无法将控制器副本添加到现有UCP群集

Question

我有UCP集群，有3个控制器和3个常规节点。我第一次成功设置了集群。 但是，我试图在其中一个控制器上进行全新安装，但运行join命令时出现以下错误：

a
INFO[0001] Verifying your system is compatible with UCP
INFO[0001] Checking that required ports are available and accessible
INFO[0117] Starting local swarm containers
INFO[0120] Starting UCP Controller replica containers
ERRO[0120] Server response: {"message":"etcdserver: peerURL exists"}
ERRO[0120] Failed to start KV store.  Run "docker logs ucp-kv" for more details
FATA[0120] Failed to add member to KV store: {"message":"etcdserver: peerURL exists"}

我正在运行以下join命令：

docker run --rm -it \
  --name ucp \
  -v /var/run/docker.sock:/var/run/docker.sock \
  docker/ucp:1.1.3 \
  join --replica --interactive