RHEL 升级到 7.2 后无法启动 MySQL，未注册身份验证代理

Question

我刚刚将 RHEL 系统从 6.7 升级到 7.2，再次启动 MySQL 时遇到问题。

当运行:

# systemctl start mysqld

我收到这个错误：

Job for mysqld.service failed because the control process exited with error code. 
See "systemctl status mysqld.service" and "journalctl -xe" for details.

systemctl status 告诉我以下内容：

● mysqld.service - SYSV: MySQL database server.
   Loaded: loaded (/etc/rc.d/init.d/mysqld)
   Active: failed (Result: exit-code) since Tue 2017-05-02 10:00:52 CDT; 59s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 21827 ExecStart=/etc/rc.d/init.d/mysqld start (code=exited, status=1/FAILURE)

May 02 10:00:51 sa-dnca01.zs.local systemd[1]: Starting SYSV: MySQL database server....
May 02 10:00:52 sa-dnca01.zs.local mysqld[21827]: MySQL Daemon failed to start.
May 02 10:00:52 sa-dnca01.zs.local mysqld[21827]: Starting mysqld:  [FAILED]
May 02 10:00:52 sa-dnca01.zs.local systemd[1]: mysqld.service: control process exited, code=exited status=1
May 02 10:00:52 sa-dnca01.zs.local systemd[1]: Failed to start SYSV: MySQL database server..
May 02 10:00:52 sa-dnca01.zs.local systemd[1]: Unit mysqld.service entered failed state.
May 02 10:00:52 sa-dnca01.zs.local systemd[1]: mysqld.service failed.

然后 journalctl -xe 告诉我以下内容：

May 02 10:03:09 sa-dnca01.zs.local polkitd[768]: Registered Authentication Agent for unix-process:22276:29249716 (system bus name :1.30 [/usr/bin/
May 02 10:03:09 sa-dnca01.zs.local systemd[1]: Starting SYSV: MySQL database server....
-- Subject: Unit mysqld.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit mysqld.service has begun starting up.
May 02 10:03:10 sa-dnca01.zs.local mysqld[22281]: MySQL Daemon failed to start.
May 02 10:03:10 sa-dnca01.zs.local mysqld[22281]: Starting mysqld:  [FAILED]
May 02 10:03:10 sa-dnca01.zs.local systemd[1]: mysqld.service: control process exited, code=exited status=1
May 02 10:03:10 sa-dnca01.zs.local systemd[1]: Failed to start SYSV: MySQL database server..
-- Subject: Unit mysqld.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit mysqld.service has failed.
--
-- The result is failed.
May 02 10:03:10 sa-dnca01.zs.local systemd[1]: Unit mysqld.service entered failed state.
May 02 10:03:10 sa-dnca01.zs.local systemd[1]: mysqld.service failed.
May 02 10:03:10 sa-dnca01.zs.local polkitd[768]: Unregistered Authentication Agent for unix-process:22276:29249716 (system bus name :1.30, object

我真的不知道这意味着什么，但在服务器进行 OS 升级之前，我确实有一个成功的运行 MySQL 服务器。

Answer 1

原来我收到这个错误是因为我没有在以下位置创建必要的日志记录目录：

/var/run/mysqld

并赋予它适当的权限。

查看 /var/log/mysqld.log 中的日志文件让我想到了这个问题。

RHEL 升级到 7.2 后无法启动 MySQL，未注册身份验证代理

Can't start MySQL after RHEL upgrade to 7.2, Unregistered Authentication Agent

mysql

rhel

rhel7