1、问题如下：

创建完docker swarm将myvm3 node主机加入swarm中，执行以下命令时：

#root@zzw-C6100:/var/lib/docker/service-zzw# docker-machine ssh myvm3 "docker swarm join --token SWMTKN-1-2wutdtn22qqhl53wizuo4oavlmnwc9jhg1kxpzbxm2jeele44b-6fwtiplwvemsdmiflqllumufk 192.168.99.102:2377"

报错如下：

Error response from daemon: rpc error: code = Unavailable desc = all SubConns are in TransientFailure, latest connection error: connection error: desc = "transport: Error while dialing dial tcp 192.168.99.102:2377: connect: connection refused"

2、错误原因：

 错误原因是如下的 docker swarm join 命令中的 ip 地址应该为 swarm manager 节点的ip地址与端口；

$ docker-machine ssh myvm2 "docker swarm join --token <token> <ip>:2377

3、解决方法：

 修改swarm join命令如下即可：

#root@zzw-C6100:/var/lib/docker/service-zzw# docker-machine --native-ssh ssh myvm3 "docker swarm join --token SWMTKN-1-2wutdtn22qqhl53wizuo4oavlmnwc9jhg1kxpzbxm2jeele44b-6fwtiplwvemsdmiflqllumufk 192.168.99.100:2377"