# Source: https://docs.vespa.ai/en/learn/migrating-to-cloud.html.md

# Migrating to Vespa Cloud

 

Migrating a Vespa application to Vespa Cloud is straightforward, as applications on Vespa Cloud supports all the same features as your self-hosted Vespa instances, you're just gaining some new capabilities and avoid the operational work.

The high-level process is as follows:

1. Functional validation using the [dev](../operations/environments.html#dev) environment (this guide).
2. Deployment to a [prod](../operations/environments.html#prod) zone.

The rest of this guide assumes you have a [tenant](tenant-apps-instances.html) ready for deployment:

```
$ export VESPA_TENANT_NAME=mytenant
```

**Prerequisites:**

- Linux, macOS or Windows 10 Pro on x86\_64 or arm64, with [Podman Desktop](https://podman.io/) or [Docker Desktop](https://www.docker.com/products/docker-desktop/) installed, with an engine running. 
  - Alternatively, start the Podman daemon:
```
$ podman machine init --memory 6000
$ podman machine start
```
  - See [Docker Containers](/en/operations/self-managed/docker-containers.html) for system limits and other settings.

- For CPUs older than Haswell (2013), see [CPU Support](/en/cpu-support.html).
- Memory: Minimum RAM dedicated to Docker/Podman. [Memory recommendations](/en/operations/self-managed/node-setup.html#memory-settings). 
- Disk: Avoid `NO_SPACE` - the vespaengine/vespa container image + headroom for data requires disk space. [Read more](/en/writing/feed-block.html). 
- [Homebrew](https://brew.sh/) to install the [Vespa CLI](/en/clients/vespa-cli.html), or download the Vespa CLI from [Github releases](https://github.com/vespa-engine/vespa/releases). 

 **Note:**[Vespa Cloud Enclave](../operations/enclave/enclave.html) users: Run the enclave setup steps first.

### 1. Verify source application package

An [application package](../basics/applications.html) from a self-hosted system can be deployed with minor modifications to the Vespa Cloud `dev` environment.

The root of an application package might look at this:

```
├── schemas
│ └── doc.sd
└── services.xml
```

There are often more files, the above is a minimum. This is the root of the application package - make this the current working directory:

```
$ cd /location/of/app/package
```

### 2. Validate the Vespa CLI

Make sure the Vespa CLI is installed, see pre-requisites above:

```
$ vespa
Usage:
  vespa [flags]
  vespa [command]
```

### 3. Vespa Cloud login

Configure the local environment and log in to Vespa Cloud:

```
$ vespa config set target cloud && \
  vespa config set application $VESPA_TENANT_NAME.myapp && \
  vespa auth login
```

### 4. Add Credentials to the Application package

Create and get security credentials:

```
$ vespa auth cert
```

This will add the `security` directory to the application package, and add a public certificate to it:

```
├── schemas
│ └── doc.sd
├── security
│ └── clients.pem
└── services.xml
```

The command also installs a key/certificate pair in the Vespa CLI home directory, see[vespa auth cert](../reference/clients/vespa-cli/vespa_auth_cert.html). This pair is used in subsequent accesses to the data plane for document and query operations.

### 5. Vespa Cloud Enclave Only: Add Account

 **Note:** Skip this step unless you are using [Vespa Cloud Enclave](../operations/enclave/enclave.html).

Add [deployment.xml](../reference/applications/deployment.html#deployment) with your cloud provider account - This ensures the deployment uses resources from the correct account - examples:

```
<deployment version="1.0" cloud-account="gcp:project-name">
   <dev />
</deployment>
```

```
<deployment version="1.0" cloud-account="aws:123456789012">
    <dev />
</deployment>
```

The application package should look like:

```
├── deployment.xml
├── schemas
│ └── doc.sd
├── security
│ └── clients.pem
└── services.xml
```

### 6. Remove hosts.xml

`hosts.xml` is not used in Vespa Cloud, remove it.

### 7. Modify services.xml

Edit the `<nodes>` configuration in `services.xml` - from:

```
<container id="default" version="1.0">
    <document-api/>
    <document-processing/>
    <search/>
    <nodes>
        <node hostalias="node4" />
        <node hostalias="node5" />
    </nodes>
</container>
```

to:

```
<container id="default" version="1.0">
    <document-api/>
    <document-processing/>
    <search/>
    <nodes count="2">
         <resources vcpu="2" memory="8Gb" disk="50Gb"/>
    </nodes>
</container>
```

In short, this is the Vespa Cloud syntax for resource specifications.

Example, migrating from a cluster using `c7i.2xlarge` instance type, with a 200G disk - from the AWS specifications:

```
c7i.2xlarge 8 16 EBS-Only
```

Equivalent Vespa Cloud configuration:

```
<resources vcpu="8" memory="16Gb" disk="200Gb"/>
```

Repeat this for all clusters in `services.xml`. Notes:

1. As you are now migrating to the `dev` environment, what is _actually_ deployed is a minimized version. The configuration changes above are easily tested in this environment.
2. Using `count=2` is best practise at this point.
3. Resources must match a node instance type at the cloud providers(s) deploying to, see[AWS flavors](https://cloud.vespa.ai/en/reference/aws-flavors.html),[GCP flavors](https://cloud.vespa.ai/en/reference/gcp-flavors.html), and [Azure flavors](https://cloud.vespa.ai/en/reference/azure-flavors.html).

### 8. Deploy to Vespa Cloud Dev Environment

At this point, the local environment and the application package is ready for deployment:

```
$ vespa deploy --wait 600
```

Please note that a first-time deployment normally takes a few minutes, as resources are provisioned.

At this point, we recommend opening the console to observe the deployed application. The link will be `https://console.vespa-cloud.com/tenant/mytenant/application/myapp/dev/instance/default`(replace with your own names) - this is also easily found in the console main page:

![dev view](/assets/img/free-trial.png)

Refer to [vespa8 release notes](../reference/release-notes/vespa8.html) for troubleshooting in case the deployments fails, based on a Vespa 7 (or earlier) version.

### 9. Use the Endpoints

The endpoints are shown in the console, one can also list them like:

```
$ vespa status query
Container default at https://aa1c1234.b225678e.z.vespa-app.cloud/ is ready
```

Test the query endpoint, expect `totalCount: 0`:

```
$ vespa query 'select * from sources * where true'
```

```
{
    "root": {
        "id": "toplevel",
        "relevance": 1.0,
        "fields": {
            "totalCount": 0
        },
```

In the `services.xml` examples at the start of this guide, both `<search>` and `<document>` and configured in the same cluster, named `default`. In case of multiple container clusters, select the one configured with `<search>`:

```
vespa query 'select * from sources * where true' --cluster myquerycluster
```

Finally, feed a document to the cluster (this is the cluster configured with `<document>`)

```
vespa feed mydoc.jsonl --cluster myfeedcluster
```

Redo the query and observe nonzero `totalCount`.

## Next steps

This is the final step in the functional validation. Please note:

 **Note:** Deployments to `dev` expire after 7 days of inactivity, i.e., 7 days after the last deployment.**This applies to all plans**. Use the Vespa Console to extend the expiry period, or redeploy the application to add 7 more days.

- Read more about the [dev](../operations/environments.html#dev) environment
- Feed (a subset) of the data and validate that queries and other API accesses work as expected.
- At the end of the validation process, continue to [production deployment](../operations/production-deployment.html) to set up in production zones.

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### On this page:

- [1. Verify source application package](#1-verify-source-application-package)
- [2. Validate the Vespa CLI](#2-validate-the-vespa-cli)
- [3. Vespa Cloud login](#3-vespa-cloud-login)
- [4. Add Credentials to the Application package](#4-add-credentials-to-the-application-package)
- [5. Vespa Cloud Enclave Only: Add Account](#5-vespa-cloud-enclave-only-add-account)
- [6. Remove hosts.xml](#6-remove-hostsxml)
- [7. Modify services.xml](#7-modify-servicesxml)
- [8. Deploy to Vespa Cloud Dev Environment](#8-deploy-to-vespa-cloud-dev-environment)
- [9. Use the Endpoints](#9-use-the-endpoints)
- [Next steps](#next-steps)