Failed to get D-Bus connection: Operation not permitted - CentOS 7

[pineking]

根据 moby/moby#7459

1. 问题：在docker CentOS 7 执行systemctl 命令会报 Failed to get D-Bus connection: No connection to service manager，以 systemctl status systemd-journald 命令为例

liuqs@BlackTurtle:~>docker run -ti centos:7 /bin/bash
[root@7430895f5868 /]# systemctl status systemd-journald
Failed to get D-Bus connection: Operation not permitted

解决方案：采用 /usr/sbin/init 自动启动 dbus daemon

$ docker run --privileged -d -ti -e "container=docker"  -v /sys/fs/cgroup:/sys/fs/cgroup  centos:7  /usr/sbin/init
6dd3234f6c9d3475fd56c2996ab25269d646aca4bde219166b0d4f6c9570046e

$ docker exec -it 6dd323 /bin/bash

[root@6dd3234f6c9d /]# systemctl status systemd-journald
● systemd-journald.service - Journal Service
   Loaded: loaded (/usr/lib/systemd/system/systemd-journald.service; static; vendor preset: disabled)
   Active: active (running) since Sat 2016-07-30 11:35:10 UTC; 2min 22s ago
     Docs: man:systemd-journald.service(8)
           man:journald.conf(5)
 Main PID: 21 (systemd-journal)
   Status: "Processing requests..."
   CGroup: /docker/6dd3234f6c9d3475fd56c2996ab25269d646aca4bde219166b0d4f6c9570046e/system.slice/systemd-journald.service
           └─21 /usr/lib/systemd/systemd-journald

参考：

1. https://github.com/DatawiseIO/c7-systemd-dbus

[pineking]

@wangkuiyi docker 运行 CentOS 7 测试 DHCP/nginx 等服务应该不是我们必须的？实际部署bootstrapper 机应该不是跑在 docker 里？

[wangkuiyi]

@pineking 你说的是。实际部署不在docker里。我引入docker只是为了unit test。

[wangkuiyi]

用VM代替Docker做测试 ( #81 )，希望解决这个问题。

[wangkuiyi]

#81 已经merge了。close这个issue。