1.1安装mysql

1.1.1 检查依赖

rpm -qa | grep libaio
rpm -qa | grep net-tools
rpm -qa | grep perl
yum install -y net-tools perl (如果没安装，则需要安装)

1.1.2 卸载mariadb

rpm -qa | grep mariadb
rpm -e --nodeps mariadb-libs-5.5.68-1.el7.x86_64

1.1.3.开始安装

mkdir mysql
tar xvf mysql-8.0.39-1.el7.x86_64.rpm-bundle.tar -C mysql
cd mysql
rpm -ivh mysql-community-common-8.0.39-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-plugins-8.0.39-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-8.0.39-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-8.0.39-1.el7.x86_64.rpm
rpm -ivh mysql-community-icu-data-files-8.0.39-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-8.0.39-1.el7.x86_64.rpm
mysqld --initialize --console --user=mysql  #初始化

1.1.4 检查是否安装成功

rpm -qa | grep mysql
mysql --version
systemctl status mysqld

1.1.5启动并开机自启

systemctl start mysqld
systemctl enable mysqld

1.1.6 查看初始化密码

cat /var/log/mysqld.log | grep password

1.1.7 修改密码并登陆

mysqladmin -uroot -p'初始化密码' password '新密码'
mysql -uroot -p'新密码'