Migrate a Linux VM using Migrate to Containers CLI

In this quickstart, you create a Compute Engine virtual machine (VM) instance, then use the Migrate to Containers CLI to migrate the VM to Google Kubernetes Engine (GKE).

Before you begin

In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

Note: If you don't plan to keep the resources that you create in this procedure, create a project instead of selecting an existing project. After you finish these steps, you can delete the project, removing all resources associated with the project.

Go to project selector
Make sure that billing is enabled for your Google Cloud project. Learn how to check if billing is enabled on a project.
Enable the Compute Engine API.

Enable Compute Engine API
Enable the GKE API.
Enable GKE API

Create a Compute Engine VM with a web server to use as source VM

This section describes how to create a Compute Engine VM that serves a Hello World! web page that you can use for testing after migration is complete.

In the Google Cloud console, click Activate Cloud Shell.
Go to Google Cloud console

Create a VM:

gcloud compute instances create quickstart-source-vm \
  --zone=us-central1-a --machine-type=e2-medium  \
  --subnet=default --scopes="cloud-platform" \
  --tags=http-server,https-server --image=ubuntu-2204-jammy-v20240208 \
  --image-project=ubuntu-os-cloud --boot-disk-size=10GB --boot-disk-type=pd-standard \
  --boot-disk-device-name=quickstart-source-vm

Allow a few minutes for the VM creation to complete.

Create a firewall rule that allows requests to the instance over HTTP:

gcloud compute firewall-rules create default-allow-http \
  --direction=INGRESS --priority=1000 --network=default --action=ALLOW \
  --rules=tcp:80 --source-ranges=0.0.0.0/0 --target-tags=http-server

Go to the VM instances page.

Go to VM instances
To connect to the VM quickstart-source-vm, locate the row for the VM, then click SSH.

The connection is established in a new tab.
On the quickstart-source-vm command tab, install the apache2 package:
```
sudo apt-get update && sudo apt-get install apache2 -y
```
After installing Apache, the operating system automatically starts the Apache server.

On the same tab, overwrite the Apache web server default web page with a new page:

echo '<!doctype html><html><body><h1>Hello World!</h1></body></html>' | sudo tee /var/www/html/index.html

Go back to the VM instances page, and copy the External IP address displayed for quickstart-source-vm.
Paste the IP address of the VM in your browser address bar. Prefix it with http://.

The Hello World! page appears.

Create a Compute Engine VM to use as a local machine

In this section, you create a Linux VM that you can use as your local machine to perform the different Migrate to Containers operations for migrating the source VM.

In the Google Cloud console, click Activate Cloud Shell.
Go to Google Cloud console

Create a VM:

gcloud compute instances create quickstart-local-vm \
  --zone=us-central1-a --machine-type=e2-medium  \
  --subnet=default --scopes="cloud-platform" \
  --tags=http-server,https-server --image=ubuntu-2204-jammy-v20240208 \
  --image-project=ubuntu-os-cloud --boot-disk-size=50GB --boot-disk-type=pd-standard \
  --boot-disk-device-name=quickstart-local-vm

Allow a few minutes for the VM creation to complete.

Create a GKE cluster

In this section, you create a GKE cluster in Google Cloud, where you deploy your containerized workload later in this quickstart.

In Cloud Shell, create a new Kubernetes cluster:

gcloud container clusters create quickstart-cluster \
  --zone=us-central1-a --machine-type=e2-medium \
  --image-type=ubuntu_containerd --num-nodes=1 \
  --logging=SYSTEM,WORKLOAD,API_SERVER,SCHEDULER,CONTROLLER_MANAGER

Allow a few minutes for the cluster creation to complete.

Prepare the local VM to perform the migration

Go to the VM instances page.

Go to VM instances
To connect to the VM quickstart-local-vm, locate the row for the VM, then click SSH.

The connection is established in a new tab.

On the quickstart-local-vm command tab, install the Google Cloud CLI:

# Import the Google Cloud public key.
curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo gpg --dearmor -o /usr/share/keyrings/cloud.google.gpg

# Add the gcloud CLI distribution URI as a package source
echo "deb [signed-by=/usr/share/keyrings/cloud.google.gpg] https://packages.cloud.google.com/apt cloud-sdk main" | sudo tee -a /etc/apt/sources.list.d/google-cloud-sdk.list

# Update and install gcloud
sudo apt-get update && sudo apt-get install google-cloud-cli

# Get started
gcloud init

To complete the gcloud CLI setup, follow the instructions that appear on the quickstart-local-vm command tab:

To select the account to use to perform various operations, enter 1.
To select the project where you created the VM, enter 1.
To skip configuring a default region and zone, enter n.

Install Docker and allow the non-root user to run containers:

# Download the convenience script
curl -fsSL https://get.docker.com -o install-docker.sh

# Install Docker
sudo sh install-docker.sh

# Allow the non-root user to access Docker
sudo usermod -aG docker $USER

# Activate the group changes
newgrp docker

Install Skaffold:

curl -Lo skaffold https://storage.googleapis.com/skaffold/releases/latest/skaffold-linux-amd64 && \
sudo install skaffold /usr/local/bin/

Download the Migrate to Containers CLI:

curl -O "https://m2c-cli-release.storage.googleapis.com/$(curl -s https://m2c-cli-release.storage.googleapis.com/latest)/linux/amd64/m2c"
chmod +x ./m2c

Migrate the source VM

A migration typically involves three steps: copying the source VM file system, analyzing the file system to create a migration plan, and generating the migration artifacts.

The following sections describe how to use the Migrate to Containers CLI for migrating the source VM using your local Linux VM.

Copy the source VM file system

When you copy a source VM file system, the Migrate to Containers CLI uses default filters to reduce the size of the copied file system. However, to make the Apache server available to start up, the server needs the /var/log directory, which is removed by the default filters.

This section describes how to edit the default filters to ensure that /var/log/* is copied with the source VM file system.

On the quickstart-local-vm command tab, get a list of the default Migrate to Containers filters in a file called filters.txt:
```
./m2c copy default-filters > filters.txt
```
To edit the default filters, do the following:
1. Open the filters.txt file in a text editor:
```
vi filters.txt
```
2. To make changes in the file, press i.
3. Remove the following statement:
```
- /var/log/*
```
4. To save the file and exit the text editor, press Esc and then enter :wq.
Copy the source machine's file system:
```
./m2c copy gcloud \
  --project PROJECT_ID --zone us-central1-a \
  --vm-name quickstart-source-vm --output quickstart-vm-filesystem \
  --filters filters.txt
```
Replace PROJECT_ID with the ID of the project.

A copy of the source machine's file system is available in the quickstart-vm-filesystem directory.

Create the migration plan

On the quickstart-local-vm command tab, create the migration plan:
```
./m2c analyze \
  --source quickstart-vm-filesystem --plugin linux-vm-container \
  --output analysis-output
```
After the analysis is complete, a new directory called analysis-output is created which contains the migration plan, config.yaml.

Generate the migration artifacts

On the quickstart-local-vm command tab, generate the migration artifacts:
```
./m2c generate --input analysis-output --output migration-artifacts
```
The generated migration artifacts are added to the migration-artifacts directory.

Deploy the migrated workload

In this section, you deploy the migrated workload from your local VM quickstart-local-vm to the GKE cluster running on Google Cloud.

On the quickstart-local-vm command tab, install the gke-gcloud-auth-plugin plugin:
```
sudo apt-get install google-cloud-sdk-gke-gcloud-auth-plugin
```
Install kubectl:
```
sudo apt-get install kubectl
```

Connect to the cluster quickstart-cluster:

gcloud container clusters get-credentials quickstart-cluster \
  --zone us-central1-a --project PROJECT_ID

Open the migration-artifacts folder:
```
cd migration-artifacts
```

To expose the workload to the internet, add a new LoadBalancer service in the deployment_spec.yaml file. To edit the deployment_spec.yaml file, do the following:

Open the deployment_spec.yaml file in a text editor:
```
vi deployment_spec.yaml
```
To make changes in the file, press i.

Locate the Service object with the name linux-system. It appears similar to the following:

apiVersion: v1
kind: Service
metadata:
  labels:
    anthos-migrate.cloud.google.com/type: linux-container
    migrate-for-anthos-optimization: "true"
    migrate-for-anthos-version: m2c-cli-1.2.2
  name: linux-system
spec:
  clusterIP: None
  selector:
    app: linux-system
  type: ClusterIP

Add another Service object called hello-service right after linux-system:

apiVersion: v1
kind: Service
metadata:
  labels:
    anthos-migrate.cloud.google.com/type: linux-container
    migrate-for-anthos-optimization: "true"
    migrate-for-anthos-version: m2c-cli-1.2.2
  name: linux-system
spec:
  clusterIP: None
  selector:
    app: linux-system
  type: ClusterIP
---
# Add the hello-service object
apiVersion: v1
kind: Service
metadata:
  name: hello-service
spec:
  selector:
    app: linux-system
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80
  type: LoadBalancer

To save the file and exit the text editor, press Esc and then enter :wq.

Deploy the migrated VM:
```
skaffold run -d eu.gcr.io/PROJECT_ID
```
Get the external IP address of the migrated VM:
```
kubectl get service hello-service
```

When the web server is ready, you see an external IP address for the hello-service you added.

NAME            TYPE           CLUSTER-IP      EXTERNAL-IP    PORT(S)        AGE
hello-service   LoadBalancer   10.23.241.124   EXTERNAL_IP   80:32611/TCP   5m4s

To check if the migration was successful, open a new browser tab and visit the web page at the external IP address.
```
http://EXTERNAL_IP
```
Make sure to use HTTP and not HTTPS.
If you see the text Hello World! displayed on your screen, your VM migration was successful.

If you're not able to access your migrated workload, see how to troubleshoot known issues.

Clean up

To avoid incurring charges to your Google Cloud account for the resources used on this page, follow these steps.

Delete the GKE cluster

In the Google Cloud console, go to the GKE page.
Go to GKE
Select quickstart-cluster, and then click Delete.
When prompted to confirm, click Delete again.

Delete the VMs

In the Google Cloud console, go to the VM instances page.
Go to VM instances
Click the name quickstart-source-vm.
At the top of the instance's details page, click Delete.
Click the name quickstart-local-vm.
At the top of the instance's details page, click Delete.

What's next

Learn how to batch guest discovery and data collection.
To learn how to migrate a more complex application, see the Migrating a Spring framework application tutorial available in the Migrate to Containers GitHub repository.