I regularly find myself wanting to quickly test out things on specific Linux distros. There are many ways to spin up VM, but I want something very quick and disposable.
After some experimenting, I settled on Vagrant, and came up with the following Vagrantfile:
- A list of all the major distros
- Using dedicated RFC1918 addresses
- Adds my SSH public key
- Default to 512M RAM and 1 CPU
- Easy to add custom provisioning shellcode
combined that with some dedicated RFC1918 addresses, and corresponding names.
There are 3 items involved:
Vagrant config
This is done in one Vagrantfile and looks like this:
Vagrantfile
# -*- mode: ruby -*-
# vi: set ft=ruby :
machines=[
{
:hostname => "wheezy",
:ip => "192.168.77.71",
:box => "debian/wheezy64"
},
{
:hostname => "jessie",
:ip => "192.168.77.72",
:box => "debian/jessie64"
},
{
:hostname => "stretch",
:ip => "192.168.77.73",
:cpus => 4,
:memory => 4096,
:box => "debian/stretch64"
},
{
:hostname => "trusty",
:ip => "192.168.77.74",
:box => "ubuntu/trusty64"
},
{
:hostname => "xenial",
:ip => "192.168.77.75",
:box => "ubuntu/xenial64",
:shellcode => "apt-get -yy install python-minimal",
},
{
:hostname => "bionic",
:ip => "192.168.77.76",
:box => "ubuntu/bionic64",
:shellcode => "apt-get -yy install python-minimal",
},
{
:hostname => "centos6",
:ip => "192.168.77.77",
:box => "centos/6"
},
{
:hostname => "centos7",
:ip => "192.168.77.78",
:box => "centos/7"
},
{
:hostname => "rhel6",
:ip => "192.168.77.79",
:box => "samdoran/rhel6"
},
{
:hostname => "rhel7",
:ip => "192.168.77.80",
:box => "generic/rhel7"
}
]
# To inject into each VM
mypubkey = File.readlines("#{Dir.home}/.ssh/id_rsa.pub").first.strip
Vagrant.configure("2") do |config|
machines.each do |machine|
config.vm.define machine[:hostname] do |node|
node.vm.box = machine[:box]
node.vm.hostname = machine[:hostname]
node.vm.provision 'shell', inline: "echo \"#{mypubkey}\" >> /home/vagrant/.ssh/authorized_keys", privileged: false
if machine.has_key? :shellcode
node.vm.provision 'shell', inline: machine[:shellcode]
end
node.vm.network "private_network", ip: machine[:ip]
node.vm.provider "virtualbox" do |vb|
vb.customize ["modifyvm", :id, "--memory", machine.has_key?(:memory) ? machine[:memory] : 512 ]
vb.customize ["modifyvm", :id, "--cpus", machine.has_key?(:cpus) ? machine[:cpus] : 1 ]
end
end
end
end
DNS
Add this to your /etc/hosts file:
#==== Vagrant distros 192.168.77.71 wheezy 192.168.77.72 jessie 192.168.77.73 stretch 192.168.77.74 trusty 192.168.77.75 xenial 192.168.77.76 bionic 192.168.77.77 centos6 192.168.77.78 centos7 192.168.77.79 rhel6 192.168.77.80 rhel7 #====
SSH configuration
Add this to your .ssh/config file:
# Vagrant distros Host wheezy jessie stretch trusty xenial bionic centos6 centos7 rhel6 rhel7 User vagrant UserKnownHostsFile /dev/null StrictHostKeyChecking no
At this moment you should be able to simply do:
vagrant up centos7 ssh centos7
and when you're done:
vagrant destroy centos7
Happy testing!