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Posts Tagged ‘LINUX’

Dec 31

How to install PostgreSQL on CentOS Linux?

Last updated: December 31st, 2013

First lets do an update before we start installing PostgreSQL

$ yum update

You can install PostgreSQL from CentOS Base repo or can do a search for the latest version and install it based on your needs. Method 1 describes manual setup and Method 2 indicates an install from CentOS base repo (more…)

Nov 24

How to find the port used by mysql?

Last updated: November 24th, 2012

List the listening ports and check if mysql is listed on it.

$ netstat -tln | grep mysql

If you cannot find the port number for mysql view my.cnf file to see if you can find the port number. If you see a line “skip-networking” try commenting out the line and then restart mysql daemon.

$ vi /etc/my.cnf

# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).



$ service mysqld restart

Sep 25

How to check Python version number in Linux/Unix environment?

Last updated: September 25th, 2012

To check the Python version number in Linux, simply type

$ python -V

You will get an output

Python 2.4.3
Jun 25

Apache: [warn] NameVirtualHost *:80 has no VirtualHosts

Last updated: June 25th, 2011

$ /etc/init.d/apache2 restart

After configuring Apache server settings on the name server, you may encounter a message “[warn] NameVirtualHost has no VirtualHosts

The issue may be due to more than one entry of NameVirtualHost lines in the configuration settings. You can find this out by

$ grep NameVirtual * -R
site1:NameVirtualHost *:80
site2:NameVirtualHost *:80

Linux Solution: Remove one of the occurance of the NameVirtualHost and the warning message that you receive will vanish.

Jan 10

Linux: How to display ONLY the directories?

Last updated: January 10th, 2011

To display a list of directories in Linux, issue the command

$ ls -l | egrep ‘^d’

Jun 05

Beginner: Why there are many Linux Distributions?

Last updated: July 31st, 2010

There are different variants of Linux in the market like RedHat, Debian, CentOS, Ubuntu, Mandrake, Suse and a Linux beginner often ponder why they call Linux distributions by various names. The kernel or the heart of all the distributions is Linux and in bringing it to different market usage different community or vendors have adopted the kernel to serve that purpose.

Mar 18

Linux: Password creation

Last updated: March 18th, 2010

To create a password file and to add users to it, use the command
$ htpasswd -cm /secured/.mypass username1

To add users to the already existing password file, use the command
$ htpasswd -m /secured/.mypass username2

When additional users are added to the password file, ensure that you don’t use the “-c” option.

Read Password protect directories here

Mar 16

Linux: alias, unalias

Last updated: March 17th, 2010

Alias command comes handy when we are in need to make long and frequently used command string short.

To list the current set of aliases simply type
$ alias

To display the set alias for a specified alias name, type
$ alias alias-shortstring
$ alias ls

To set an alias you use the format
$ alias shortstring = “linux command string”

Mar 07

Apache: Where to put site configuration settings?

Last updated: March 17th, 2010

/etc/apache2/conf.d/ and /etc/apache2/sites-enabled are the two locations from where configuration settings are ready by apache

Apache configuration file has two lines (listed below) in /etc/apache2/apache2.conf which does that

# Include generic snippets of statements
Include /etc/apache2/conf.d/

# Include the virtual host configurations:
Include /etc/apache2/sites-enabled/

Mar 05

Ubuntu: Configuring Virtual Hosts to listen on different ports

Last updated: March 17th, 2010

Files to check
– /etc/apache2/ports.conf
– /etc/apache2/apache2.conf

Consider the ServerName to be “myserver”. Check /etc/hosts for an entry localhost myserver.com myserver


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