報錯信息

登陸數據庫報錯：`

ERROR 2002 (HY000): Can‘t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock‘ (2 "No such file or directory")`

重啟服務報錯：Job for mariadb.service failed because the control process exited with error code. See "systemctl status mariadb.service" and "journalctl -xe" for details.

查看服務狀態信息：`systemctl status mariadb.service

● mariadb.service - MariaDB 10.1 database server

Loaded: loaded (/usr/lib/systemd/system/mariadb.service; disabled; vendor preset: disabled)

Active: failed (Result: exit-code) since Mon 2019-04-15 17:16:38 UTC; 4s ago

Process: 2864 ExecStartPre=/usr/libexec/mysql-prepare-db-dir %n (code=exited, status=1/FAILURE)

Process: 2841 ExecStartPre=/usr/libexec/mysql-check-socket (code=exited, status=0/SUCCESS)

Apr 15 17:16:37 xiandian systemd[1]: Starting MariaDB 10.1 database server...

Apr 15 17:16:38 xiandian mysql-prepare-db-dir[2864]: Database MariaDB is not initialized, but the directory /var/lib/mysql is not empty...e done.

Apr 15 17:16:38 xiandian mysql-prepare-db-dir[2864]: Make sure the /var/lib/mysql is empty before running mysql-prepare-db-dir.

Apr 15 17:16:38 xiandian systemd[1]: mariadb.service: control process exited, code=exited status=1

Apr 15 17:16:38 xiandian systemd[1]: Failed to start MariaDB 10.1 database server.

Apr 15 17:16:38 xiandian systemd[1]: Unit mariadb.service entered failed state.

Apr 15 17:16:38 xiandian systemd[1]: mariadb.service failed.

Hint: Some lines were ellipsized, use -l to show in full.`

重啟服務日志報錯信息：`Apr 15 17:16:21 xiandian mysql-prepare-db-dir: Database MariaDB is not initialized, but the directory /var/lib/mysql is not empty, so initialization cannot be done.

Apr 15 17:16:21 mysql-prepare-db-dir: Make sure the /var/lib/mysql is empty before running mysql-prepare-db-dir.

Apr 15 17:16:21 systemd: mariadb.service: control process exited, code=exited status=1

Apr 15 17:16:21 systemd: Failed to start MariaDB 10.1 database server.

Apr 15 17:16:21 systemd: Unit mariadb.service entered failed state.

Apr 15 17:16:21 systemd: mariadb.service failed.`

可以看到報錯信息中提示數據庫未初始化，但/var/lib/mysql不為空，所以無法進行初始化。

去看一下這個目錄權限

ll /var/lib/

d---------. 11 mysql mysql 4096 May 4 2018 mysql

mysql權限為0，導致啟動文件sock文件無法寫入進去

重啟賦予目錄權限為755

chmod 755 /var/lib/mysql/然后再重啟一下mysql服務systemctl restart mariadb.serviceps -e | grep -i mysql3191 ? 00:00:02 mysqld正常啟動

總結

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