NOTE: if you are going to use GCP Autoscaling for Stream Managers, you do not need to reserve a static IP address.

It is critical that the Stream Manager have a static IP address, so that in the event that the instance is rebooted, it will retain the same public IP address. You can reserve a static IP address via the Google Cloud SDK. Choose the region in which you wish to host the stream manager:

gcloud compute --project <your-project-id> addresses create streammanagerip --region <preferred-region>

You can also reserve a static IP address via the Google Cloud Console. Navigate to VPC Networks, External IP Addresses and assign an IP.

Google cloud offers two types of static IP addresses- Premium and Standard. The Premium IP addresses (default selection) are optimized for better routing using google’s own backbone. The shell command specified above will reserve a Premium IP address. To know more about IP addresses and their differences take a look at official documentation on External IP addresses

Make a note of the assigned IP address. You will need this for Database permissions and Stream Manager configuration.