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# Kubernetes System Namespace
The `kube-system` namespace contains several services used for the operation of
the Kubernetes cluster.
## Folder Contents
### `coredns-custom.yaml`
This is a custom CoreDNS configuration file loaded in by Linode allowing us to
add additional configuration options to our cluster DNS server, such as
additional logging of specific queries.
### `nginx`
This folder contains the deployment of the `ingress-nginx` service which handles
all inbound traffic to the cluster, TLS termination and forwarding to the
relevant internal services.
### `reflector`
This is a system component which allows specific annotations on secrets to
trigger them to replicate to a selected set of other namespaces.
See the README.md in the folder for more information.
### `metrics-server`
This is the metrics server component for Kubernetes that allows commands like
`kubectl top` to work successfully. It is deployed from a Helm chart.
## Other components
We also deploy [`kube-state-metrics`](https://github.com/kubernetes/kube-state-metrics) again using the manifests located in the repository.
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