Comment 4 for bug 1765405

In the existing deployment, the DNS config in the LXD container (nova-cloud-controller) looks as follows:

ubuntu@juju-d1a6e2-2-lxd-2:~$ cat /etc/resolv.conf │······························································
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) │······························································
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN │······························································
nameserver 10.245.168.6 │······························································
search maas

in the 'broken' one, it is using a local resolver and therefore presumably doesnt forward queries to the MAAS dns server which would respond to the hostname of the nova-compute machine.

/etc/resolv.conf on broken instance only contains:
nameserver 127.0.0.53

---

host and ping both fail to resolve the hostname, but dig succeeds partially:

ubuntu@juju-6406ff-2-lxd-2:/etc$ host node-jaeger
Host node-jaeger not found: 2(SERVFAIL)
ubuntu@juju-6406ff-2-lxd-2:/etc$ ping node-jaeger
ping: node-jaeger: Temporary failure in name resolution
ubuntu@juju-6406ff-2-lxd-2:/etc$ dig node-jaeger

; <<>> DiG 9.11.3-1ubuntu1-Ubuntu <<>> node-jaeger
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 13450
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;node-jaeger. IN A

;; Query time: 0 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Thu May 17 19:49:05 UTC 2018
;; MSG SIZE rcvd: 40

dig node-jaeger.maas succeeds:

ubuntu@juju-6406ff-2-lxd-2:/etc$ dig node-jaeger.maas

; <<>> DiG 9.11.3-1ubuntu1-Ubuntu <<>> node-jaeger.maas
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58641
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;node-jaeger.maas. IN A

;; ANSWER SECTION:
node-jaeger.maas. 30 IN A 10.245.168.44

;; Query time: 0 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Thu May 17 19:50:56 UTC 2018
;; MSG SIZE rcvd: 61