#This script installs Docker as offline bundle in RHEL 7

InstallDockerOfLine-RHEL-7.sh

#!/bin/bash 
# Author : Mansur Ul Hasan 
# Email : [email protected]
# This script has two functions one should be online & online system will be used as package 
# collector and will be used for package bundling 
# --onlybundle        This function will download Docker Offline binaries"
# --onlyinstall       This function install if you already preaper offline bundle"
# --bundleship        This create offline bundle 


DockerOfflinebuilder () {
## Collect Username & password for RHEL subscription 
# Above credentials should be used to login to REDHAT subcription server

        read -p "Enter RHEL Username : " username
        read -s "Enter RHEL Password : " password

# Login to RHEL subscription server 
# Subcriptions will allow you to download packages from RHEL repository servers 
        subscription-manager register --username=$username --password=$password

# After login to RHEL Customer portal check current subscription 
        subscription-manager list --available

# The next thing which is needed to attach system to RHEL pool with Pool ID 
        subscription-manager attach --pool=`subscription-manager list --available |grep "Pool ID:" |awk '{print $3}'`

# Add RHEL repository for extra packages these packages needed by Docker  
        subscription-manager repos --enable=rhel-7-server-extras-rpms

# Install some additional packages to setup the whole environment 
        yum update -y && yum install -y wget curl 
# EPEL repository for extra packages which can't be served from RHEL repository servers
        wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
        rpm ivh epel-release-latest-7.noarch.rpm

# Docker repository addition & also this part is responsible to download docker community edition 
# After downloading all the packages it will create tar ball 
# for just adding notes total number of packages for RHEL 7.6 with kernel version 3.10.0-957.el7.x86_64
# below is the output of all packages along with size downloaded total number of packages are 12 
# Docker is successfullyy installled with these packages

# +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
# -rw-r--r--. 1 root root    78260 Aug 11  2018 audit-libs-python-2.8.4-4.el7.x86_64.rpm
# -rw-r--r--. 1 root root   302120 Aug 15  2018 checkpolicy-2.5-8.el7.x86_64.rpm
# -rw-r--r--. 1 root root 27119348 Jun 13 18:02 containerd.io-1.2.6-3.3.el7.x86_64.rpm
# -rw-r--r--. 1 root root    39676 May 28 07:49 container-selinux-2.99-1.el7_6.noarch.rpm
# -rw-r--r--. 1 root root 19603424 Jun 27 15:24 docker-ce-18.09.7-3.el7.x86_64.rpm
# -rw-r--r--. 1 root root 14692900 Jun 27 15:24 docker-ce-cli-18.09.7-3.el7.x86_64.rpm
# -rw-r--r--. 1 root root    67704 Sep 11  2018 libcgroup-0.41-20.el7.x86_64.rpm
# -rw-r--r--. 1 root root   115336 Sep 14  2018 libsemanage-python-2.5-14.el7.x86_64.rpm
# -rw-r--r--. 1 root root   466796 Jan 21 11:16 policycoreutils-python-2.5-29.el7_6.1.x86_64.rpm
# -rw-r--r--. 1 root root    32828 Apr 15  2014 python-IPy-0.75-6.el7.noarch.rpm
# -rw-r--r--. 1 root root   635232 Aug 15  2018 setools-libs-3.3.8-4.el7.x86_64.rpm
# +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

        yum-config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
        yum-config-manager --enable docker-ce-nightly
        yum makecache fast
        mkdir ~/docker && cd ~/docker
        yumdownloader --resolve docker-ce 
        cd ../ && tar -czvf docker-18.09.tar.gz docker
        echo "Package download completed ..."
        
} 

InstallOfflineDocker () {

# This function only viable when offline packages are already downloaded 
# When executing this function ensure tar ball is palced on the location
# This function extract tarball and install docker binaries 
# Services will be start and enable by this function for docker 
    
        echo "Docker offline installation process begin.... "
        tar -xvf docker-18.09.tar.gz && cd docker
        rpm -ivh --replacefiles --replacepkgs *.rpm
        systemctl enable docker.service
        systemctl start docker.service
}

ShipBundle () {
        echo "Do you wish to ship this offline bundle to remote server ?? "
        read -p " Choice must be Y|y or N|n" agree
        if [ $agree -eq "Y" && $agree -eq "y" ];
        then
            echo "Enter destination IP Address : " destip
            echo "Enter destination username : " destuser
            echo "Enter Destination location : " destloc
            rsync -avr docker-18.09.tar.gz $destuser@$destip:$destloc/
        else 
                exit
        fi

}

case $1 in 
--onlybundle)
    DockerOfflinebuilder
;; 
--onlyinstall)
    InstallOfflineDocker
;; 
--bundleship)
    DockerOfflinebuilder
    ShipBundle
;;
*)
    echo "No valid parameters being passed "
    echo "      Please ensure only below params are allowed"
    echo "      --onlybundle        This function will download Docker Offline binaries"
    echo "      --onlyinstall       This function install if you already preaper offline bundle"
    echo "      --bundleship        This create offline bundle"
;;
esac