CentOS通过yum安装Mariadb(MySQL)无法启动服务或者找不到mysql.sock(2)，mariadbmysql.sock

CentOS通过yum安装Mariadb(MySQL)无法启动服务或者找不到mysql.sock(2)，mariadbmysql.sock

今天在Linux主机（CentOS 7）安装（yum install方式）Mariadb（即开源MySQL）后，无法启动mariadb，其实是安装不完整，当然启动不了，更不用说输入
#mysql -u root
提示
Can’t connect to local MySQL server through socket ‘/tmp/mysql.sock’ (2)

安装mariadb，先搜索一发：
#yum search mariadb
出现：

#yum search mariadb
Loaded plugins: langpacks
============================= N/S matched: mariadb =============================
mariadb-bench.x86_64 : MariaDB benchmark scripts and data
mariadb-devel.i686 : Files for development of MariaDB/MySQL applications
mariadb-devel.x86_64 : Files for development of MariaDB/MySQL applications
mariadb-embedded.i686 : MariaDB as an embeddable library
mariadb-embedded.x86_64 : MariaDB as an embeddable library
mariadb-embedded-devel.i686 : Development files for MariaDB as an embeddable : library
mariadb-embedded-devel.x86_64 : Development files for MariaDB as an embeddable  : library
mariadb-libs.i686 : The shared libraries required for MariaDB/MySQL clients
mariadb-libs.x86_64 : The shared libraries required for MariaDB/MySQL clients
mariadb-server.x86_64 : The MariaDB server and related files
mariadb.x86_64 : A community developed branch of MySQL
mariadb-test.x86_64 : The test suite distributed with MariaD

嗯，把 mariadb mariadb-bench mariadb-server mariadb-embdedeb mariadb-libs都安装：
#yum install mariadb-embedded mariadb-libs mariadb-bench mariadb mariadb-server -y

先启动（service命令就不要用了）
# systemctl start mariadb

开机启动
$ systemctl enable mariadb

最后开启安装步骤
$ mysql_secure_installation