Vagrant execute script or command after every guest restart (vagrant up)

Question

I know about the provisioning script, but this is a different script that I am asking about. I want a script to be executed after every restart of the guest.

I am using shell provisioner.

config.vm.provision :shell, path: "vagrant/bootstrap.sh"

I can't put my commands in this script that I want to run after every restart.

Basically, I want one of my applications to be started when user executes vagrant up.

My guest is ubuntu 14.04 trusty and one solution I found was to do following on my guest -

sudo crontab -e
#add the following line 
@reboot sh /path/to/my_script_on_guest.sh

I can try to do this in my provisioning script, but sudo crontab -e asks for an editor and I have to kind of interactively add the line. Since the crontab file is not fixed I don't know if it is feasible to do one liner file edits like

echo '@reboot sh /path/to/my_script_on_guest.sh' >> crontab_file

I am guessing that this must be a guest OS specific thing.

Is this possible to achieve using Vagrant?

EDIT: corrected from ssh provisioner to shell provisioner.

Answer 1

you can use run: 'always'

config.vm.provision :shell, path: "vagrant/bootstrap.sh", run: 'always'

This will make sure your command are executed every time your VM is starting (vagrant up or vagrant reload)

If you need only certain commands to be always run, you can split your script

config.vm.provision :shell, path: "vagrant/bootstrap1.sh"
config.vm.provision :shell, path: "vagrant/bootstrap2.sh", run: 'always'
config.vm.provision :shell, path: "vagrant/bootstrap3.sh"

script will be run in order, bootstrap1 then 2 then 3 when the machine is first provisioned

any further time you run vagrant up (or reload) only bootstrap2 will be run