Nodes' binds option mounts folders with uid of user instead of the root

[mdahshan]

Hi Team,

I am having an issue with the bind option for the node kind.

For the following topology:

    ftpserver:
      kind: linux
      image: ftpserver:latest
      group: server        
      binds:
        - ./vsftpd.conf:/etc/vsftpd/vsftpd.conf

When deploying the topology, the file vsftpd.conf has owner:group as 1000:1000 instead of the root. This breaks the functionality of the vsftpd as it refuses to start due to incorrect owner.

This problem only happens on the amd64 version. The arm64 version mounts correctly with root ownership.

Containerlab version:

version: 0.57.2
 commit: a6b1f044
   date: 2024-09-16T14:12:31Z

The Dockerfile for ftpservers looks as follows:

FROM alpine:latest
RUN apk add --no-cache vsftpd

EXPOSE 20 21

RUN rm -rf /var/cache/apk/*

ENTRYPOINT ["vsftpd", "/etc/vsftpd/vsftpd.conf"]

Thanks for your help

[hellt]

Hi what are the original permissions on the ./vsftpd.conf in your directory?

ls -la vsftpd.conf

[mdahshan]

The permissions in both machines are:

-rw-r--r--   1 mostafa mostafa    88 Sep 19 10:31 vsftpd.conf

$ echo $UID
1000

Both machines are running Debian 12. The one that works fine is running on UTM on Apple Silicon.

$ docker exec clab-netfor3-ftpserver ls -l /etc/vsftpd/
total 4
-rw-r--r--    1 root     root            88 Sep 19 00:31 vsftpd.conf

The second one is on lib-virt on amd64. I also tested on Ubuntu 24.04 and I encountered the same issue. The ftpserver container refuses to start. When I changed the startup command and listed the directory content, I got 1000 1000 as owner and group.

[hellt]

your uid/gid is 1000, docker mounts the files with the same permissions you can

• chmod your conf file to 777 if you wish and then vsftpd should be able to use it.
• chown the file to 0:0 to make it root owned
• change your dockerfile so that a script first runs the chown to root on the mounted file and then calls the vsftpd daemon

This is not something that containerlab controls.

[mdahshan]

Thanks for your help. I will do that.