centos7下安装mysql（完整配置）
1. 下载并安装MySQL官方的Yum Repository
[root@localhost ~]# wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm
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使用上面的命令直接安装Yum Repository
[root@localhost ~]# yum -y install mysql57-community-release-el7-10.noarch.rpm
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安装MySQL服务器
root@localhost ~]# yum -y install mysql-community-server
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2. MySQL数据库设置
启动MySQL
[root@localhost ~]# systemctl start mysqld.service
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查看MySQL运行状态
[root@localhost ~]# systemctl status mysqld.service
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此时MySQL已经开始正常运行，需要找出root的密码
[root@localhost ~]# grep "password" /var/log/mysqld.log
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如下命令登录mysql
# mysql -uroot -p
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输入初始密码，此时不能做任何事情，因为MYSQL默认必须修改密码才能正常使用
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new password';
这里会遇到一个问题，新密码设置过于简单会报错
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可通过如下命令查看完整的初始密码规则
mysql>show variables like 'validate_password';
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可通过如下命令修改
mysql> set global validate_password_policy=0;
mysql> set global validate_password_length=1;
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还有一个问题就是Yum Repository,以后每次 yum 操作都会自动更新，需要把这个卸载掉
[root@localhost ~]# yum -y remove mysql57-community-release-el7-10.noarch
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远程登录数据库出现下面出错信息
ERROR 2003 (HY000): Can’t connect to MySQL server on ‘xxx.xxx.xxx.xxx’,
原因是没有授予相应的权限
#任何主机
mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
指定主机
mysql>GRANT ALL PRIVILEGES ON . TO 'jack'@’10.10.50.127’ IDENTIFIED BY '654321' WITH GRANT OPTION;
然后刷新权限
mysql>flush privileges;
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修改mysql数据库总的user表使相的用户能从某一主机登录
mysql>use mysql;
mysql>update user set host = '%' where user = 'root';
mysql>select host, user from user;
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客户端提供MYSQL的环境，但是不支持中文,通过以下命令可以查看mysql的字符集
mysql>show variables like 'character_set%';
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显示如下：
为了让 MySQL支持中文，需要把字符集改成UTF-8，方法如下
# vim /etc/my.cnf
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改成如下内容
[client]
port=3306
socket=/var/lib/mysql/mysql.sock
default-character-set=utf8
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
character-set-server=utf8
[mysql]
no-auto-rehash
default-character-set=utf8
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
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重启mysql服务
# service mysqld restart
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重新查看数据库编码
show variables like 'character_set%';
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效果如下,可看到都改为utf-8
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