centos7.3安装mysql5.5

1. 安装MySQL 5.5的Yum Repository

sudo rpm -Uvh http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm

2. 安装MySQL 5.5

sudo yum install mysql-server

3. 启动MySQL服务

sudo systemctl start mysqld

4. 设置MySQL服务开机自启动

sudo systemctl enable mysqld

5. 查看MySQL服务状态

sudo systemctl status mysqld

6. 修改MySQL root密码

sudo mysql_secure_installation

7. 登录MySQL

mysql -u root -p

8. 创建新用户并授权

CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON *.* TO 'newuser'@'localhost' IDENTIFIED BY 'password';
FLUSH PRIVILEGES;

9. 退出MySQL

exit

注：上述命令中的“newuser”和“password”需要替换为你自己的用户名和密码。