Option 1 (recommended): Use the fn cli tool
We recommend using the fn cli tool which will handle all of this for you. But if you'd like to dig in and customize your images, look at Option 2.
Option 2: Build your own images
Packaging a function has two parts:
- Create a Docker image for your function with an ENTRYPOINT
- Push your Docker image to a registry (Docker Hub by default)
Once it's pushed to a registry, you can use the image location when adding a route.
Creating an image
The basic Dockerfile for most languages is along these lines:
# Choose base image
FROM node:alpine
# Set the working directory
WORKDIR /function
# Add your binary or code to the working directory
ADD . /function/
# Set what will run when a container is started for this image
ENTRYPOINT ["node func.js"]
Then build your function image:
fn build
Push your image
fn push
Now you can use that image when creating or updating routes.