About el_client_type customizations

[seaona]

hi there 👋 I have a couple of questions around the EL client customization. It's my first time setting up the environment, so apologies in advanced, if I missed something on the documentation 🙇‍♀️

On the README it states that:

The Docker image that should be used for the EL client; leave blank to use the default for the client type
Defaults by client:

• geth: ethereum/client-go:latest

I wanted to know:

1. What does latest refer to here? Does it mean, the latest released version? Or does it mean, what's currently in the master branch?
2. I tried to change the el_client_type value to a specific geth version like this ethereum/client-go:v1.13.10, however I see the error fail: ethereum/client-go:v1.13.10 received an empty image name and we don't have a default for it. Is there something else I need to do in order to setup a custom version for geth?
3. Following up on question 2, if I want to set my local geth build, how should I proceed on doing so? I imagine I would need to create a Docker image of my build and somehow pass it to the yaml config? 🤔

Thank you very much in advance and apologies again if those questions are already solved somewhere else in the docs 🙏

[barnabasbusa]

latest will refer to the reference of their dockerhub image, which currently is: https://hub.docker.com/layers/ethereum/client-go/latest/images/sha256-e3a568edc60d57261bdd774c852fd20b0a6ac347354020d9eb8a0fdd6e31b091?context=explore
latest will mean different things for different projects, as far as I know geth's latest dockerhub image is automatically built/published based on the latest master branch.

el_client_type can be geth/nethermind/reth ...
what you looking for is el_client_image field, where you can specify which image you plan to use.

However, we currently have a pretty big refactoring PR which will change these names (once the pr gets merged). #508

3. You can build a local docker image, tag it with something like testing-geth-image:latest, then for the el_client_image you specify that image name. Kurtosis will try to find the image locally first, and if it can't find it, it will try to fetch it from dockerhub.

[seaona]

Thank you so much @barnabasbusa 😍 this has been really helpful and clarifies all the questions I had.
I'll keep an eye on the PR, for the name change 👍