1. 檢測系統是否已安裝 mysql
   [[email protected] ~]# yum list installed | grep mysql
2. 刪除系統已安裝的 mysql 及其依賴
   [[email protected] ~]# yum -y remove mysql-libs.i686
3. 給CentOS新增rpm源
   wget http://repo.mysql.com//mysql-community-release-el6-5.noarch.rpm
   4.安裝yum源
   [[email protected] ~]# yum install mysql-community-release-el6-5.noarch.rpm
   [
   [email protected] ~]# yum repolist all | grep mysql
   [[email protected] ~]# yum repolist all | grep mysql
   [[email protected] ~]# yum-config-manager --disable mysql55-community
   [[email protected] ~]# yum-config-manager --disable mysql56-community
   [[email protected] ~]# yum-config-manager --enable mysql57-community-dmr
4. 安裝 MySQL 服務端
   [[email protected] ~]#yum install mysql-community-server
   Dependency Installed:
   mysql-community-client.x86_64 0:5.7.22-1.el6 
   mysql-community-common.x86_64 0:5.7.22-1.el6 
   mysql-community-libs.x86_64 0:5.7.22-1.el6

Complete!
看到以上結束語句，表示安裝成功

1. 啟動 mysql 服務
   [[email protected] ~]# service mysqld start
   檢視啟動是否成功：
   [
   [email protected] ~]# service mysqld status
   mysqld (pid 10698) 正在執行...
2. 修改 root 初始密碼
   我這裡用的是安全模式下進入設定密碼
   [[email protected] ~]#service mysqld stop
   [[email protected] ~]#mysqld_safe –skip-grant-tables &
   重新開一個終端輸入一下命令，然後直接敲enterj鍵：
   [[email protected] ~]#mysql -uroot -p
   進入之後，敲use mysql,用mysql資料庫;
   修改root使用者密碼
   mysql> update user set authentication_string=password(123456) where user='root'; 
   注：mysql5.7的密碼欄位是authentication_string，不是password
   重新整理許可權並退出
   mysql> >flush privileges;
   mysql> >quit
   重啟mysql，用密碼123456即可登入mysql
   [[email protected] ~]# service mysqld restart
   [[email protected] ~]# mysql -u root -p
   Oracle is a registered trademark of Oracle Corporation and/or its
   affiliates. Other names may be trademarks of their respective
   owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> 
出現以上內容，登入成功

1. 設定mysql開機啟動
   [[email protected] ~]# chkconfig mysqld on
   [[email protected] ~]# chkconfig mysqld status