The current virtual machine is a VirtualBox virtual machine, using Vagrant allows you to easily create a Virtual Machine from a script. You will require both bits of software downloaded and installed onto your machine.

When both of these are installed you can create a directory and copy the below code into a file with no extension:

Vagrant File

# -*- mode: ruby -*-
# vi: set ft=ruby :

# Making sure guest additions is installed
unless Vagrant.has_plugin?("vagrant-vbguest")
  raise 'vbguest is not installed! Please install it: vagrant plugin install vagrant-vbguest'
end

unless Vagrant.has_plugin?("vagrant-reload")
  raise 'vagrant-reload is not installed! Please install it: vagrant plugin install vagrant-reload'
end

$shared_folder_path = "../data"
# Checking shared folder exists if not create it
unless File.exists?($shared_folder_path)
  Dir.mkdir($shared_folder_path)
end


# All Vagrant configuration is done below. The "2" in Vagrant.configure
# configures the configuration version (we support older styles for
# backwards compatibility). Please don't change it unless you know what
# you're doing.
Vagrant.configure("2") do |config|
  # The most common configuration options are documented and commented below.
  # For a complete reference, please see the online documentation at
  # https://docs.vagrantup.com.

  # Every Vagrant development environment requires a box. You can search for
  # boxes at https://vagrantcloud.com/search.
  config.vm.box = "centos/7"

  # Disable automatic box update checking. If you disable this, then
  # boxes will only be checked for updates when the user runs
  # `vagrant box outdated`. This is not recommended.
  config.vm.box_check_update = true

  # Create a forwarded port mapping which allows access to a specific port
  # within the machine from a port on the host machine. In the example below,
  # accessing "localhost:8080" will access port 80 on the guest machine.
  # NOTE: This will enable public access to the opened port
  # config.vm.network "forwarded_port", guest: 80, host: 8080

  # Create a forwarded port mapping which allows access to a specific port
  # within the machine from a port on the host machine and only allow access
  # via 127.0.0.1 to disable public access
  # config.vm.network "forwarded_port", guest: 80, host: 8080, host_ip: "127.0.0.1"
  # config.vm.network "forwarded_port", guest: 5432, host: 8084, host_ip: "127.0.0.1"

  # Create a private network, which allows host-only access to the machine
  # using a specific IP.
  # config.vm.network "private_network", ip: "192.168.33.10"

  # Create a public network, which generally matched to bridged network.
  # Bridged networks make the machine appear as another physical device on
  # your network.
  # config.vm.network "public_network"

  # Share an additional folder to the guest VM. The first argument is
  # the path on the host to the actual folder. The second argument is
  # the path on the guest to mount the folder. And the optional third
  # argument is a set of non-required options.
  # config.vm.synced_folder "../data", "/vagrant_data"
  config.vm.synced_folder $shared_folder_path, "/vagrant_data"

  # Provider-specific configuration so you can fine-tune various
  # backing providers for Vagrant. These expose provider-specific options.
  # Example for VirtualBox:
  #
  # config.vm.provider "virtualbox" do |vb|
  #   # Display the VirtualBox GUI when booting the machine
  #   vb.gui = true
  #
  #   # Customize the amount of memory on the VM:
  #   vb.memory = "1024"
  # end
  config.vm.provider "virtualbox" do |vb|
     vb.name = "Postgres_DB_Server_VM"
     vb.memory = 4096
  end
  #
  # View the documentation for the provider you are using for more
  # information on available options.

  # Enable provisioning with a shell script. Additional provisioners such as
  # Puppet, Chef, Ansible, Salt, and Docker are also available. Please see the
  # documentation for more information about their specific syntax and use.
  # config.vm.provision "shell", inline: <<-SHELL
  #   apt-get update
  #   apt-get install -y apache2
  # SHELL
  config.vm.provision "shell", inline: <<-SHELL
    ius_rpm_url="https://centos7.iuscommunity.org/ius-release.rpm"
    postgres_rpm_url="https://download.postgresql.org/pub/repos/yum/11/redhat/rhel-7-x86_64/pgdg-centos11-11-2.noarch.rpm"
    sudo yum update -y
    sudo yum upgrade -y
    # Installing Inline With Upstream Stable IUS (Installs current Linux packages for current OS build) and epel-release
    sudo yum install -y ${ius_rpm_url} epel-release
    curl -O ${postgres_rpm_url}
    sudo yum install -y $(basename ${postgres_rpm_url})
    sudo yum install -y postgresql11-server postgresql11-contrib
    # Cleaning up - Removing Postgres file
    rm -f $(basename ${postgres_rpm_url})
    # Postgres Setup
    # Initialise DataBase
    sudo /usr/pgsql-11/bin/postgresql-11-setup initdb
    # Restart DataBase
    sudo systemctl start postgresql-11
    # Enable PostgresSQL launch on Reboot
    sudo systemctl enable postgresql-11
    # Adding pg_config to PATH
    export PATH=$PATH:/usr/pgsql-11/bin
  SHELL
  # Reloading VM
  config.vm.provision :reload
  
end

This is the file Vagrant will read and create a Virtual Machine once it has run once, this will give you a base VM to configure with Postgres 11 on.

Please read https://www.vagrantup.com/docs to familiarize yourself with Vagrant.

Vagrant Commands

To Initialize the environment:

vagrant init

To start the box:

vagrant up

To stop the box:

vagrant halt

To destroy the VM:

vagrant destroy

To ssh in:

vagrant ssh

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