无法启动MariaDB数据库服务器

由于/分区只有50G，并且我的数据比那更大。 /home有500G空间。 所以，我把MySQL的所有数据移到/home 。 以下是我的步骤（在root帐户下）：

1. 喊下MySQL

   # mysql -u root -p shutdown

2. 制作data目录。

   • LDAP远程login日志
   • 奇怪的smartctl输出。 我的磁盘有危险吗？
   • 检查iptables规则是否正在工作
   • DL585，HP Proliant G5服务器闪烁内部健康指示灯红色
   • 模拟海量networkingstream量

   # cd /home/ && mkdir data

3. 将/var/lib/mysql目录移动到/home/data

   # mv /var/lib/mysql /home/data/

4. 编辑my.cnf和/usr/lib64/mysql/mysql_config

   将socket=/var/lib/mysql/mysql.sock更改为socket=/home/data/mysql/mysql.sock

   仅在my.cnf [mysqldb]部分添加datadir=/home/data/mysql

5. ln -s

   首先我在/var/lib/创build了一个名为mysql的目录。 和chown mysql:mysql /var/lib/mysqlbuild立连接： ln -s /home/data/mysql/mysql.sock /var/lib/mysql/mysql.sock

6. 更改/home/data/mysql所有者

   chown -R mysql:mysql /home/data/mysql/

7. 启动MySQL服务

   # systemctl start mariadb.service

但是，它开始失败。

 [root@localhost]~# systemctl start mariadb.service Job for mariadb.service failed because the control process exited with error code. See "systemctl status mariadb.service" and "journalctl -xe" for details. 

详细的信息是：

 [root@localhost]~# systemctl status mariadb.service ● mariadb.service - MariaDB database server Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled; vendor preset: disabled) Active: failed (Result: exit-code) since Thu 2016-04-21 19:51:13 HKT; 39s ago Process: 7144 ExecStartPost=/usr/libexec/mariadb-wait-ready $MAINPID (code=exited, status=1/FAILURE) Process: 7143 ExecStart=/usr/bin/mysqld_safe --basedir=/usr (code=exited, status=0/SUCCESS) Process: 7090 ExecStartPre=/usr/libexec/mariadb-prepare-db-dir %n (code=exited, status=0/SUCCESS) Main PID: 7143 (code=exited, status=0/SUCCESS) Apr 21 19:51:12 localhost.localdomain systemd[1]: Starting MariaDB database server... Apr 21 19:51:12 localhost.localdomain mysqld_safe[7143]: 160421 19:51:12 mysqld_safe Logging to '/home/data/mysql/localhost.localdomain.err'. Apr 21 19:51:12 localhost.localdomain mysqld_safe[7143]: 160421 19:51:12 mysqld_safe Starting mysqld daemon with databases from /home/data/mysql Apr 21 19:51:12 localhost.localdomain mysqld_safe[7143]: 160421 19:51:12 mysqld_safe mysqld from pid file /home/data/mysql/localhost.localdomain.pid ended Apr 21 19:51:13 localhost.localdomain systemd[1]: mariadb.service: control process exited, code=exited status=1 Apr 21 19:51:13 localhost.localdomain systemd[1]: Failed to start MariaDB database server. Apr 21 19:51:13 localhost.localdomain systemd[1]: Unit mariadb.service entered failed state. Apr 21 19:51:13 localhost.localdomain systemd[1]: mariadb.service failed. [root@localhost]~# journalctl -xe -- The start-up result is done. Apr 21 19:50:01 localhost.localdomain systemd[1]: Starting Session 7 of user root. -- Subject: Unit session-7.scope has begun start-up -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit session-7.scope has begun starting up. Apr 21 19:50:01 localhost.localdomain CROND[6971]: (root) CMD (/usr/lib64/sa/sa1 1 1) Apr 21 19:51:12 localhost.localdomain polkitd[900]: Registered Authentication Agent for unix-process:7084:268964 (system bus name :1.80 [/usr/bin/pkttyagent Apr 21 19:51:12 localhost.localdomain systemd[1]: Starting MariaDB database server... -- Subject: Unit mariadb.service has begun start-up -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit mariadb.service has begun starting up. Apr 21 19:51:12 localhost.localdomain mysqld_safe[7143]: 160421 19:51:12 mysqld_safe Logging to '/home/data/mysql/localhost.localdomain.err'. Apr 21 19:51:12 localhost.localdomain mysqld_safe[7143]: 160421 19:51:12 mysqld_safe Starting mysqld daemon with databases from /home/data/mysql Apr 21 19:51:12 localhost.localdomain mysqld_safe[7143]: 160421 19:51:12 mysqld_safe mysqld from pid file /home/data/mysql/localhost.localdomain.pid ended Apr 21 19:51:13 localhost.localdomain systemd[1]: mariadb.service: control process exited, code=exited status=1 Apr 21 19:51:13 localhost.localdomain systemd[1]: Failed to start MariaDB database server. -- Subject: Unit mariadb.service has failed -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit mariadb.service has failed. -- -- The result is failed. Apr 21 19:51:13 localhost.localdomain systemd[1]: Unit mariadb.service entered failed state. Apr 21 19:51:13 localhost.localdomain systemd[1]: mariadb.service failed. Apr 21 19:51:13 localhost.localdomain polkitd[900]: Unregistered Authentication Agent for unix-process:7084:268964 (system bus name :1.80, object path /org/f lines 3132-3161/3161 (END) 

我的操作系统是CentOS 7 ，MySQL是MariaDB 。

如何解决它？ 谢谢！

 tail -f /var/log/messages