I am new to Docker and Fly.io, and trying to get a very basic Nodejs backend hosted, but running into an error. You can see my repo here. Locally, I've added a Dockerfile to backend/ that looks like this:
FROM node:18-alpine
WORKDIR /app
COPY package*.json ./
RUN npm ci --omit=dev
COPY . .
EXPOSE 5000
CMD ["node", "app.js"]
Then, in WSL2, I ran docker build . and docker run -dp 5000:5000 [image ID]. The backend is showing at localhost:5000 as well as feeding data to the frontend correctly.
But when I run flyctl launch, it keeps giving me Error failed to fetch an image or build from source: error building: error during connect: Post "http://[a very long URL]": EOF.
Someone suggested that the auto-generated fly.toml defaulting to internal_port = 8080 was the issue, so I tried changing it to match Express and Docker with 5000, but got the same error.
Just in case: I have a bad Internet connection and I don't know if that could be the problem--a timeout?
Can someone help me??
I was able to fix this and I'm posting it here for others who I saw had the same issue.
app.listen, so that was there (didn't solve my issue but maybe someone else's)internal_port = 8080 no matter what the Dockerfile says)flyctl launch againMy guess is that the problem was that just altering the 5000 to 8080 in the fly.toml file that had been made during a failed build was not enough. It needed to be correct from the start.