CentOS 7下MySQL安装，启动

写本文主要是因为最近学习需要用到MySQL+Apache+PHP环境，安装MySQL的时候又遇到各种依赖的问题，写一篇文章记录CentOS7下MySQL的安装过程。

首先官网下载mysql包，http://www.mysql.com/downloads/mysql/#downloads 选择Red Hat Linux。下载然后rpm -ivh如下几个包

# rpm -ivh mysql-community-libs-8.0.12-1.el7.x86_64.rpm
# rpm -ivh mysql-community-common-8.0.12-1.el7.x86_64.rpm
# rpm -ivh mysql-community-client-8.0.12-1.el7.x86_64.rpm
# rpm -ivh mysql-community-server-8.0.12-1.el7.x86_64.rpm
# rpm -ivh mysql-community-devel-8.0.12-1.el7.x86_64.rpm

注意按顺序安装，因为之间都存在依赖关系。安装libs的时候，可能会包以下错：

# rpm -ivh mysql-community-libs-8.0.12-1.el7.x86_64.rpm
warning: mysql-community-libs-8.0.12-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
error: Failed dependencies:
    mariadb-libs is obsoleted by mysql-community-libs-8.0.12-1.el7.x86_64

这是由于centos 7默认使用的是mariadb数据库，会和mysql冲突，先卸载mariadb。

# rpm -qa | grep mariadb
mariadb-libs-5.5.56-2.el7.x86_64
mariadb-5.5.56-2.el7.x86_64
#rpm -e mariadb-libs-5.5.56-2.el7.x86_64
error: Failed dependencies:
    libmysqlclient.so.18()(64bit) is needed by (installed) postfix-2:2.10.1-6.el7.x86_64
    libmysqlclient.so.18(libmysqlclient_18)(64bit) is needed by (installed) postfix-2:2.10.1-6.el7.x86_64
    mariadb-libs(x86-64) = 1:5.5.56-2.el7 is needed by (installed) mariadb-1:5.5.56-2.el7.x86_64

还是有依赖性的东西，先卸载mariadb主包，Postfix是之前尝试做邮件服务器的东西，卸载postfix

# rpm -e mariadb-5.5.56-2.el7.x86_64
# rpm -ef|grep postfix
postfix-2.10.1-6.el7.x86_64
# rpm -e postfix-2.10.1-6.el7.x86_64

接着按顺序安装mysql包就好。安好之后

# systemctl start mysqld.service

查看mysql状态

# systemctl status mysqld.service
● mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2018-08-16 14:39:28 CST; 12s ago
 Docs: man:mysqld(8)
       http://dev.mysql.com/doc/refman/en/using-systemd.html
Process: 4373 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
Main PID: 4441 (mysqld)
Status: "SERVER_OPERATING"
CGroup: /system.slice/mysqld.service
       └─4441 /usr/sbin/mysqld

Aug 16 14:38:43 Lu systemd[1]: Starting MySQL Server...
Aug 16 14:39:28 Lu systemd[1]: Started MySQL Server.

这样就完成了mysql安装。

CentOS 7下MySQL安装，启动

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