Install Docker inside LXC container - Proxmox VE

install-docker-inside-lxc.txt

1.Add “aufs” or “overlay” (or both) to /etc/modules-load.d/modules.conf in your PVE host and reboot. Check it with lsmod | grep -E 'overlay|aufs'
2.Use a LXC image with unprivilege features (you can check them here: https://uk.images.linuxcontainers.org/)
3.Create the container with unprivilege option, and “keyctl=1, nesting=1” features (Options section in proxmox).
4.Maybe you would want to mount an external point into /var/lib/docker (Resources section in proxmox)
5.Check this link (https://docs.docker.com/storage/storagedriver/overlayfs-driver/#configure-docker-with-the-overlay-or-overlay2-storage-driver) to change your storage-driver in docker to use aufs or overlay2.
6.Install portainer: https://portainer.readthedocs.io/en/latest/deployment.html

Voilá…

Please note that overlay/overlay2 won't when ZFS is used as the underlying filesystem. It will cause following error on the Proxmox Host:
kernel: overlayfs: filesystem on '/var/lib/docker/check-overlayfs-support458510559/upper' not supported as upperdir

It's possible to use fuse-overlayfs https://c-goes.github.io/posts/proxmox-lxc-docker-fuse-overlayfs/

Hey there,

wanted to pop bye te tell you that your Blogpost helped me fixing my issues as discussed here: https://forums.docker.com/t/docker-daemon-stops-from-time-to-time

Wanted to tell you, since you don't allow comments on your blog, that for me it worked on Proxmox only with nesting and FUSE enabled. The other features are not needed in my case.

Cheers!

Fuse-Overlay seems to break Proxmox Backups, I haaven't found a solution yet, but it cannot backup the /var/lib/docker/fuse-overlay/ directory in full with this config.

Aaaah that’s the reason, I see. Well my fix was to backup with the stop mode, not Snapshot or suspend