[SOLVED] Docker inside LXC (net.ipv4.ip_unprivileged_port_start error)

[spacedgrey]

It's a yes please from me also for the fix to be ported to Proxmox 8.

 

[Smvb64]

Hoping for Proxmox 8 fix - broken for me too
Update: I see on the bug tracker that a patch has been released
Hopefully, it gets pushed

 

[chunkynutella]

Is there a way, and if so is there any danger, in installing lxc-pve 6.0.5-3 on PVE 8.4?

 

[Johannes S]

Is there a way, and if so is there any danger, in installing lxc-pve 6.0.5-3 on PVE 8.4?

No. In theory you could install the package from PVE9 but then you will also need to update dependencies resulting in a kind of Frankensteinian mix of PVE8, PVE9, Debian12 and Debian13. This tends to make more problems than it's worth:
https://wiki.debian.org/DontBreakDebian#Don.27t_make_a_FrankenDebian



@fabian referenced a Patch in https://bugzilla.proxmox.com/show_bug.cgi?id=7057 so there will be a Bugfix soon.

This being said please note that for Debian 12 ( the base of PVE8) and PVE8 are still supported but are only guaranteed to get security patches and only until August 2026. So I would really consider upgrading to PVE9 if you have no good reason to stick with PVE8

 

[itsmarko]

Is there a way, and if so is there any danger, in installing lxc-pve 6.0.5-3 on PVE 8.4?

The 8.4 patch was released yesterday and it’s currently on pvetest. It’ll probably show up on ‘pve-no-subscription’ soon as well.

 

[spacedgrey]

I'm pleased to report that lxc-pve 6.0.0-2 appeared in the PVE 8 pve-no-subscription repository today and that after upgrading lxc-pve from 6.0.0-1 to 6.0.0-2 docker 29 runs without issue in my LXC containers.

Thanks for porting this patch to PVE 8.

root@pve01:~# pveversion
pve-manager/8.4.14/b502d23c55afcba1 (running kernel: 6.8.12-17-pve)

root@pve01:~# grep "upgrade lxc-pve" /var/log/dpkg.log
2025-11-27 12:51:24 upgrade lxc-pve:amd64 6.0.0-1 6.0.0-2

root@doc01:~# grep "upgrade docker" /var/log/dpkg.log
2025-11-27 12:53:07 upgrade docker-ce-cli:amd64 5:28.5.2-1~debian.12~bookworm 5:29.0.4-1~debian.12~bookworm
2025-11-27 12:53:08 upgrade docker-ce:amd64 5:28.5.2-1~debian.12~bookworm 5:29.0.4-1~debian.12~bookworm
2025-11-27 12:53:10 upgrade docker-buildx-plugin:amd64 0.29.1-1~debian.12~bookworm 0.30.1-1~debian.12~bookworm
2025-11-27 12:53:11 upgrade docker-ce-rootless-extras:amd64 5:29.0.0-1~debian.12~bookworm 5:29.0.4-1~debian.12~bookworm