WebSocket connection to 'ws://localhost:8002/socket' failed: in Docker

[deadcoder0904]

I found at #2958 that the solution is this:

/** @type {import('@remix-run/dev').AppConfig} */
module.exports = {
	ignoredRouteFiles: ["**/.*"],
	serverModuleFormat: "esm",
	dev: {
		port: 8002,
	},
}

but it didn't work.

Then I tried adding this to dockerfile & that didn't work either:

ENV REMIX_DEV_SERVER_WS_PORT 8002

i'm not sure if i have to expose this port too somehow in docker. i don't even know how to do it?

i do have EXPOSE 3000 in there that is mapped in docker-compose.yml to 3001:3000

how do i fix this in docker?

[deadcoder0904]

had to map port 8002:8002 in docker-compose.yml to fix this.

this question had a snippet that solved it for me.

i didn't need to add env variables shown in those stackoverflow answers. apparently, they are for hmr in docker which i haven't tried yet.