MySQL ERROR 2002 (HY000): Can't connect to local MySQL server through socket

Question

I noticed this issue when my Wordpress server started throwing aa MySQL error. To try to debug Wordpress, I attempted to connect manually.

I get the following:

$ mysql -u root -p -h localhost -P 3306                                                                                                                                         
Enter password:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/opt/bitnami/mysql/tmp/mysql.sock' (2)

I've also tried no -h option and 127.0.0.1

It looks like MySQL is running.

$ ps -ef | grep mysql                                                                                                                                                           
mysql    14743     1  0 15:20 ?        00:00:00 /usr/sbin/mysqld
bitnami  14939 13882  0 15:28 pts/0    00:00:00 grep --color=auto

mysql-server is installed, but /opt/bitnami/mysql/tmp/mysql.sock does not exist.

It looks like MySQL is listening on the correct port.

$ telnet 127.0.0.1 3306
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
[
5.5.54-0ubuntu0.14.04.1,IIq{;Rh�k>5/)"m"[&J#mysql_native_password

!#08S01Got packets out of orderConnection closed by foreign host.

Following the suggestion here:

$ sudo /opt/bitnami/ctlscript.sh status
php-fpm already running
apache already running
mysql not running
$ sudo /opt/bitnami/ctlscript.sh start mysql
2017-02-14T16:53:25.064586Z mysqld_safe Logging to '/opt/bitnami/mysql/data/mysqld.log'.
2017-02-14T16:53:25.233250Z mysqld_safe Starting mysqld.bin daemon with databases from /opt/bitnami/mysql/data
2017-02-14T16:53:28.400598Z mysqld_safe mysqld from pid file /opt/bitnami/mysql/data/mysqld.pid ended
/opt/bitnami/mysql/scripts/ctl.sh : mysql  could not be started
Monitored mysql

Here are a few choice lines from /opt/bitnami/mysql/data/mysqld.log. It looks like theres a conflict.

2017-02-14T17:03:31.274720Z 0 [Note] Server hostname (bind-address): '127.0.0.1'; port: 3306
2017-02-14T17:03:31.274778Z 0 [Note]   - '127.0.0.1' resolves to '127.0.0.1';
2017-02-14T17:03:31.274835Z 0 [Note] Server socket created on IP: '127.0.0.1'.
2017-02-14T17:03:31.274888Z 0 [ERROR] Can't start server: Bind on TCP/IP port: Address already in use
2017-02-14T17:03:31.274901Z 0 [ERROR] Do you already have another mysqld server running on port: 3306 ?
2017-02-14T17:03:31.274952Z 0 [ERROR] Aborting

Answer 1

Before doing anything first check space. Make sure it is not used 100%

df -h

If space is available.

For Chcecking Mysql is running or not.

ps xufa | grep mysql

Restart mysql

sudo service bitnami restart mysql

Answer 2

The issue is that you already have a mysql server running which is not the bitnami one. You should stop that service first before start the mysql server from bitnami.

You can try to stop with:

$ sudo service mysql stop

If it doesn't work you can kill the process:

$ sudo kill 14743

And finally start the bitnami mysql server with this command:

$ sudo /opt/bitnami/ctlscript.sh start mysql

After this server is running you should be able to connect without problems.