1) Login in to the server as a root user

open the file /etc/network/interfaces

Delete all the entries from the /etc/network/interfaces but make sure that you have taken of original file

cp -p /etc/network/interfaces /etc/network/interfaces-back

Now open the file, the ip address for server is 192.168.1.5 and gateway is 192.168.1.1 , change the ip as per your server ip and gateway

nano /etc/network/interfaces

auto eth0
iface eth0 inet static
address 192.168.1.5
netmask 255.255.254.0
gateway 192.168.1.1

if you are using the 192.168.11.* range on your ubuntu server than add the following entries

nano /etc/network/interfaces

auto eth0
iface eth0 inet static
address 192.168.11.5
netmask 255.255.254.0
gateway 192.168.11.1

If you are using any firewall like Cisco, Cyberoam than make sure that you are using the correct gateway as per your firewall ip address. For example our Cyberroam ip is 192.168.11.25 therefore my gateway is 192.168.11.25 and interface file having following entries

nano /etc/network/interfaces

auto eth0
iface eth0 inet static
address 192.168.11.5
netmask 255.255.254.0
gateway 192.168.11.25

Original article: Configure eth0 on Ubuntu Server

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To install xrdp and x11rdp on Ubuntu server, refer to the following steps but make sure that you are logged in as a root user.

sudo apt-get install xrdp

sudo apt-get build-dep xserver-xorg-core

sudo apt-get install gnome-session-fallback

apt-get install ubuntu-desktop

Create the new directory X11rdp

sudo mkdir /opt/X11rdp

cd /opt/X11rdp/

Download the laytest x11rdp tar file from the http://server1.xrdp.org/xrdp/ website

wget http://server1.xrdp.org/xrdp/x11rdp_xorg71.tar.gz

tar -xvf  x11rdp_xorg71.tar.gz

cd x11rdp_xorg71

sudo sh buildx.sh /opt/X11rdp –with-fontdir=/usr/share/fonts/X11

Once compilation completed run the following command

cd /opt/X11rdp/bin

Now we need to create the soft link for X11rdp binary in to /usr/bin directory

sudo ln -s /opt/X11rdp/bin/X11rdp /usr/bin/X11rdp

You can test if your binary runs without crashing now by typing; it will show you some error about fonts but you can ignore it or check for bugs

/usr/bin/X11rdp :1

You can try to use :2 or :3 if :1 is already in use bu vnc ..

Create the .xsession file in your home directory and insert the following text in it

sleep 1 gnome-session –session=ubuntu-2d
or
gnome-session –session=ubuntu-2d

If you receive the error about ubuntu-2d than refer to the following steps.

You can edit the file  /etc/xrdp/startwm.sh as per your desktop requirement in RDP.

Simply add the following BOLD line from startwm.sh script .

#!/bin/sh

if [ -r /etc/default/locale ]; then
. /etc/default/locale
export LANG LANGUAGE
fi

echo gnome-session –session=gnome-fallback > ~/.xsession
. /etc/X11/Xsession

You can also use the following parameter.

If you want to use GNOME Fallback (“GNOME Classic (no effects)”) insert the following in the startwm.sh file

• echo gnome-session –session=gnome-fallback > ~/.xsession

Or, to use Xfce (“Xubuntu Session”):

• echo xfce4-session > ~/.xsession

Or, to use LXDE (“Lubuntu Desktop”):

• echo lxsession -s Lubuntu -e LXDE > ~/.xsession

And it should work. Everytime you login to the remote-session the file .xsession will be created.

Original article: Install xrdp and x11rdp on Ubuntu server

©2013 Linux cPanel WebHosting Blog. All Rights Reserved.

First login in to the shell as a root user and download the  Firefox 3.6.3 tar file from the  Firefox mail web site.

Download Firefox 3.6.3

• Firefox will not run at all without the following libraries or packages installed on the server
  • GTK+ 2.10 or higher
  • GLib 2.12 or higher
  • Pango 1.14 or higher
  • X.Org 1.0 or higher

Run the command to install the packages

sudo apt-get install mercurial g++ make autoconf2.13 yasm libgtk2.0-dev libglib2.0-dev libdbus-1-dev libdbus-glib-1-dev libasound2-dev libcurl4-openssl-dev libiw-dev libxt-dev mesa-common-dev zip unzip

For more information check the FireFox WebSite

Once you downloaded the source files run the following commands

wget ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/3.6.3/linux-i686/en-US/firefox-3.6.3.tar.bz2

bzip2 -d firefox-3.6.3.tar.bz2

tar xvf firefox-3.6.3.tar

mv firefox/ /opt/firefox

Then backup your current Firefox executable binary backup by running the commands below, if the firefox is already installed

sudo mv /usr/bin/firefox /usr/bin/firefox-old

cd /opt/firefox

sudo ln -s /opt/firefox-3.6.3/firefox /usr/bin/firefox

Now launch the FirFox by running the command

firefox -p

or

./firefox

Troubleshooting :

1st) If receive any c++ related error while running the ./configure command run the

following command to update the c++

apt-get install gcc-c*

Original article: Install Firefox 3.6.3 on Ubuntu

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To decrease the LVM size run the following command as a root user.

[root@linux ~]# lvreduce -L1G /dev/testLVM/undertestLVM1

In above example we have decreased the LVM by 1G

To increase the LVM size run the following command as a root user.

[root@linux ~]# lvextend -L1.5G /dev/testLVM/undertestLVM1

In above example we have increased the LVM size by 1.5G

Now check the size of LVM

lvdisplay /dev/testLVM/undertestLVM1

Note : DO NOT TOUCH DECREASE MAIN LVM MAPPER ELSE SERVER FILE SYSTEM WILL CRASH.

Original article: How to extend and reduce the size for the LVM

©2013 Linux cPanel WebHosting Blog. All Rights Reserved.

SQL> startup
ORA-27154: post/wait create failed
ORA-27300: OS system dependent operation:semget failed with status: 28
ORA-27301: OS failure message: No space left on device
ORA-27302: failure occurred at: sskgpcreates

To resolve the above error simply login into the server as a root user and follow the following steps.

Open the /etc/sysctl.conf file and set the following value for the kernet.sem

kernel.sem = 250 32000 100 256

Now run the command

sysctl -p

After running above command, startup command is running fine.

SQL> startup
ORACLE instance started.

Total System Global Area 1586708480 bytes
Fixed Size 2213736 bytes
Variable Size 956303512 bytes
Database Buffers 620756992 bytes
Redo Buffers 7434240 bytes
Database mounted.
Database opened.
SQL> exit

Original article: ORA-27154: post/wait create failed

©2013 Linux cPanel WebHosting Blog. All Rights Reserved.

1st) First open the /etc/fstab file and check the volume group used for the swap.

~~~~~~~~~~~~
/dev/mapper/vg_test-lv_swap swap swap defaults 0 0
~~~~~~~~~~~~

In above example the VG is /dev/mapper/vg_test-lv_swap

2nd) Now set the swap off for the VG /dev/mapper/vg_test-lv_swap
swapoff -v /dev/mapper/vg_test-lv_swap

3rd) Create the filesystem for new swap partition
~~~~~~~~~~~~~~
mkfs.ext3 -b 4568 /dev/sda4
~~~~~~~~~~~~~~

In above example, we have used /dev/sda4

4th) Create the phyiscal volume

pvcreate /dev/sda4

5th) Check the status for the new free disk space

vgdisplay
6th) Now extend the volume group

vgextend vg_test /dev/sda4

7th) Now extend the size of a logical volume :

~~~~~~~~~~~~~~
lvresize /dev/mapper/vg_test-lv_swap -L +4G
~~~~~~~~~~~~~~

As per above command the new RAM swap memory value will be 4GB

8TH) Now format the new swap space:

mkswap /dev/mapper//vg_test-lv_swap

9th) Enable the extended logical volume:

swapon -va
Check the new swap value by using the following command

free -m

If you want to decrease the swap FROM 4G TO 3G  then run the following command

lvreduce -L 3G /dev/mapper/vg_test-lv_swap

Original article: How to increase RAM memory – II (LVM)

©2013 Linux cPanel WebHosting Blog. All Rights Reserved.

1) Check the swap partition by using the fdisk -l command.

For example swap partition is /dev/sda5

2nd) To enable the /swap partition

swapon /dev/sda5

3rd)To enable the swap at boot time, edit the /etc/fstab and add the following line:

/dev/sda5 swap swap defaults 0 0

Now we can change the swap value by creating the swapfile for swap memory.

To create the swapfile use the following command

dd if=/dev/zero of=/swapfile bs=1024 count=3145428

In above example, we have created the RAM swapfile with the 3G, change the value in “count” as per your requirement.

4th) Now make the swapfile as a swap

mkswap /swapfile

Run the following command to enable the swap

swapon /swapfile

For permanent swapfile swap memory add the entry in /etc/fstab, so that /swapfile will mount every time when server rebooted else you have mount it manually after every reboot.

/swapfile swap swap defaults 0 0

Verify the new RAM SWAP memory by using the following command.

cat /proc/swaps

or

free -m

If  your server having LVM based partition then refer to the following tutorial to increase the RAM swap memory on LVM based server.

Original article: How to increase RAM memory (SWAP).

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yum install nano -y

The above command will install the nano editor and you have to set the alias for the pico editor by using the nano command binary, refer to the following commands to enable the pico editor.

cd /usr/bin/

export EDITOR=”pico”

Now try to open/edit any by using the nano and pico command.

Original article: Install nano and pico command

©2013 Linux cPanel WebHosting Blog. All Rights Reserved.

This is the basic question which is asked in past thousands of time in recent but its come again and again. The actual major difference between samba and nfs is by configuring the Samba server, we can access the file from Linux to
Window and Window to Linux but by using the NFS server we can’t access it.

Samba’s SMB protocol permits the server machine to handle authentication, thus it will decide what files the shopper has access to supported the actual machine and user connecting. NFS by default trusts all shopper machines completely (it’s extremely not meant to share files to unsecured workstations) and lets the shopper machines handle authentication all on their own (once associate degree NFS server has been told to simply accept connections from a shopper machine the shopper does not need to any extent further server-side authentication, and
can do something it needs with the file system NFS offers it access to).

Original article: Difference between Samba and NFS servers

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for i in `grep –exclude=”*.cache” documentroot /var/cpanel/userdata/username/* | cut -d: -d’ ‘ -f2-` ;do cp -p /home/username/public_html/filename $i/ ;done

Make sure that you have replaced the username with the original account’s username and filename with the name of the file which you want to copy under the subdomains and addon domains.

Original article: Copy files under all subdomains/addon domains

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