This document discusses package management in Linux. It describes how package management allows installing, upgrading, and removing software packages from repositories. There are two main package formats: RPM packages used in systems like CentOS and Fedora, and DEB packages in Ubuntu and Debian. RPM-based systems can use either the lower-level RPM tool or higher-level YUM tool to manage packages and dependencies.

2. Package management
• It is a method of installing software(packages) on Linux
from software repositories.
• Repositories are servers from where we can download
packages.
• The features of package management applications are:
1. Package downloading
2. Dependency resolution
3. Quality control
• Install, reinstall, upgrade, and remove packages.

3. Package management
• Mainly two type packages;
1. rpm (redhat package manager).
extension - .rpm
OS-Centos,Fedora...
2. dpkg (debian package manger).
extension - .deb
OS-Ubundu,Kali Linux...
●
Centos have two package managing tool.
1. # rpm
2. # yum

4. Package management using rpm

It is a lower level tool.

It allows you to interact with individual packages.

Operating systems using rpm are:
- Centos
- Fedora
- SUSE
- OpenSuSE
- Mandriva

5. Package management using rpm

There are 5 basic modes for RPM command.
- Install
- Remove
- Upgrade
- Verify
- Query

6. Package management using rpm

Syntax of rpm:
# rpm [switch] [package name]

Check the architecture of system OS.
# arch

To check OS:
# vim /etc/issue
or
# vim /etc/centos-release

7. Package management using rpm

Steps :
1. # arch
2. # wget [link location]
(sites – rpm.pbone.net , rpmfind.net)
3. # rpm -ih [package name]

8. Package management using rpm
1. # rpm -ih [package name]
i – installation
h – hashing(status of installation)
2. # rpm -qa
q - query
a - all
3. # rpm -qf /usr/bin/ssh
f – file
4. # rpm -qc [package name]
c – configuration
5. # rpm -e [package name]
e - erase

9. Package management using rpm

Issues:
- Dependency error.
Ex : create repo
- it need packages such as
- deltarpm
- python delta rpm
# rpm -qRp [package name]

10. YUM-[YellowDog Updater Modified]

Used to install packages with dependency.

Syntax:
# yum install <package name> -y
1. # yum search <package name>
2. # yum list installed
3. # yum list all
4. # yum remove <package name> -y
5. # yum update <package name> -y
6. # yum check-update
7. # yum repolist enabled/disabled/all

11. YUM-[YellowDog Updater Modified]

Configuration file:
/etc/yum.repos.d

The files inside yum.repos.d is repository files

Repositary files will have the location from which packages can
be downloarded based on our OS architecture.

This location is servers

And servers are the repositories

12. Repositories

To enable extra repositories
1. EPEL repo (Extra Packages for Enterprise Linux)
- fastest repo
2. REMI repo
3. rpmforge repo