{{tag>linux docker DNS bind9}}
======Docker - DNS Server======
[[https://www.hostinger.com/tutorials/what-is-dns|What Is DNS and How Does It Work – A Comprehensive Guide]]\\
I have been using Bind9 as my home LAN DNS for the past few years. I originally operated it on bare metal on my home router computer.  In mid 2023 I successfully moved my Bind9 primary instance to my main home server in a container and created a slave instance in a container running on my home router computer.  I created a Docker Bind9 Image using base Docker Alpine Linux images, with S6 init system.  

The main router must be set to forward packets!
The ability to forward packets must be set / allowed, edit or add the following parameters in ''sudo vim /etc/sysctl.conf'':
  *net.ipv4.ip_forward = 1
  *net.ipv4.conf.all.proxy_arp = 1
  * ''sudo sysctl net.ipv6.conf.all.forwarding=1'' similar for ipv6 
After applying these changes reboot or apply setting using ''sudo sysctl -p /etc/sysctl.conf''

  *''/usr/sbin/named -f -4'' to start the isc-bind9 application called named, 
    *''-f'' to run in foreground
    *''-4'' to run ipv4 only
  *''rndc stop'' to stop named  <fc #ff0000>- need to implement this in S6</fc>
  *''rndc reload'' to reload the named configuration files
  *''named-checkconf /etc/bind/named.conf''
  *''named-checkzone kptree.net /etc/bind/db.kptree.net''
  *''named-checkzone 1.168.192.in-addr.arpa /etc/bind/db.1.168.192''
  *''cat /log/named/bind.log'' to list bind log file
  *From [[https://serverfault.com/questions/401024/listing-all-zones-loaded-in-bind|Listing all zones loaded in BIND]]
    *''rndc dumpdb -zones''
    *''cat /var/bind/named_dump.db'' to see the database dump
    *''named-checkconf -l'' does this option still exist?
    *''named-checkconf -p'' for a flatened uncomment listing of the configuration files

I have setup a primary DNS server and secondary slave DNS server.  
  *The primary DNS server runs on my main home server, it is the master 
  *The secondary DNS server runs on my router, it is set up as a slave server from the primary server and reads the zone files from the master when available.

====References====
  *[[https://askubuntu.com/questions/311053/how-to-make-ip-forwarding-permanent|How to make IP forwarding permanent?]]

=====References=====
   *KPTree.net's bare metal implementation of [[linux_router:dns_dhcp|dns - dhcp]], based upon ISC Bind9 and DHCP on Debian 10 <fs xx-small>(was originally Ubuntu)</fs>.
   *[[https://www.zytrax.com/books/dns/|DNS for Rocket Scientists]]
   *[[https://hub.docker.com/r/mjkaye/bind9-alpine|mjkaye/bind9-alpine]]
   *[[https://kb.isc.org/docs/aa-00768|Getting started with BIND - how to build and run named with a basic recursive configuration]]
   *[[https://www.digitalocean.com/community/tutorials/how-to-configure-bind-as-a-caching-or-forwarding-dns-server-on-ubuntu-16-04|How To Configure Bind as a Caching or Forwarding DNS Server on Ubuntu 16.04]]
   *[[https://stackoverflow.com/questions/11153958/how-to-enable-named-bind-dns-full-logging|How to enable named/bind/DNS full logging? [closed]]]
   *[[https://á.se/dnssec-bind9-alpine/|dnssec, Bind9 on Alpine]]
   *[[https://www.isc.org/bind/|ISC Bind9]]
   *[[https://hub.docker.com/r/internetsystemsconsortium/bind9|Github internetsystemsconsortium/bind9]]
   *[[https://serverspace.us/support/help/bind9-as-a-secondary-dns-server-on-ubuntu/|How to Configure BIND9 as a Secondary DNS Server on Ubuntu 20.04]]
   *[[https://askubuntu.com/questions/152593/command-line-to-list-dns-servers-used-by-my-system|Command-line to list DNS servers used by my system]]
   *[[https://computingforgeeks.com/configure-slave-bind-dns-server-on-ubuntu/|Configure Slave BIND DNS Server on Ubuntu 22.04|20.04]]

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