TechBytes » CentOS

How to change “-bash-*”?

Asim Zeeshan — Wed, 23 Jun 2010 15:07:47 +0000

If you are seeing this in your bash (SSH), It makes it tough to navigate through SSH since it doesn’t give you much information.

-bash-3.2#

To fix that, you can simply type this in your SSH when logged in:

PS1="[\u@\h \W]\$ "

Build-Essentials in CentOS?

Asim Zeeshan — Fri, 28 May 2010 17:43:21 +0000

If you are like me, you may be doing this to install essential build libraries to compile something from source

# wrong method
yum install build-essential

Build essential is a Ubuntu / Debian package. On CentOS, you need to do this

yum groupinstall "Development Tools"

Warning: This will install all development tools approx 49 packages closing to 65MB

Good bye CentOS! Hello Ubuntu

Asim Zeeshan — Fri, 14 May 2010 20:01:00 +0000

Its been about almost more then two years since I have been playing with CentOS on many different platforms etc. Its very stable but on the other hand, PHP/MySQL updates are very hard to get and still PHP is 5.1.6. I tried EPEL repo and it updated PHP to 5.3.1 but still there were conflicts with stuff and many core packages.

So, I thought why not move to Ubuntu since it has just announced 10.04LTS (Long Term Support) in April 2010. Folks at iWeb were really nice to do a reinstall without any charges and also process a memory upgrade request at an amazing 50% discount.

Ubuntu 10.04 LTS

Apache 2 version is 2.2.14
PHP version is 5.3.2
MySQL version is 5.1.41-3ubuntu12
SVN (Subversion) version is 1.6.6

As a comparison CentOS 5.4 has the following versions

Apache 2 version is 2.2.3
PHP version is 5.1.6
MySQL version is 5.0.77
SVN (Subversion) version is 1.4.2

So if you are a PHP developer looking to deploy a Linux flavour on your new box, choose Ubuntu

Bought a new VPS from QuickWeb

Asim Zeeshan — Fri, 07 May 2010 22:09:19 +0000

I just secured a nice deal on QuickWeb.co.nz‘s Texas data center. Thanks to lowendbox for the info on this special coupon. Plan to use it to test new stuff before putting it on my two other production servers (with iWeb.com).

How to change password in linux console?

Asim Zeeshan — Fri, 07 May 2010 21:26:27 +0000

Connect to server via SSH and then issue the following command

sudo passwd

output will be something similar to this

root@vps:~# sudo passwd
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully

Fixing Pear ‘unsupported protocal’ error

Asim Zeeshan — Tue, 12 Jan 2010 07:00:58 +0000

Are you getting the following error while updating any package in pear?

pear.php.net is using a unsupported protocal – This should never happen.

I got this error right after I upgraded PHP from 5.2 to 5.9 (using CentOS-Testing repo). To resolve this situation, do this.

rm -fr /usr/share/pear/.channels

and then do this

pear update-channels

It should now give you the following output

Updating channel "doc.php.net"
Update of Channel "doc.php.net" succeeded
Updating channel "pear.php.net"
Update of Channel "pear.php.net" succeeded
Updating channel "pecl.php.net"
Update of Channel "pecl.php.net" succeeded

That’s it, your issue is resolved.

To update or not to update?

Asim Zeeshan — Fri, 08 Jan 2010 19:44:50 +0000

All my technical life, I knew and followed this simple rule

New updates to any application or component are meant to improve and fix the bugs present in it. Downloading new updates ensures that you system is up-to-update, has fixes to all those bugs you have been getting annoyed with and more stable.

Unfortunately not every IT department thinks that, especially the one I am facing at work. According to them, the new updates should only be applied IF and only IF they offer some new functionality (duhh!). Hello! what happened to the bug-fixes that are promised with these updates?

Anyway, my Linux box tells me that I have the following updates available but some nut-head thinks its a waste of precious bandwidth

Here is my question, would you update your operating system on a regular basis or would you prefer not to? and WHY?

Are you getting “Unfinished transactions remaining … run yum-complete-transaction first” error?

Asim Zeeshan — Thu, 26 Nov 2009 15:14:58 +0000

Are you getting this?

There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them.

if so, just do this

yum install yum-utils

and then run

yum-complete-transaction

CentOS yum update missing dependency error

Asim Zeeshan — Fri, 07 Aug 2009 12:13:47 +0000

If you are using

yum update

on CentOS and getting the following errors

Missing Dependency: /usr/lib/python2.4 is needed by package libxml2-python-2.6.26-2.1.2.7.i386 (installed)
gamin-python-0.1.7-8.el5.i386 from installed has depsolving problems
Missing Dependency: /usr/lib/python2.4 is needed by package gamin-python-0.1.7-8.el5.i386 (installed)
Error: Missing Dependency: /usr/lib/python2.4 is needed by package libxml2-python-2.6.26-2.1.2.7.i386 (installed)
Error: Missing Dependency: /usr/lib/python2.4 is needed by package gamin-python-0.1.7-8.el5.i386 (installed)

Don’t panic, the solution is simple … just run the following command

yum clean all

Then do

yum update

Installing PHP 5.2.6 on CentOS box

Asim Zeeshan — Fri, 10 Jul 2009 10:15:03 +0000

If you want to install PHP 5.2.x instead of the PHP 1.5.6 offered with default CentOSPlus repo. Please consider installing the utterramblings repo. Setting up this repo is a breeze … just follow these steps

nano -w /etc/yum.repos.d/utterramblings.repo

(I prefer nano as I mentioned earlier in my posts but you can use vi or any other editor that you like)

Then paste the following code in the editor

[utterramblings]
name=Jason's Utter Ramblings Repo
baseurl=http://www.jasonlitka.com/media/EL$releasever/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://www.jasonlitka.com/media/RPM-GPG-KEY-jlitka

Hit Ctrl+X and it will prompt you to save this file, you need to confirm this with punching Y

Now comes the last step, type the following and everything will be updated

yum update

Enjoy the latest packages

Note: PHP 5.3.0 is still not available in stable repos because the Zend Optimizer is still in Beta for that particular version.

TechBytes » CentOS

How to change “-bash-*”?

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