I have an internal DNS setup setup in my AWS VPC network, I just created an internal load balancer and added a CNAME record to this load balancer, but it's not working.
DNS CNAME entry:
db1 IN CNAME internal-DB1-1579653487.us-east-1.elb.amazonaws.com.
nslookup looks good:
epf-mac:~ erico$ nslookup -q=CNAME db1 Server: 10.0.200.4 Address: 10.0.200.4#53 db1.example.com canonical name = internal-DB1-1579653487.us-east-1.elb.amazonaws.com.
Load balancer hostname points to 2 IPs (Load Balancer working in two subnets).
epf-mac:~ erico$ nslookup internal-DB1-1579653487.us-east-1.elb.amazonaws.com. Server: 10.0.200.4 Address: 10.0.200.4#53 Non-authoritative answer: Name: internal-DB1-1579653487.us-east-1.elb.amazonaws.com Address: 10.0.211.228 Name: internal-DB1-1579653487.us-east-1.elb.amazonaws.com Address: 10.0.200.65
But actual name doesn't work:
epf-mac:~ erico$ ping db1 ping: cannot resolve db1: Unknown host epf-mac:~ erico$ dig db1 ; <<>> DiG 9.8.3-P1 <<>> db1 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 39452 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;db1. IN A ;; AUTHORITY SECTION: . 9456 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2014100901 1800 900 604800 86400 ;; Query time: 165 msec ;; SERVER: 10.0.200.4#53(10.0.200.4) ;; WHEN: Thu Oct 9 21:10:30 2014 ;; MSG SIZE rcvd: 96
----- EDIT (FIXED) -----
I don't know exactly what it was, but the entry started working without make any additional changes, some DNS caching probably.