安装MariaDB数据库后出现服务启动失败问题，
解决办法：卸载再安装！(确定无3306端口占用)
一、卸载数据库： [root@localhost logs]# yum -y remove mariadb*
二、删除数据库文件： [root@localhost logs]# rm -rf /var/lib/mysql/*
三、安装数据库： yum -y install mariadb mariadb-server
确定my.cnf配置文件无错
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# Settings user and group are ignored when systemd is used.
# If you need to run mysqld under a different user or group,
# customize your systemd unit file for mariadb according to the
# instructions in http://fedoraproject. org/wiki/Systemd
[mysqld_safe]
log-error=/var/log/mariadb/mariadb.log
pid-file=/var/run/mariadb/mariadb.pid
#
# include all files from the config directory
#
! includedir /etc/my.cnf.d