Kubernetes-Label

Label

Label：对k8s中各种资源分类、分组，添加一个具有特别属性的标签。
Selector：通过一个过滤的语法进行查找到对应标签的资源。

设置label

labels:
  run: busybox

查询所有带有label的Pod

$ kubectl get pods --show-labels -A
NAMESPACE     NAME                                       READY   STATUS             RESTARTS   AGE    LABELS
default       busybox                                    0/1     CrashLoopBackOff   6          7m2s   <none>
default       nginx-64c5bdd48d-49r5f                     1/1     Running            0          16h    app=nginx,pod-template-hash=64c5bdd48d
default       nginx-64c5bdd48d-v7nfl                     1/1     Running            0          16h    app=nginx,pod-template-hash=64c5bdd48d
kube-public   busybox                                    0/1     CrashLoopBackOff   6          7m6s   run=busybox
kube-system   calico-kube-controllers-756dd4db79-hxwpp   1/1     Running            0          37h    k8s-app=calico-kube-controllers,pod-template-hash=756dd4db79
kube-system   calico-node-b4njn                          1/1     Running            0          37h    controller-revision-hash=6c59f494b8,k8s-app=calico-node,pod-template-generation=1
kube-system   calico-node-klbts                          1/1     Running            0          37h    controller-revision-hash=6c59f494b8,k8s-app=calico-node,pod-template-generation=1
kube-system   calico-node-shhzk                          1/1     Running            0          37h    controller-revision-hash=6c59f494b8,k8s-app=calico-node,pod-template-generation=1
kube-system   calico-node-tqmcq                          1/1     Running            0          37h    controller-revision-hash=6c59f494b8,k8s-app=calico-node,pod-template-generation=1
kube-system   metrics-server-b7cff9c67-c4w6l             1/1     Running            0          37m    k8s-app=metrics-server,pod-template-hash=b7cff9c67

查询指定label的pod

$ kubectl get pods --show-labels -l app=nginx
NAME                     READY   STATUS    RESTARTS   AGE   LABELS
nginx-64c5bdd48d-49r5f   1/1     Running   0          16h   app=nginx,pod-template-hash=64c5bdd48d
nginx-64c5bdd48d-v7nfl   1/1     Running   0          16h   app=nginx,pod-template-hash=64c5bdd48d

查询多个label的Pod

$ kubectl get pods --show-labels -l 'k8s-app in (calico-kube-controllers,metrics-server)' -A
NAMESPACE     NAME                                       READY   STATUS    RESTARTS   AGE   LABELS
kube-system   calico-kube-controllers-756dd4db79-hxwpp   1/1     Running   0          37h   k8s-app=calico-kube-controllers,pod-template-hash=756dd4db79
kube-system   metrics-server-b7cff9c67-c4w6l             1/1     Running   0          39m   k8s-app=metrics-server,pod-template-hash=b7cff9c67

Label删除

$ kubectl label node node1 app-