Hi All, I have the following DNS topology (In my Openstack deployment): VM --> DNSMASQ --> external DNS server domain name= shiftstack.com, and Dnsmasq 2.76 is used at this Openstack deployment.
I run the following test: 1. Define CNAME record at external DNS server ostest-etcd-5.shiftstack.com. IN CNAME ostest-master-2 2. while 'ostest-master-2' is defined in --addn-hosts at Dnsmasq: the relevant entry: 10.0.1.214 ostest-master-2.shiftstack.com. ostest-master-2 3. next step, I tried to resolve 'ostest-etcd-5.shiftstack.com.' from the VM. I expected that dig ostest-etcd-5.shiftstack.com. should be replied with the ostest-master-2 IP (10.0.1.214). Actual behavior: When I run dig (see 1) just for type A, Dnsmasq replied only with the CNAME entry and doesn't return ostest-master-2 IP address. But when I run dig (see 2) for types AAAA and A (at this order), I can see that Dnsmasq resolves ostest-master-2 IP address as expected. It seems to me like an issue of CNAME caching at Dnsmasq (2.76), Is it a known issue? Thanks in advance Yossi [1] $ dig +noedns ostest-etcd-5.shiftstack.com. A ; <<>> DiG 9.9.4-RedHat-9.9.4-72.el7 <<>> +noedns ostest-etcd-5.shiftstack.com. A ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13837 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;ostest-etcd-5.shiftstack.com. IN A ;; ANSWER SECTION: ostest-etcd-5.shiftstack.com. 3600 IN CNAME ostest-master-2.shiftstack.com. ;; Query time: 2 msec ;; SERVER: 10.0.0.2#53(10.0.0.2) ;; WHEN: Sun Jan 20 09:52:48 UTC 2019 ;; MSG SIZE rcvd: 118 $ [2] $ dig +noedns ostest-etcd-5.shiftstack.com. AAAA ostest-etcd-5.shiftstack.com. A ; <<>> DiG 9.9.4-RedHat-9.9.4-72.el7 <<>> +noedns ostest-etcd-5.shiftstack.com. AAAA ostest-etcd-5.shiftstack.com. A ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63573 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;ostest-etcd-5.shiftstack.com. IN AAAA ;; ANSWER SECTION: ostest-etcd-5.shiftstack.com. 3600 IN CNAME ostest-master-2.shiftstack.com. ;; Query time: 3 msec ;; SERVER: 10.0.0.2#53(10.0.0.2) ;; WHEN: Sun Jan 20 09:53:59 UTC 2019 ;; MSG SIZE rcvd: 118 ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15671 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;ostest-etcd-5.shiftstack.com. IN A ;; ANSWER SECTION: ostest-etcd-5.shiftstack.com. 3600 IN CNAME ostest-master-2.shiftstack.com. ostest-master-2.shiftstack.com. 0 IN A 10.0.1.214 ;; Query time: 0 msec ;; SERVER: 10.0.0.2#53(10.0.0.2) ;; WHEN: Sun Jan 20 09:53:59 UTC 2019 ;; MSG SIZE rcvd: 106 $
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