一、下载linux mysql8.0 离线安装包

mysql下载地址：https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.20-linux-glibc2.12-x86_64.tar.xz
mysql官方下载最新版本：https://dev.mysql.com/downloads/mysql/ 然后选择 linux

把下载的压缩包上传到要安装的服务器上，解压mysql tar xvJf mysql-8.0.21-linux-glibc2.12-x86_64.tar.xz



二、安装mysql

在 /usr/local 目录下创建mysql文件夹 mkdir mysql

切换到mysql目录下 cd /usr/local/mysql

# 解压mysql
[root@localhost /usr/local/mysql]#  tar mysql-8.0.20-linux-glibc2.12-x86_64.tar.xz
# 移动/重命名文件夹 
[root@localhost /usr/local/mysql]# mv mysql-8.0.20-linux-glibc2.12-x86_64.tar.xz mysql-8
# 创建 data 文件夹 储存文件
[root@localhost /usr/local/mysql]# cd mysql-8
[root@localhost /usr/local/mysql/mysql-8# mkdir data
# 创建用户组以及用户和密码
[root@localhost /usr/local/mysql/mysql-8]# groupadd mysql
[root@localhost /usr/local/mysql/mysql-8]# useradd -g mysql mysql
# 授权用户
[root@localhost /usr/local/mysql/mysql-8]# chown -R mysql.mysql /usr/local/mysql/mysql-8
# 切换到bin目录下，初始化基础信息
[root@localhost /usr/local/mysql/mysql-8]# cd bin
[root@localhost /usr/local/mysql/mysql-8/bin]# ./mysqld --user=mysql --basedir=/usr/local/mysql/mysql-8 --datadir=/usr/local/mysql/mysql-8/data/ --initialize --lower-case-table-names=1

得到临时密码

编辑 my.cnf (没有就新建一个 touch my.cnf) vim /etc/my.cnf 注释mysqld_safe

[mysqld]
basedir=/usr/local/mysql/mysql-8/
datadir=/usr/local/mysql/mysql-8/data/
socket=/tmp/mysql.sock
character-set-server=UTF8MB4
lower_case_table_names  = 1
bind-address=0.0.0.0
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION

#进入/usr/local/mysql/mysql-8目录
[root@localhost bin]# cd /usr/local/mysql/mysql-8
# 添加mysqld服务到系统
[root@localhost /usr/local/mysql/mysql-8]# cp -a ./support-files/mysql.server /etc/init.d/mysql
# 授权以及添加服务
[root@localhost /usr/local/mysql/mysql-8]# chmod +x /etc/init.d/mysql
[root@localhost /usr/local/mysql/mysql-8]# chkconfig --add mysql
# 启动 mysql
[root@localhost /usr/local/mysql/mysql-8]# service mysql start
# 停止 mysql
[root@localhost /usr/local/mysql/mysql-8]# service mysql stop
# 重启 mysql
[root@localhost /usr/local/mysql/mysql-8]# service mysql restart
# 查看启动状态
[root@localhost /usr/local/mysql/mysql-8]# service mysql status
# 将mysql命令添加到服务
[root@localhost /usr/local/mysql/mysql-8]# ln -s /usr/local/mysql/mysql-8/bin/mysql /usr/bin
# 登录mysql(使用临时密码) 
[root@localhost /usr/local/mysql/mysql-8]# mysql -uroot -p

# 修改root密码并刷新使密码
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'xxxxxx';
flush privileges;
# 选择mysql数据库
use mysql;
# 修改远程连接并生效
update user set host='%' where user='root';
flush privileges;