Default port 3000 seems to be the only one that works for me Health check is a problem This one is unchanged in config/deploy.yml

service: sample-nodejs

image: jaketrent/sample-nodejs

servers:
  - 143.244.184.41

registry:
  username: jaketrent

  password:
    - KAMAL_REGISTRY_PASSWORD

Dockerfile

EXPOSE 3000

# syntax=docker/dockerfile:1

# Comments are provided throughout this file to help you get started.
# If you need more help, visit the Dockerfile reference guide at
# https://docs.docker.com/engine/reference/builder/

ARG NODE_VERSION=20.5.1

FROM node:${NODE_VERSION}-alpine

# Use production node environment by default.
ENV NODE_ENV production


WORKDIR /usr/src/app

# Download dependencies as a separate step to take advantage of Docker's caching.
# Leverage a cache mount to /root/.npm to speed up subsequent builds.
# Leverage a bind mounts to package.json and package-lock.json to avoid having to copy them into
# into this layer.
RUN --mount=type=bind,source=package.json,target=package.json \
    --mount=type=bind,source=package-lock.json,target=package-lock.json \
    --mount=type=cache,target=/root/.npm \
    npm ci --omit=dev

RUN apk add curl

# Run the application as a non-root user.
USER node

# Copy the rest of the source files into the image.
COPY . .

# Expose the port that the application listens on.
EXPOSE 3000

# Run the application.
CMD node src/index.js

.env KAMAL_REGISTRY_PASSWORD only (no PORT)

It does have a compose.yml But I don't know if it affects anything