[caoxianfei1]

1. start chunkserver
   Curveadm migrate topology.yaml

NOTICE: cluster 'bs' is about to migrate services:
  - Migrate services: chunkserver*1
  - Migrate host: from curve16 to curve21
Do you want to continue? [yes/no]: (default=no) yes
Backup Etcd Data: [OK]  
  + host=curve7   role=etcd  containerId=f5e2895d99cb [1/1] [OK]  
  + host=curve15  role=etcd  containerId=6a4df2b16392 [1/1] [OK]  
  + host=curve16  role=etcd  containerId=deee16d5fd10 [1/1] [OK]  

Create Physical Pool: [OK]  
  + host=curve7  role=mds  containerId=b206cb859b15 [1/1] [OK]  

Pull Image: [OK]  
  + host=curve21  image=quay.io/opencurve/curve/curvebs:v1.2.7-rc1_0ff8409 [1/1] [OK]  

Create Container: [OK]  
  + host=curve21  role=chunkserver [1/1] [OK]  

Sync Config: [OK]  
  + host=curve21  role=chunkserver  containerId=c99b311c54ec [1/1] [OK]  

Start Service: [OK]  
  + host=curve21  role=chunkserver  containerId=c99b311c54ec [1/1] [OK]  

Mark Chunkserver Pendding: [OK]  
  + host=curve7  role=mds  containerId=b206cb859b15 [1/1] [OK]  

Services successfully migrateed ^_^.

2. clean the old container and update topology
   curveadm migrate topology.yaml --clean

Stop Service: [SKIP]  
  + host=curve16  role=chunkserver  containerId=- [1/1] [SKIP]  

Clean Service: [OK]  
  + host=curve16  role=chunkserver  containerId=-  clean=container [1/1] [OK]  

Create Physical Pool: [OK]  
  + host=curve7  role=mds  containerId=b206cb859b15 [1/1] [OK]  

Update Topology: [OK] 

Here maybe need to wait a few more seconds and clean again.