pod原地扩缩容如何使用

背景

k8s最新版本支持pod原地扩缩容了,这边简单记录一下如何命令行使用

示例

创建demo pod

apiVersion: v1
kind: Pod
metadata:
 name: demo
spec:
 containers:
 - name: app
   image: nginx
   imagePullPolicy: IfNotPresent
   resizePolicy:
   - resourceName: cpu
     restartPolicy: NotRequired
   - resourceName: memory
     restartPolicy: NotRequired
   resources:
     requests:
       memory: "128Mi"
       cpu: "100m"
     limits:
       memory: "128Mi"
       cpu: "100m"

验证当前资源

查看cpu

kubectl exec -it demo -- cat /sys/fs/cgroup/cpu.max

得到

10000 100000

修改资源

kubectl patch pod demo --subresource=resize  --patch  '{"spec":{"containers":[{"name":"app", "resources":{"requests":{"cpu":"300m"}, "limits":{"cpu":"300m"}}}]}}'

验证当前资源

查看cpu

kubectl exec -it demo -- cat /sys/fs/cgroup/cpu.max

得到

30000 100000