NX NextJs App doesn't work on read-only docker container

Question

I have a Dockerfile that builds an nx app and then serves it, however that docker container runs in read-only mode and that causes this problem:

    EROFS: read-only file system, open '/app/node_modules/.cache/nx/project-graph.json~c3501751'
Error: EROFS: read-only file system, open '/app/node_modules/.cache/nx/project-graph.json~c3501751'
    at Object.openSync (node:fs:601:3)
    at writeFileSync (node:fs:2249:35)
    at writeJsonFile (/app/node_modules/nx/src/utils/fileutils.js:56:28)
    at writeCache (/app/node_modules/nx/src/project-graph/nx-deps-cache.js:105:43)
    at /app/node_modules/nx/src/project-graph/build-project-graph.js:58:44
    at Generator.next (<anonymous>)
    at fulfilled (/app/node_modules/tslib/tslib.js:164:62)

I don't have serve listed in my cache operations "cacheableOperations": ["build", "lint", "test", "e2e"], so I don't know why it's trying to cache on nx serve (@nx/next:server)

I tried adding "skipNxCache": true to the taskRunnerOptions in nx.json and also I tried using the --skip-nx-cache flag in the serve command and nothing works.

Why is serve using cache? any recommendations on how to disable it?

I'm using nx 16.3.0

Answer 1

This worked for me to disable cache write:

ENV NX_DAEMON=false
ENV NX_SKIP_NX_CACHE=true
ENV NX_CACHE_PROJECT_GRAPH=false

The explanation is, if the Daemon is enabled cache is written even if the nx skip cache flag is set to true. Disabling the Daemon then disabling the cache project graph actually disables the cache. More details here