在centos7上部署mysql8.0

1.安装MySQL的话会和MariaDB的文件冲突，所以需要先卸载掉MariaDB。查看是否安装mariadb

rpm -qa | grep mariadb

2. 卸载mariadb

rpm -e --nodeps 查看到的文件名

3.下载MySQL安装包

MySQL官网下载地址:

MySQL :: Download MySQL Community Serverhttps://dev.mysql.com/downloads/mysql/

把安装包解压，然后上传到 /usr/local目录下，并且重命名为mysql：

4.创建存储数据的data目录

mkdir /usr/local/mysql/data

5.创建用户组

groupadd mysql

6.创建用户

-r：创建系统用户
-g：指定用户组

useradd -r -g mysql mysql

7.修改目录所属用户和用户组

chown -R mysql:mysql /usr/local/mysql

8.修改权限

chmod -R 755 /usr/local/mysql

9.进入MySQL的bin目录

cd /usr/local/mysql/bin

10.初始化

./mysqld --initialize --user=mysql --datadir=/usr/local/mysql/data --basedir=/usr/local/mysql

初始化完成最后面会打印一个随机密码，后面会用到。

11.修改配置文件

vim /etc/my.cnf

配置文件修改为以下内容：

[client]
port = 3306
socket = /usr/local/mysql/data/mysql.sock
default-character-set = utf8mb4

[mysql]
default-character-set = utf8mb4

[mysqld]
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_general_ci
init_connect = 'SET NAMES utf8mb4'
port = 3306
socket = /usr/local/mysql/data/mysql.sock
basedir= /usr/local/mysql
datadir = /usr/local/mysql/data

12.修改 /etc/my.cnf 的权限

chmod 755 /etc/my.cnf

13.启动MySQL

/usr/local/mysql/support-files/mysql.server start

14.创建软链接，并重启MySQL

ln -s /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql
ln -s /usr/local/mysql/bin/mysql /usr/bin/mysql
ln -s /usr/local/mysql/mysql.sock /var/mysql.sock
systemctl restart mysql