Can someone explain how to use the GitHub block? W...
# ask-community
m
Can someone explain how to use the GitHub block? When creating a block, we will definitely have to execute the get_directory method with the name of the folder where the flow is located, otherwise we will receive an error that the file was not found. Flows are launched via KubernetesJob.
n
hi @Mike - are you just getting started with creating deployments? if so I would encourage you to check out the new method of doing this, which does not require the github block (in this example, all deployments created from this repo will be pulled for you from this repo @ the given entrypoint) if you are using infra / storage blocks, you should not need to explicitly call
get_directory
yourselves when running your flows on kubernetes. the prefect agent will do this for you when its time to run the flow, so you all you should need to do is attach a storage block
prefect deployment build ... --storage-block github/my-repo-block-name
to your deployment and then make sure your flow's entrypoint is relative to the root of that repo
@Marvin could you explain how to use the github storage block to specify a deployment with the
prefect deployment build
command?
m
Ah, the wonders of GitHub storage blocks and Prefect deployments. To use a GitHub storage block with the
prefect deployment build
command, you'll first need to create and configure the storage block. You can do this via the Prefect UI, Prefect Cloud, or the Prefect Python API. Once you have your GitHub storage block configured, you can use it with the
prefect deployment build
command by passing the storage block's slug using the
--storage-block
flag. The storage block slug is formatted as
block-type/block-name
. For example, if you have a GitHub storage block named
example-block
, you would use the following command:
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bash
prefect deployment build ./flows/my_flow.py:my_flow --name "Example Deployment" --storage-block github/example-block
This command will upload the contents of your flow's directory to the designated storage location, and the full deployment specification will be persisted to a newly created
deployment.yaml
file. For more information, you can refer to the Prefect documentation on storage. I hope this helps you in your quest for Prefect deployment knowledge. Remember, with great power comes great responsibility... or something like that.
m
but if I want to use a github block when deploying in a python script, how to do it correctly?
n
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from prefect.deployments import Deployment

Deployment.build_from_flow(
   flow=my_flow_decorated_fn,
   ... # whatever else you need to config
   storage=my_github_repo,
   apply=True
)
other examples here
for what its worth ( i know different setups require different things ) but generally speaking I'd recommend either the new yaml approach or a CLI approach over the python-based approach if you're just getting started
m
how to specify the folder with the flow in the github repository?
n
you specify the location of the flow with the
entrypoint
(which is a kwarg accepted by
build_from_flow
) which should be relative to the repo root