====== Docker Configuration via /etc/docker/daemon.json ======
===== Prevent Creation of dynamic iptables rules, disable userland proxy =====
<code>
{
        "iptables": false,
        "ip-masq": false,
        "userland-proxy": false
}
</code>

===== Create iptables rules manually =====

<code>
iptables -A FORWARD -s $dockernetwork -m tcp -p tcp -m conntrack --ctstate NEW -j ACCEPT

</code>
===== Configure DNS server=====
<code>
{
        "dns": ["192.168.100.254"]
}
</code>
===== Activate IPv6 =====
<code>
{
    "ipv6": true,
    "fixed-cidr-v6": "fd00:fd00::/64"
}
</code>
Just "ipv6" is not enough - docker daemon will not start with an error message about non-overlapping IPv6 network.

{{tag>kb linux docker}}