Setting ip in redhat,fedora and centos

For redhat, fedora and centos, to set ip temporarily, you can use ifconfig and route commands(you have to be root to do these steps)

1. Run the command below to set ip and netmask
# ifconfig eth0 10.20.1.10 netmask 255.255.255.0 up
where eth0 is the name of the interface, 255.255.255.0 is the netmask and up to activate the interface

2. run route command to set default gateway
# route add default gw 10.20.1.1
where 10.20.1.1 is your gateway ip

3. You can check the configuration that you have setup using commands route -n to see the gateway and ifconfig to see the ip address


To setup the ip and gateway permanently, follow below steps (You have to be root to do these steps)

1. Go to folder /etc/sysconfig/network-scripts
# cd /etc/sysconfig/network-scripts

2. Backup your existing configuration
# cp ifcfg-eth0 ifcfg-eth0.bak

3. Open ifcfg-eth0 with your favorite editor
# vi ifcfg-eth0

4. Add below line to the ifcfg-eth0 file to setup your ip

BOOTPROTO=static
DEVICE=eth0
IPADDR=10.20.1.20
NETMASK=255.255.255.0
NETWORK=10.20.1.0
ONBOOT=yes
TYPE=Ethernet

5. Save the file

6. Add below line to /etc/sysconfig/network to set your gateway
GATEWAY=10.20.1.1

7. Save and restart network
# /etc/init.d/network restart

8. Done. Check your newly created ip using ifconfig and gateway using route -n commands

MSCOSCONF2009

MSC Malaysia Open Source Software Conference(MSCOSCONF2009) is an open source conference that will be held in Malaysia on 31 May - 3 June, 2009, organized by MAMPU and MDEC of Malaysia. There will be great speakers presenting their stuff on the event, great activities and much more. For further details, visit http://www.mscmalaysia.my/osconf and http://www.mscoscon.my.

Installing virtualbox 2.2.0 on ubuntu 8.10

To install virtualbox is fairly easy. Just follow the instructions below:

1. Open /etc/apt/sources.list and add this line deb http://download.virtualbox.org/virtualbox/debian intrepid non-free

2. Import sun public-key and register it using apt-key (wget is for downloading, apt-key is for registering the key to your machine)
$ wget -q http://download.virtualbox.org/virtualbox/debian/sun_vbox.asc -O - | sudo apt-key add -
OK

3. Update your system's package index file
$ sudo apt-get update

4. Install virtualbox 2.2
$ sudo apt-get install virtualbox-2.2

Done, that's all :)

Adding local directory to apt sources.list

I faced this problem when trying to install the latest version of lyx, frontend for the famous LaTeX/TeX document processor. Lyx is available at the ubuntu main repo, but the version is kind of outdated. After checking at http://www.getdeb.net, a latest version is available. After downloading the lyx and lyx-common package from here, I tried to install both of them using "dpkg -i *.deb" but they have unsatisfied dependencies. One of the way to solve this is to download all the dependencies and put them inside one directory, and run "dpkg -i *.deb" but I think I wanna try another solution which is using apt to install them. This is where "Adding local directory to apt sources.list" comes into the picture. The steps will be explained below:

1. Create the directory to put all the deb files you downloaded, in this case I'll create /home/foo/debs
$ mkdir /home/foo/debs

2. Put all the downloaded deb files into the directory
$ mv /home/foo/Desktop/*.deb /home/foo/debs

3. Check the current priorities and section for the package, find entry named Section and Priority:
$ dpkg --info lyx_1.6.2-1~getdeb1_i386.deb

Here are some of the info:
Package: lyx
Section: editors
Priority: optional
Homepage: http://www.lyx.org/

4. Create override file. Override file is used to override the default priority and section setting of the package (refer to no. 3 for guide on how to check section and priority). Override file contains 3 columns: package, priority, section. Package is the name of the package, priority is low, medium, high or optional and section is the section to which it belongs.
Example of override file content:

## Override
#Package priority section
lyx low editors

5. Create Packages.gz inside /home/foo/debs
$ cd /home/foo/debs
$ sudo dpkg-scanpackages . override | gzip -c9 > Packages.gz

6. If you are too lazy to do the override file, you do not have to. Just change the "dpkg --scanpackages" command above to this:
$ cd /home/foo/debs
$ sudo dpkg-scanpackages . /dev/null | gzip -c9 > Packages.gz
If you follow this path, ignore step 4 and 5

7. Add this line to /etc/apt/sources.list
deb file:///home/foo/debs /

8. Resynchronize the package index files from their sources
$ sudo apt-get update

9. Install your application (in this case, lyx)
$ sudo apt-get install lyx


Apt will fetch the deb files from your local file directory also. Congratulations, you just created a local file repository in your own computer :)

Suse forgotten root password

In suse, if you forgot your root password, you can go to the single mode as usual. Steps are explained below:

1. Reboot the machine
2. When Startup Options(blue background in SLES) appear, choose Failsafe mode
3. In the Boot Options, append init=/bin/sh at the end of the line
4. Press Enter to boot
5. You will be presented with a shell. Change your password using command passwd root
6. Reboot the machine. root is now can be accessed using your new password