Centos7安装Mysql5.7.42

安装前的清理

1. 查看是否安装了Mysql版本
   [root@localhost ~]# yum list installed mysql*
   [root@localhost ~]# rpm –qa|grep mysql*
   如果安装了请自行卸载
2. 查看是否安装了MariaDB
   [root@localhost ~]# rpm -qa|grep mariadb
3. 如果安装了MariaDB，则进行删除操作
   [root@localhost ~]# rpm -e --nodeps mariadb-libs
4. 下载Mysql5.7.42
   [root@localhost ~]# cd ~
   [root@localhost ~]# wget https://cdn.mysql.com//Downloads/MySQL-5.7/mysql-5.7.42-1.el7.x86_64.rpm-bundle.tar
5. 解压缩文件
   [root@localhost ~]# tar -xf mysql-5.7.42-1.el7.x86_64.rpm-bundle.tar

安装Mysql

1. 安装Mysql
   依次执行下列命令安装
   [root@localhost ~]# rpm -ivh mysql-community-common-5.7.42-1.el7.x86_64.rpm
   [root@localhost ~]# rpm -ivh mysql-community-libs-5.7.42-1.el7.x86_64.rpm
   [root@localhost ~]# rpm -ivh mysql-community-client-5.7.42-1.el7.x86_64.rpm
   [root@localhost ~]# rpm -ivh mysql-community-server-5.7.42-1.el7.x86_64.rpm
2. 清理安装过程文件
   [root@localhost ~]# rm mysql-*.rpm -f
   [root@localhost ~]# rm mysql-5.7.42-1.el7.x86_64.rpm-bundle.tar -f
3. 启动Mysql服务
   [root@localhost ~]# systemctl start mysqld
4. 查看临时密码
   [root@localhost ~]# cat /var/log/mysqld.log | grep 'A temporary password is generated for root@localhost:'
   查看最后一行的的临时密码，并记录。密码一般如：*WrvOW62>d+<**
5. 修改Mysql中root账户密码
   [root@localhost ~]# mysql -uroot -p
   并输入临时密码登录Mysql。
   mysql> set password for root@localhost = password('新密码');
   mysql> flush privileges;
   注意：推荐root用户仅限本地登录，创建一个账户用于默认的远程登录，如：dbadmin。

配置Mysql

创建一个管理权限用户，用于远程登录和管理数据库

1. 创建远程登录的管理用户dbadmin
   mysql> create user 'dbadmin'@'%' identified by '新密码';
2. 授予dbadmin账户权限
   mysql> grant all privileges on *.* to 'dbadmin'@'%' identified by '新密码';
   mysql> flush privileges;
   配置防火墙权限