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Added doc example of mounting k8s secrets as ENV variables to user pods without values.yaml #1462

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Added doc example of mounting k8s secrets as ENV variables to user pods without values.yaml #1462

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22 changes: 22 additions & 0 deletions doc/source/advanced.md
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Expand Up @@ -129,6 +129,28 @@ hub:
# some other code
```

Example of mounting kubernetes secrets as environmeent variables into spawned user pods via `hub.extraConfig` without having to expose them in your `values.yaml`. Useful for example, if you want to provide credentials for reading protected external resources.

```yaml
hub:
extraConfig:
...
10-secretToEnv: |
from kubernetes import client
def modify_pod_hook(spawner, pod):
pod.spec.containers[0].env.append(
client.V1EnvVar(
name='YOUR_ENV_VARIABLE',
value_from=client.V1EnvVarSource(
secret_key_ref=client.V1SecretKeySelector(
name='your-secret',
key='SECRET_KEY',
))))
return pod
c.KubeSpawner.modify_pod_hook = modify_pod_hook
...
```

### `custom` configuration

The contents of `values.yaml` is passed through to the Hub image.
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