Requirements

This method works best with a connected computer with same OS and Version.
This enables one to ascertain the dependent packages that need to be downloaded by the Package Manager for the disconnected (air-gapped) computer.

sudo will only be used when necessary.

Centos 7 Example

On Redhat and Centos OS, tar and libnsl may need to be pre-installed as they are needed to unpack the installer runfile.

• 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 and ready for transferring to the disconnected (air-gapped) computer where they will be installed: ls -la -rw-rw-r--. 1 user user 4463036 Apr 3 21:12 glibc-2.17-307.el7.1.i686.rpm

• On the disconnected (air-gapped) computer we will now install the downloaded required packages

  # Install each of the downloaded required packages: sudo yum install glibc-2.17-307.el7.1.i686.rpm