LAMP How To - Open Source At Work

Installing phpunit

bpeh — Sat, 27 Feb 2010 06:57:41 +0000

this is very simple, firstly install pear http://www.azhowto.com/2009/08/14/php-manual-install-of-pear/ then from the pear manual, ie http://www.phpunit.de/manual/3.4/en/installation.html pear channel-discover pear.phpunit.de pear channel-discover pear.symfony-project.com pear install --alldeps phpunit/PHPUnit getting the latest phpunit will need php 5.2 and above. To get php 5.2, see http://www.azhowto.com/2009/08/07/getting-new-packages-from-centos-dev-repo/

Highly available load Balancer + web server in centos

bpeh — Wed, 10 Feb 2010 10:38:57 +0000

This tutorial is about creating a highly available HTTP load balancer using HAProxy. The setup can be slightly complicated but you will appreciate the result - you will get a load-balanced + highly available web service in your network. Basic linux skill is assumed. Scenario: Imagine we have 2 physical machines. In each machine, I have 2 [...]

submitting a form using hyperlinks

bpeh — Wed, 10 Feb 2010 03:08:36 +0000

If using hyperlink to submit form, remember to return false in “onclick” so that it is backward compatible with IE6, ie <a class=”button_next” href=”javascript:;” onclick=”$(’#form_wizard’).submit();return false;”> <span>Update</span> </a>

resolving jquery conflict with other javascript libraries

bpeh — Thu, 04 Feb 2010 00:23:31 +0000

It is good to know that jquery can work with other js libraries… Just need to know how to resolve the conflict http://api.jquery.com/jQuery.noConflict

syncing date and time in command line

bpeh — Fri, 22 Jan 2010 23:25:23 +0000

having the wrong date and time in the system can be disastrous as many applications will be using the system date and time. It is therefore very important to have the right date and time. In linux, yum install ntp chkconfig ntp on ntpdate pool.ntp.org service ntpd start You can add the ntpdate command to cron to automate the syncing process. [...]

Starting and stopping vmware in linux command line

bpeh — Wed, 20 Jan 2010 23:55:57 +0000

One advantage of using command line is that you can start and stop the VM without logging into the web console. I am using vmware server 2.0. I believe it should work the same for future versions. To start and stop certain instance, say ares, vmrun -T server -h 'https://10.2.115.21:8333/sdk' -u root -p 'yourpass' start "[standard] [...]

using variables in cron

bpeh — Wed, 20 Jan 2010 23:49:06 +0000

unlike normal bash scripts, you can’t really use the back ticks to execute a certain command like so DATE=`date +%F` In crontab, you have to use the $(), eg $(date +\%F)

fsck on lvm partition

bpeh — Wed, 20 Jan 2010 20:52:25 +0000

fsck on lvm can be a bit tricky. Like a the normal process, the partition needs to be umounted and we can boot up using the rescue cd or in emergency mode. Normally, you fsck /dev/sda1 if the partition is lvm, you need to activate the lvm first like so vgchange --ignorelockingfailure -ay lvscan --ignorelockingfailure (this command should now [...]

SVN commits fail- Can’t get exclusive lock

bpeh — Fri, 15 Jan 2010 03:36:13 +0000

this could be due to many reasons. If your data is in a nfs mounted drive, restart nfs and it should fix the problem.

php coding standard and tips

bpeh — Sun, 10 Jan 2010 10:53:32 +0000

It is important that developers follow a certain coding standard to help make the code readable and maintainable. These are what I gathered so far as the best coding practice: File formatting: - Never close php tag when using zend framework, ie, “?>” - Use 4 space indentation as tab spacing. It is possible to configure this in [...]

Installing SVN on a samba shared drive in mac

bpeh — Thu, 07 Jan 2010 21:30:41 +0000

1. Configure the samba share in linux. It needs to have the “delete readonly = yes” line, if not, you will permission errors in .svn/entries when checking out projects in mac. so we need something like this: [homes] comment = LAM IT Home Directories [...]

mounting windows share on local machine via samba - fixing selinux

bpeh — Thu, 07 Jan 2010 02:16:23 +0000

if you are running selinux, you get this error SELinux is preventing samba (smbd) "getattr" to /mnt/blarblar (cifs_t). For complete SELinux messages. run sealert -l e523015e-150a-4736-80c1-c7a40af6d396" In fstab, we need to mount samba with the right context like so: //10.2.115.11/linuxbackup /mnt/blarblar cifs domain=MYDOMAIN,user=backupservice,password=blarblar,context=system_u:object_r:samba_share_t:s0 0 0 or using command line, remember to use the right context mount --context="system_u:object_r:samba_share_t:s0" I found the “samba_selinux” [...]

Installing KVM in Centos, Redhat or Fedora

bpeh — Wed, 23 Dec 2009 12:37:27 +0000

KVM is available in RHEL 5.4. I finally managed to find the time to play around it over the weekend. I don’t think it is as matured as xen but having said that, I do agree with the approach - Kernel virtualisation. Redhat is promoting kvm very hard and you can see it from their [...]

making dd to report the copy status

bpeh — Wed, 23 Dec 2009 03:50:53 +0000

the linux “dd” command is indispensible to all sys admin. Many people already know that by killing the dd process with the usr1 signal, we can force it to display the file transfer status which is useful. You can either run a script or check the dd process id from “ps aux”, then kill -usr1 pid The [...]

Installing different language support for Linux

bpeh — Mon, 21 Dec 2009 05:04:51 +0000

It is easy using yum. If want to install chinese in centos for example, yum install "@Chinese Support" This will bring in all required chinese libraries…

Setting Up A Secure Linux Authentication Server Quickly (LDAP + TLS + SAMBA)

bpeh — Fri, 18 Sep 2009 05:40:22 +0000

Just like microsoft active directory, having a centralised authentication server in linux is important especially when you have more than one server or service to manage. Just imagine each service (ssh, samba, httpd…etc) has its own user database… Sooner or later, you will find managing users very difficult. A simple task like deleting a user [...]

bash: copying files without prompt

bpeh — Wed, 09 Sep 2009 03:51:18 +0000

It can be annoying that the ‘cp’ command keep prompting if you are to overwrite some files. This is due the cp alias. To fix that, unalias cp cp -af source target done.

Restarting vmware web access

bpeh — Thu, 03 Sep 2009 01:22:15 +0000

sometimes the vmware web access just halted for some reason. A good way to overcome that is to simply restart the vmware web server, ie /etc/init.d/vmware-mgmt restart

Bash: Simple command to mass replace content in directory

bpeh — Wed, 02 Sep 2009 06:00:19 +0000

Imagine that we need to mass change the content in certain directory. A combination of find and sed can save the day. It is very to do it in perl as well. find /your/dir -type f | xargs sed -i 's/old/new/g'

extending vmware harddisk

bpeh — Mon, 31 Aug 2009 01:26:59 +0000

1. shutdown vmware either from browser or console. 2. checkout the vmware-vdiskmanager command. The example there tells everything.