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Install Bind9 DNS

Pull the BIND9 docker image before disabling built-in DNS server​

docker pull ubuntu/bind9:latest

Disable Ubuntu built-in DNS resolver​

  1. Stop the OS built-in DNS service service systemd-resolved stop
  2. Backup existing /etc/resolv.conf just for safety. mv /etc/resolv.conf /etc/resolv.conf.backup
  3. Disable the service from startup systemctl disable systemd-resolved
  4. Confirm if port 53 is free: sudo lsof -i :53 . this should return nothing.

Installation:​

  1. cd /epiclabs23/eh/eh-services/dns
  2. Start docker container:
docker run -d \
--name bind9 \
-p 53:53/udp \
-p 53:53/tcp \
-e TZ=Asia/Dhaka \
-e BIND9_USER=root \
-v /epiclabs23/eh/eh-services/dns/etc/bind:/etc/bind \
-v /epiclabs23/eh/eh-services/dns/var/cache/bind:/var/cache/bind \
-v /epiclabs23/eh/eh-services/dns/var/lib/bind:/var/lib/bind \
--restart=always \
ubuntu/bind9:latest
  1. Configure Your Local Machine to Use the DNS Server: vim /etc/resolv.conf then add following content
nameserver 127.0.0.1
nameserver 8.8.8.8
nameserver 45.125.222.158
search .
  1. Test DNS server:
dig @127.0.0.1 www.example.local

or

nslookup www.example.local 127.0.0.1

  1. Managing DNS server:
docker exec bind9 named-checkzone ehm23.com /etc/bind/zones/db.ehm23.com
docker exec bind9 named-checkzone 57.169.49.103.in-addr.arpa /etc/bind/zones/db.57.169.49.103
docker exec bind9 rndc reload
docker stop bind9
docker start bind9
docker logs bind9
  1. Settings, forward DNS etc are available in: ./etc/bind/named.conf.options

Adding a new zone file:​

  1. Copy the db.example.local file as template, make changes accordingly.
  2. For any subdomain add an 'A' entry on this very same file.
  3. Update named.conf.local with the new zone file.

Debug​

Start built-in DNS: service systemd-resolved start

Check status of built-in DNS: service systemd-resolved status

Enable the built-in DSN in startup systemctl enable systemd-resolved

Copy back the backed up config file: cp /etc/resolv.conf.backup /etc/resolv.conf