mysql访问被拒绝，ssh数据库主机

Question

i am trying to access mysql into an remote server, and create a database there. i am using putty to connect. the problem is that i get the "access denied" error whatever i do:

:mysql -p
:mysql -u <username> -p
.
.
.

i still get the warning.

ERROR 1045 (28000): Access denied for user 'username'@'localhost' (using password: NO)

ERROR 1045 (28000): Access denied for user 'username'@'localhost' (using password: YES)

one for each occasion, when i do not enter a password, and when i do.

Answer 1

You are having issues with remote access to MySql. From here

• Step # 1: Login over ssh

First, login over ssh to remote MySQL database server

• Step # 2: Enable networking

Once connected you need edit the mysql configuration file my.cfg using text editor such as vi.

In Debian Linux file is located at /etc/mysql/my.cnf

# vi /etc/my.cnf

• Step # 3: Once file open, locate line that read as [mysqld]

Make sure line skip-networking is commented (or remove line) and add following line

bind-address=YOUR-SERVER-IP

For example, if your MySQL server IP is 172.20.5.2 then entire block should be look like as follows:

[mysqld]
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
language = /usr/share/mysql/English
bind-address = 172.20.5.2

# skip-networking
....
..
....

Where - bind-address : IP address to bind to. - skip-networking : Don't listen for TCP/IP connections at all. All interaction with mysqld must be made via Unix sockets. This option is highly recommended for systems where only local requests are allowed. Since you need to allow remote connection this line should removed from file or put it in comment state.

• Step# 4 Save and Close the file.

Restart your mysql service to take change in effect

# /etc/init.d/mysql restart

• Step # 5 Grant access to remote IP address

  # mysql -u root –p mysql

Grant access to new database

If you want to add new database called foo for user bar and remote IP 162.54.10.20 then you need to type following commands at mysql> prompt:

mysql> CREATE DATABASE foo;

mysql> GRANT ALL ON foo.* TO bar@'162.54.10.20' IDENTIFIED BY 'PASSWORD';

Grant access to existing database

Let us assume that you are always making connection from remote IP called 162.54.10.20 for database called webdb for user webadmin then you need to grant access to this IP address. At mysql> prompt type following command for existing database:

mysql> update db set Host='162.54.10.20' where Db='webdb';

mysql> update user set Host='162.54.10.20' where user='webadmin';

• Step # 6: Logout of MySQL

Type exit command to logout mysql

mysql> exit

• Step # 7: Test it

From remote system type command

$ mysql -u webadmin –h 172.20.5.2 –p

You can also use telnet to connect to port 3306 for testing purpose

$ telnet 172.20.5.2 3306