.21.0   v2

删除标签

使用key加一个减号的写法来取消标签

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kubectl label node k8s-node02 key1-

截图14

标签选择器

标签选择器主要有2类:

  • 等值关系: =, !=
  • 集合关系: KEY in (VALUE1, VALUE2……)

截图15

通过标签操作pod

  • 为pod设置label,用于控制器通过label与pod关联
  • 语法与前面学的node标签几乎一致

查看pod的标签

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[root@k8s-master1 ~]# kubectl get pods --show-labels
NAME          READY   STATUS    RESTARTS   AGE   LABELS
pod-stress     1/1    Running   0          7m25s   <none>

打标签

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[root@k8s-master1 ~]# kubectl label pod pod-stress region=huanai zone=A env=test bussiness=game
pod/pod-stress labeled

[root@k8s-master1 ~]# kubectl get pods --show-labels
NAME          READY   STATUS    RESTARTS   AGE     LABELS
pod-stress    1/1     Running   0          8m54s   bussiness=game,env=test,region=huanai,zone=A

通过等值关系标签查询

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[root@k8s-master1 ~]# kubectl get pods -l zone=A
NAME         READY   STATUS    RESTARTS   AGE
pod-stress   1/1     Running   0          9m22s

通过集合关系标签查询

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[root@k8s-master1 ~]# kubectl get pods -l "zone in (A,B,C)"
NAME         READY   STATUS    RESTARTS   AGE
pod-stress   1/1     Running   0          9m55s

删除标签后再验证

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[root@k8s-master1 ~]# kubectl label pod pod-stress region- zone- env- bussiness-
pod/pod-stress labeled

[root@k8s-master1 ~]# kubectl get pods --show-labels
NAME          READY   STATUS    RESTARTS   AGE   LABELS
pod-stress    1/1     Running   0          16m     <none>

小结:

  • pod的label与node的label操作方式几乎相同
  • node的label用于pod调度到指定label的node节点
  • pod的label用于controller关联控制的pod