Add all supported deployments; adjust box sizes to reflect a very bad case scenario

Vagrantfile

@@ -2,46 +2,66 @@
 # -*- mode: ruby -*-
 # vi: set ft=ruby :
 
+ip = 2
+machines = [
+  {
+    'iso' => "debian/buster64",
+    'host' => "buster"
+  },
+  {
+    'iso' => "generic/ubuntu2004",
+    'host'  => "focal"
+  }
+]
+
 Vagrant.configure("2") do |config|
-  config.vm.box = "debian/buster64"
   config.vm.provider :virtualbox do |vb|
-    vb.customize ["modifyvm", :id, "--cpus", 4, "--memory", 4096]
+    vb.customize ["modifyvm", :id, "--cpus", 1, "--memory", 512]
   end
   config.vm.provider :libvirt do |v|
-    v.memory = 4096
-    v.cpus = 4
+    v.memory = 512
+    v.cpus = 1
     v.nested = true
   end
   config.vm.provider :kvm do |kvm|
-    kvm.memory_size = '4096m'
+    kvm.memory_size = '512m'
   end
 
   # Network config: Since it's a mail server, the machine must be connected
   # to the public web. However, we currently don't want to expose SSH since
   # the machine's box will let anyone log into it. So instead we'll put the
   # machine on a private network.
-  config.vm.hostname = "mailinabox.lan"
-  config.vm.network "private_network", ip: "192.168.50.4"
   config.vm.synced_folder ".", "/vagrant", nfs_version: "3"
-  #, :mount_options => ["ro"]
 
-  config.vm.provision "shell", :inline => <<-SH
-    # Set environment variables so that the setup script does
-    # not ask any questions during provisioning. We'll let the
-    # machine figure out its own public IP.
-    export NONINTERACTIVE=1
-    export PUBLIC_IP=192.168.50.4
-    export PUBLIC_IPV6=auto
-    export PRIVATE_IP=192.168.50.4
-    export PRIMARY_HOSTNAME=auto
-    export SKIP_NETWORK_CHECKS=1
-    # Start the setup script.
-    cd /vagrant
-    setup/start.sh
-    # After setup is done, fully open the ssh ports again
-    ufw allow ssh
-SH
-  config.vm.provision "shell", run: "always", :inline => <<-SH
-    service mailinabox restart
-SH
+  (0..1).each do |n|
+    node = machines[n]
+    config.vm.define node['host'] do |m|
+      m.vm.box = node['iso']
+      m.vm.hostname = "#{node['host']}.mailinabox.lan"
+      m.vm.network "private_network", ip: "192.168.168.#{ip+n}"
+
+      m.vm.provision "shell", :inline => <<-SH
+        # Make sure we have IPv6 loopback (::1)
+        sysctl -w net.ipv6.conf.lo.disable_ipv6=0
+        # Set environment variables so that the setup script does
+        # not ask any questions during provisioning. We'll let the
+        # machine figure out its own public IP.
+        export NONINTERACTIVE=1
+        export PUBLIC_IP=192.168.168.#{ip+n}
+        export PUBLIC_IPV6=auto
+        export PRIVATE_IP=192.168.168.#{ip+n}
+        export PRIMARY_HOSTNAME=\"#{node['host']}.mailinabox.lan\"
+        export SKIP_NETWORK_CHECKS=1
+        # Start the setup script.
+        cd /vagrant
+        setup/start.sh
+        # After setup is done, fully open the ssh ports again
+        ufw allow ssh
+  SH
+
+        m.vm.provision "shell", run: "always", :inline => <<-SH
+          service mailinabox restart
+  SH
+    end
+  end
 end