# Setup Addons

## Add-On Components

Upon deploying a Kubernetes cluster, it becomes essential to install a series of add-on components (addons). These addons are often crucial for the regular operation of the cluster.

The [addon-manager](https://kubernetes.feisky.xyz/en/setup/addon-list/addon-manager), commonly utilized to manage the add-ons in a cluster, operates within the Kubernetes cluster's Master node. It oversees all the extensions in the `$ADDON_PATH` (defaulting to `/etc/kubernetes/addons/`) directory to ensure they are functioning as intended.

Some of the common components include:

* [addon-manager](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/addon-manager)
* [cluster-loadbalancing](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/cluster-loadbalancing)
* [dashboard](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dashboard)
* [device-plugins/nvidia-gpu](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/device-plugins/nvidia-gpu)
* [dns-horizontal-autoscaler](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dns-horizontal-autoscaler)
* [dns](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dns)
* [fluentd-elasticsearch](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/fluentd-elasticsearch)
* [ip-masq-agent](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/ip-masq-agent)
* [istio](https://istio.io)
* [kube-proxy](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/kube-proxy)
* [metrics-server](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/metrics-server)
* [node-problem-detector](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/node-problem-detector)
* [prometheus](https://prometheus.io/)
* [storage-class](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/storage-class)

For additional extensions, refer to [Installing Addons](https://kubernetes.io/docs/concepts/cluster-administration/addons/) and [Legacy Addons](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons).

***

## Power-Up Your Kubernetes: Essential Add-Ons for Peak Performance

Once you've got your Kubernetes cluster up and running, think of it like a smartphone without apps—it's functional, but you're not getting the most out of it. That's where add-ons come in—they're like the apps that power-up your cluster's capabilities.

Picture a digital maestro—[addon-manager](https://kubernetes.feisky.xyz/en/setup/addon-list/addon-manager)—nestled within the Master node of your Kubernetes command center. This wizard is keeping an eagle eye on the `$ADDON_PATH` (which, by default, is the `/etc/kubernetes/addons/` directory), ensuring every component is humming along just right.

Ready for the tour? Here's the all-star lineup of add-ons that can turn your cluster into a powerhouse:

* **Command Central,** [**addon-manager**](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/addon-manager): Keeps your add-ons tightly regulated.
* **Traffic Cop,** [**cluster-loadbalancing**](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/cluster-loadbalancing): Directs digital traffic efficiently.
* **Mission Control,** [**dashboard**](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dashboard): A clear visual on your cluster activities.
* **The Muscle,** [**device-plugins/nvidia-gpu**](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/device-plugins/nvidia-gpu): Amping up your computing power.
* **The Balancer,** [**dns-horizontal-autoscaler**](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dns-horizontal-autoscaler): Keeps network naming at peak performance.
* **The Communicator,** [**dns**](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dns): For seamless service-name resolutions.
* **The Analyzer,** [**fluentd-elasticsearch**](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/fluentd-elasticsearch): Dives deep into data logs.
* **Stealth Mode,** [**ip-masq-agent**](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/ip-masq-agent): Keeps IP addresses under wraps.
* **The Envoy,** [**istio**](https://istio.io): Smart networking for your services.
* **The Enforcer,** [**kube-proxy**](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/kube-proxy): Manages network rules and connections.
* **The Scout,** [**metrics-server**](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/metrics-server): Keeps an eye on resource usage.
* **The Watchdog,** [**node-problem-detector**](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/node-problem-detector): On the lookout for pesky issues.
* **The Statistician,** [**prometheus**](https://prometheus.io/): Monitors and alerts like a pro.
* **The Organizer,** [**storage-class**](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/storage-class): Manages your storage needs efficiently.

For those hungry for even more power-ups, gear up with additional extensions detailed in [Installing Addons](https://kubernetes.io/docs/concepts/cluster-administration/addons/) and for a nostalgic twist, visit [Legacy Addons](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons). Your Kubernetes cluster is set for the big leagues now!