# 問題與解決

sudo docker node ls Error response from daemon: rpc error: code = Unknown desc = The swarm does not have a leader. It's possible that too few managers are online. Make sure more than half of the managers are online.

```
sudo docker swarm init --force-new-cluster
Swarm initialized: current node (x0544nvby7gt0zaxp30gjjqov) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-3ltemfcbr4wa71zfctzpzkzzp7wxfijrm17fv7m1u4t60c8gp4-0p5ak00mdqd6flp0d0doa88qy 192.168.43.100:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

```

sduo docker node ls

```
sudo docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
x0544nvby7gt0zaxp30gjjqov *   pi-GB-BSi5A-6200    Ready               Active              Leader              18.09.9
pje55mj8gzj7q8obzz1la5c6s     raspberrypi4        Down                Active                                  19.03.7
vz8vwt7bom9s2go59wtt04lbf     ubuntu-mate         Ready               Active                                  19.03.3

```

![](/files/-M2VbhgeR9YVH7E_m8Wn)

```
sudo docker node rm pje55mj8gzj7q8obzz1la5c6s
```

```
udo docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
x0544nvby7gt0zaxp30gjjqov *   pi-GB-BSi5A-6200    Ready               Active              Leader              18.09.9
vz8vwt7bom9s2go59wtt04lbf     ubuntu-mate         Ready               Active                                  19.03.3
```


---

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