Building Google Cloud Platform Solutions

Instance templates

Before we can create an MIG, we need to define an instance template. Instance templates define a Compute Engine instance prototype with attributes such as its image and machine type. When creating a managed instance group, Compute Engine refers to the instance template to generate the VMs.

Our instance template will create a simple HTTP server serving traffic on port 80. If this is the first VM to do so in your project, you'll first need to create a firewall rule to allow HTTP traffic on that port. We'll be taking a closer look at this in the networking chapter but to create the firewall rule now, execute the script included in this book's source code under chapter_07/example_01/00-create-http-firewall-rule.sh.

With the ...