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#!/usr/sbin/nft -f
flush ruleset
# don't use inet instead of ip&ip6,
# because Docker doesn't support it, yet
# see https://maximilianehlers.com/blog/nftables-and-docker/ for more details
table ip filter {
chain INPUT {
type filter hook input priority 0;
policy drop;
# allow already established connections (e.g. initiated by this host)
ct state related,established accept
# allow ICMP
ip protocol icmp accept
# allow anything on localhost
iifname "lo" accept
# allow SSH for remote management
tcp dport 22 accept
## docker
# cluster management communications
tcp dport 2377 accept
# communication among nodes
tcp dport 7946 accept
udp dport 7946 accept
# overlay network traffic
udp dport 4789 accept
}
chain FORWARD {
type filter hook forward priority 0;
policy drop;
}
chain OUTPUT {
type filter hook output priority 0;
policy accept;
}
}
table ip6 filter {
chain INPUT {
type filter hook input priority 0;
policy drop;
# allow already established connections (e.g. initiated by this host)
ct state related,established accept
# allow ICMPv6
ip6 nexthdr icmpv6 accept
# allow anything on localhost
iifname "lo" accept
}
chain FORWARD {
type filter hook forward priority 0;
policy drop;
}
chain OUTPUT {
type filter hook output priority 0;
policy accept;
}
}