今天需要在本地测试系统功能,因为本地没有数据库,就需要在程序里面连接远程数据库;
先用ssh登录远程服务器,用root连上数据库看看情况;
mysql> select Host,User,Password from mysql.user; +----------------+------------------+-------------------------------------------+ | Host | User | Password | +----------------+------------------+-------------------------------------------+ | localhost | root | *836E233974EBE6EA32F95F890A91363F8427F78B | | iz94926clkiz | root | *836E233974EBE6EA32F95F890A91363F8427F78B | | 127.0.0.1 | root | *836E233974EBE6EA32F95F890A91363F8427F78B | | ::1 | root | *836E233974EBE6EA32F95F890A91363F8427F78B | | localhost | debian-sys-maint | *1460ED3535ABDBB887F9E5F57F40A2354610CDF3 | +----------------+------------------+-------------------------------------------+ 5 rows in set (0.00 sec)
一共有5个mysql账号,Host列可以看出来,这些账号都只支持服务器本机连接,现在我们来创建一个远程用户;
create user test identified by '123456';
+----------------+------------------+-------------------------------------------+ | Host | User | Password | +----------------+------------------+-------------------------------------------+ | localhost | root | *836E283974EBE6EA32F95F890A91363F8427F78B | | iz949s6clkiz | root | *836E283974EBE6EA32F95F890A91363F8427F78B | | 127.0.0.1 | root | *836E283974EBE6EA32F95F890A91363F8427F78B | | ::1 | root | *836E283974EBE6EA32F95F890A91363F8427F78B | | localhost | debian-sys-maint | *1460ED35E5ABDBB887F9E5F57F40A2354610CDF3 | | % | test | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | +----------------+------------------+-------------------------------------------+ 6 rows in set (0.00 sec)
创建完成了,在程序里面连接发现还是没有权限,刚才我们只是创建了用户,还没有对这个用户分配权限;
grant all privileges on *.* to 'test'@'%'identified by '123456' with grant option;
all代表接受所有操作,比如 select,insert,delete....; *.* 代表所有库下面的所有表;% 代表这个用户允许从任何地方登录;为了安全期间,这个%可以替换为你允许的ip地址;
然后刷新mysql用户权限相关表;
flush privileges ;
我以为就此收工了,等等,程序怎么还是连不上去,还是 access deny ;
难道端口不是3306吗,打开 mysql配置文件,是默认的3306,接着往下面看,发现一个关键地方;
bind-address = 127.0.0.1
原来这里mysql默认绑定了本地ip,不接受其他来源;注释掉,重启mysql 一切OK;
还有两个常用操作;
修改指定用户密码
update mysql.user set password=password('新密码') where User="test" and Host="localhost";
删除用户
delete from user where User='test' and Host='localhost';
最后在补充一个忘记root密码的解决办法
service mariadb stop sudo mysqld_safe --skip-grant-tables & mysql -u root -p use mysql; update user set password=PASSWORD("mynewpassword") where User='root'; flush privileges; quit service mariadb restart