How do followers become the leader?

[Anoning]

When I close the leader's terminal, the followers' terminals are also closed.

`$GOPATH/bin/raftd -id node03 -haddr raft-cluster-host-03:8091 -raddr raft-cluster-host-03:8089 -join raft-cluster-host-01:8091 ~/.raftdb

2022-06-17T14:28:19.959+0800 [INFO] raft: initial configuration: index=1 servers="[{Suffrage:Voter ID:node01 Address:127.0.0.2:8089}]"
[store] 2022/06/17 14:28:19 no bootstrap needed
2022-06-17T14:28:19.959+0800 [INFO] raft: entering follower state: follower="Node at 127.0.0.4:8089 [Follower]" leader=
2022/06/17 14:28:19 failed to join node at raft-cluster-host-01:8091: Post "http://raft-cluster-host-01:8091/join": dial tcp 127.0.0.2:8091: connect: connection refused
`

I don't know if there is something wrong with my operation. If this part is implemented, what should I do?

Thank you very much！