[networking] How do I increase the RAM and set up host-only networking in Vagrant?

I would like to increase the RAM to at least 1 GB and I would like to configure “Host-Only” networking to use "199.188.44.20".

This is my Vagrantfile:

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

Vagrant::Config.run do |config|

    config.vm.customize ["modifyvm", :id, "--memory", 1024]

    config.vm.network :hostonly, "199.188.44.20"

    config.vm.define :web do |web_config|
        web_config.vm.box = "lucid32"
        web_config.vm.forward_port 80, 8080

        web_config.vm.provision :puppet do |puppet|
            puppet.manifests_path = "manifests"
            puppet.manifest_file = "lucid32.pp"
        end
    end

    config.vm.define :web2 do |web2_config| 
        web2_config.vm.box = "lucid32"
        web2_config.vm.forward_port 80, 8081

        web2_config.vm.provision :puppet do |puppet|
            puppet.manifests_path = "manifests"
            puppet.manifest_file = "myweb.pp"
        end
    end
end

However, when I run vagrant up I am getting:

The VM failed to remain in the "running" state while attempting to boot. This is normally cause by a misconfiguration or host system incompatibles. Please open the VirtualBox GUI and attempt to boot the virtual machine manually to get more informative error message

And, I am getting a connection refuse error when I try to log in to the VM.

You can easily increase your VM's RAM by modifying the memory property of config.vm.provider section in your vagrant file.

config.vm.provider "virtualbox" do |vb|
 vb.memory = "4096"
end

This allocates about 4GB of RAM to your VM. You can change this according to your requirement. For example, following setting would allocate 2GB of RAM to your VM.

config.vm.provider "virtualbox" do |vb|
 vb.memory = "2048"
end

Try removing the config.vm.customize ["modifyvm", :id, "--memory", 1024] in your file, and adding the above code.

For the network configuration, try modifying the config.vm.network :hostonly, "199.188.44.20" in your file toconfig.vm.network "private_network", ip: "199.188.44.20"

To increase the memory or CPU count when using Vagrant 2, add this to your Vagrantfile

Vagrant.configure("2") do |config|
    # usual vagrant config here

    config.vm.provider "virtualbox" do |v|
        v.memory = 1024
        v.cpus = 2
    end
end

Since Vagrant 1.1 customize option is getting VirtualBox-specific.

The modern way to do it is:

config.vm.provider :virtualbox do |vb|
  vb.customize ["modifyvm", :id, "--memory", "256"]
end

I could not get any of these answers to work. Here's what I ended up putting at the very top of my Vagrantfile, before the Vagrant::Config.run do block:

Vagrant.configure("2") do |config|
  config.vm.provider "virtualbox" do |vb|
    vb.customize ["modifyvm", :id, "--memory", "1024"]
  end
end

I noticed that the shortcut accessor style, "vb.memory = 1024", didn't seem to work.