一、rc控制器常用命令
1、rc控制器信息查看
[root@k8s-master ~]# kubectl get replicationcontroller
NAME DESIRED CURRENT READY AGE
myweb 3 3 3 3m
[root@k8s-master ~]# kubectl get rc
NAME DESIRED CURRENT READY AGE
myweb 3 3 3 5m
2、删除rc
[root@k8s-master ~]# kubectl delete rc myweb
replicationcontroller "myweb" deleted
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 1h
nginx2 1/1 Running 0 24m
二、服务发现和负载均衡
1、修改nginx2的标签名为：myweb
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
myweb-cbt47 1/1 Running 0 4m
myweb-fhfgs 1/1 Running 0 4m
myweb-fltnm 1/1 Running 0 4m
nginx 1/1 Running 0 1h
nginx2 1/1 Running 0 30m [root@k8s-master ~]# kubectl edit pod nginx2 #app: myweb 修改nginx的标签名为：myweb
pod "nginx2" edited
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
myweb-cbt47 1/1 Running 0 8m
myweb-fltnm 1/1 Running 0 8m
nginx 1/1 Running 0 1h
nginx2 1/1 Running 0 33m
2、咋突然少了一个容器？
[root@k8s-master ~]# kubectl describe pod nginx2 #Labels: app=web
Name: nginx2
Namespace: default
Node: k8s-node2/10.0.128.2
Start Time: Sun, 20 Jan 2019 14:06:50 +0800
Labels: app=web
Status: Running
IP: 172.16.48.2 [root@k8s-master ~]# kubectl describe pod myweb-cbt47 #Labels: app=myweb
Name: myweb-cbt47
Namespace: default
Node: k8s-node2/10.0.128.2
Start Time: Sun, 20 Jan 2019 14:32:19 +0800
Labels: app=myweb
Status: Running
IP: 172.16.48.3
Controllers: ReplicationController/myweb
3、小结
1、因为控制器设置最少保持3个副本
2、rc控制器是根据Labels 来区分组别的
2、nginx2的标签和myweb控制器的标签一样，所以就删除了存活时间最短的容器
三、动态修改rc副本数量
1、修改为2
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
myweb-cbt47 1/1 Running 0 9m
myweb-fltnm 1/1 Running 0 9m
nginx 1/1 Running 0 1h
nginx2 1/1 Running 0 35m [root@k8s-master ~]# kubectl edit rc myweb
replicas: 2
replicationcontroller "myweb" edited
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
myweb-cbt47 1/1 Running 0 11m
nginx 1/1 Running 0 1h
nginx2 1/1 Running 0 36m
2、修改为5
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
myweb-cbt47 1/1 Running 0 11m
nginx 1/1 Running 0 1h
nginx2 1/1 Running 0 36m
[root@k8s-master ~]# kubectl edit rc myweb
replicas: 5
replicationcontroller "myweb" edited
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
myweb-7w38b 0/1 ContainerCreating 0 3s
myweb-btflm 1/1 Running 0 3s
myweb-cbt47 1/1 Running 0 12m
myweb-rt3b9 0/1 ContainerCreating 0 3s
nginx 1/1 Running 0 1h
nginx2 1/1 Running 0 38m