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  • On the disconnected (air-gapped) computer we will firstly determine which pre-installation required packages need to be downloaded:

    # Navigate to a clean directory to download packages to
    mkdir -p /tmp/omk_opXyz_packages
    cd /tmp/omk_opXyz_packages/


    # Extract the list of dependent packages - I've used sort and formatted the results
    # to make the needed comparison to those packages already installed easier:
    # to see  the unsorted results run command yum -q deplist tar
    yum -q deplist tar|grep -e "package:" -e "provider:"|sed -r -e 's/^\s*(package|provider):\s+(.+?)$/\2/' -e 's/ /\t\t\t\t/'|sort|uniq

    bash.x86_64                                  4.2.46-34.el7
    glibc.i686                                       2.17-307.el7.1
    glibc.x86_64                                 2.17-307.el7.1
    info.x86_64                                   5.1-5.el7
    libacl.x86_64                                2.2.51-15.el7
    libselinux.x86_64                        2.5-15.el7
    tar.x86_64                                     2:1.26-35.el7


    # libnsl is not needed in this example as no package is returned:
    yum -q deplist libnsl


    # Now we grep from the list yum returns of installed packages THAT WE ALREADY HAVE on this disconnected (air-gapped) computer
    yum list installed|grep -e "^bash.x86_64" -e "^glibc.i686" -e "^glibc.x86_64" -e "^info.x86_64" -e "^libacl.x86_64" -e "^libselinux.x86_64" -e "^tar.x86_64"|sort

    bash.x86_64                                  4.2.46-34.el7                      @anaconda
    glibc.x86_64                                  2.17-307.el7.1                   @anaconda
    info.x86_64                                   5.1-5.el7                              @anaconda
    libacl.x86_64                                 2.2.51-15.el7                     @anaconda
    libselinux.x86_64                         2.5-15.el7                           @anaconda
    tar.x86_64                                      2:1.26-35.el7                     @anaconda


    # I have crossed out the packages this disconnected (air-gapped) computer already has up to date versions of, which leaves us with the following packages needed:

    glibc.i686                                       2.17-307.el7.1

                

  • Using the connected computer with same OS and Version we will now fetch the pre-installation required packages:

    # Download each of the dependent packages:
    yumdownloader glibc.i686

    Loaded plugins: fastestmirror
    Loading mirror speeds from cached hostfile
    epel/x86_64/metalink | 4.4 kB 00:00:00
    * base: mirror.nsw.coloau.com.au
    * epel: fedora.melbourneitmirror.net
    * extras: mirror.nsw.coloau.com.au
    * updates: mirror.nsw.coloau.com.au
    base | 3.6 kB 00:00:00
    extras | 2.9 kB 00:00:00
    updates | 2.9 kB 00:00:00
    glibc-2.17-307.el7.1.i686.rpm

    # Downloaded packages will now be in the current directory:
    ls -la

    -rw-rw-r--. 1 user user 4463036 Apr 3 21:12 glibc-2.17-307.el7.1.i686.rpm