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

    First we check if tar package is installed:
    rpm -q tar.x86_64
    tar-1.26-35.el7.x86_64
    tar # tar package is installed.
    We # We will only consider downloading and installing it later if we find we are unable to unpack the Opmantek Installer Runfile.


    Next # Next we check if libnsl package is installed:
    rpm -q libnsl
    package libnsl is not installed
    libnsl # libnsl is not installed.


    # From the above checks on this disconnected (air-gapped) computer, we have ascertained that the following packages are needed:

    linbnsl



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

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


    # Download each of the dependent packages:
    yumdownloader libnsl

    Loaded plugins: fastestmirror
    Loading mirror speeds from cached hostfile
    epel/x86_64/metalink | 26 kB 00:00:00
    * base: centos.mirror.serversaustralia.com.au
    * epel: mirror.xeonbd.com
    * extras: centos.mirror.serversaustralia.com.au
    * updates: mirror.nsw.coloau.com.au
    base | 3.6 kB 00:00:00
    epel | 4.7 kB 00:00:00
    extras | 2.9 kB 00:00:00
    updates | 2.9 kB 00:00:00
    No Match for argument libnsl
    Nothing to download
    # At first sight it appears we don't need libnsl for the OS + Version we are running this example on.
    # If the Opmantek Installer Runfile fails to unpack we may need to download this package from an OS Repository that is not enabled by default.


    # Since we don't have any package to download in this example we will download the tar package.
    # We will assume for the purposes of this example that the tar package needs to be updated to a newer version.
    # The command to download tar package with dependencies is:
    yumdownloader --resolve tar


    # 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 865848 Nov 12 2018 tar-1.26-35.el7.x86_64.rpm



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

    # Install each of the downloaded required packages.
    # Since we don't have any package to install in this example we will install the tar package.
    # We will assume for the purposes of this example that the tar package needs to be updated to a newer version.
    sudo yum install tar-1.26-35.el7.x86_64.rpm


...

  1. 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/# First we check if tar package is installed:
    type tar
    tar is /bin/tar
    # tar package is installed
    # We will only consider downloading and installing it later if we find we are unable to unpack the Opmantek Installer Runfile.


    # 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 apt-cache show tar
    apt-cache show tar|grep "Pre-Depends:"|sed -e 's/Pre-Depends:\s\+//' -e 's/,\s*/\n/g'|sort|uniq

    libacl1 (>= 2.2.51-8)
    libc6 (>= 2.17)
    libselinux1 (>= 1.32)

    # Now we check each package and package-version against the dependency lists above:
    dpkg -s libacl1|grep -e "Status:" -e "Version:"
    Status: install ok installed
    Version: 2.2.52-3+b1

    dpkg -s libc6|grep -e "Status:" -e "Version:"Status: install ok installed
    Status: install ok installed
    Version: 2.24-11+deb9u4

    dpkg -s libselinux1|grep -e "Status:" -e "Version:"
    Status: install ok installed
    Version: 2.6-3+b3

    # From the above checks on this disconnected (air-gapped) computer, we have ascertained that no packages are needed.


  2. Using the connected computer with same OS and Version we would now fetch the pre-installation required packages:

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


    # Download each of the dependent packages, here using libacl1 as an example, even though it is not actually needed in this case:
    apt-get download libacl1

    Get:1 http://ftp.us.debian.org/debian stretch/main amd64 libacl1 amd64 2.2.52-3+b1 [28.1 kB]
    Fetched 28.1 kB in 1s (16.6 kB/s)


    # 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 libacl1_2.2.52-3+b1_amd64.deb


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

    # Install each of the downloaded required packages, here using libacl1 as an example, even though it is not actually needed in this case:
    sudo apt-get install libacl1_2.2.52-3+b1_amd64.deb