> ## Documentation Index > Fetch the complete documentation index at: https://cloudanix.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Instances multi az remediation ### Triage and Remediation ### Remediation In GCP, the equivalent of Multi AZ in AWS is the "Regional Managed Instance Group". To remediate the misconfiguration of instances not being Multi AZ in GCP, you can follow these steps: 1. Open the GCP console and go to the Compute Engine section. 2. Click on "Instance groups" in the left-hand menu. 3. Click on the name of the instance group that you want to make Multi AZ. 4. Click on the "Edit" button at the top of the page. 5. In the "Autohealing" section, select "On" for "Enable autohealing". 6. In the "Location" section, select the region where you want the instance group to be Multi AZ. 7. In the "Size" section, set the "Number of instances" to the desired number of instances for the Multi AZ group. 8. Click on the "Save" button at the bottom of the page. Once you have completed these steps, your instance group will be Multi AZ and will automatically heal and distribute instances across multiple zones within the selected region. # In GCP, the concept of Multi-AZ is called "High Availability" and can be achieved by using Managed Instance Groups. To remediate the misconfiguration, you can follow these steps: 1. Open the Cloud Shell from the GCP Console. 2. Create a Managed Instance Group using the following command: ``` gcloud compute instance-groups managed create [GROUP_NAME] \ --size [GROUP_SIZE] \ --template [INSTANCE_TEMPLATE] \ --base-instance-name [INSTANCE_NAME] \ --zone [ZONE] \ --health-check [HEALTH_CHECK] ``` Replace the placeholders in the command with the following values: * \[GROUP\_NAME]: Name of the Managed Instance Group you want to create * \[GROUP\_SIZE]: Number of instances you want to create in the group * \[INSTANCE\_TEMPLATE]: Name of the instance template you want to use to create instances in the group * \[INSTANCE\_NAME]: Base name of the instances in the group * \[ZONE]: Zone in which you want to create the instances * \[HEALTH\_CHECK]: Name of the health check that will be used to verify the health of the instances 3. Once the Managed Instance Group is created, you can configure it to use the Multi-AZ feature by setting the `autohealingPolicies` property. Use the following command to set the property: ``` gcloud compute instance-groups managed update [GROUP_NAME] \ --update-autoscaling-policy \ --autohealing-policies health-check=[HEALTH_CHECK],initial-delay-sec=120 ``` Replace the \[GROUP\_NAME] and \[HEALTH\_CHECK] placeholders with the actual values. 4. Verify that the Managed Instance Group has been configured for High Availability by checking the Instance Group details in the GCP Console. By following these steps, you can remediate the misconfiguration of instances not being Multi-AZ in GCP using GCP CLI. In GCP, the equivalent of Multi-AZ is called "Regionalization". To remediate the misconfiguration of instances not being multi-AZ, you can use the following steps: 1. Identify the instances that are not regionalized. You can use the following Python code to get a list of all the instances that are not regionalized: ``` from google.cloud import compute_v1 compute_client = compute_v1.InstancesClient() project_id = '[PROJECT_ID]' zone = '[ZONE]' instances = compute_client.list(project=project_id, zone=zone).items for instance in instances: if not instance.region: print(f"Instance {instance.name} is not regionalized.") ``` Replace `[PROJECT_ID]` and `[ZONE]` with your GCP project ID and the zone in which your instances are running. 2. For each instance that is not regionalized, create a new instance in a regionalized zone and migrate the data. ``` from google.cloud import compute_v1 compute_client = compute_v1.InstancesClient() project_id = '[PROJECT_ID]' zone = '[ZONE]' region = '[REGION]' instances = compute_client.list(project=project_id, zone=zone).items for instance in instances: if not instance.region: new_instance_name = f"{instance.name}-regionalized" new_instance_body = { "name": new_instance_name, "machine_type": f"zones/{region}/machineTypes/{instance.machine_type.split('/')[-1]}", "network_interfaces": instance.network_interfaces, "disks": instance.disks, "metadata": instance.metadata, "service_accounts": instance.service_accounts, "tags": instance.tags, "labels": instance.labels, "scheduling": instance.scheduling, "shielded_instance_config": instance.shielded_instance_config, "reservation_affinity": instance.reservation_affinity, "guest_accelerators": instance.guest_accelerators, "deletion_protection": instance.deletion_protection } operation = compute_client.insert(project=project_id, zone=region, body=new_instance_body) operation.wait() # Migrate data from the old instance to the new instance # Delete the old instance operation = compute_client.delete(project=project_id, zone=zone, instance=instance.name) operation.wait() print(f"Instance {instance.name} has been regionalized to {new_instance_name}.") ``` Replace `[PROJECT_ID]`, `[ZONE]` and `[REGION]` with your GCP project ID, the zone in which your instances are running, and the region to which you want to regionalize your instances. Note that this code will create a new instance in the specified region, migrate the data from the old instance to the new instance, and then delete the old instance. You should test this code thoroughly in a non-production environment before running it in production. ```hcl theme={null} # Replace single-zone instances with a Regional Managed Instance Group. # NOTE: This remediation REPLACES the existing google_compute_instance; # traffic-cutover and data migration must be planned before apply. resource "google_compute_instance_template" "REGIONAL_APP_TEMPLATE" { name_prefix = "REGIONAL_APP_TEMPLATE_PREFIX-" # e.g. "myapp-" machine_type = "MACHINE_TYPE" # e.g. "e2-standard-4" region = "REGION" # e.g. "us-central1" disk { source_image = "SOURCE_IMAGE" # e.g. "projects/debian-cloud/global/images/family/debian-12" auto_delete = true boot = true } network_interface { network = "VPC_NETWORK_SELF_LINK_OR_NAME" # e.g. "default" or full self_link subnetwork = "SUBNETWORK_SELF_LINK_OR_NAME" # regional subnet # access_config {} # Uncomment if you need an external IP } service_account { email = "SERVICE_ACCOUNT_EMAIL" # e.g. "my-sa@PROJECT_ID.iam.gserviceaccount.com" scopes = ["https://www.googleapis.com/auth/cloud-platform"] } metadata = { startup-script = "STARTUP_SCRIPT_CONTENT_OR_TEMPLATE" } tags = [ "NETWORK_TAG_1", "NETWORK_TAG_2", ] } resource "google_compute_region_instance_group_manager" "REGIONAL_APP_MIG" { name = "REGIONAL_MIG_NAME" # e.g. "myapp-regional-mig" region = "REGION" # same as template, e.g. "us-central1" base_instance_name = "BASE_INSTANCE_NAME" # e.g. "myapp" version { instance_template = google_compute_instance_template.REGIONAL_APP_TEMPLATE.self_link name = "primary" } target_size = 3 # desired number of instances distribution_policy_zones = [ "ZONE_1", # e.g. "us-central1-a" "ZONE_2", # e.g. "us-central1-b" "ZONE_3", # e.g. "us-central1-c" ] auto_healing_policies { health_check = "HEALTH_CHECK_SELF_LINK" # optional but recommended initial_delay_sec = 300 } } # OPTIONAL: Remove or comment out any existing single-zone google_compute_instance # "SINGLE_ZONE_INSTANCE" once the MIG is serving traffic, e.g.: # # resource "google_compute_instance" "SINGLE_ZONE_INSTANCE" { # # REMOVE to eliminate the single-zone SPOF # } ``` This change moves from single-zone `google_compute_instance` to a regional managed instance group, which is a replacement and can cause downtime if not cut over carefully. For verification, `terraform plan` should show: * Creation of `google_compute_instance_template.REGIONAL_APP_TEMPLATE` * Creation of `google_compute_region_instance_group_manager.REGIONAL_APP_MIG` * (Once you remove the old instance block) destruction of the original single-zone `google_compute_instance` so that no standalone instance remains as a single point of failure.