Configure Docker for LXC in Proxmox
Using Docker inside LXC can be challenging, but here’s what works for me. A few gotcha’s about my setup is that it is not being used for production use, and I would not recommend it. I am using ZFS storage for my Linux Container, this will mean this setup may not work if you’re using NFS or LVM storage configurations. Additionally, I am using docker-compose as some of my docker containers are linked together.
Configure Docker for LXC
Install docker-ce on Ubuntu 19.04 LXC container and add $USER to docker group
$ apt-get install docker-ce
$ usermod -aG docker $USER
Modify /etc/modules-load.d/modules.conf
aufs
vfs
Modify /etc/docker/daemon.json. This is needed because I am using ZFS storage. If you are using LVM, I would imagine overlay2 would work just fine.
{
"storage-driver": "vfs"
}
Reload systemctl daemon and start docker
$ systemctl daemon-reload && systemctl start docker
Setup Docker network See official Docker documentation on how to configure your network
Start docker-compose. If you receive HTTP errors, restart docker and run the command again. You may need to adjust your timeouts appropriately.
$ docker-compose up -d
Additional parameters for lcx 1xx.conf in /opt/pve/lxc/
lxc.cgroup.devices.allow: a
lxc.mount.auto: proc:rw sys:rw
lxc.cap.drop:
features: nesting=1
Configure mountpoints (optional)
mp0: /zstorage/media,mp=/zstorage/media
mp1: /zstorage/home,mp=/zstorage/home
mp2: /zstorage/timemachine,mp=/zstorage/timemachine
