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 mariadbmariadb-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：

[root@localhost ~]# groupadd mysql[root@localhost ~]# useradd -r -g mysql -s /bin/false mysql

（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/data2019-11-03T09:47:18.263716Z 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=457902019-11-03T09:47:19.140866Z 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_setup2019-11-03 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

（7）编辑配置文件，保存退出：

[root@localhost mysql]# vim /etc/my.cnf[mysqld]# GENERALdatadir=/app/datasocket=/app/data/mysql.sockuser=mysqldefault-storage-engine=InnoDB[mysqld_safe]log-error=/app/data/mysql-error.logpid-file=/app/data/mysqld.pid[client]socket=/app/data/mysql.sock

（8）启动MySQL：

[root@localhost mysql]# bin/mysqld_safe --user=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 -pEnter password:Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 2Server version: 5.7.28Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql>

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