Yes, you can create a Hydra client via the CLI tool in the Docker container. However, the client ID is not something you can set yourself. It is automatically generated when you create the client. Here is an example of how you can create a client using the Hydra CLI tool in a Docker container:

bash docker-compose -f quickstart.yml exec hydra \     hydra create client \     --endpoint <http://127.0.0.1:4445> \     --grant-type authorization_code,refresh_token \     --response-type code,id_token,email \     --scope openid,offline_access,profile,email \     --redirect-uri <http://gitlab.example.com:8000/users/auth/Ory_Hydra/callback> \     --token-endpoint-auth-method client_secret_post

After creating the client, you can extract the client ID and client secret using the

jq

tool:

bash client_id=$(echo $client | jq -r '.client_id') client_secret=$(echo $client | jq -r '.client_secret')

Please note that the

--endpoint

flag should be set to the administrative API endpoint of your Ory Hydra server. For more information, you can refer to the [Ory Hydra documentation](https://www.ory.sh/docs/hydra/cli/hydra-create-client).

No, it's not possible to change the client ID after the client has been created. The client ID is an immutable identifier generated by the server. Once a client ID is assigned to a client, it cannot be changed. This is stated in the [Ory API Reference](https://www.ory.sh/docs/reference/api): > 'client_id': {'description': 'OAuth 2.0 Client ID\n\nThe ID is immutable. If no ID is provided, a UUID4 will be generated.', 'type': 'string'} However, you can update other details of the client using the

hydra update client

command. For example, you can update the client name, grant types, response types, and other parameters. Here's an example:

bash hydra update client <client-id-here> -c <http://localhost/cb> -g authorization_code -r code -a core,foobar

For more information, you can refer to the [Ory Hydra documentation](https://www.ory.sh/docs/hydra/cli/hydra-update-client).