# Components The Content Cache charm is deployed together with other charms to provide backend configuration and, optionally, ingress in front of the cache. ## Content Cache The [Content Cache](https://charmhub.io/content-cache) charm is the primary charm of the project. It is a machine charm that manages an NGINX instance configured as a content cache. It exposes a `cache-config` endpoint (interface: `content-cache-config`) that a backend-configuration charm uses to describe which backends to cache, and a `certificates`/`receive-ca-cert` pair of endpoints used for TLS. ## Content Cache Backends Config The [Content Cache Backends Config](https://charmhub.io/content-cache-backends-config) charm is a subordinate charm to the Content Cache charm. It provides the Content Cache charm with the configuration required to expose a set of backend services behind the caching capabilities of the Content Cache charm, directly over the `cache-config` endpoint. ## Ingress configurator The [Ingress configurator](https://charmhub.io/ingress-configurator) charm is an alternative way to configure Content Cache’s backends. Like Content Cache Backends Config, it integrates with Content Cache over the `cache-config` endpoint, translating its own configuration options (backend addresses and ports, health check parameters, cache validity, TLS/hostname settings) into the `content-cache-config` relation data that Content Cache consumes. Deploying Ingress configurator together with the [HAProxy](https://charmhub.io/haproxy) charm (over the `haproxy-route` interface) additionally provides an ingress layer in front of Content Cache, adding hostname/path-based routing, TLS termination, DDoS protection, and other features that Content Cache Backends Config does not offer on its own. See the [Ingress configurator documentation](https://canonical.com/juju/docs/ingress-configurator-charm/latest/) for its full configuration reference, and [Tutorial](https://canonical.com/juju/docs/content-cache-charms/latest/tutorial/deploy-with-ingress-configurator-and-haproxy/index.html.md#tutorial-advanced-ingress) for a walkthrough of this deployment.