this post was submitted on 18 Jan 2024
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Radarr: Path: Folder '/data/' is not writable by user 'abc' (www.startpage.com)
submitted 2 years ago by PrivateNoob@sopuli.xyz to c/selfhosted@lemmy.world
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I'm trying to setup my first homeserver with pods alone but I can't add my mounted /data (it's an external HDD) folder to the root folder, but the /app and /config works. It's a common issue but somehow I wasn't able to solve it.

OS: Rocky Linux 9.3

External HDD (WD Elements)

external HDD in /etc/fstab:

# WD Elements drive
UUID=4655386a-5ccf-4c7b-ad6a-c0b90ccf8454 /home/privatenoob/media/storage1 xfs defaults 0 0

radarr.service:

[Unit]
Description=Radarr Movie Server
After=network.target

[Service]
ExecStart=podman run --name=radarr -e PUID=1000 -e PGID=1000 -e UMASK=002 -p 7878:7878 -v radarr-config:/config -v /home/privatenoob/media/storage1/Filmek:/data --restart unless-stopped lscr.io/linuxserver/radarr:latest
ExecStop=podman stop radarr
Restart=on-failure

[Install]
WantedBy=default.target

Permissions:

drwxr-xr-x. 2 privatenoob privatenoob 6 Jan 17 16:52 Filmek

drwxr-xr-x   4 abc    users    139 Jan 18 19:44 config
drwxr-xr-x   2 root   root       6 Jan 17 15:52 data

chown -R 1000:1000 /data didn't work. It gave permission denied, even though I used root (probably this is because of -e PUID=1000?)

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[–] genie@lemmy.world 3 points 2 years ago (1 children)

There are a few ways around it. The simplest is to add the --privileged option.

The more secure method with podman is by specifying a user (ex -u 10001:10001) from your extended subuid:subgid range after your full and proper setup of rootless podman :-)

Then instead of chown you'll want to use the oddly named podman unshare tool to automatically set the permissions of the host directory. You would then want to start your service with systemctl --user instead of sudo systemctl

[–] PrivateNoob@sopuli.xyz 1 points 2 years ago* (last edited 2 years ago) (1 children)

Okay so I've done these steps (it seems rootless podman have been setup by Rocky automatically):

  1. Get subuid:subgid with /etc/subuid:

privatenoob:100000:65536

2.:Changed ExecStart to this:

ExecStart=podman run --name=radarr -u 100000:65536 -p 7878:7878 -v radarr-config:/config -v /home/privatenoob/media/storage1/Filmek:/data --restart unless-stopped lscr.io/linuxserver/radarr:latest

3.: podman unshare chown -R 100000:65536 /home/privatenoob/media/storage1/Filmek/

Unfortunately unsharing gave me invalid arguments.

chown: changing ownership of '/home/privatenoob/media/storage1/Filmek/': Invalid argument

I have tried by leaving the -e PUID=1000 parts on but those didn't work either. Yeah and I'm using systemctl --user. Thanks for your help!

[–] genie@lemmy.world 3 points 2 years ago

Ah! I think I see the confusion.

# /etc/subuid
privatenoob:100000:65536

This denotes the range of subuids that are available to your user.

-u 100000:65536

This part specifies two things ([UID]:[GID]) even though it's the same syntax as the earlier part that specifies one range :)

I suspect what you will want to do is use the following:

# change ownership of the directory to the UID:GID that matches something in your subuid:subgid range, in this case 10000:10000
podman unshare chown -R 100000:10000 /home/privatenoob/media/storage1/Filmek/

Then we can specify that the user in the container can match the user (UID) we specified above:

ExecStart=podman run --name=radarr -u 10000:10000 -p 7878:7878 -v radarr-config:/config -v /home/privatenoob/media/storage1/Filmek:/data --restart unless-stopped lscr.io/linuxserver/radarr:latest

As a note, if you copy/pasted that ExecStart line, you might have gotten the invalid argument error because you entered 100000 (outside of your subuid range, i.e. >65536) instead of 10000.

There's a nice guide that gives a great walkthrough. I'll dig through my bookmarks and add it here when I get some time.

Hope this helps!