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

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。

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# mysql -u root
Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

安装mariadb，先搜索一发：

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# 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。
然后启动/开机启动/启动初始安装程序。

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# yum install mariadb-embedded mariadb-libs mariadb-bench mariadb mariadb-server -y
# systemctl start mariadb
# systemctl enable mariadb
# mysql_secure_installation