Executing a migration

You begin migrating VMs with a command that generates target container artifacts and extracts them using the processing cluster you created in Installing Migrate for Anthos and GKE.

This topic describes how to execute a migration to generate a migration zip file with the extracted application files, settings, and Dockerfile.

Once this step has completed, you'll be able to:

  • Use the migration artifacts in the zip file to build a container image.
  • Deploy the image to your GKE cluster.

Before you begin

To succeed, you should have first done the following:

Executing the migration and generating artifacts

Use the migctl migration generate-artifacts command or the GCP Console to generate the target container artifacts as part of processing a VM for migration.

migctl

migctl migration generate-artifacts my-migration

CRD

  1. Create a WindowsGenerateArtifactsTask my-generate.yaml file to define a migration.

    In this file, set the value of the name field for migration to the name you specified in the Migration yaml when you created the migration:

    apiVersion: anthos-migrate.cloud.google.com/v1beta2
kind: WindowsGenerateArtifactsTask
metadata:
 name: my-migration-task
 namespace: v2k-system
spec:
 migration:
   name:  my-migration

  2. Apply the file:

    kubectl apply -f my-generate.yaml

Console

  1. Open the Migrate for Anthos and GKE page in the Cloud console.

    Go to the Migrate to containers page

  2. Click the Migrations tab to display a table containing the available migrations.

  3. In the row for the desired migration, select Generate artifacts in the Next steps dropdown.

  4. View the status of a migration by:

    • Viewing the Status column for the row for your migration.

    • Clicking the migration Name. The migration Details tab opens. Click the Monitoring tab to see the status details, or the Events tab to see migration events.

When you generate artifacts for Windows workloads, Migrate for Anthos and GKE writes the artifacts to a zip file and then uploads the zip file to a Cloud Storage bucket. This zip file contains:

  • Dockerfile -- The Dockerfile used to build the image for your migrated VM.

  • deployment_spec.yaml -- The YAML file that configures your workload.

    You can use kubectl apply with this file to deploy the workload to a cluster, such as a production or test cluster.

  • Several directories and files that are extracted from the source and used by the Dockerfile.

To check the migration progress:

migctl

migctl migration status my-migration

NAME            CURRENT-OPERATION       PROGRESS        STEP            STATUS  AGE
my-migration    GenerateArtifacts       [1/1]           ExtractImage    Running 12m2s

When the migration completes, you should see a message such as the following when you request status with migctl migration status.

migctl migration status my-migration

NAME            CURRENT-OPERATION       PROGRESS        STEP            STATUS    AGE
my-migration    GenerateArtifacts       [1/1]           ExtractImage    Completed 14m23s

You can also add the -v flag to get error and warning information. See Monitoring a migration for more.

CRD

Use kubectl to get execution information and status by specifying a JSONPath to the necessary field.

  1. Get the migration operation:

    kubectl get migrations.anthos-migrate.cloud.google.com -n v2k-system  my-migration -o jsonpath={.status.currentOperation}

    Returns GenerateArtifacts.

  2. Get the migration status:

    kubectl get migrations.anthos-migrate.cloud.google.com -n v2k-system my-migration -o jsonpath={.status.status}

    When the status shows that the operation has completed, you can move on to the next step.

Console

  1. Open the Migrate for Anthos and GKE page in the Cloud console.

    Go to the Migrate to containers page

  2. Click the Migrations tab to display a table containing the available migrations.

  3. View the status of a migration by:

    • Clicking the migration name. The Migration details panel opens to display the migration status and other information.

    • Viewing the Status column for the row for your migration.

  4. When the Status of the migration is Artifacts generated you can move on to the next step.

Next Steps