You want to automate the creation of a managed instance group. The VMs have many OS package dependencies. You want to minimize the startup time for new VMs in the instance group. What should you do?

Creating a custom VM image with pre-installed OS package dependencies significantly reduces startup time for new instances in a managed instance group. When a new VM is provisioned, it boots from this image, avoiding the need to download and install packages during startup. Deployment Manager is a suitable tool for automating the creation of the managed instance group, referencing this custom image. Using startup scripts (like with Terraform) or configuration management tools (like Puppet or Ansible) to install dependencies on boot would increase startup time, as each new VM would execute these installation steps. While these tools are valuable for ongoing configuration, they are less efficient for initial dependency provisioning when minimizing startup time is critical.