mariadb.service：无法设置挂载命名空间：权限被拒绝/在 NAMESPACE 生成步骤中失败

我刚刚安装了 MariaDB，状态是：

* mariadb.service - MariaDB 10.3.18 database server
   Loaded: loaded (/lib/systemd/system/mariadb.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Tue 2020-01-28 15:29:00 UTC; 2s ago
     Docs: man:mysqld(8)
           https://mariadb.com/kb/en/library/systemd/

Jan 28 15:29:00 54 systemd[1]: Starting MariaDB 10.3.18 database server...
Jan 28 15:29:00 54 systemd[29206]: mariadb.service: Failed to set up mount namespacing: Permission denied
Jan 28 15:29:00 54 systemd[29206]: mariadb.service: Failed at step NAMESPACE spawning /usr/bin/install: Permission denied
Jan 28 15:29:00 54 systemd[1]: mariadb.service: Control process exited, code=exited, status=226/NAMESPACE
Jan 28 15:29:00 54 systemd[1]: mariadb.service: Failed with result 'exit-code'.
Jan 28 15:29:00 54 systemd[1]: Failed to start MariaDB 10.3.18 database server.

我可以得到一些启动 MariaDB 的帮助吗 谢谢

这个问题已经很老了 - 但由于我在遇到同样的问题后通过谷歌找到了它，这是我的解决方案：

该问题是在更新 LXC 容器内运行的 MariaDB 实例后开始出现的。

作为快速修复，我创建了/etc/systemd/system/mariadb.service.d/lxc.conf包含以下内容：

[Service]
ProtectHome=false
ProtectSystem=false

# These settings turned out to not be necessary in my case, but YMMV
#PrivateTmp=false
#PrivateNetwork=false
#PrivateDevices=false

之后，运行systemctl daemon-reload and systemctl restart mariadb一切都应该恢复正常。