Docker compose suggestion to map /opt/app/ui/.next/cache to ./cache

[toddsunpark]

I was getting permission denied errors when the app was trying to write to /opt/app/ui/.next/cache. The directory didn't exist and once I mapped it back I was good to go.

[jorenn92]

Are you using a different user than 1000:1000? I've had some reports where this directory wasn't writable when using a different user.

I believe it would be better to change the default Nextjs config, so the cache folder is in a different (writable by all) place altogether.

[toddsunpark]

Yes! I'm running this on an unRAID server so my default user has to be 99:100. I like your solution better. Just a thought though if you aren't writing cache to a persistent volume don't you lose it every time you move/update your docker container. Unless you meant to move it somewhere in the /opt/data folder.

[KetchupBomb]

I'm noticing this error message on my end as well when it comes to creating the directory /opt/app/ui/.next/cache:

 ⨯ Failed to write image to cache LEDIQ0xbkbu0XCt3GWtQG5OM0wpjsS8soVFxWoTIvpg= [Error: EACCES: permission denied, mkdir '/opt/app/ui/.next/cache'] {
  errno: -13,
  code: 'EACCES',
  syscall: 'mkdir',
  path: '/opt/app/ui/.next/cache'
}

I run via Docker Compose with the following relevant spec:

{
  "container_name": "maintainerr",
  "image": "jorenn92/maintainerr",
  "restart": "unless-stopped",
  "user": "65534:65534",  # nobody:nogroup
  "volumes": [
    "/docker/servarr/maintainerr/data:/opt/data"
  ]
}

The host path is owned correctly:

$ ls -alh /docker/servarr/maintainerr/data/
total 80K
drwxr-xr-x 3 nobody nogroup 4.0K May 20 16:00 .
drwxr-xr-x 3 nobody nogroup 4.0K Jan 19 21:24 ..
drwxr-xr-x 2 nobody nogroup 4.0K May 20 00:00 logs
-rw-r--r-- 1 nobody nogroup  68K May 20 16:00 maintainerr.sqlite

And it shows up in the container owned correctly:

$ ls -alh /opt/data/
total 84K    
drwxr-xr-x    3 nobody   nobody      4.0K May 20 23:00 .
drwxrwxrwx    1 node     node        4.0K Mar 25 14:45 ..
drwxr-xr-x    2 nobody   nobody      4.0K May 20 07:00 logs
-rw-r--r--    1 nobody   nobody     68.0K May 20 23:00 maintainerr.sqlite

But the path /opt/app/ is not part of the volume mount, and /opt/app/ui/.next/ is all owned by node, user 1000:

$ id node
uid=1000(node) gid=1000(node) groups=1000(node),1000(node)

$ ls -alh /opt/app/ui/.next/
total 60K    
drwxr-xr-x    1 node     node        4.0K May 21 05:01 .
drwxr-xr-x    1 node     node        4.0K Mar 25 14:44 ..
-rwxr-xr-x    1 node     node          21 Mar 25 14:44 BUILD_ID
-rwxr-xr-x    1 node     node        4.5K Mar 25 14:44 build-manifest.json
-rwxr-xr-x    1 node     node          20 Mar 25 14:44 package.json
-rwxr-xr-x    1 node     node         362 Mar 25 14:44 prerender-manifest.js
-rwxr-xr-x    1 node     node         312 Mar 25 14:44 prerender-manifest.json
-rwxr-xr-x    1 node     node           2 Mar 25 14:44 react-loadable-manifest.json
-rwxr-xr-x    1 node     node        4.5K Mar 25 14:44 required-server-files.json
-rwxr-xr-x    1 node     node        2.3K Mar 25 14:44 routes-manifest.json
drwxr-xr-x    4 node     node        4.0K Mar 25 14:44 server
drwxr-xr-x    6 node     node        4.0K Mar 25 14:43 static

Just wanting to give more information about the issue.

[jorenn92]

I'm noticing this error message on my end as well when it comes to creating the directory /opt/app/ui/.next/cache:

 ⨯ Failed to write image to cache LEDIQ0xbkbu0XCt3GWtQG5OM0wpjsS8soVFxWoTIvpg= [Error: EACCES: permission denied, mkdir '/opt/app/ui/.next/cache'] {
  errno: -13,
  code: 'EACCES',
  syscall: 'mkdir',
  path: '/opt/app/ui/.next/cache'
}

I run via Docker Compose with the following relevant spec:

{
  "container_name": "maintainerr",
  "image": "jorenn92/maintainerr",
  "restart": "unless-stopped",
  "user": "65534:65534",  # nobody:nogroup
  "volumes": [
    "/docker/servarr/maintainerr/data:/opt/data"
  ]
}

The host path is owned correctly:

$ ls -alh /docker/servarr/maintainerr/data/
total 80K
drwxr-xr-x 3 nobody nogroup 4.0K May 20 16:00 .
drwxr-xr-x 3 nobody nogroup 4.0K Jan 19 21:24 ..
drwxr-xr-x 2 nobody nogroup 4.0K May 20 00:00 logs
-rw-r--r-- 1 nobody nogroup  68K May 20 16:00 maintainerr.sqlite

And it shows up in the container owned correctly:

$ ls -alh /opt/data/
total 84K    
drwxr-xr-x    3 nobody   nobody      4.0K May 20 23:00 .
drwxrwxrwx    1 node     node        4.0K Mar 25 14:45 ..
drwxr-xr-x    2 nobody   nobody      4.0K May 20 07:00 logs
-rw-r--r--    1 nobody   nobody     68.0K May 20 23:00 maintainerr.sqlite

But the path /opt/app/ is not part of the volume mount, and /opt/app/ui/.next/ is all owned by node, user 1000:

$ id node
uid=1000(node) gid=1000(node) groups=1000(node),1000(node)

$ ls -alh /opt/app/ui/.next/
total 60K    
drwxr-xr-x    1 node     node        4.0K May 21 05:01 .
drwxr-xr-x    1 node     node        4.0K Mar 25 14:44 ..
-rwxr-xr-x    1 node     node          21 Mar 25 14:44 BUILD_ID
-rwxr-xr-x    1 node     node        4.5K Mar 25 14:44 build-manifest.json
-rwxr-xr-x    1 node     node          20 Mar 25 14:44 package.json
-rwxr-xr-x    1 node     node         362 Mar 25 14:44 prerender-manifest.js
-rwxr-xr-x    1 node     node         312 Mar 25 14:44 prerender-manifest.json
-rwxr-xr-x    1 node     node           2 Mar 25 14:44 react-loadable-manifest.json
-rwxr-xr-x    1 node     node        4.5K Mar 25 14:44 required-server-files.json
-rwxr-xr-x    1 node     node        2.3K Mar 25 14:44 routes-manifest.json
drwxr-xr-x    4 node     node        4.0K Mar 25 14:44 server
drwxr-xr-x    6 node     node        4.0K Mar 25 14:43 static

Just wanting to give more information about the issue.

Thank you for the detailed information! This makes it a lot clearer.

@toddsunpark, the Next.js cache doesn't need to be persistent. It's something Next.js will rebuild after a reboot.