CentOS 7.4安装mariadb，启动报错
[root@iZ25b6alxstZ ~]# systemctl start mariadb
Job for mariadb.service failed because the control process exited with error code. See "systemctl status mariadb.service" and "journalctl -xe" for details.
[root@iZ25b6alxstZ ~]# systemctl status mariadb
● mariadb.service - MariaDB database server
Loaded: loaded (/usr/lib/systemd/system/mariadb.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Thu 2017-11-30 15:02:35 CST; 4min 10s ago
Process: 14055 ExecStartPost=/usr/libexec/mariadb-wait-ready $MAINPID (code=exited, status=1/F
Process: 14054 ExecStart=/usr/bin/mysqld_safe --basedir=/usr (code=exited, status=0/SUCCESS)
Process: 14024 ExecStartPre=/usr/libexec/mariadb-prepare-db-dir %n (code=exited, status=0/SUCC
Main PID: 14054 (code=exited, status=0/SUCCESS)
Nov 30 15:02:34 iZ25b6alxstZ systemd[1]: Starting MariaDB database server...
Nov 30 15:02:34 iZ25b6alxstZ mariadb-prepare-db-dir[14024]: Database MariaDB is probably initial /var/lib/mysql already, nothing is done.
Nov 30 15:02:34 iZ25b6alxstZ mysqld_safe[14054]: 171130 15:02:34 mysqld_safe Logging to '/var/lodb/mariadb.log'.
Nov 30 15:02:34 iZ25b6alxstZ mysqld_safe[14054]: 171130 15:02:34 mysqld_safe Starting mysqld daeh databases from /var/lib/mysql
Nov 30 15:02:35 iZ25b6alxstZ systemd[1]: mariadb.service: control process exited, code=exited st
Nov 30 15:02:35 iZ25b6alxstZ systemd[1]: Failed to start MariaDB database server.
Nov 30 15:02:35 iZ25b6alxstZ systemd[1]: Unit mariadb.service entered failed state.
Nov 30 15:02:35 iZ25b6alxstZ systemd[1]: mariadb.service failed.
mysql的报错日志如下：
[root@iZ25b6alxstZ ~]# grep 'ERROR' /var/log/mariadb/mariadb.log
171129 11:38:27 [ERROR] Plugin 'InnoDB' init function returned error.
171129 11:38:27 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
171129 11:38:27 [ERROR] mysqld: Out of memory (Needed 128917504 bytes)
171129 11:38:27 [ERROR] mysqld: Out of memory (Needed 96681984 bytes)
171129 11:38:27 [ERROR] Unknown/unsupported storage engine: InnoDB
171129 11:38:27 [ERROR] Aborting
根据报错信息，感觉应该是内存不够了，重启了下机器好了
[root@iZ25b6alxstZ ~]# systemctl status mariadb
● mariadb.service - MariaDB database server
Loaded: loaded (/usr/lib/systemd/system/mariadb.service; disabled; vendor preset: disabled)
Active: active (running) since Thu 2017-11-30 15:11:45 CST; 42s ago
Process: 1218 ExecStartPost=/usr/libexec/mariadb-wait-ready $MAINPID (code=exited, status=0/SUCCESS)
Process: 1187 ExecStartPre=/usr/libexec/mariadb-prepare-db-dir %n (code=exited, status=0/SUCCESS)
Main PID: 1217 (mysqld_safe)
CGroup: /system.slice/mariadb.service
├─1217 /bin/sh /usr/bin/mysqld_safe --basedir=/usr
└─1380 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql...
Nov 30 15:11:42 iZ25b6alxstZ systemd[1]: Starting MariaDB database server...
Nov 30 15:11:42 iZ25b6alxstZ mariadb-prepare-db-dir[1187]: Database MariaDB i...
Nov 30 15:11:42 iZ25b6alxstZ mysqld_safe[1217]: 171130 15:11:42 mysqld_safe ....
Nov 30 15:11:42 iZ25b6alxstZ mysqld_safe[1217]: 171130 15:11:42 mysqld_safe ...l
Nov 30 15:11:45 iZ25b6alxstZ systemd[1]: Started MariaDB database server.
Hint: Some lines were ellipsized, use -l to show in full.
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