MySQL安装

一、检查当前环境是否安装MySQL，如有安装MySQL或者Mariadb，可以卸载；

rpm -qa | grep mysql
pm -qa |grep mariadb
yum remove mariadb-libs-5.5.64-1.el7.x86_64

二、下载并安装
1、国内用户考虑切换yum源为阿里云；

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum makecache
yum update -y

2、下载对应版本的MySQL RPM安装包，下载地址http://mirrors.ustc.edu.cn/mysql-ftp/Downloads

# server包
wget https://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-5.7/mysql-community-server-5.7.31-1.el7.x86_64.rpm
# client包
wget http://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-5.7/mysql-community-client-5.7.31-1.el7.x86_64.rpm
# common包
wget http://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-5.7/mysql-community-common-5.7.31-1.el7.x86_64.rpm
# lib包
wget http://mirrors.ustc.edu.cn/mysql-ftp/Downloads/MySQL-5.7/mysql-community-libs-5.7.31-1.el7.x86_64.rpm

3、安装依赖包

yum install -y perl libaio net-tools

4、安装对应版本的MySQL（按顺序）

rpm -ivh mysql-community-common-5.7.31-1.el7.x86_64.rpm --force --nodeps
rpm -ivh mysql-community-libs-5.7.31-1.el7.x86_64.rpm --force --nodeps
rpm -ivh mysql-community-client-5.7.31-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-5.7.31-1.el7.x86_64.rpm

5、启动MySQL

systemctl start mysqld.service
systemctl status mysqld.service

6、登陆MySQL更新默认密码，

# 获取默认root密码
cat /var/log/mysqld.log | grep 'password'

# 登陆mysql，更改默认密码
mysql -u root -p
set password=password('xxxxxx')

# 开启远程连接
use mysql;
update user set Host = '%' where Host = 'localhost' and User='root';
flush privileges;