分享一个docker无法启动的小问题

准备看看docker服务怎么样

[root@localhost ~]# docker ps
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

这一看就是docker的进程崩了，我们启动下进程

[root@localhost ~]# systemctl start docker
Failed to start docker.service: Unit is not loaded properly: Bad message.
See system logs and 'systemctl status docker.service' for details.

启动不了，我们运行下 systemctl status docker.service 看看报错

[root@localhost ~]# systemctl status docker.service
● docker.service
   Loaded: error (Reason: Bad message)
   Active: inactive (dead)
 
Sep 16 08:32:02 localhost.localdomain systemd[1]: [/usr/lib/systemd/system/docker.service:1] Invalid secti...nit'
Sep 16 08:32:02 localhost.localdomain systemd[1]: Cannot add dependency job for unit docker.service, ignor...age.
Hint: Some lines were ellipsized, use -l to show in full.
[root@localhost ~]# vim /usr/lib/systemd/system/docker.service
[root@localhost ~]# systemctl status docker.service
● docker.service
   Loaded: error (Reason: Bad message)
   Active: inactive (dead)
Sep 16 08:32:02 localhost.localdomain systemd[1]: [/usr/lib/systemd/system/docker.service:1] Invalid secti...nit'
Sep 16 08:32:02 localhost.localdomain systemd[1]: Cannot add dependency job for unit docker.service, ignor...age.
Hint: Some lines were ellipsized, use -l to show in full.

这些日志显示了 Docker 服务启动问题的原因。第一行提到了 /usr/lib/systemd/system/docker.service 文件的第一行存在一个 "Invalid section header" 错误。这意味着 systemd 在解析该文件时发现了问题。

我们打开 docker.service文件看看第一行

打开的时候发现第一行是  [Unit

缺了一个括号，我们补上

保存退出后再次运行看看

[root@localhost ~]# systemctl start docker
Failed to start docker.service: Unit is not loaded properly: Bad message.
See system logs and 'systemctl status docker.service' for details.

还是显示这个问题

突然想起重载下配置文件

systemctl daemon-reload

再次运行

systemctl start docker

服务正常启动

[root@localhost ~]# docker ps
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES

可以查看服务了（服务就不展示了）