k8s入门

k8s入门

ReplicaSet是下一代Replication Controller。 现在，ReplicaSet和Replication Controller之间的唯一区别是selector支持。 ReplicaSet支持标签用户指南中描述的新的基于集合的选择器要求，而Replication Controller仅支持基于等级的选择器要求。

在开始之前，删除之前创建的RC

[root@k8s-01 ~]# kubectl delete rc nginx-rc 
replicationcontroller "nginx-rc" deleted

编写RS的YAML文件

[root@k8s-01 ~]# cat nginx-rs.yaml 
apiVersion: apps/v1
kind: ReplicaSet
metadata:name: nginx-rslabels:app: nginx
spec:replicas: 3selector:matchLabels:app: nginxtemplate:metadata:labels:app: nginxspec:containers:- name: nginximage: nginxports:- containerPort: 80

这是一个ReplicaSet类型的。

创建RS

[root@k8s-01 ~]# kubectl create -f nginx-rs.yaml 
replicaset.apps/nginx-rs created

查看RS

[root@k8s-01 ~]# kubectl get rs nginx-rs
NAME       DESIRED   CURRENT   READY   AGE
nginx-rs   3         3         3       29s

查看Pod

[root@k8s-01 ~]# kubectl get pod
NAME                        READY   STATUS    RESTARTS   AGE
nginx-rs-g9chx              1/1     Running   0          59s
nginx-rs-h6f7k              1/1     Running   0          59s
nginx-rs-lwcbf              1/1     Running   0          59s

扩容和缩容

[root@k8s-01 ~]# kubectl scale rs nginx-rs --replicas=2 
replicaset.apps/nginx-rs scaled[root@k8s-01 ~]# kubectl get pod
NAME                        READY   STATUS    RESTARTS   AGE
nginx-rs-g9chx              1/1     Running   0          10m
nginx-rs-h6f7k              1/1     Running   0          10m[root@k8s-01 ~]# kubectl get rs
NAME                  DESIRED   CURRENT   READY   AGE
nginx-rs              2         2         2       10m[root@k8s-01 ~]# kubectl scale rs nginx-rs --replicas=4 
replicaset.apps/nginx-rs scaled[root@k8s-01 ~]# kubectl get pod
NAME                        READY   STATUS              RESTARTS   AGE
nginx-rs-g9chx              1/1     Running             0          10m
nginx-rs-ghz7l              1/1     Running             0          7s
nginx-rs-h6f7k              1/1     Running             0          10m
nginx-rs-j5d4p              0/1     ContainerCreating   0          7s[root@k8s-01 ~]# kubectl get rs
NAME                  DESIRED   CURRENT   READY   AGE
nginx-rs              4         4         4       11m

参考文章：
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