Upgrading CentOS to 5.6

blue_print — Tue, 23 Aug 2011 01:50:45 GMT

If you have CentOS 5.5 of lower of this version installed, please take the backup anything you care about it.Then, you can update it to 5.6 using the steps given here.

Convert ext2 to ext3 file system

blue_print — Thu, 14 Jul 2011 04:31:18 GMT

The conversion procedure is very simple enough. Let us assume /dev/sda6 (ext2 now) mounted on /convert. You will be seeing fstb entries like,

Code:

/dev/sda6         /convert             ext2    defaults        0 0

Unmount the partition

Code:

umount /dev/sda6

Enable Journal (converting to ext3) using tune2fs command,

Code:

tune2fs -j /dev/sda6

Edit /etc/fstab and for /dev/sda6 change the file system type to ext3. Finally, the entry should be like this,

Code:

/dev/sda6         /convert             ext3    defaults        1 2

Mount the partition using mount command,

Code:
mount -a

If above command doesn�t work, reboot the system and check.

RPM commands

blue_print — Fri, 03 Jun 2011 08:41:53 GMT

RPM package is a powerful utility to manage the software in all major Linux distributions. RPMs can be used to,

Install packages
Remove packages
Upgrade packages
Verify packages

Here are some useful command to manage RPM packages,

1. Getting detailed information about the package httpd

Code:

rpm -qi httpd

2. Determining which package installed the file /etc/httpd/conf.d/httpd-portal.conf,

Code:

rpm -qf /etc/httpd/conf.d/httpd-portal.conf

3. Showing all the files installed my httpd

Code:

rpm -ql httpd

4. Viewing the documentation files for the command httpd,

Code:

rpm -qd httpd

5. Listing all files included in an rpm file,

Code:

rpm -qpl /mnt/iso/suse/i586/wget-1.10.2-78.i586.rpm

6. Verify if the package is installed or not,

Code:

rpm -qa | grep httpd

7. To check what has changed in the files on the system since the HTTPD rpm originally installed,

Code:

rpm -V httpd

8. Checking package to ensure its integrity and origin: (NOTE: gpg or pgp software must be installed on your system before you use this command)

Code:

rpm -K /mnt/iso/suse/i586/wget-1.10.2-78.i586.rpm

9. To install wget RPM package,

Code:

rpm -ivh /mnt/iso/suse/i586/wget-1.10.2-78.i586.rpm

10. Upgrading the package wget: (NOTE: if the package is not installed it will install it for You, like option �-ivh�),

Code:

rpm -Uvh /mnt/iso/suse/i586/wget-1.10.2-78.i586.rpm

11. Upgrade the package wget (if it exists already),

Code:

rpm -Fvh /mnt/iso/suse/i586/wget-1.10.2-78.i586.rpm

12. Removing the RPM package wget,

Code:

rpm -e wget

13. To list the configuration file of a package,

Code:

rpm -qc httpd

14. To display the list of all recently installed packages,

Code:

rpm -qa �last

15. To find out what dependencies httpd package has,

Code:

rpm -qR httpd

16. To find out what dependencies an rpm file has,

Code:

rpm -qpR /mnt/iso/suse/i586/wget-1.10.2-78.i586.rpm

17. To display list of configuration files for a command,

Code:

rpm -qcf /usr/sbin/httpd

LinuxQuestions.org - Blogs - blue_print

Upgrading CentOS to 5.6

Convert ext2 to ext3 file system

RPM commands