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Autohealing Compute Engine Workloads with Managed Instance Groups
What happens when a node fails in your Managed Instance Group (MIG)—does your configuration recover automatically, or do you get a 2 a.m. page? In this lab, you’ll build and run a resilient autohealing compute workload using Managed Instance Groups. You’ll learn how to plan recovery for common infrastructure issues. You’ll configure managed instance groups to heal themselves, then test the behavior by simulating a VM failure. Next, you’ll install the Ops Agent to collect detailed VM logs and metrics. You’ll set up Cloud Monitoring alerts so you receive notifications when usage crosses a threshold. You’ll also create MIG health checks that detect application failures and prompt the MIG to automatically replace unhealthy instances. By the end, you’ll be able to explain and apply practical resiliency and monitoring patterns that help keep services running and available.
Lab Info
Table of Contents
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Challenge
Create an Instance Template and Managed Instance Group, based on an existing VM
- Verify the initial VM configuration startup completed successfully.
- Verify the Ops-Agent configuration is now on all VMs.
- Shutdown the VM and create an image that will be used by your Instance Template.
- Use the Instance Template you created in the previous step to create the Managed Instance Group.
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Challenge
Test application configuration validation
- List the VM's that are part of your MIG.
- SSH to the first VM in the MIG.
- Verify the Cloud Ops agent status.
- Verify the python test application status.
- Verify the health check status is good.
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Challenge
Setup your health monitoring alert and log monitoring
- Create your log based metric.
- Create your email notification channel.
- Create your alert policy.
- Apply the alert policy.
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Challenge
Run the failure simulation and validate the solution
- Verify the VMs listed in the MIG.
- Trigger the failure from the Cloud Shell.
- Confirm your VM has become unhealty.
- Verify your MIG has replaces your VM and returns to a healthy status.
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