hurongchengs-mac:centos7-three-node hrc$ vagrant ssh swarm-worker1
[vagrant@swarm-worker1 ~]$ docker swarm join --token SWMTKN-1-2y7di7d8l28op7bdirfaq5tt6iwydimfb0kmy50waikok19cyf-50nnuf6563ua22g4cfnpyq55x 192.168.205.10:2377
Error response from daemon: rpc error: code = Unavailable desc = grpc: the connection is unavailable
[vagrant@swarm-worker1 ~]$ telnet 192.168.205.10 2377
Trying 192.168.205.10...
telnet: connect to address 192.168.205.10: Connection refused

在worker1中使用telnet测试swarm-manager的2377端口，链接拒绝。关闭了两台机器的防火墙仍有问题。

这是vagrant@swarm-manager上swarm manager节点：

[vagrant@swarm-manager ~]$ docker swarm init --advertise-addr=192.168.205.10
Swarm initialized: current node (f035qwdaq93caxjbo5dwxvjmc) is now a manager.

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

    docker swarm join --token SWMTKN-1-2y7di7d8l28op7bdirfaq5tt6iwydimfb0kmy50waikok19cyf-50nnuf6563ua22g4cfnpyq55x 192.168.205.10:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
[vagrant@swarm-manager ~]$ docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
f035qwdaq93caxjbo5dwxvjmc *   swarm-manager       Ready               Active              Leader              18.03.0-ce

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