> ## Documentation Index
> Fetch the complete documentation index at: https://docs.chronosphere.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Installation prerequisites

Review and complete the following prerequisites before installing Chronosphere
Telemetry Pipeline.

## Networking and firewall requirements

If your organization uses outbound firewall rules, you might need to allow the
following URLs.

<Note>
  All of the listed URLs use the TCP protocol and port `443`.
</Note>

### Telemetry Pipeline backend

The Telemetry Pipeline backend, which manages pipeline infrastructure
and configuration syncing.

```text theme={null}
cloud-api.calyptia.com
```

### Telemetry Pipeline web interface

The Telemetry Pipeline web interface.

```text theme={null}
core.calyptia.com
```

### Helm chart repository

The repository where Telemetry Pipeline Helm charts are stored. This is applicable to
the Helm installation method for
[Kubernetes environments](/ingest/pipeline/v2/install/install-operator/kubernetes-cluster).

```text theme={null}
helm.calyptia.com
```

### Linux installation script

The repository where the `install-core.sh` script is stored. This is applicable to the
installation process for [Linux environments](/ingest/pipeline/v2/install/install-operator/linux).

```text theme={null}
calyptia-core.s3.amazonaws.com
```

### K3s installation resources

Installation resources for K3s. This is applicable to the installation process for
[Linux environments](/ingest/pipeline/v2/install/install-operator/linux).

```text theme={null}
k3s-ci-builds.s3.amazonaws.com
```

### Docker container images

Registry for Docker container images.

```text theme={null}
*.docker.io
```

### Container registry

The Telemetry Pipeline container registry.

```text theme={null}
ghcr.io/calyptia
```

### Registry tokens

Contains the tokens required from the Telemetry Pipeline container registry.

```text theme={null}
ghcr.io/token?scope=repository:calyptia/core:pull&service=ghcr.io ghcr.io/token?scope=repository:calyptia/core/calyptia-fluent-bit:pull&service=ghcr.io
```

### Manifest and container images

Contains the manifest and container images required from the Telemetry Pipeline
container registry.

```text theme={null}
http://ghcr.io/v2/calyptia/core/manifests/latest
```

### Image layers

Contains the image layers when applying latest updates.

```text theme={null}
pkg-containers.githubusercontent.com/objects.githubusercontent.com
```