Added fail2ban, though not sure its configured correctly yet

docker/rootfs/fail2ban/action.d/nftables.conf

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+## Version 2022/08/06
+# Fail2Ban configuration file
+#
+# Author: Daniel Black
+# Author: Cyril Jaquier
+# Modified: Yaroslav O. Halchenko <debian@onerussian.com>
+# 			made active on all ports from original iptables.conf
+# Modified: Alexander Belykh <albel727@ngs.ru>
+#                       adapted for nftables
+#
+# This is a included configuration file and includes the definitions for the nftables
+# used in all nftables based actions by default.
+#
+# The user can override the defaults in nftables-common.local
+# Example: redirect flow to honeypot
+#
+# [Init]
+# table_family = ip
+# chain_type = nat
+# chain_hook = prerouting
+# chain_priority = -50
+# blocktype = counter redirect to 2222
+
+[INCLUDES]
+
+after = nftables-common.local
+
+[Definition]
+
+# Option:  type
+# Notes.:  type of the action.
+# Values:  [ multiport | allports ]  Default: multiport
+#
+type = multiport
+
+rule_match-custom =
+rule_match-allports = meta l4proto \{ <protocol> \}
+rule_match-multiport = $proto dport \{ $(echo '<port>' | sed s/:/-/g) \}
+match = <rule_match-<type>>
+
+# Option:  rule_stat
+# Notes.:  statement for nftables filter rule.
+#          leaving it empty will block all (include udp and icmp)
+# Values:  nftables statement
+#
+rule_stat = %(match)s <addr_family> saddr @<addr_set> <blocktype>
+
+# optional interator over protocol's:
+_nft_for_proto-custom-iter =
+_nft_for_proto-custom-done =
+_nft_for_proto-allports-iter =
+_nft_for_proto-allports-done =
+_nft_for_proto-multiport-iter = for proto in $(echo '<protocol>' | sed 's/,/ /g'); do
+_nft_for_proto-multiport-done = done
+
+_nft_list = <nftables> -a list chain <table_family> <table> <chain>
+_nft_get_handle_id = grep -oP '@<addr_set>\s+.*\s+\Khandle\s+(\d+)$'
+
+_nft_add_set = <nftables> add set <table_family> <table> <addr_set> \{ type <addr_type>\; \}
+              <_nft_for_proto-<type>-iter>
+              <nftables> add rule <table_family> <table> <chain> %(rule_stat)s
+              <_nft_for_proto-<type>-done>
+_nft_del_set = { %(_nft_list)s | %(_nft_get_handle_id)s; } | while read -r hdl; do
+               <nftables> delete rule <table_family> <table> <chain> $hdl; done
+              <nftables> delete set <table_family> <table> <addr_set>
+
+# Option:  _nft_shutdown_table
+# Notes.:  command executed after the stop in order to delete table (it checks that no sets are available):
+# Values:  CMD
+#
+_nft_shutdown_table = { <nftables> list table <table_family> <table> | grep -qP '^\s+set\s+'; } || {
+                        <nftables> delete table <table_family> <table>
+                      }
+
+# Option:  actionstart
+# Notes.:  command executed on demand at the first ban (or at the start of Fail2Ban if actionstart_on_demand is set to false).
+# Values:  CMD
+#
+actionstart = <nftables> add table <table_family> <table>
+              <nftables> -- add chain <table_family> <table> <chain> \{ type <chain_type> hook <chain_hook> priority <chain_priority> \; \}
+              %(_nft_add_set)s
+
+# Option:  actionflush
+# Notes.:  command executed once to flush IPS, by shutdown (resp. by stop of the jail or this action);
+#          uses `nft flush set ...` and as fallback (e. g. unsupported) recreates the set (with references)
+# Values:  CMD
+#
+actionflush = { <nftables> flush set <table_family> <table> <addr_set> 2> /dev/null; } || {
+              %(_nft_del_set)s
+              %(_nft_add_set)s
+              }
+
+# Option:  actionstop
+# Notes.:  command executed at the stop of jail (or at the end of Fail2Ban)
+# Values:  CMD
+#
+actionstop = %(_nft_del_set)s
+             <_nft_shutdown_table>
+
+# Option:  actioncheck
+# Notes.:  command executed once before each actionban command
+# Values:  CMD
+#
+actioncheck = <nftables> list chain <table_family> <table> <chain> | grep -q '@<addr_set>[ \t]'
+
+# Option:  actionban
+# Notes.:  command executed when banning an IP. Take care that the
+#          command is executed with Fail2Ban user rights.
+# Tags:    See jail.conf(5) man page
+# Values:  CMD
+#
+actionban = <nftables> add element <table_family> <table> <addr_set> \{ <ip> \}
+
+# Option:  actionunban
+# Notes.:  command executed when unbanning an IP. Take care that the
+#          command is executed with Fail2Ban user rights.
+# Tags:    See jail.conf(5) man page
+# Values:  CMD
+#
+actionunban = <nftables> delete element <table_family> <table> <addr_set> \{ <ip> \}
+
+[Init]
+
+# Option:  table
+# Notes.:  main table to store chain and sets (automatically created on demand)
+# Values:  STRING  Default: f2b-table
+table = f2b-table
+
+# Option:  table_family
+# Notes.:  address family to work in
+# Values:  [ip | ip6 | inet]  Default: inet
+table_family = inet
+
+# Option:  chain
+# Notes.:  main chain to store rules
+# Values:  STRING  Default: f2b-chain
+chain = f2b-chain
+
+# Option:  chain_type
+# Notes.:  refers to the kind of chain to be created
+# Values:  [filter | route | nat]  Default: filter
+#
+chain_type = filter
+
+# Option:  chain_hook
+# Notes.:  refers to the kind of chain to be created
+# Values:  [ prerouting | input | forward | output | postrouting ]  Default: input
+#
+chain_hook = input
+
+# Option:  chain_priority
+# Notes.:  priority in the chain.
+# Values:  NUMBER  Default: -1
+#
+chain_priority = -1
+
+# Option:  addr_type
+# Notes.:  address type to work with
+# Values:  [ipv4_addr | ipv6_addr]  Default: ipv4_addr
+#
+addr_type = ipv4_addr
+
+# Default name of the filtering set
+#
+name = default
+
+# Option:  port
+# Notes.:  specifies port to monitor
+# Values:  [ NUM | STRING ]  Default:
+#
+port = ssh
+
+# Option:  protocol
+# Notes.:  internally used by config reader for interpolations.
+# Values:  [ tcp | udp ] Default: tcp
+#
+protocol = tcp
+
+# Option:  blocktype
+# Note:    This is what the action does with rules. This can be any jump target
+#          as per the nftables man page (section 8). Common values are drop,
+#          reject, reject with icmpx type host-unreachable, redirect to 2222
+# Values:  STRING
+blocktype = reject
+
+# Option:  nftables
+# Notes.:  Actual command to be executed, including common to all calls options
+# Values:  STRING
+nftables = nft
+
+# Option: addr_set
+# Notes.: The name of the nft set used to store banned addresses
+# Values: STRING
+addr_set = addr-set-<name>
+
+# Option: addr_family
+# Notes.: The family of the banned addresses
+# Values: [ ip | ip6 ]
+addr_family = ip
+
+[Init?family=inet6]
+addr_family = ip6
+addr_type = ipv6_addr
+addr_set = addr6-set-<name>