Bash
创建一个为demoapp的POD，应用镜像为nginx,副本数为3
[root@master ~]# kubectl create deployment demoapp --image=nginx --replicas=3
deployment.apps/demoapp created
扩展POD的副本数从原来的副本数3，扩展到5
先来查看默认的副本数，这里可以看到demoapp的副本的数量是3个
[root@master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demoapp-79b7d5f68b-2dw6g 1/1 Running 0 2m57s
demoapp-79b7d5f68b-b2rw5 1/1 Running 0 2m57s
demoapp-79b7d5f68b-x4jvx 1/1 Running 0 2m57s
nginx-6799fc88d8-47rfc 1/1 Running 0 82m
nginx-6799fc88d8-kcms7 1/1 Running 0 82m
nginx-6799fc88d8-tp7ff 1/1 Running 0 82m
扩展demoapp的副本数为5个
[root@master ~]# kubectl scale deployment demoapp --replicas=5
deployment.apps/demoapp scaled
查看副本数，是否扩展成功，这里可以看到demoapp的副本数已经为5个了
[root@master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demoapp-79b7d5f68b-2dw6g 1/1 Running 0 7m18s
demoapp-79b7d5f68b-85vrb 1/1 ContainerCreating 0 3s
demoapp-79b7d5f68b-b2rw5 1/1 Running 0 7m18s
demoapp-79b7d5f68b-rj4wn 1/1 ContainerCreating 0 3s
demoapp-79b7d5f68b-x4jvx 1/1 Running 0 7m18s
nginx-6799fc88d8-47rfc 1/1 Running 0 86m
nginx-6799fc88d8-kcms7 1/1 Running 0 86m
nginx-6799fc88d8-tp7ff 1/1 Running 0 86m
吧demoapp的副本数缩容到3个
[root@master ~]# kubectl scale deployment demoapp --replicas=3
deployment.apps/demoapp scaled
查看demoapp的副本数量
[root@master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demoapp-79b7d5f68b-2dw6g 1/1 Running 0 79m
demoapp-79b7d5f68b-b2rw5 1/1 Running 0 79m
demoapp-79b7d5f68b-x4jvx 1/1 Running 0 79m
nginx-6799fc88d8-47rfc 1/1 Running 0 158m
nginx-6799fc88d8-kcms7 1/1 Running 0 158m
nginx-6799fc88d8-tp7ff 1/1 Running 0 158m