1.

目前是三个pod

[[email protected] service_pod]# kubectl get pod

NAME? ? ? ? ? ? ? ? ? ?? READY? ?? STATUS? ? RESTARTS?? AGE

mysql-5bbbf49b4f-p7zkz?? 1/1? ? ?? Running?? 0? ? ? ? ? 2m

mysql-5bbbf49b4f-vhj44?? 1/1? ? ?? Running?? 1? ? ? ? ? 2m

mysql-5bbbf49b4f-xzpwn?? 1/1? ? ?? Running?? 1? ? ? ? ? 2m

[[email protected] service_pod]#

想扩大到5个pod

官方参考命令格式，见下：

Examples:

? # Scale a replicaset named ‘foo‘ to 3.

? kubectl scale --replicas=3 rs/foo

? # Scale a resource identified by type and name specified in "foo.yaml" to 3.

? kubectl scale --replicas=3 -f foo.yaml

? # If the deployment named mysql‘s current size is 2, scale mysql to 3.

? kubectl scale --current-replicas=2 --replicas=3 deployment/mysql

? # Scale multiple replication controllers.

? kubectl scale --replicas=5 rc/foo rc/bar rc/baz

? # Scale statefulset named ‘web‘ to 3.

? kubectl scale --replicas=3 statefulset/web

2.

减少pod

测试下参考命令

[[email protected] service_pod]# kubectl get deployment

NAME? ? ? DESIRED?? CURRENT?? UP-TO-DATE?? AVAILABLE?? AGE

mysql? ?? 3? ? ? ?? 3? ? ? ?? 3? ? ? ? ? ? 3? ? ? ? ?? 9m

[[email protected] service_pod]# kubectl scale --current-replicas=3 --replicas=1 deployment/mysql

deployment.extensions "mysql" scaled

[[email protected] service_pod]# kubectl get deployment

NAME? ? ? DESIRED?? CURRENT?? UP-TO-DATE?? AVAILABLE?? AGE

mysql? ?? 1? ? ? ?? 1? ? ? ?? 1? ? ? ? ? ? 1? ? ? ? ?? 10m

3.

增加pod

测试下命令

[[email protected] service_pod]# kubectl get deployment

NAME? ? ? DESIRED?? CURRENT?? UP-TO-DATE?? AVAILABLE?? AGE

mysql? ?? 1? ? ? ?? 1? ? ? ?? 1? ? ? ? ? ? 1? ? ? ? ?? 13m

[[email protected] service_pod]# kubectl scale --current-replicas=1 --replicas=3 deployment/mysql

deployment.extensions "mysql" scaled

[[email protected] service_pod]# kubectl get pod

NAME? ? ? ? ? ? ? ? ? ?? READY? ?? STATUS? ? RESTARTS?? AGE

mysql-5bbbf49b4f-96v7g?? 1/1? ? ?? Running?? 0? ? ? ? ? 5s

mysql-5bbbf49b4f-f6rlg?? 1/1? ? ?? Running?? 0? ? ? ? ? 5s

mysql-5bbbf49b4f-p7zkz?? 1/1? ? ?? Running?? 0? ? ? ? ? 13m

[[email protected] service_pod]#