docker2.saao.ac.za has no CNAME records.
Question and response
Question
dig docker2.saao.ac.za. NS
Answer
The response has no answer records.
Authority
saao.ac.za. 1800 SOA eva.ns.cloudflare.com. dns.cloudflare.com. 2397606288 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0