设置k8s中节点node的ROLES值

1. 现象

4个node节点有1个的ROLES是 看上去就很不协调

root@ks-master:~# kubectl get node
NAME        STATUS   ROLES                         AGE   VERSION
ks-master   Ready    control-plane,master,worker   45d   v1.21.5
ks-node1    Ready    worker                        45d   v1.21.5
ks-node2    Ready    worker                        45d   v1.21.5
ks-node3    Ready    worker                        25d   v1.21.5
ks-node4    Ready    <none>                        9d    v1.21.5

2. 解决方法

其实这个Roles就是一个标签,执行以下命令给ks-node4打上worker标签

kubectl label node ks-node4 kubernetes.io/role=worker

此时查看node的标签,ks-node4已经是worker

root@ks-master:~# kubectl label node ks-node4 kubernetes.io/role=worker
node/ks-node4 labeled

root@ks-master:~# kubectl get node
NAME        STATUS   ROLES                         AGE   VERSION
ks-master   Ready    control-plane,master,worker   45d   v1.21.5
ks-node1    Ready    worker                        45d   v1.21.5
ks-node2    Ready    worker                        45d   v1.21.5
ks-node3    Ready    worker                        25d   v1.21.5
ks-node4    Ready    worker                        9d    v1.21.5

master有3个标签,那应该怎么搞呢?

root@ks-master:~# kubectl label node ks-node4 node-role.kubernetes.io/node=
node/ks-node4 labeled

root@ks-master:~# kubectl get node
NAME        STATUS   ROLES                         AGE   VERSION
ks-master   Ready    control-plane,master,worker   45d   v1.21.5
ks-node1    Ready    worker                        45d   v1.21.5
ks-node2    Ready    worker                        45d   v1.21.5
ks-node3    Ready    worker                        25d   v1.21.5
ks-node4    Ready    node,worker                   9d    v1.21.5

此时ks-node4已经有了2个标签
那么再移除这个node标签

root@ks-master:~# kubectl label node ks-node4 node-role.kubernetes.io/node-
node/ks-node4 labeled

root@ks-master:~# kubectl get node
NAME        STATUS   ROLES                         AGE   VERSION
ks-master   Ready    control-plane,master,worker   45d   v1.21.5
ks-node1    Ready    worker                        45d   v1.21.5
ks-node2    Ready    worker                        45d   v1.21.5
ks-node3    Ready    worker                        25d   v1.21.5
ks-node4    Ready    worker                        9d    v1.21.5