# 2021-06-23-17:30:00+0800 replace cloudchat monitor machine
- Cause: tidbmonitor is intermittent down
- Operation: 
```

1.KUBECONFIG=/tmp/4bc76ea kubectl taint nodes -l  worker.gardener.cloud/pool=master memory=toosmall:NoExecute

2.kubectl edit shoot  4bc76ea -n garden-prod
  - machine:
        image:
          name: centos-v20210420
          version: 7.8.2003
        type: m5.2xlarge
      maxSurge: 1
      maxUnavailable: 0
      maximum: 1
      minimum: 1
      name: master
      volume:
        size: 50Gi
        type: gp2
      zones:
      - ap-northeast-2a  // tidbmonitor is in 2a zone 

3.KUBECONFIG=/tmp/4bc76ea edit tidbmonitor db -n tidb1311285575352848384       
    resources:
       limit:
         memory: 24G
```
- Impact: Controller plane will restart and TiDBMonitor will restart 
- Recovery operation: NONE
- Time window: 2021-06-23-17:30:40+0800 ~ 2021-06-23-17:50:40+0800