In order for an automated system to be able to connect to your VM and administer it - you will need to be able to connect to it using SSH keys. You've done this in both OPS235and OPS335.

Create a new SSH key on your main machine VM with your regular user. Please avoid using root on your development machine. Then set things up so that your regular user on your main machine VM can SSH to the slave1 VM as root without putting in a password.