Automating forward and reverse DNS records for all L3 interfaces directly from NPM

Spent some time over the past few months looking at another aspect of network automation: DNS records management.

I started out looking to clean up our stale BIND9 zones, and ended up with a script that mostly automates the whole process, reading node/interface data from the SolarWinds NPM API and spitting out BIND9 zone/config files for both forward and reverse lookup zones.

My pings and traceroutes are much prettier now :)

$ ping example-router PING example-router-1g-te-1-1-8.example.net (10.250.20.66) 56(84) bytes of data. 64 bytes from example-router-1g-te-1-1-8.example.net (10.250.20.66): icmp_seq=1 ttl=252 time=1.69 ms 64 bytes from example-router-1g-te-1-1-8.example.net (10.250.20.66): icmp_seq=2 ttl=252 time=2.03 ms 64 bytes from example-router-1g-te-1-1-8.example.net (10.250.20.66): icmp_seq=3 ttl=252 time=1.92 ms 64 bytes from example-router-1g-te-1-1-8.example.net (10.250.20.66): icmp_seq=4 ttl=252 time=1.86 ms [austind@prod ~]$ traceroute 8.8.8.8 traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets 1 idf4-1g-v-10.example.net (172.16.32.1) 0.484 ms 0.547 ms 0.593 ms 2 agg1-10g-eth-2-48.example.net (10.250.20.6) 0.444 ms 0.549 ms 0.666 ms 3 pa-10g-eth-1-22.example.net (10.250.34.34) 0.616 ms 0.592 ms 0.578 ms 4 border-in-40g-hu-1-0-49.example.net (205.155.219.50) 0.872 ms 0.855 ms 0.779 ms 5 border-out-1-te-0-0-2-2.example.net (205.155.198.240) 1.504 ms 1.673 ms 1.650 ms 6 sac-agg2--but-coe-1-10g.cenic.net (137.164.50.236) 7.160 ms 6.515 ms 5.411 ms 7 oak-agg4--sac-agg4--100ge.cenic.net (137.164.46.34) 6.554 ms 7.099 ms 7.045 ms 8 74.125.48.172 (74.125.48.172) 7.528 ms 7.539 ms 7.516 ms 9 108.170.242.225 (108.170.242.225) 8.148 ms 108.170.242.81 (108.170.242.81) 7.972 ms 108.170.243.1 (108.170.243.1) 9.379 ms 10 209.85.240.169 (209.85.240.169) 7.957 ms 209.85.240.175 (209.85.240.175) 8.027 ms 108.170.232.69 (108.170.232.69) 8.049 ms 11 google-public-dns-a.google.com (8.8.8.8) 7.728 ms 7.787 ms 7.718 ms 

The codebase is premature and built around our environment (SolarWinds & BIND9), but I thought I'd share in case it's helpful.

github