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Is there any documentation on how to generate an API key for a self hosted graphql server?

I'm seeing this graphql:
```mutation {
  create_api_key(input: { user_id: &lt;user_id&gt;, name: "my-api-key" }) {
    key
  }
}```
but I'm not sure where to get the user_id from (on a self hosted machine).

trying to connect to the graphql server
`prefect agent local start --api IP_ADDRESS`

triggers:
```...
line 153, in _get_auth_tenant
    raise ValueError("You have not set an API key for authentication.")
ValueError: You have not set an API key for authentication.```

There are no API keys in the open source Prefect Server — there’s no authentication built in.

Have you set `prefect backend server` on your agent’s machine?

oops, it appears that got set incorrectly. retried and receiving:
```[2022-10-04 18:40:12,679] INFO - agent | Registering agent...```
and hang. No agents appear to be popping up on the web console.

specifically I tried:
`prefect agent local start --api http://&lt;IP_ADDR&gt;`

Ah, ok. Looks like you need to do:
```prefect agent local start --api http://&lt;ADDR&gt;:4200```

OK, I think this is all set. Thank you Michael.