Ubuntu – How to create a local APT repository

aptrepository

I would like to build my own local repository on my LAN, so that machines on the LAN can update and upgrade from it. I want to download the packages and store them on my local server so that I can update, upgrade, install, etc, from it without using the internet.

Best Answer

  • From the Ubuntu Help wiki:

    There are 4 steps to setting up a simple repository for yourself

    1.Install dpkg-dev
    2.Put the packages in a directory
    3.Create a script that will scan the packages and create a file apt-get update can read
    4. Add a line to your sources.list pointing at your repository

    Install dpkg-dev

    Type in a terminal

    sudo apt-get install dpkg-dev
    

    The Directory

    Create a directory where you will keep your packages. For this example, we'll use /usr/local/mydebs.

    sudo mkdir -p /usr/local/mydebs
    

    Now move your packages into the directory you've just created.

    Previously downloaded Packages are generally stored on your system in the /var/cache/apt/archives directory. If you have installed apt-cacher you will have additional packages stored in its /packages directory.

    The Script update-mydebs

    It's a simple three liner:

    #! /bin/bash
     cd /usr/local/mydebs
     dpkg-scanpackages . /dev/null | gzip -9c > Packages.gz
    

    Cut and paste the above into gedit, and save it as update-mydebs in ~/bin. (the tilde '~' means your home directory. If ~/bin does not exist, create it: Ubuntu will put that directory in your PATH. It's a good place to put personal scripts). Next, make the script executable:

    chmod u+x ~/bin/update-mydebs
    
    How the script works:
    

    dpkg-scanpackages looks at all the packages in mydebs, and the output is compressed and written to a file (Packages.gz) that apt-get update can read (see below for a reference that explains this in excruciating detail). /dev/null is an empty file; it is a substitute for an override file which holds some additional information about the packages, which in this case is not really needed. See deb-override(5) if you want to know about it.

    Sources.list

    add the line

    deb file:/usr/local/mydebs ./
    

    to your /etc/apt/sources.list, and you're done.

    CD Option

    You can burn the directory containing the debs to a CD and use that as a repository as well (good for sharing between computers). To use the CD as a repository, simply run

    sudo apt-cdrom add
    

    Using the Repository

    Whenever you put a new deb in the mydebs directory, run

    sudo update-mydebs
    sudo apt-get update
    

    Now your local packages can be manipulated with Synaptic, aptitude and the apt commands: apt-get, apt-cache, etc. When you attempt to apt-get install, any dependencies will be resolved for you, as long as they can be met.

    Badly made packages will probably fail, but you won't have endured dpkg hell.

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