Coredns using Docker

Corefile

home.arpa {
    file config/home.arpa
    prometheus     # enable metrics
    errors         # show errors
    log            # enable query logs
}

Docker.sh

#Start coredns instance using docker. Bind to DNS ports, map /opt/coredns to /config in container and use it's Corefile
docker run --name coredns --restart=always -d -p 53:53 -p 53:53/udp -v /opt/coredns:/config coredns/coredns -conf /config/Corefile
#View log files of container (use logs -f to follow logs)
docker logs coredns

#Testing (non-persistant container that will be deleted when stopped). Use docker ps to see it's container name
docker run --rm coredns/coredns --help #See command line options (there is no sh or bin in this container)
docker kill --signal="SIGUSR1" coredns #send signal to reload if config is changed (need to use auto plugin to auto reload)

home.arpa

$ORIGIN home.arpa.
@	3600 IN	SOA sns.dns.icann.org. noc.dns.icann.org. (
				2017042745 ; serial
				7200       ; refresh (2 hours)
				3600       ; retry (1 hour)
				1209600    ; expire (2 weeks)
				3600       ; minimum (1 hour)
				)

testrecord     IN A     127.0.0.1
internal.home.arpa.  IN  DNAME example.com.

zzz_output.sh

$ dig +additional www.internal.home.arpa

; <<>> DiG 9.10.3-P4-Ubuntu <<>> www.internal.home.arpa
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10972
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;www.internal.home.arpa.	IN	A

;; ANSWER SECTION:
internal.home.arpa.	3600	IN	DNAME   example.com.
www.internal.home.arpa. 3600	IN	CNAME	www.example.com.
www.example.com.	0	IN	A	93.184.216.34

;; Query time: 6 msec
;; SERVER: 127.0.1.1#53(127.0.1.1)
;; WHEN: Sun Aug 19 21:38:24 MDT 2018
;; MSG SIZE  rcvd: 150