# 2022-02-23-14:54:25+0800 Scale out colopl pd dev cluster node

- Cause:
https://jira.tidbcloud.com/browse/TCOC-268

To avoid PD single point of failure, we need to scale out PD node

- Operation:

1. Backup cluster config

```bash
kubectl cluster -n prod-1372813089188121303 1379661944581004071 -oyaml > 1379661944581004071.yaml
kubectl cluster -n prod-1372813089188181294 1379661944581754072 -oyaml > 1379661944581754072.yaml
```

3. update tidb cluster config to set pd replica to 3 for cluster tidb1379661944581004071, tidb1379661944581754072

```bash
kubectl edit cluster -n prod-1372813089188121303 1379661944581004071 
kubectl edit cluster -n prod-1372813089188181294 1379661944581754072 
```

- Impact:

It will add two extra nodes for PD

- Recovery operation:

N/A

- Time window:

2022-02-23 15:00 ~ 16:00