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Document authentication mechanisms for gcloud #511

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Jul 14, 2021
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Document authentication mechanisms for gcloud #511

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19 changes: 18 additions & 1 deletion docs/reference/tools.md
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Expand Up @@ -91,4 +91,21 @@ new files.
[`google-cloud-sdk`](https://cloud.google.com/sdk/docs/install) is the primary
commandline tool used to interact with Google Cloud Platform (GCP). Our deployment
scripts use it to authenticate to GCP, and it is very helpful in [debugging node
issues](../howto/operate/node-administration.md).
issues](../howto/operate/node-administration.md).

### Tips

#### Authentication

`gcloud` has two authentication flows, and that can get quite confusing since we
work on a number of clusters with different Google credentials.

[`gcloud auth login`](https://cloud.google.com/sdk/gcloud/reference/auth/login)
provides credentials for `gcloud` commands like `gcloud compute instances list`
or `gcloud container clusters list`.

[`gcloud auth application-default login`](https://cloud.google.com/sdk/gcloud/reference/auth/application-default/login)
provides credentials for *other tools* (such as `helm`, `kubectl`, `sops`) to
authenticate to Google Cloud Platform on your behalf. So if `sops` or
`kubectl` is complaining about authentication, make sure you are authenticated
correctly with `application-default`