安裝環境:CentOS7 64位,MySQL5.7
1、配置YUM源
在MySQL官網中下載YUM源rpm安裝包:http://dev.mysql.com/downloads/repo/yum/ 

| # 下載mysql源安裝包shell> wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm# 安裝mysql源shell> yum localinstall mysql57-community-release-el7-8.noarch.rpm | 
檢查mysql源是否安裝成功
shell> yum repolist enabled | grep "mysql.*-community.*"
 
看到上圖所示表示安裝成功。 
可以修改vim /etc/yum.repos.d/mysql-community.repo源,改變默認安裝的mysql版本。比如要安裝5.6版本,將5.7源的enabled=1改成enabled=0。然后再將5.6源的enabled=0改成enabled=1即可。改完之后的效果如下所示: 

2、安裝MySQL
| shell> yum install mysql-community-server | 
3、啟動MySQL服務
| shell> systemctl start mysqld | 
查看MySQL的啟動狀態
| shell> systemctl status mysqld● mysqld.service - MySQL Server Loaded: loaded (/usr/lib/systemd/system/mysqld.service; disabled; vendor preset: disabled) Active: active (running) since 五 2016-06-24 04:37:37 CST; 35min ago Main PID: 2888 (mysqld) CGroup: /system.slice/mysqld.service └─2888 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid6月 24 04:37:36 localhost.localdomain systemd[1]: Starting MySQL Server...6月 24 04:37:37 localhost.localdomain systemd[1]: Started MySQL Server. | 
4、開機啟動
| shell> systemctl enable mysqldshell> systemctl daemon-reload | 
5、修改root本地登錄密碼
mysql安裝完成之后,在/var/log/mysqld.log文件中給root生成了一個默認密碼。通過下面的方式找到root默認密碼,然后登錄mysql進行修改:
| shell> grep 'temporary password' /var/log/mysqld.log | 

| shell> mysql -uroot -pmysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!'; | 
或者
| mysql> set password for 'root'@'localhost'=password('MyNewPass4!'); | 
注意:mysql5.7默認安裝了密碼安全檢查插件(validate_password),默認密碼檢查策略要求密碼必須包含:大小寫字母、數字和特殊符號,并且長度不能少于8位。否則會提示ERROR 1819 (HY000): Your password does not satisfy the current policy requirements錯誤,如下圖所示:
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