Repository configuration in linux

Repositories / CommandLine

This page describes how to manage software repositories from the command line. (GUI tools are also available: Managing Repositories in Ubuntu or Kubuntu).

If you are using a minimal install or server install you will need to be familiar with a terminal based text editor like nano. If you are using a GUI install you can use Nano or GEdit.

The Basics

Ubuntu uses apt for package management. Apt stores a list of repositories or software channels in the file

and in any file with the suffix .list under the directory

See man sources.list for more about this storage mechanism.

By editing these files from the command line, we can add, remove, or temporarily disable software repositories.

Note: It’s always a good idea to backup a configuration file like sources.list before you edit it. To do so, issue the following command:

sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup

Typically, the beginning of the file /etc/apt/sources.list looks like this:

# sources.list #deb cdrom:[Ubuntu 13.10 _Saucy Salamander_ - Release i386 (20131016.1)]/ saucy main restricted # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http://ch.archive.ubuntu.com/ubuntu/ saucy main restricted deb-src http://ch.archive.ubuntu.com/ubuntu/ saucy main restricted #.

Explanation of the Repository Format

• All the lines beginning with one or two hashes (#) are comments, for information only.
• The lines without hashes are apt repository lines. Here’s what they say:
  • deb: These repositories contain binaries or precompiled packages. These repositories are required for most users.
  • deb-src: These repositories contain the source code of the packages. Useful for developers.
  • http://archive.ubuntu.com/ubuntu: The URI (Uniform Resource Identifier), in this case a location on the internet. See the official mirror list or the self-maintained mirror list to find other mirrors.
  • saucy is the release name or version of your distribution.
  • main & restricted are the section names or components. There can be several section names, separated by spaces.

  Other Versions

  

  • For other Ubuntu releases you would replace the ‘saucy’ with the current version you have installed (‘precise’, ‘quantal’, ‘raring’, ‘saucy’, ‘trusty’, . ) Type lsb_release -sc to find out your release.

  Adding Repositories

  Adding the Universe and Multiverse Repositories

  deb http://us.archive.ubuntu.com/ubuntu/ saucy universe deb-src http://us.archive.ubuntu.com/ubuntu/ saucy universe deb http://us.archive.ubuntu.com/ubuntu/ saucy-updates universe deb-src http://us.archive.ubuntu.com/ubuntu/ saucy-updates universe

  There are four similar lines for ‘multiverse’.

  sudo add-apt-repository "deb http://us.archive.ubuntu.com/ubuntu/ saucy universe multiverse" sudo add-apt-repository "deb http://us.archive.ubuntu.com/ubuntu/ saucy-updates universe multiverse"

  

  Depending on your location, you should replace ‘us.’ by another country code, referring to a mirror server in your region. Check sources.list to see what is used!

  Type lsb_release -sc to find out your release. You may repeat the commands with «deb-src» instead of «deb» in order to install the source files.

  Adding Partner Repositories

  deb http://archive.canonical.com/ubuntu saucy partner deb-src http://archive.canonical.com/ubuntu saucy partner

  

  Be aware that the software contained within this repository is NOT open source.

Adding Other Repositories

There are some reasons for which you might want to add non-Ubuntu repositories to your list of software sources. Caution: To avoid trouble with your sytem, only add repositories that are trustworthy and that are known to work on Ubuntu systems!

You can add custom software repositories by adding the apt repository line of your software source to the end of the sources.list file. It should look something like this:

deb http://mirror3.ubuntulinux.nl/ hardy-seveas freenx

Adding Launchpad PPA Repositories

• The command updates your sources.list file or adds/edits files under sources.list.d/. Type man add-apt-repository for detailed help.
• If a public key is required and available it is automatically downloaded and registered.
• Should be installed by default. On older or minimal Ubuntu releases, you may have to install software-properties-common and/or python-software-properties first (sudo apt-get install python-software-properties)

sudo add-apt-repository ppa:

Enabling Repositories with a (non-interactive) Script

This section seemed obsolete due to the add-apt-repository command, thus it has been removed.

Suggestions & Recommendations

• It is always a good idea to back up configuration files like /etc/apt/sources.list before you begin editing. You can then revert your changes if needed.
• If you decide to add other repositories to sources.list, make sure that the repository is meant to work (and known to work) with Ubuntu. Repositories that are not designed to work with your version of Ubuntu can introduce inconsistencies in your system and might force you to re-install. Also, make sure that you really need to add external repositories as the software package(s) you are looking for may already have been introduced into the official repositories!
• Please keep in mind that it may not be legal (typically because of export restrictions) to enable some non-Ubuntu software repositories in some countries.
• You may be asked enter a security key when adding a non-Ubuntu repository to your sources. See Managing Authentication Keys for instructions.
• Remember to retrieve updated package lists by issuing a sudo apt-get update when you’re done editing sources.list.

Further Reading

Repositories/CommandLine (последним исправлял пользователь 2580DCEA 2015-07-27 15:42:33)

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Configure YUM Repository On Linux

YUM is the Linux package manager that is able to fetch the information about the available package, download the package,install,uninstall and update the package. It also help us to update the system when the update is available. YUM is very similar to the rpm command, it is more smarter than rpm because it does the automatic installation of dependent package required by the installation package. YUM can be configured with new,additional or updating the source of the package and package can be installed using trusted repository source only. Trusted repository meant that source repository comes with the verified the gpg keys which can be enabled in the repository configuration file, if the gpg key does not match with the repository key YUM will not install the package.

Configuration:

YUM configuration files can be found on /etc directory. /etc/yum.conf is the main global file, it contains the information of cache directory, log file, debug info,etc…

# PUT YOUR REPOS HERE OR IN separate files named file.repo

where as /etc/yum.conf.d directory contains additional repository source files. If you need to setup any new repository, here you have to start by creating the repo file ending with .repo extension. Here is the small tutorial which help you to setup the yum repository for your local network installation, before creating the repo you need to have the some information about source which contains rpm packages and xml ( RPM index) file.

The typical repo file will look like below.

[epel]name=Extra Packages for Enterprise Linux 6 – $basearch baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch

From the above you can you can see [epel] is the unique section name which contains the repository information

1. name=Extra Packages for Enterprise Linux 6 – $basearch – Name of the repository

2. baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch – it is the url where the repository localted, it can be http,ftp or local file ( http:/path/to/repo, ftp://path/to/repo, file:///path/to/rep respectively).

3. enabled – Enable or disable the repository

4. gpgcheck – Enable or Disable the gpg check

5. gpgkey = Location of the gpg key if you have enabled the gpg check option above.

Verification:

Once you have finished off the configuration, just enter the following command to verify the configuration file. epel refers the name of the section.

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