Linux系统版本：CentOS7.4
MySQL版本：5.7.28
在Linux平台有RPM包、二进制包、源码包3中安装方式，这一篇文章主要是以RPM包为例来介绍如何在Linux平台下进行MysqL的安装。
下载地址：
https://cdn.MysqL.com//Downloads/MysqL-5.7/MysqL-5.7.28-linux-glibc2.12-x86_64.tar.gz
具体安装步骤如下：
（1）首先卸载mariadb，不然后面会和安装MysqL需要的库冲突：
[root@localhost ~]# rpm -qa | grep mariadb mariadb-libs-5.5.56-2.el7.x86_64 [root@localhost ~]# rpm -e --nodeps mariadb-libs-5.5.56-2.el7.x86_64
（2）用root用户登录系统，增加MysqL用户和组，数据库安装在此用户下：
（3）准备数据目录
以/app/data为例,建议使用逻辑卷
[root@localhost ~]# mkdir -p /app/data [root@localhost ~]# chown MysqL.MysqL /app/data/ [root@localhost ~]# chmod 750 /app/data
（4）准备二进制文件：
[root@localhost ~]# tar xvf MysqL-5.7.28-linux-glibc2.12-x86_64.tar.gz -C /usr/local/ root@localhost ~]# cd /usr/local [root@localhost local]# ln -sv MysqL-5.7.28-linux-glibc2.12-x86_64 MysqL ‘MysqL' -> ‘MysqL-5.7.28-linux-glibc2.12-x86_64'
（5）初始化MysqL：
[root@localhost ~]# cd /usr/local/MysqL [root@localhost MysqL]# bin/MysqLd --initialize --user=MysqL --basedir=/usr/local/MysqL --datadir=/app/data 2019-11-03T09:47:18.263716Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details). 2019-11-03T09:47:19.059462Z 0 [Warning] InnoDB: New log files created, LSN=45790 2019-11-03T09:47:19.140866Z 0 [Warning] InnoDB: Creating foreign key constraint system tables. 2019-11-03T09:47:19.207569Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: ed1cd8ec-fe1e-11e9-8c9c-000c29f8617a. 2019-11-03T09:47:19.209181Z 0 [Warning] Gtid table is not ready to be used. Table 'MysqL.gtid_executed' cannot be opened. 2019-11-03T09:47:19.646366Z 0 [Warning] CA certificate ca.pem is self signed. 2019-11-03T09:47:20.056792Z 1 [Note] A temporary password is generated for root@localhost: rY-6f??#!<zO
其中--basedir MysqL基础目录 --datadir MysqL数据存放目录，并创建了root用户的临时密码：rY-6f??#!<zO
（6）开启ssl连接：
[root@localhost MysqL]# bin/MysqL_ssl_rsa_setup 2019-11-03 23:09:55 [ERROR] Failed to access directory pointed by --datadir. Please make sure that directory exists and is accessible by MysqL_ssl_rsa_setup. Supplied value : /usr/local/MysqL/data [root@localhost MysqL]# bin/MysqL_ssl_rsa_setup --datadir=/app/data
命令后面不加参数报错，加了--datadir后不报错
[root@localhost MysqL]# vim /etc/my.cnf [MysqLd] # GENERAL datadir=/app/data socket=/app/data/MysqL.sock user=MysqL default-storage-engine=InnoDB [MysqLd_safe] log-error=/app/data/MysqL-error.log pid-file=/app/data/MysqLd.pid [client] socket=/app/data/MysqL.sock
（8）启动MysqL：
（9）配置环境变量：
[root@localhost ~]# vim /etc/profile #添加下面一行 export PATH=$PATH:/usr/local/MysqL/bin [root@localhost ~]# source /etc/profile
（10）设置开机启动：
[root@localhost MysqL]# cp support-files/MysqL.server /etc/init.d/MysqL.server [root@localhost MysqL]# chkconfig --add MysqL.server
（11）测试登录成功：
[root@localhost ~]# MysqL -uroot -p Enter password: Welcome to the MysqL monitor. Commands end with ; or \g. Your MysqL connection id is 2 Server version: 5.7.28 copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved. Oracle is a registered Trademark of Oracle Corporation and/or its affiliates. Other names may be Trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. MysqL>
