MySQL: Change Default Port Under Linux / UNIX

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Q.I’m using MySQL 5 under Red Hat Enterprise Linux 5. How do I change default mysql server port (tcp port 3306) under Linux or UNIX operating systems?

A. MySQL server and client uses a file called my.cnf. You need to open /etc/my.cnf (Global mysqld configuration file) to specify new port.

MySQL Change Default Port

Open /etc/my.cnf file:
# vi /etc/my.cnf
Set new port 5123:
port=5123
Here is is my sample /etc/my.cnf file:

[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
port=5123
old_passwords=1
bind = 10.10.29.66
key_buffer = 500M
table_cache = 4000
sort_buffer_size = 3M
read_buffer_size = 2M
read_rnd_buffer_size = 8M
myisam_sort_buffer_size = 64M
max_connections = 400
query_cache_type = 1
query_cache_limit = 1M
query_cache_size = 100M

max_allowed_packet = 1M
thread_cache_size = 8

# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 4
local-infile=0

[mysql.server]
user=mysql
basedir=/var/lib

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

[mysqldump]
quick
max_allowed_packet = 16M

Save and close the file. Restart mysqld:
# service mysqld restart
Please note that once port changed, you need to update all your php, perl, python scripts including iptables scripts.

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

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11 comment

  1. It would’ve been better if it had been a post on how to setup a different version of MySQL running on a different port.

    For example, I have MySQL 5.0.51b on mu Ubuntu box in the default location by sudo apt-get mysql.

    I now want to install MySQL 6 for testing purposes – yet at the same time for all users of my machine running on say, 3307.

    This way I could give the option to users to use both the stable and a dev version.

  2. Hi,

    I wish to set it to listen on port 80, or 443 but it wont start? Nothing is listening on those ports now. What could be wrong? I have heard it can have to do with services settings? Any ideas?

    Best regards – Jon

  6. Hi I have a problem for MySQL.

    I have MySQL (5.6, 64bit) installed in windows 7, also have mysql installed in virtualbox Ubuntu (v12). Without Windows MySQL installed, I can access Ubuntu MySQL locally or remotely by MySQL workbench. After Windows MySQl installed ( not started), I cannot connect to Ubuntu MySQL locally and remotely, even with different port numbers ( 3306 for windows and 5123 for Ubuntu).

    Any helps will be appreciated.

    Thanks!

  8. i was working on wamp server so the port for mysql 3306 is occupied by Wamp…i want nort to uninstall this…how can i resolve this.

  9. Now I am able to connect via 3306 and new port 1234 both.
    I want to disable port 3306 for mysql and keep running on 1234. How can I do that?

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