centos7安装mysql

cd  /opt

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

rpm -ivh mysql-community-release-el7-5.noarch.rpm

 yum install mysql-community-server

成功安装之后重启mysql服务

service mysqld restart  （实际运行Redirecting to /bin/systemctl restart  mysqld.service）

初次安装mysql是root账户是没有密码的

设置密码的方法

mysql -uroot

mysql> set password for 'root'@'localhost' = password('root');

mysql> exit

mysql -uroot -p

创建msql账号用来远程登录：

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root' WITH GRANT OPTION;

flush privileges;

 查看用户是否有远程登录权限（内置mysql的user表）

SELECT DISTINCT CONCAT('User: ''',user,'''@''',host,''';') AS query FROM mysql.user;

设置监控日志：

vim etc/my.cnf

 找到[mysqlId]，添加如下代码：

log =/tmp/mysqls.log 
log-slow-requeries = /tmp/mysqlslowquedery.log(如果需要监控慢查询)
long_query_time = 1

msql5.7以上版本改为：

general_log=ON
general_log_file=/var/log/mysql/mysql.log
slow_query_log = on
slow-query-log-file = /var/log/mysql/mysql-slow.log
long_query_time = 2

service mysqld restart

监控SQL语句
tail -f  /var/log/mysql/mysql.log

将mysql升级为5.7

cd /opt
rpm -qa|grep mysql
rpm -e --nodeps mysql-community-common-5.6.37-2.el7.x86_64 ...
wget http://dev.mysql.com/get/mysql57-community-release-el7-7.noarch.rpm
rpm -ivh mysql57-community-release-el7-7.noarch.rpm
yum install mysql-server
mysql -V
systemctl start mysqld
修改密码
mysql_secure_installation
允许外部访问
update user set host='%' where user='root';
flush privileges;

exit;