Friday, March 25, 2016

Installing PHP 5.6 on Ubuntu Server 14.04.4 LTS

Hello Beginners,

Hopefully most of the Sys Admin kids won't consider about LTS (Long Term Support) or EOL (End Of Life) on product.

Every product have it's version and its end of life, you can see about EOL of php by following link.

http://php.net/supported-versions.php
http://php.net/eol.php

As same Ubuntu have

https://wiki.ubuntu.com/LTS

Okay now, why we discuss about it,
Ubuntu 14.04.4 LTS is latest product of Ubuntu which have Long Term Support, PHP 5.5 is php version support by Ubuntu 14.04.4 LTS, that means php in it's EOL. So it's good to install Ubuntu 14.04.4 with PHP 5.6

Normal repo of Ubuntu don't have PHP 5.6, so we can do following steps to install PHP.

$sudo add-apt-repository ppa:ondrej/php5-5.6
$sudo apt-get update
$sudo apt-get install php5
$php5 -v

That's it.

Enabling Modules in PHP5 & Apache2 @ Ubuntu 14.04.4 LTS

Usually beginners of LAMP administrator having trouble to installing and enabling modules of PHP and Apache2

In older days we can do this by config page or by linking modules location to PHP or Apache module enable location, but we can do same with following comments easily, Please note this is advisable if you using Ubuntu repository to install packages.

Enabling module for Apache2

$sudo a2enmod module_name

Ex.

$sudo a2enmod rewrite

Enabling module for PHP5

$sudo php5enmod module_name

Ex.
$sudo php5enmod mcrypt


Saturday, September 26, 2015

Postfix mail log with Subject line - Parallel Plesk Panel

We need mail subject in our Logs when we manage several domains with lots of mail IDs for better mail troubleshooting,

For postfix, normally don't have setting for mail log with subject line. But we have do it with simple trick on postfix configuration. Just follow bellow steps, It wont affect any off your mail services, but your log storage will increase some amount.

1. Open your postfix config file with your favoret text editor, mine always vim
vim /etc/postfix/main.cf

2. Find bellow line and un comment it, if commented.
header_checks = regexp:/etc/postfix/header_checks

3. Open file /etc/postfix/header_checks with your editor
vim /etc/postfix/header_checks

4. Add bellow line and save,
/^Subject:/     INFO

5. Restart postfix
service postfix restart

Send mail from your webmail and verify log by following comment. 
tail -f /var/log/maillog | grep Subject

For Plesk,

tail -f /usr/local/psa/var/log/maillog | grep Subject

Note " | grep Subject" used to filter only subject line, you can remove it as per your needs

Monday, September 7, 2015

Import Plesk mails to WHM cPanel mails - vice versa

Before start to the solution, I'll explain my situation,

I've 2 servers with Parallels Plesk - 11.5.30 and WHM - 11.50. Plesk have Postfix mail server and WHM have exim mail server.

My task is to migrate a domain example.com from Plesk installed server to WHM installed server.

Now I've moved files to new server, But how can I move mails from Plesk to WHM. It's really hard thing to do, because both have different mail server.

After lot of reference, I can see that horde will help on this.

Okay, Let's see what is Horde, It is a webmail client, slimier to squirrelmail, roundcube mail etc. It is used to check our mails on server with web interface.

So how it help us to import mails that located in server with Plesk control panel to server with WHM control panel.

Trick

1. How to Enable Horde web-mail on plesk.

Login in to your Plesk control panel, click "Tools & Settings" on left menu, click "Updates and Upgrades" under Panel, new window will open, click Add/Remove Components, on list under "Plesk webmails support" select "Horde web-mail support", if not selected and click remove another one. It'll take few min to install.

2. In WHM control panel, we don't have to do much work because by default there is option to choose our web-mail client.

3. Login in to Horde Web-mail client on plesk server, Right click Inbox, click Export. It'll ask to download file, use default option and click ok.

4. MBOX file will be downloaded.

5. Login to web-mail on WHM server, as same Right click and choose Import. It'll ask for mbox file, choose downloaded file.

6. It'll take few some time based on your mails count and size.

That's it.

Advantages:
It's very quick method to import, no need any configuration changes.

Disadvantages:
It's too hard if we have large amount of mail boxes.

Monday, August 10, 2015

How to overcome from CM Security lock

Hello guys,

It's really crazy thing that my friend faced.

He is having android smartphone with Kit-Kat version. For security, he have installed CM Security, while he play with it, he locked his screen. Forget pattern option also didn't work for him.

He called me and said about his problem, there are some solutions in this case. Most of them ask to do Hard reset. It's good option, if you don't have any important files in phone. Because this option will do factory reset.

Suddenly remembered about a great option on Android OS, Safe-Mode. It will disable all 3rd party applications and login to you phone.

So he just reboot his phone with safemode, removed that application. After that his mobile was work fine. Same trick will work for all 3rd party security applications.

Note these things,

1. This application should installed by you. That means 3rd party.
2. You are unable to overcome from encrypted files, you'll face serious damage on this.
3. This wont work if you locked with Android default security option.

How to do safemode booting on Android,

Just 3 seconds login press power button, you'll "PowerOff menu". Now long touch "PowerOff". It'll ask you to reboot with Safemode.

That's it, enjoy the trick.

Do not hack others phone with this, it's illegal, more than that, you'll loose their trust on you.

Wednesday, July 8, 2015

Using multiple skype accounts at a time in single system

It's official trick provided by Skype team to run multiple Skype accounts at a time.

Open Run Window by press Windows key + R,

copy paste following line based on your your OS arch

For 32bit OS
"C:\Program Files\Skype\Phone\Skype.exe" /secondary

For 64bit OS
"C:\Program Files (x86)\Skype\Phone\Skype.exe" /secondary

hit enter, Skype application will open

If you’ve changed the installation path for Skype, you need to enter full path for the Skype.exe file.

This will work only on Windows Operating System with desktop installation of Skype.

Thursday, June 18, 2015

Clearing RAM cache and SWAP memory in Linux

If your server get hanged, RAM cache is one of the major reason,. It happens frequently on web server when we are under attack or web developer dosen't consider about performance of application. Miss configuration of servers like mysql and apache is one of the main reason.

We can see ram cache amount on htop, which is user friendly monitoring tool for Linux servers. Because of it we may loss some connections and it's interaction with server. We can do this by our own risk.

What is RAM cache ?

It is a portion of memory made of high-speed static RAM (SRAM) instead of the slower and cheaper dynamic RAM (DRAM) used for main memory. Memory caching is effective because most programs access the same data or instructions over and over.

To clear cache :

free -m && sync && echo 3 > /proc/sys/vm/drop_caches && free -m

To clear pagecache change value of echo to 1 on about commend, to clear dentries and inodes change value of echo to 2 on about commend, echo 3 will clear all of three pagecache, dentries and inodes.

To clear swap:

Up-to I know that there is no straight way to this, But we can do it by disable and enable the swap, We can do this by following command,

To turn off : swapoff -a
To turn on : swapon -a 

Wednesday, May 6, 2015

Finding malware codes on web pages

It is beginners trick, not advised for administrators.

Lot's of tools are available on Linux to find the malware codes injected on server. But most of them not detect the page with url encoded. Because it's php functionality. Mostly of this happens when developer or administrator not aware problem when we providing 777 permissions to pages on web servers. In these cases simple java-script injection will make server to get down.

We can disable this function, urldecode but unfortunately it's bad idea on shared hosting and most of frameworks using url encode and decode. In this case, we can do some manual work for figure-out codes by following commend.

find . -iname '*php' | xargs grep 'urldecode' -sl

This will list the files that have urldecode. We can check page and remove code.