Docker 中 systemctl 命令不好使 (以 firewalld 爲例)

以 firewalld 爲例.

1. 問題

安裝完 firewall, 發現 systemctl start firewalld 報錯.

yum install firewalld

報錯:
System has not been booted with systemd as init system (PID 1). Can’t operate. Failed to connect to bus: Host is down

2. 解決

運行容器時, 添加兩個參數:
--privileged=true
/usr/sbin/init

docker run -d -it --privileged=true --name centos centos /usr/sbin/init

由於運行是添加了 /usr/sbin/init 參數, 進入容器時用 /bin/bash 即可.

docker exec -it centos /bin/bash

此時再運行 systemctl start firewalld 便可以成功.