# Installation and setup

Constellation runs entirely in your cloud environment and can be controlled via a dedicated [command-line interface (CLI)](../reference/cli.md) or a [Terraform provider](../workflows/terraform-provider.md).

## Prerequisites

Make sure the following requirements are met:

* Your machine is running Linux, macOS, or Windows
* You have admin rights on your machine
* [kubectl](https://kubernetes.io/docs/tasks/tools/) is installed
* Your CSP is Amazon Web Services (AWS), Microsoft Azure, Google Cloud Platform (GCP), or STACKIT

## Install the Constellation CLI

:::tip

If you prefer to use Terraform, you can alternatively use the [Terraform provider](../workflows/terraform-provider.md) to manage the cluster's lifecycle.

:::

The CLI executable is available at [GitHub](https://github.com/edgelesssys/constellation/releases).
Install it with the following commands:

<tabs>
<tabItem value="linux-amd64" label="Linux (amd64)">

1. Download the CLI:

```bash
curl -LO https://github.com/edgelesssys/constellation/releases/latest/download/constellation-linux-amd64
```

2. [Verify the signature](../workflows/verify-cli.md) (optional)

3. Install the CLI to your PATH:

```bash
sudo install constellation-linux-amd64 /usr/local/bin/constellation
```

</tabItem>
<tabItem value="linux-arm64" label="Linux (arm64)">

1. Download the CLI:

```bash
curl -LO https://github.com/edgelesssys/constellation/releases/latest/download/constellation-linux-arm64
```

2. [Verify the signature](../workflows/verify-cli.md) (optional)

3. Install the CLI to your PATH:

```bash
sudo install constellation-linux-arm64 /usr/local/bin/constellation
```

</tabItem>

<tabItem value="darwin-arm64" label="macOS (Apple Silicon)">

1. Download the CLI:

```bash
curl -LO https://github.com/edgelesssys/constellation/releases/latest/download/constellation-darwin-arm64
```

2. [Verify the signature](../workflows/verify-cli.md) (optional)

3. Install the CLI to your PATH:

```bash
sudo install constellation-darwin-arm64 /usr/local/bin/constellation
```

</tabItem>

<tabItem value="darwin-amd64" label="macOS (Intel)">

1. Download the CLI:

```bash
curl -LO https://github.com/edgelesssys/constellation/releases/latest/download/constellation-darwin-amd64
```

2. [Verify the signature](../workflows/verify-cli.md) (optional)

3. Install the CLI to your PATH:

```bash
sudo install constellation-darwin-amd64 /usr/local/bin/constellation
```

</tabItem>

<tabItem value="windows-amd64" label="Windows (amd64)">

1. Download the CLI:

```bash
Invoke-WebRequest -OutFile ./constellation.exe -Uri 'https://github.com/edgelesssys/constellation/releases/latest/download/constellation-windows-amd64.exe'
```

2. [Verify the signature](../workflows/verify-cli.md) (optional)

3. Install the CLI under `C:\Program Files\Constellation\bin\constellation.exe`

3. Add the CLI to your PATH:

    1. Open `Advanced system settings` by searching for the App in the Windows search
    2. Go to the `Advanced` tab
    3. Click `Environment Variables…`
    4. Click variable called `Path` and click `Edit…`
    5. Click `New`
    6. Enter the path to the folder containing the binary you want on your PATH: `C:\Program Files\Constellation\bin`

</tabItem>
</tabs>

:::tip
The CLI supports autocompletion for various shells. To set it up, run `constellation completion` and follow the given steps.
:::

## Set up cloud credentials

Constellation makes authenticated calls to the CSP API. Therefore, you need to set up Constellation with the credentials for your CSP.

:::tip
If you don't have a cloud subscription, you can also set up a [local Constellation cluster using virtualization](../getting-started/first-steps-local.md) for testing.
:::

### Required permissions

<tabs groupId="csp">
<tabItem value="aws" label="AWS">

To set up a Constellation cluster, you need to perform two tasks that require permissions: create the infrastructure and create roles for cluster nodes. Both of these actions can be performed by different users, e.g., an administrator to create roles and a DevOps engineer to create the infrastructure.

To [create the IAM configuration](../workflows/config.md#creating-an-iam-configuration) for Constellation, you need the following permissions:

```json
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "ec2:DescribeAccountAttributes",
                "iam:AddRoleToInstanceProfile",
                "iam:AttachRolePolicy",
                "iam:CreateInstanceProfile",
                "iam:CreatePolicy",
                "iam:CreateRole",
                "iam:DeleteInstanceProfile",
                "iam:DeletePolicy",
                "iam:DeletePolicyVersion",
                "iam:DeleteRole",
                "iam:DetachRolePolicy",
                "iam:GetInstanceProfile",
                "iam:GetPolicy",
                "iam:GetPolicyVersion",
                "iam:GetRole",
                "iam:ListAttachedRolePolicies",
                "iam:ListInstanceProfilesForRole",
                "iam:ListPolicyVersions",
                "iam:ListRolePolicies",
                "iam:PassRole",
                "iam:RemoveRoleFromInstanceProfile",
                "sts:GetCallerIdentity"
            ],
            "Resource": "*"
        }
    ]
}
```

The built-in `AdministratorAccess` policy is a superset of these permissions.

To [create a Constellation cluster](../workflows/create.md), see the permissions of [main.tf](https://github.com/edgelesssys/constellation/blob/main/terraform/infrastructure/iam/aws/main.tf).

The built-in `PowerUserAccess` policy is a superset of these permissions.

Follow Amazon's guide on [understanding](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies.html) and [managing policies](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_managed-vs-inline.html).

</tabItem>
<tabItem value="azure" label="Azure">

The following [resource providers need to be registered](https://learn.microsoft.com/en-us/azure/azure-resource-manager/management/resource-providers-and-types#register-resource-provider) in your subscription:

* `Microsoft.Attestation`
* `Microsoft.Compute`
* `Microsoft.Insights`
* `Microsoft.ManagedIdentity`
* `Microsoft.Network`

By default, Constellation tries to register these automatically if they haven't been registered before.

To [create the IAM configuration](../workflows/config.md#creating-an-iam-configuration) for Constellation, you need the following permissions:

* `*/register/action` \[1]
* `Microsoft.Authorization/roleAssignments/*`
* `Microsoft.Authorization/roleDefinitions/*`
* `Microsoft.ManagedIdentity/userAssignedIdentities/*`
* `Microsoft.Resources/subscriptions/resourcegroups/*`

The built-in `Owner` role is a superset of these permissions.

To [create a Constellation cluster](../workflows/create.md), you need the following permissions:

* `Microsoft.Attestation/attestationProviders/*`
* `Microsoft.Compute/virtualMachineScaleSets/*`
* `Microsoft.Insights/components/*`
* `Microsoft.ManagedIdentity/userAssignedIdentities/*`
* `Microsoft.Network/loadBalancers/*`
* `Microsoft.Network/loadBalancers/backendAddressPools/*`
* `Microsoft.Network/networkSecurityGroups/*`
* `Microsoft.Network/publicIPAddresses/*`
* `Microsoft.Network/virtualNetworks/*`
* `Microsoft.Network/virtualNetworks/subnets/*`
* `Microsoft.Network/natGateways/*`

The built-in `Contributor` role is a superset of these permissions.

Follow Microsoft's guide on [understanding](https://learn.microsoft.com/en-us/azure/role-based-access-control/role-definitions) and [assigning roles](https://learn.microsoft.com/en-us/azure/role-based-access-control/role-assignments).

1: You can omit `*/register/Action` if the resource providers mentioned above are already registered and the `ARM_SKIP_PROVIDER_REGISTRATION` environment variable is set to `true` when creating the IAM configuration.

</tabItem>
<tabItem value="gcp" label="GCP">

Create a new project for Constellation or use an existing one.
Enable the [Compute Engine API](https://console.cloud.google.com/apis/library/compute.googleapis.com) on it.

To [create the IAM configuration](../workflows/config.md#creating-an-iam-configuration) for Constellation, you need the following permissions:

* `iam.serviceAccountKeys.create`
* `iam.serviceAccountKeys.delete`
* `iam.serviceAccountKeys.get`
* `iam.serviceAccounts.create`
* `iam.serviceAccounts.delete`
* `iam.serviceAccounts.get`
* `resourcemanager.projects.getIamPolicy`
* `resourcemanager.projects.setIamPolicy`

Together, the built-in roles `roles/editor` and `roles/resourcemanager.projectIamAdmin` form a superset of these permissions.

To [create a Constellation cluster](../workflows/create.md), you need the following permissions:

* `compute.addresses.createInternal`
* `compute.addresses.deleteInternal`
* `compute.addresses.get`
* `compute.addresses.useInternal`
* `compute.backendServices.create`
* `compute.backendServices.delete`
* `compute.backendServices.get`
* `compute.backendServices.use`
* `compute.disks.create`
* `compute.firewalls.create`
* `compute.firewalls.delete`
* `compute.firewalls.get`
* `compute.firewalls.update`
* `compute.globalAddresses.create`
* `compute.globalAddresses.delete`
* `compute.globalAddresses.get`
* `compute.globalAddresses.use`
* `compute.globalForwardingRules.create`
* `compute.globalForwardingRules.delete`
* `compute.globalForwardingRules.get`
* `compute.globalForwardingRules.setLabels`
* `compute.globalOperations.get`
* `compute.healthChecks.create`
* `compute.healthChecks.delete`
* `compute.healthChecks.get`
* `compute.healthChecks.useReadOnly`
* `compute.instanceGroupManagers.create`
* `compute.instanceGroupManagers.delete`
* `compute.instanceGroupManagers.get`
* `compute.instanceGroupManagers.update`
* `compute.instanceGroups.create`
* `compute.instanceGroups.delete`
* `compute.instanceGroups.get`
* `compute.instanceGroups.update`
* `compute.instanceGroups.use`
* `compute.instances.create`
* `compute.instances.setLabels`
* `compute.instances.setMetadata`
* `compute.instances.setTags`
* `compute.instanceTemplates.create`
* `compute.instanceTemplates.delete`
* `compute.instanceTemplates.get`
* `compute.instanceTemplates.useReadOnly`
* `compute.networks.create`
* `compute.networks.delete`
* `compute.networks.get`
* `compute.networks.updatePolicy`
* `compute.routers.create`
* `compute.routers.delete`
* `compute.routers.get`
* `compute.routers.update`
* `compute.subnetworks.create`
* `compute.subnetworks.delete`
* `compute.subnetworks.get`
* `compute.subnetworks.use`
* `compute.targetTcpProxies.create`
* `compute.targetTcpProxies.delete`
* `compute.targetTcpProxies.get`
* `compute.targetTcpProxies.use`
* `iam.serviceAccounts.actAs`

Together, the built-in roles `roles/editor`, `roles/compute.instanceAdmin` and `roles/resourcemanager.projectIamAdmin` form a superset of these permissions.

Follow Google's guide on [understanding](https://cloud.google.com/iam/docs/understanding-roles) and [assigning roles](https://cloud.google.com/iam/docs/granting-changing-revoking-access).

</tabItem>
<tabItem value="stackit" label="STACKIT">

Constellation on STACKIT requires a User Access Token (UAT) for the OpenStack API and a STACKIT service account.
The UAT already has all required permissions by default.
The STACKIT service account needs the `editor` role to create STACKIT LoadBalancers.
Look at the [STACKIT documentation](https://docs.stackit.cloud/stackit/en/getting-started-in-service-accounts-134415831.html) on how to create the service account and assign the role.

</tabItem>
</tabs>

### Authentication

You need to authenticate with your CSP. The following lists the required steps for *testing* and *production* environments.

:::note
The steps for a *testing* environment are simpler. However, they may expose secrets to the CSP. If in doubt, follow the *production* steps.
:::

<tabs groupId="csp">
<tabItem value="aws" label="AWS">

**Testing**

You can use the [AWS CloudShell](https://console.aws.amazon.com/cloudshell/home). Make sure you are [authorized to use it](https://docs.aws.amazon.com/cloudshell/latest/userguide/sec-auth-with-identities.html).

**Production**

Use the latest version of the [AWS CLI](https://aws.amazon.com/cli/) on a trusted machine:

```bash
aws configure
```

Options and first steps are described in the [AWS CLI documentation](https://docs.aws.amazon.com/cli/index.html).

</tabItem>
<tabItem value="azure" label="Azure">

**Testing**

Simply open the [Azure Cloud Shell](https://docs.microsoft.com/en-us/azure/cloud-shell/overview).

**Production**

Use the latest version of the [Azure CLI](https://docs.microsoft.com/en-us/cli/azure/) on a trusted machine:

```bash
az login
```

Other options are described in Azure's [authentication guide](https://docs.microsoft.com/en-us/cli/azure/authenticate-azure-cli).

</tabItem>
<tabItem value="gcp" label="GCP">

**Testing**

You can use the [Google Cloud Shell](https://cloud.google.com/shell). Make sure your [session is authorized](https://cloud.google.com/shell/docs/auth). For example, execute `gsutil` and accept the authorization prompt.

**Production**

Use one of the following options on a trusted machine:

* Use the [`gcloud` CLI](https://cloud.google.com/sdk/gcloud)

    ```bash
    gcloud auth application-default login
    ```

    This will ask you to log-in to your Google account and create your credentials.
    The Constellation CLI will automatically load these credentials when needed.

* Set up a service account and pass the credentials manually

    Follow [Google's guide](https://cloud.google.com/docs/authentication/production#manually) for setting up your credentials.

</tabItem>
<tabItem value="stackit" label="STACKIT">

You need to authenticate with the infrastructure API (OpenStack) and create a service account (STACKIT API).

1. [Follow the STACKIT documentation](https://docs.stackit.cloud/stackit/en/step-1-generating-of-user-access-token-11763726.html) for obtaining a User Access Token (UAT) to use the infrastructure API
2. Create a configuration file under `~/.config/openstack/clouds.yaml` (`%AppData%\openstack\clouds.yaml` on Windows) with the credentials from the User Access Token

    ```yaml
    clouds:
        stackit:
            auth:
                auth_url: https://keystone.api.iaas.eu01.stackit.cloud/v3
                username: REPLACE_WITH_UAT_USERNAME
                password: REPLACE_WITH_UAT_PASSWORD
                project_id: REPLACE_WITH_STACKIT_PROJECT_ID
                project_name: REPLACE_WITH_STACKIT_PROJECT_NAME
                user_domain_name: portal_mvp
                project_domain_name: portal_mvp
            region_name: RegionOne
            identity_api_version: 3
    ```

3. [Follow the STACKIT documentation](https://docs.stackit.cloud/stackit/en/getting-started-in-service-accounts-134415831.html) for creating a service account and an access token
4. Assign the `editor` role to the service account by [following the documentation](https://docs.stackit.cloud/stackit/en/getting-started-in-service-accounts-134415831.html)
5. Create a configuration file under `~/.stackit/credentials.json` (`%USERPROFILE%\.stackit\credentials.json` on Windows)

    ```json
    {"STACKIT_SERVICE_ACCOUNT_TOKEN":"REPLACE_WITH_TOKEN"}
    ```

</tabItem>

</tabs>

## Next steps

You are now ready to [deploy your first confidential Kubernetes cluster and application](first-steps.md).