Can we add text to a file inside a vagrant vm during vagrant up?

[Soham Chakraborty]

Hi, 

I have a four node vagrant setup that I am using to test puppet. What I intend to do is to add the FQDN of the puppetmaster node to the 2nd line of the /etc/hosts of the other 3 nodes. The Vagrantfile is thus: 

# -*- mode: ruby -*-

# vi: set ft=ruby :

#

#

Vagrant.configure(2) do |config|

  config.vm.box = "ubuntu/trusty64"

  config.vm.provision "shell", path: "script.sh"

  config.vm.define "puppetmaster" do |puppetmaster|

    puppetmaster.vm.network :private_network, ip: "192.168.33.33"

    puppetmaster.vm.network :forwarded_port, guest: 80, host: 8080

    puppetmaster.vm.network :forwarded_port, guest: 8140, host: 8141

    puppetmaster.vm.hostname = "puppetmaster.example.com"

  end

  config.vm.define "web" do |web|

    web.vm.network :private_network, ip: "192.168.33.34"

    web.vm.network :forwarded_port, guest: 8140, host: 8142

    web.vm.hostname = "web.example.com"

  end

  config.vm.define "mail" do |mail|

    mail.vm.network :private_network, ip: "192.168.33.35"

    mail.vm.network :forwarded_port, guest: 8140, host: 8143

    mail.vm.hostname = "mail.example.com"

  end

  config.vm.define "db" do |db|

    db.vm.network :private_network, ip: "192.168.33.36"

    db.vm.network :forwarded_port, guest: 8140, host: 8144

    db.vm.hostname = "db.example.com"

  end

end

script.sh is used for updating the vm, otherwise puppet-common won't be installed. 

$ cat script.sh 

sudo apt-get update -y

sudo apt-get install puppet -y

With this setup, after the four machines boot up, I go to web, db and mail vms and do a sed -i "2i 192.168.33.33 puppetmaster.example.com puppet" /etc/hosts to include the FQDN of the puppetmaster host. 

1) Can this be accomplished by any method inside the Vagrantfile or in script.sh? 

2) Also, any critique to write the Vagrantfile better will be appreciated. I feel like maintaining the file like I do now can be a bit cumbersome when I add more machines or want to do specific things to specific nodes. I don't have a specific example right now, this is just a thought. 

Thanks guys!

[Alvaro Miranda Aguilera]

On Wed, Jul 27, 2016 at 6:19 PM, Soham Chakraborty <dec....@gmail.com> wrote:

sed -i "2i 192.168.33.33 puppetmaster.example.com puppet"

Hello,

Looks good, you could something like this

grep -i puppetmaster /etc/hosts || {

   echo "192.168.33.33 puppetmaster.example.com puppet" | tee -a /etc/hosts

}

Alvaro.

[pixel fairy]

also, the vagrant-hostmanager plugin does this for you. https://github.com/devopsgroup-io/vagrant-hostmanager