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

# etcd

> Deploy etcd on Control Plane using the Template Catalog. Covers configuration, volumes, scaling, and distributed key-value store cluster setup with peer discovery.

## Overview

etcd is a distributed, reliable key-value store designed for the most critical data of a distributed system. It provides consistent coordination, service discovery, and configuration management across distributed systems, making it a common foundation for cluster health and orchestration. This template deploys an etcd cluster as a stateful workload with configurable replica count and persistent storage.

### What Gets Created

* **Stateful Workload** — An etcd cluster with a configurable number of replicas (default: 3).
* **Volume Set** — Persistent storage for etcd data.
* **Secret** — An opaque startup script secret that handles cluster initialization, peer URL configuration, and replica setup.
* **Identity & Policy** — An identity bound to the workload with `reveal` access to the startup script secret.

<Note>
  This template does not create a GVC. You must deploy it into an existing GVC.
</Note>

## Installation

This template has no external prerequisites. To install, follow the instructions for your preferred method:

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    Manage templates from your terminal
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    Declare templates in your Terraform configurations
  </Card>

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    title="Pulumi"
    href="/template-catalog/install-manage/pulumi"
    icon={<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" id="Pulumi-Icon--Streamline-Svg-Logos" height="24" width="24">
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        Pulumi Icon Streamline Icon: https://streamlinehq.com
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## Configuration

The default `values.yaml` for this template:

```yaml theme={null}
replicas: 3 # minimum 3, must be odd

resources:
  cpu: 1
  memory: 2Gi

multiZone: false

volumeset:
  capacity: 10 # initial capacity in GiB (minimum is 10)

internal_access:
  type: same-gvc # options: same-gvc, same-org, workload-list
  workloads: # Note: can only be used if type is same-gvc or workload-list
    #- //gvc/GVC_NAME/workload/WORKLOAD_NAME
```

### Replicas

* `replicas` — Number of etcd instances in the cluster (minimum 3).

<Note>
  The replica count must always be an odd number. etcd uses the Raft consensus algorithm, which requires a majority quorum — an odd number of members ensures a quorum can always be reached and avoids split-brain scenarios.
</Note>

### Resources

* `resources.cpu` / `resources.memory` — CPU and memory allocated to each etcd instance (default: 1 CPU, 2Gi). These can be lowered for lighter workloads. See the [etcd hardware recommendations](https://etcd.io/docs/v3.6/op-guide/hardware/) for guidance.

### Storage

* `volumeset.capacity` — Persistent volume size in GiB for etcd data (minimum 10).

### Multi-Zone

* `multiZone` — When `true`, distributes replicas equally across available zones for higher availability.

<Note>
  Not all locations support multi-zone deployments. Confirm that your target location supports multi-zone before enabling this option.
</Note>

### Internal Access

The `internal_access` section controls which workloads can reach the etcd cluster:

| Type            | Description                                                     |
| --------------- | --------------------------------------------------------------- |
| `same-gvc`      | Allow access from all workloads in the same GVC                 |
| `same-org`      | Allow access from all workloads in the same organization        |
| `workload-list` | Allow access only from specific workloads listed in `workloads` |

## External References

<CardGroup cols={2}>
  <Card title="etcd Documentation" icon="book" href="https://etcd.io/docs/v3.6/">
    Official etcd documentation
  </Card>

  <Card title="Hardware Recommendations" icon="server" href="https://etcd.io/docs/v3.6/op-guide/hardware/">
    etcd hardware and resource sizing guidelines
  </Card>

  <Card title="etcd Template" icon="github" href="https://github.com/controlplane-com/templates/tree/main/etcd">
    View the source files, default values, and chart definition
  </Card>
</CardGroup>