Vagrant execute command on specific guest after other guests are up

Question

I have the following Vagrantfile:

Vagrant.configure(VAGRANT_API_VERSION) do |config|
  config.vm.provider "virtualbox" do |vb|
    vb.memory = 1024
    vb.cpus = 2
  end

  config.vm.define :master do |master_config|
    master_config.vm.box = "centos/7"
    master_config.vm.host_name = 'saltmaster.local'
    master_config.vm.network "private_network", ip: "172.16.10.10"
    master_config.vm.synced_folder ".", "/vagrant", disabled: true
    master_config.vm.synced_folder "states", "/vagrant/states", type: "virtualbox"
    master_config.vm.synced_folder "pillar", "/vagrant/pillar", type: "virtualbox"

    master_config.vm.provision :salt do |salt|
      salt.master_config = "etc/master"
      salt.install_type = "git"
      salt.install_args = "v2016.11.7"
      salt.no_minion = true
      salt.install_master = true
      salt.verbose = true
      salt.colorize = true
      salt.bootstrap_options = "-P -c /tmp"
    end
  end

  config.vm.define :minion1 do |minion_config|
    minion_config.vm.box = "centos/7"
    minion_config.vm.host_name = 'saltminion1.local'
    minion_config.vm.network "private_network", ip: "172.16.10.11"
    minion_config.vm.synced_folder ".", "/vagrant", disabled: true

    minion_config.vm.provision :salt do |salt|
      salt.minion_config = "etc/minion1"
      salt.install_type = "git"
      salt.install_args = "v2016.11.7"
      salt.verbose = true
      salt.colorize = true
      salt.bootstrap_options = "-P -c /tmp"
    end
  end

  config.vm.define :minion2 do |minion_config|
    minion_config.vm.box = "centos/7"
    minion_config.vm.host_name = 'saltminion2.local'
    minion_config.vm.network "private_network", ip: "172.16.10.12"
    minion_config.vm.synced_folder ".", "/vagrant", disabled: true

    minion_config.vm.provision :salt do |salt|
      salt.minion_config = "etc/minion2"
      salt.install_type = "git"
      salt.install_args = "v2016.11.7"
      salt.verbose = true
      salt.colorize = true
      salt.bootstrap_options = "-P -c /tmp"
    end
  end

end

Now after all the machines are up and running, I want to execute a command on the salt master using master_config.vm.provision "shell", inline: "salt '*' state.apply".

But the problem is, once Vagrant finished provisioning minion2, it can't access the master_config machine anymore. I think there should be a way to execute that command, without having to execute vagrant ssh master -c stalt '*' state.apply. I don't want to use a command on the host. And the highstate needs to be applied AFTER all the minions are up, due to some networking related configurations and states.

Can someone help me out?

Answer 1

... continued from comments, making here for the example.

You can use the vagrant trigger plugin. As mentioned in the doc:

Starting from version 0.5.0, triggers can also be run as a provisioner

• you can target a specific instance (see https://github.com/emyl/vagrant-triggers#options)

so the following at the end of the file should work:

  config.vm.provision "trigger", :vm => "minion_config" do |trigger|
    trigger.fire do
      run "script"
    end
  end