docker - 节点无法加入 Swarm 集群

Question

我有 3 个虚拟机。他们都有docker 1.12并且运行在centos7上。所有端口均已打开并且虚拟机能够互相 ping 通我用

启动了我的集群

docker swarm init --advertise-addr 192.168.140.12

Docker 信息向我展示了:

Swarm: active
 NodeID: 0drcj2nku1mv8t16fxva48edxx
 Is Manager: true
 ClusterID: cchn0yzospwoe1h9f55d7omxx
 Managers: 1
 Nodes: 1

现在我尝试将节点(其他虚拟机)加入集群。我使用启动管理器后推荐的命令。

docker swarm join \
     --token SWMTKN-1-48ythur5k6ckkz90ttlprw37p9z3ldclws51qirw5wdyfmvevr-3sb2t66b2fj6e4dhmfo1vavxx \
     192.168.140.12:2377

但是我得到了:

Error response from daemon: Timeout was reached before node was joined. Attempt to join the cluster will continue in the background. Use "docker info" command to see the current swarm status of your node.

Docker 信息向我展示了:

Swarm: pending
 NodeID:
 Error: rpc error: code = 1 desc = context canceled
 Is Manager: false
 Node Address: 192.168.140.14

在集群管理器上:

# netstat -tulpn | grep docker
tcp6       0      0 :::2377                 :::*                    LISTEN      1602/dockerd
tcp6       0      0 :::7946                 :::*                    LISTEN      1602/dockerd
tcp6       0      0 :::8080                 :::*                    LISTEN      3398/docker-proxy
tcp6       0      0 :::32768                :::*                    LISTEN      3199/docker-proxy
tcp6       0      0 :::32769                :::*                    LISTEN      3219/docker-proxy
tcp6       0      0 :::32770                :::*                    LISTEN      3341/docker-proxy
tcp6       0      0 :::32771                :::*                    LISTEN      3436/docker-proxy
tcp6       0      0 :::2375                 :::*                    LISTEN      1602/dockerd
udp6       0      0 :::7946                 :::*                                1602/dockerd

如何调试此问题或者我是否忘记执行某些重要步骤？服务器之间是否需要 ssh 访问？谢谢

登录节点:

Aug  8 09:50:24 localhost dockerd: time="2016-08-08T09:50:24.393432145-04:00" level=error msg="Handler for POST /v1.24/swarm/leave returned error: This node is not part of swarm"
Aug  8 09:51:01 localhost su: (to root) worker1 on pts/1
Aug  8 09:51:34 localhost dockerd: time="2016-08-08T09:51:34.384408514-04:00" level=error msg="Handler for POST /v1.24/swarm/join returned error: Timeout was reached before node was joined. Attempt to join the cluster will continue in the background. Use \"docker info\" command to see the current swarm status of your node."
Aug  8 09:51:40 localhost su: (to root) worker1 on pts/1
Aug  8 09:52:47 localhost dhclient[1277]: DHCPREQUEST on eno16777736 to 192.168.140.254 port 67 (xid=0x11f8fba8)
Aug  8 09:52:47 localhost dhclient[1277]: DHCPACK from 192.168.140.254 (xid=0x11f8fba8)
Aug  8 09:52:47 localhost NetworkManager[953]: <info>    address 192.168.140.13
Aug  8 09:52:47 localhost NetworkManager[953]: <info>    plen 24 (255.255.255.0)
Aug  8 09:52:47 localhost NetworkManager[953]: <info>    gateway 192.168.140.2
Aug  8 09:52:47 localhost NetworkManager[953]: <info>    server identifier 192.168.140.254
Aug  8 09:52:47 localhost NetworkManager[953]: <info>    lease time 1800
Aug  8 09:52:47 localhost NetworkManager[953]: <info>    nameserver '192.168.140.2'
Aug  8 09:52:47 localhost NetworkManager[953]: <info>    domain name 'localdomain'
Aug  8 09:52:47 localhost NetworkManager[953]: <info>  (eno16777736): DHCPv4 state changed bound -> bound
Aug  8 09:52:47 localhost dbus[878]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
Aug  8 09:52:47 localhost dbus-daemon: dbus[878]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
Aug  8 09:52:47 localhost systemd: Starting Network Manager Script Dispatcher Service...
Aug  8 09:52:47 localhost dhclient[1277]: bound to 192.168.140.13 -- renewal in 713 seconds.
Aug  8 09:52:47 localhost dbus[878]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Aug  8 09:52:47 localhost dbus-daemon: dbus[878]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Aug  8 09:52:47 localhost nm-dispatcher: Dispatching action 'dhcp4-change' for eno16777736
Aug  8 09:52:47 localhost systemd: Started Network Manager Script Dispatcher Service.

有时会出现警告:

level=warning msg="failed to retrieve remote root CA certificate: rpc error: code = 1 desc = context canceled

Answer 1

也许您使用的是 http 代理。

您可以使用以下命令来查看 dockerd 在做什么。

# strace -Fp `pidof dockerd` 2>&1 |grep -v futex |grep -v epoll_wait |grep -v pselect