argo-cd/docs/webhook.md

# Git Webhook Configuration

## Overview

ArgoCD will poll git repositories every three minutes for changes to the manifests. To eliminate
this delay from polling, the API server can be configured to receive webhook events. ArgoCD supports
git webhook notifications from GitHub, GitLab, and BitBucket. The following explains how to configure
a git webhook for GitHub, but the same process should be applicable to other providers.

### 1. Create the webhook in the git provider

In your git provider, navigate to the settings page where webhooks can be configured. The payload
URL configured in the git provider should use the /api/webhook endpoint of your ArgoCD instance
(e.g. https://argocd.example.com/api/webhook). Input an arbitrary value in the secret. The same
value will be used when configuring the webhook in step 2.

![Add Webhook](assets/webhook-config.png "Add Webhook")

### 2. Configure ArgoCD with the webhook secret

In the `argocd-secret` kubernetes secret, configure one of the following keys with the git provider
webhook secret configured in step 1.

| Provider  | K8s Secret Key           |
|---------- | ------------------------ |
| GitHub    | `github.webhook.secret`  |
| GitLab    | `gitlab.webhook.secret`  |
| BitBucket | `bitbucket.webhook.uuid` |

Edit the ArgoCD kubernetes secret:
```
kubectl edit secret argocd-secret
```

TIP: for ease of entering secrets, kubernetes supports inputting secrets in the `stringData` field,
which saves you the trouble of base64 encoding the values and copying it to the `data` field.
Simply copy the shared webhook secret created in step 1, to the corresponding 
GitHub/GitLab/BitBucket key under the `stringData` field:


```
apiVersion: v1
kind: Secret
metadata:
  name: argocd-secret
  namespace: argocd
type: Opaque
data:
...

stringData:
  # github webhook secret
  github.webhook.secret: shhhh! it's a github secret

  # gitlab webhook secret
  gitlab.webhook.secret: shhhh! it's a gitlab secret

  # bitbucket webhook secret
  bitbucket.webhook.uuid: your-bitbucket-uuid

```

After saving, the changes should take affect automatically.