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Docker kernel modules on Gentoo

Load required modules at boot via /etc/local.d/modprobe.start (auto-generated as gentoo-local-modprobe.service):

modprobe tun
modprobe veth

modprobe br_netfilter
modprobe iptable_filter

modprobe nf_nat
modprobe iptable_nat
modprobe xt_nat

modprobe nf_conntrack
modprobe xt_conntrack

modprobe xt_MASQUERADE
modprobe xt_addrtype

Make Docker depend on module loading:

# /lib/systemd/system/docker.service
[Unit]
...
Requires=docker.socket gentoo-local-modprobe.service
...