[DOCKER] Cache files can't get generated in a rootless docker container / Openshift

[b2cc]

I recently spun up Rallly on Openshift, which by default locks down containers ("pods") in various ways. Amongst others, one thing it does is assign an arbitrary user ID to the container, which can mess with applications that are unaware of this behavior.

In this case, after the application has finished start-up, an error is displayed since the application can't write to its own filesystem:

Failed to update prerender cache for /404 [Error: EACCES: permission denied, open '/app/apps/web/.next/server/app/404.html'] {
  errno: -13,
  code: 'EACCES',
  syscall: 'open',
  path: '/app/apps/web/.next/server/app/404.html'
}

User ID in container:

# log into container
~# oc rsh rallly-6c8d89969d-vwdr8

# get user ID
$ id
uid=1000980000(1000980000) gid=0(root) groups=0(root),1000980000

# list permissions of folders
$ ls -lah /app/apps/web/.next/server/   
[ ... ]
drwxr-xr-x. 25 nextjs nodejs 4.0K Mar 15 05:10 app

Is there a way to set the cache directory for the framework via e.g. a NEXT_ env variable?

EDIT: I found this, maybe there is another way?

• Feature Request: Allow configuration of cache dir vercel/next.js#58864
• Allow configuration of cache dir vercel/next.js#10111

To Reproduce
Start the container in rootless mode

Expected behavior
Cache files get generated successfully

Additional context
Tested on Openshift 4.14 / x86_64

Thanks for the great app and your support!

[jirutka]

I have the same problem when running Rallly from a read-only filesystem.

Do I understand it correctly that it’s trying to create a file 404.html in apps/web/.next/server/? This isn’t even a cache directory.

[lukevella]

Unfortunately, I'm not aware of a solution and cannot spare the time to research this. Please feel free to reopen with a solution if you are aware of one.