[2.4b1] DNS triggers not working

[Andres Rodriguez]

It seems that DNS triggers are no longer working. I set two machines to deploy, and DNS was never updated. I restarted maas-regiond and the entries were updated in bind. Logs would normally show when DNS triggers were updated, but in this case they dont anymore:

==> /var/log/maas/maas.log <==
Apr 4 22:51:50 localhost maas.node: [info] node02: Status transition from ALLOCATED to DEPLOYING
Apr 4 22:51:50 localhost maas.node: [info] node01: Status transition from ALLOCATED to DEPLOYING
Apr 4 22:51:50 localhost maas.power: [info] Changing power state (on) of node: node02 (67t43n)
Apr 4 22:51:50 localhost maas.power: [info] Changing power state (on) of node: node01 (wecac3)

==> /var/log/maas/regiond.log <==
2018-04-04 22:51:51 regiond: [info] 192.168.1.73 POST /ping HTTP/1.1 --> 404 NOT_FOUND (referrer: -; agent: PycURL/7.43.0.1 libcurl/7.58.0 GnuTLS/3.5.18 zlib/1.2.11 libidn2/2.0.4 libpsl/0.19.1 (+libidn2/2.0.4) nghttp2/1.30.0 librtmp/2.3)
2018-04-04 22:52:10 regiond: [info] 192.168.1.13 GET /MAAS/rpc/ HTTP/1.1 --> 200 OK (referrer: -; agent: provisioningserver.rpc.clusterservice.ClusterClientService)
2018-04-04 22:52:16 maasserver.rpc.leases: [info] Lease update: commit for 10.90.90.178 on b8:ae:ed:7d:17:d2 at 2018-04-04 22:52:16 (lease time: 30s)

==> /var/log/maas/maas.log <==
Apr 4 22:52:17 localhost maas.power: [info] Changed power state (on) of node: node01 (wecac3)
Apr 4 22:52:17 localhost maas.power: [info] Changed power state (on) of node: node02 (67t43n)

==> /var/log/maas/regiond.log <==
2018-04-04 22:52:18 maasserver.rpc.leases: [info] Lease update: commit for 10.90.90.179 on b8:ae:ed:7d:6:2d at 2018-04-04 22:52:18 (lease time: 30s)
2018-04-04 22:52:21 regiond: [info] 192.168.1.73 POST /ping HTTP/1.1 --> 404 NOT_FOUND (referrer: -; agent: PycURL/7.43.0.1 libcurl/7.58.0 GnuTLS/3.5.18 zlib/1.2.11 libidn2/2.0.4 libpsl/0.19.1 (+libidn2/2.0.4) nghttp2/1.30.0 librtmp/2.3)
2018-04-04 22:52:32 regiond: [info] 192.168.1.73 GET /MAAS/static/partials/subnet-details.html?v=2.4.0~beta1(6799-g391e5f16d-0ubuntu1) HTTP/1.1 --> 200 OK (referrer: http://192.168.1.13:5240/MAAS/; agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.75 Safari/537.36)
2018-04-04 22:52:40 regiond: [info] 192.168.1.13 GET /MAAS/rpc/ HTTP/1.1 --> 200 OK (referrer: -; agent: provisioningserver.rpc.clusterservice.ClusterClientService)
2018-04-04 22:52:51 regiond: [info] 192.168.1.73 POST /ping HTTP/1.1 --> 404 NOT_FOUND (referrer: -; agent: PycURL/7.43.0.1 libcurl/7.58.0 GnuTLS/3.5.18 zlib/1.2.11 libidn2/2.0.4 libpsl/0.19.1 (+libidn2/2.0.4) nghttp2/1.30.0 librtmp/2.3)
2018-04-04 22:52:57 maasserver.rpc.leases: [info] Lease update: commit for 10.90.90.178 on b8:ae:ed:7d:17:d2 at 2018-04-04 22:52:57 (lease time: 600s) (hostname: node01)
2018-04-04 22:52:58 maasserver.rpc.leases: [info] Lease update: commit for 10.90.90.179 on b8:ae:ed:7d:6:2d at 2018-04-04 22:52:58 (lease time: 600s) (hostname: node02)