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Ubuntu 12.04 enable other user login – root

Dhaval Thakar — Thu, 10 May 2012 02:35:35 +0000

With latest 12.04 release there is no option to login as other user on login screen. Normally this is not required as login for all users appears on login screen.

This is required only when you try to login as root user.

To enable other user login, run following command.

sudo echo "greeter-show-manual-login=true" >> /etc/lightdm/lightdm.conf

We do not encourage readers to login as root, login with non-root user will keep your linux secure.

Ubuntu 12.04 enable other user login – root is a post from: LinuxReaders

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Install Xfce using Source – Fedora / Ubuntu

Dhaval Thakar — Tue, 08 May 2012 14:27:03 +0000

Latest version of Xfce is released.
If you wish to try this on your favorite distro, you’ll need to install from source.

Here we are using xfce 4.10.
Its been tested on Fedora 16 & Ubuntu 12.04.
Pl try this on test machine before trying on production machine.
Once you install using source, you’ll not receive updates from your distro for xfce related packages.

Download latest tarball

Install Dependencies
Fedora

yum groupinstall "X Software Development" -y
yum install libnotify-devel libgudev1-devel autoconf automake intltool pkgconfig glib glib2 glib2-devel gcc dbus-devel dbus-glib-devel gtk2-devel libwnck-devel -y

Ubuntu

apt-get install libgudev-1.0-dev libwnck-dev intltool libglib2.0-dev dbus-1-dbg libdbus-1-dev libdbus-glib-1-dev xserver-xorg-dev libgtk2.0-dev

Environment
export CFLAGS=”-O2 -pipe”

Following is the common command needs to be used to install all source packages.
#./configure –prefix=/usr –sysconfdir=/etc && make && make install
tar jxvf xfce-4.10.tar.bz2
cd src

You can copy & paste following commands, if all dependencies are installed you’ll get xfce session option on login screen. We are not using any script to verify if any packages is failed. Hence I’ll recommend yo copy & paste for one package installation at a time.

tar jxvf xfce4-dev-tools-4.10.0.tar.bz2
cd xfce4-dev-tools-4.10.0
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf libxfce4util-4.10.0.tar.bz2
cd libxfce4util-4.10.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf xfconf-4.10.0.tar.bz2
cd xfconf-4.10.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf  libxfce4ui-4.10.0.tar.bz2
cd libxfce4ui-4.10.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf  garcon-0.2.0.tar.bz2
cd garcon-0.2.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf exo-0.8.0.tar.bz2
cd exo-0.8.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf xfce4-panel-4.10.0.tar.bz2
cd xfce4-panel-4.10.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf thunar-volman-0.8.0.tar.bz2
cd thunar-volman-0.8.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf xfce4-settings-4.10.0.tar.bz2
cd xfce4-settings-4.10.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf xfce4-session-4.10.0.tar.bz2
cd xfce4-session-4.10.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf xfwm4-4.10.0.tar.bz2
cd xfwm4-4.10.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf xfdesktop-4.10.0.tar.bz2
cd xfdesktop-4.10.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf  xfce4-appfinder-4.10.0.tar.bz2
cd xfce4-appfinder-4.10.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf  gtk-xfce-engine-3.0.0.tar.bz2
cd gtk-xfce-engine-3.0.0
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf tumbler-0.1.25.tar.bz2
cd tumbler-0.1.25/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf Thunar-1.4.0.tar.bz2
cd Thunar-1.4.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf xfce4-power-manager-1.2.0.tar.bz2
cd xfce4-power-manager-1.2.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../
 
tar jxvf xfce4-settings-4.10.0.tar.bz2
cd xfce4-settings-4.10.0/
./configure --prefix=/usr --sysconfdir=/etc && make && make install
cd ../

Install Xfce using Source – Fedora / Ubuntu is a post from: LinuxReaders

Android – Install Indian Fonts

Dhaval Thakar — Fri, 04 May 2012 04:12:50 +0000

Download DroidIndia.ttf

If you are comfortable with ADB, copy & paste following commands on shell / cmd

adb shell "mount -o remount,rw /dev/block/stl9 /system"
adb shell "cp /system/fonts/DroidSansFallback.ttf /sdcard/"
adb push DroidIndia.ttf /system/fonts/DroidSansFallback.ttf
adb shell "chmod 777 /system/fonts/DroidSansFallback.ttf"

Otherwise, you can use file explorer to copy DroidIndia.ttf to /system/fonts
1) copy /system/fonts/DroidSansFallback.ttf to /sdcard/ #backup
2) copy DroidIndia.ttf as /system/fonts/DroidSansFallback.ttf
3) change permission to 644 / rw-r-r

Now reboot your phone to check if you get support for Indian languages,
I have tested this font only for hindi.

DroidIndia.ttf is copied from GT-I5801 I5801DDJP6 firmware, hence it should support most of Indian languages.

Pl note, we are not responsible if you cause any kind of damage to your phone.

Android – Install Indian Fonts is a post from: LinuxReaders

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Ubuntu 12.04- Howto Switch to Xfce

Dhaval Thakar — Thu, 26 Apr 2012 14:43:17 +0000

Like many others if you dislike gnome Or unity & prefer to use old simple desktop look, run following command to install xfce on your newly installed Ubuntu 12.04

sudo apt-get install xfce4

Now you have both unity & xfce, you can switch desktop at login screen.

If there are icons missing in file manager
goto –> Settings –> Settings Manager –> Apperance –> Icons –> Tango

Ubuntu 12.04- Howto Switch to Xfce is a post from: LinuxReaders

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Transmission Daemon -CentOS / Fedora / Ubuntu

Dhaval Thakar — Mon, 02 Apr 2012 11:24:29 +0000

Transmission is Torrent / Magnet link client vastly used on Linux, its available for almost all distros.
If you are willing to use it as headless / VM to download torrents with minimal installation on your CentOS / Fedora / RHEL distro following is the packages needs to be installed & configuration required to access transmission as web service.

here 192.168.1.1 is machine transmission daemon
192.168.1.0/24 is lan

CentOS
Install epel repo

rpm -ivh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-5.noarch.rpm
yum -y install transmission-daemon transmission-cli

Fedora

yum -y install transmission-daemon transmission-cli

Ubuntu

apt-get install transmission-daemon transmission-cli

Configure your machine ip / network to allow access to transmission daemon.
Make sure daemon is already stopped, otherwise changes may not work on start / restart.
CentOS

/etc/init.d/transmission-daemon stop
vi /var/lib/transmission/.config/transmission/settings.json
#from
    "rpc-whitelist": "127.0.0.1",
#to
    "rpc-whitelist": "192.168.1.*",
 
/etc/init.d/transmission-daemon start

Fedora 16
Fedora does not install transmission-daemon as a service.

killall transmission-daemon
vi ~/.config/transmission-daemon/settings.json
#from
    "rpc-whitelist": "127.0.0.1",
#to
    "rpc-whitelist": "192.168.1.*",
transmission-daemon

Ubuntu 11.10

/etc/init.d/transmission-daemon stop
vi /etc/transmission-daemon/settings.json
#from
    "rpc-whitelist": "127.0.0.1",
#to
    "rpc-whitelist": "192.168.1.*",
 
/etc/init.d/transmission-daemon start

Now you can access transmission using http://192.168.1.1:9091/
Ubuntu may ask for username & password. which is transmission. Thats because of following entry in settings.json
"rpc-authentication-required": false,

Transmission Daemon -CentOS / Fedora / Ubuntu is a post from: LinuxReaders

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XenServer- Take VM Backup using Bash

Dhaval Thakar — Mon, 26 Mar 2012 08:14:59 +0000

Following is the basic bash script to take vm backup using bash & send confirmation mail.
This script assumes you already have your backup storage mounted as /mnt/back/

#!/bin/bash 
#dpthakar@gmail.com
#http://www.linuxreaders.com
#
#this basic script is created to take xenserver guest backup using snapshots
#it will first of all create a snapshot for a specific vm, convert that snapshot to template, take backup of template & delete it
#ths script is tested only on standalone server NOT ON SERVER POOL
 
 
PATH=/opt/xensource/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
export PATH
BACKDATE=`date +%Y-%m-%d`
ADMIN=dpthakar@gmail.com
 
BACKDIR=/mnt/back/$BACKDATE/$HOSTNAME
echo -e "subject: backup done on $HOSTNAME \n" > /tmp/xen_back.mail
 
#create backup dir
if [ -d $BACKDIR ]
	then
		echo "Backup Dir Exists"
		echo "$BACKDIR Exists" >> /tmp/xen_back.mail
	else
		echo "Bakcup Dir does not exists, Creating"
		echo "$BACKDIR does not Exists, Creating" >> /tmp/xen_back.mail
		mkdir -p $BACKDIR
fi
 
 
#generate list of RUNNING VM ONLY
echo "Generating List of Running VMs"
xe vm-list power-state=running|grep name-label| grep -v "Control domain on host:"  | sed 's/     name-label ( RW): //g' > /tmp/xen_back1
echo -e "\n List of the VM for backup" >> /tmp/xen_back.mail
cat /tmp/xen_back1 >> /tmp/xen_back.mail
 
if [ $? -eq 0 ]
then
echo -e "vm list sucessfully generated \n"
echo -e "vm list sucessfully generated \n" >> /tmp/xen_back.mail
else
echo -e "vm list failed \n"
echo -e "vm list failed \n" >> /tmp/xen_back.mail
fi
 
 
#create a snapshot for each vm
VMLIST=`cat /tmp/xen_back1 | wc -l`
COUNT=0
until [ $VMLIST = $COUNT ]
do
COUNT=`expr $COUNT + 1`
VM=`gawk FNR==$COUNT /tmp/xen_back1`
 
#create snapshot 
echo "Creating Snapshot for $VM"
echo "Creating Snapshot for $VM" >> /tmp/xen_back.mail
SNAPSHOT=`xe vm-snapshot vm="$VM"  new-name-label="$VM"-$BACKDATE new-name-description="temporary snapshot" `
#or you can use following
#xe vm-snapshot-with-quiesce vm="$VM"  new-name-label="$VM"-$BACKDATE new-name-description="temporary snapshot"
 
if [ $? -eq 0 ]
then
echo -e "Snapshot for $VM Sucessfully created \n"
echo -e "Snapshot for $VM Sucessfully created \n" >> /tmp/xen_back.mail
else
echo -e "Snapshot for $VM FAILED \n"
echo -e "Snapshot for $VM FAILED \n" >> /tmp/xen_back.mail
fi
 
#set snapshot as template
echo "Setting snapshot $SNAPSHOT as Template for $VM backup"
echo "Setting snapshot $SNAPSHOT as Template for $VM backup" >> /tmp/xen_back.mail
xe template-param-set is-a-template=false uuid=$SNAPSHOT
 
if [ $? -eq 0 ]
then
echo -e "Setting snapshot $SNAPSHOT as Template for $VM backup was SUCESSFULL \n"
echo -e "Setting snapshot $SNAPSHOT as Template for $VM backup was SUCESSFULL \n" >> /tmp/xen_back.mail
else
echo -e "Setting snapshot $SNAPSHOT as Template for $VM backup was FAILED \n"
echo -e "Setting snapshot $SNAPSHOT as Template for $VM backup was FAILED \n" >> /tmp/xen_back.mail
fi
 
#backup from snapshot 
echo "Backing $SNAPSHOT for $VM"
echo "Export UUID=$SNAPSHOT" >> /tmp/xen_back.mail
xe vm-export vm=$SNAPSHOT filename=$BACKDIR/"$VM".xva compress=true
 
if [ $? -eq 0 ]
then
echo -e "Backup snapshot $SNAPSHOT for $VM was SUCESSFULL \n"
echo -e "Backup snapshot $SNAPSHOT for $VM was SUCESSFULL \n" >> /tmp/xen_back.mail
else
echo -e "Backup snapshot $SNAPSHOT for $VM was FAILED \n"
echo -e "Backup snapshot $SNAPSHOT for $VM was FAILED \n" >> /tmp/xen_back.mail
fi
 
#uninstall snapshot template
echo "Removing $SNAPSHOT for $VM"
echo "Remove UUID=$SNAPSHOT">> /tmp/xen_back.mail
xe vm-uninstall uuid=$SNAPSHOT force=true
 
if [ $? -eq 0 ]
then
echo -e "Uninstall of temporary snapshot $SNAPSHOT for $VM was SUCESSFULL \n"
echo -e "Uninstall of temporary snapshot $SNAPSHOT for $VM was SUCESSFULL \n" >> /tmp/xen_back.mail
else
echo -e "Uninstall of temporary snapshot $SNAPSHOT for $VM was FAILED \n"
echo -e "Uninstall of temporary snapshot $SNAPSHOT for $VM was FAILED \n" >> /tmp/xen_back.mail
fi
echo -e "\n" >> /tmp/xen_back.mail
done
 
cat /tmp/xen_back.mail | sendmail $ADMIN
rm -rf cat /tmp/xen_back*

XenServer- Take VM Backup using Bash is a post from: LinuxReaders

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XenServer- Take VM Snapshots using Bash

Dhaval Thakar — Mon, 19 Mar 2012 11:28:34 +0000

Following is the script that can be used to take snapshots of running vm,
once run it will send mail to ADMIN for the list of the VM snapshots

#!/bin/bash 
#dpthakar@gmail.com
#http://www.linuxreaders.com
#
#this basic script is created to take xenserver guest snapshots
#ths script is tested only on standalone server NOT ON SERVER POOL
 
 
PATH=/opt/xensource/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
export PATH
SNAPDATE=`date +%Y-%m-%d`
ADMIN=dpthakar@gmail.com
 
echo -e "subject: snapshots done on $HOSTNAME \n" > /tmp/xen_snapshot.mail
 
#generate list of RUNNING VM ONLY
echo -e "Generating List of Running VMs"
xe vm-list power-state=running|grep name-label| grep -v "Control domain on host:"  | sed 's/     name-label ( RW): //g' > /tmp/xen_snapshot1
echo -e "List of the VM for snapshot" >> /tmp/xen_snapshot.mail
cat /tmp/xen_snapshot1 >> /tmp/xen_snapshot.mail
echo -e "\n" >> /tmp/xen_snapshot.mail
#create a snapshot for each vm
VMLIST=`cat /tmp/xen_snapshot1 | wc -l`
COUNT=0
until [ $VMLIST = $COUNT ]
do
COUNT=`expr $COUNT + 1`
VM=`gawk FNR==$COUNT /tmp/xen_snapshot1`
 
#create snapshot 
echo "Creating Snapshot for $VM"
echo -e "Creating Snapshot for $VM" >> /tmp/xen_snapshot.mail
#SNAPSHOT=`xe vm-snapshot vm="$VM"  new-name-label="$VM"-$SNAPDATE new-name-description="backup snapshot" `
xe vm-snapshot vm="$VM"  new-name-label="$VM"-$SNAPDATE new-name-description="backup snapshot"
#or you can use following
#xe vm-snapshot-with-quiesce vm="$VM"  new-name-label="$VM"-$SNAPDATE new-name-description="backup snapshot"
if [ $? -eq 0 ]
then
echo -e "snapshot is Successful for $VM \n"
echo -e "snapshot is Successful for $VM \n" >> /tmp/xen_snapshot.mail
else
echo -e "snapshot failed for $VM \n"
echo -e "snapshot failed for $VM \n" >> /tmp/xen_snapshot.mail
fi
done
 
cat /tmp/xen_snapshot.mail | sendmail  $ADMIN
rm -rf /tmp/xen_snapshot*

For mails to work, make sure followings are mentioned in /etc/ssmtp/ssmtp.conf
mailhub=SMTP-SERVER rewriteDomain=-DOMAIN-NAME

XenServer- Take VM Snapshots using Bash is a post from: LinuxReaders

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CentOS / Fedora does not shut / reboot using virsh -KVM

Dhaval Thakar — Mon, 12 Mar 2012 09:56:54 +0000

Once you are done installing centos / fedora os on kvm as a guest / vm, you may face trouble shutting / reboot using virt-manager or virsh.

This can happen only if acpid is not installed or running.
Run following commands on centos / fedora guest to enable support for shut / reboot.

yum install acpid -y
chkconfig acpid on
service acpid start

CentOS / Fedora does not shut / reboot using virsh -KVM is a post from: LinuxReaders

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Starting a new blog?? Things to do…

Jigish Thakar — Thu, 08 Mar 2012 08:48:41 +0000

Whenever we read some really cool blog/ or hear a story of someone who made a fortune out of blog, we get excited and start our own blog.. thinking of earning more than sharing (yes most of us think that ). But if you really wanna make something big out of your blog, then there are some really basic things you need to keep in mind. And some of those are as given below.

1. Select great domain name/ blog title:
Yes blog name/ domain name (in case of self hosted blogs) plays a big part of your starting days of blog. Even it helps when it comes to one to one sharing, its not that these days readers remember every blog they read and visit them on daily basis. But when it comes to mouth to mouth publicity, simple names helps allot.

2. Select platform:
There are several blogging platforms available in free and trust me they are excellent and you can’t ask for anything more than what they serve. I personally prefer WordPress, Bloggers and Posterous. There is no other thought on wordpress being best. But others has some advantages over wordpress, with blogger you can have adsense easily & posterous is best when it comes to user friendliness. But yes if you wanna go for a self hosted blog, then wordpress is the only option out of these three. And there are lots and lots of free plugins and themes are available to make your wordpress blog more efficient and great in looks.

3. Don’t just copy paste:
Well this one is for people like me, I used to do just copy paste on my blog all the time. And one day panda opened my eyes and I deleted all the copied post, and currently TR has only the post written by me or my friends. Now why there is no point in just copy-paste, well readers can understand unless you are some big company, you can’t write on everything that comes on your way. Even a preparing small article needs a time. Also its not good for your search engine results. So no issues if you post less, but try not to just copy paste.

4. Give more importance to content than looks:
Again this is one is for people like me, well during starting days of my blog, all i used to do was experimenting with different themes. And after some days found out I was the only one who was visiting blog . So start with basic looks with best readablity and work more on content.

5. Don’t avoid submitting links to social networking site and other article submission sites:
I still find this task really difficult to do. Writing article is fun, but after article submitting links on bunch of social networking sites & article submission sites is a pain. Thank god we have services like ping.fm which handles Twitter, linkedin, facebook, google talk status. But when it comes to dzone, stumble, reditt, digg, facebook pages, google plus pages.. its worst to submit the article . But no matter how boring this job is, do not ignore this.

I have lots more things to discuss on same topic, but if I will keep writing then will never be able to publish this article so i might come with next article in future discussing more points on same topic.

Starting a new blog?? Things to do… is a post from: LinuxReaders

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Upgrade Bugzilla 4.0 to 4.2

Dhaval Thakar — Wed, 07 Mar 2012 12:58:09 +0000

With the latest release of Bugzilla, you get many features.
Such as…
HTML Bugmail
Improved Searching System
Accessibility Improvements
Auditing of All Changes Within Bugzilla
Displaying a Custom Field Value Based on Multiple Values of Another Field

Release Notes

Make sure you have all dependencies covered, such as Mysql, perl modules as mentioned in release notes.

You can refer Official Upgrade Doc Or below procedure.
Here, we assume you have 4.0 previously installed as following is tested on Bugzilla 4.0.x running on CentOS 6.2

Before you start with upgrade procedure.
Make a note of all changes you made in custom templates & delete it. As older templates will be replaced with newer version.

rm -rf /var/www/html/template/en/custom/*
 
Download Bugzilla
cd /root/
wget http://ftp.mozilla.org/pub/mozilla.org/webtools/bugzilla-4.2.tar.gz

Backup Existing html folder (or bugzilla folder)

cd /var/www/
tar zcvf bugzilla-40.tar.gz html/

Take MySql Backup

cd /root/
mysqldump -u root --databases bugs > bugs_back.sql

Extract Bugzilla

cd /tmp/
tar zxvf /root/bugzilla-4.2.tar.gz

Copy Content of bugzilla-4.2 to html / bugzilla folder

cd /var/www/html/
cp /tmp/bugzilla-4.2/* ./ -rfva
cp /tmp/bugzilla-4.2/.bzr* ./ -rfva
cp /tmp/bugzilla-4.2/.htaccess ./
chown apache: * -R

Verify Module dependency & run checksetup to complete upgrade

cd /var/www/html/
./checksetup.pl --check-modules
./checksetup.pl

Upgrade Bugzilla 4.0 to 4.2 is a post from: LinuxReaders