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chore: add note that HA is flagged + additional instructions #4601

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23 changes: 12 additions & 11 deletions docs/admin/high-availability.md
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Expand Up @@ -15,6 +15,8 @@ workspace <-> coder and user <-> coder connections.

## Setup

> We're stress testing High Availability this week before we enable it by default. To try HA beforehand, set `CODER_EXPERIMENTAL=true` for the Coder server as well as the additional configuration options below.

Coder automatically enters HA mode when multiple instances simultaneously connect
to the same Postgres endpoint.

Expand All @@ -28,32 +30,31 @@ embedded relay (default). If you're using [custom relays](../networking.md#custo

Here's an example 3-node network configuration setup:

| Name | `CODER_ADDRESS` | `CODER_DERP_SERVER_RELAY_URL` | `CODER_ACCESS_URL` |
| ------- | --------------- | ----------------------------- | ----------------------- |
| Name | `CODER_ADDRESS` | `CODER_DERP_SERVER_RELAY_URL` | `CODER_ACCESS_URL` |
| --------- | --------------- | ----------------------------- | ------------------------ |
| `coder-1` | `*:80` | `http://10.0.0.1:80` | `https://coder.big.corp` |
| `coder-2` | `*:80` | `http://10.0.0.2:80` | `https://coder.big.corp` |
| `coder-3` | `*:80` | `http://10.0.0.3:80` | `https://coder.big.corp` |


## Kubernetes

If you installed Coder via
[our Helm Chart](../install/kubernetes.md#install-coder-with-helm), just
increase `coder.replicaCount` in `values.yaml`.


If you installed Coder into Kubernetes by some other means, insert the relay URL
via the environment like so:

```yaml
env:
- name: POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
- name: CODER_DERP_SERVER_RELAY_URL
value: http://$(POD_IP)
env:
- name: POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
- name: CODER_DERP_SERVER_RELAY_URL
value: http://$(POD_IP)
```

Then, increase the number of pods.

## Up next
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