CODEWITHSUNDEEP
google-cloud-platformcontainersbuildpackentry-point
Habaek
Habaek

Reputation: 41

How to change the Container Entrypoint in Buildpacks?

I am using buildpacks to build a container image of node js application.

the default entrypoint is cnb/process/web that will execute npm start.

I need to change the cmd & arguments from npm start to node {file.js}

Here's the command that I used to build image

pack build --builder gcr.io/buildpacks/builder:v1 {image-name}

is there any way to change the container entrypoint of the buildpack image? Thanks in Advance!

Upvotes: 1

Views: 1172

Answers (2)

jonashackt
jonashackt

Reputation: 14429

There's another neat option, if you use nodejs buildpacks. The docs state to add BP_LAUNCHPOINT as a --env parameter like this:

pack build --builder gcr.io/buildpacks/builder:v1 --env BP_LAUNCHPOINT="file.js" {image-name}

When running the image as a container, it will start with the command node file.js, where file.js lies within the workspace directory in the containers root.

In my case I had a Nuxt 3 build app, where my launchpoint is this: --env BP_LAUNCHPOINT=".output/server/index.mjs" and thus uses node to start the file workspace/.output/server/index.mjs inside the root of the container.

Upvotes: 0

codefinger
codefinger

Reputation: 10318

Some buildpacks support a Procfile, which allows you to configure the process used to launch the image like this:

web: npm start

For a more buildpacks-native approach see the documentation on launch processes. https://buildpacks.io/docs/app-developer-guide/run-an-app/

Upvotes: 1

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