[BALUG-Admin] BALUG VM, dynamic DNS & (automatic) version control (added)

[Michael Paoli]

> From: "Michael Paoli" <Michael.Paoli@cal.berkeley.edu>
> To: BALUG-Talk <balug-talk@lists.balug.org>
> Subject: test DNS that returns SERVFAIL? ... ! :-)
> Date: Mon, 13 Apr 2020 03:14:35 -0700

> Ah yes, I'm quite starting to get used to and like/prefer dynamic DNS
> update.  Significantly more goof-resistant, and most of the time I don't
> even have to think about the zone serial number.  Which reminds me,
> I do still want to add some version "control" (tracking) ... driven via
> cron, so I'll at least have periodic snapshots of changes (since no
> longer using ye olde manual method & manual version control).  For
> more recent changes, and fine-grained history of changes, logs cover
> that quite well.  But for the longer historical record ... wee bit 'o
> gap presently to fill on that.

And now added.  Doesn't catch the "why", and doesn't catch
change-by-change, but automatic daily check-in of any changes,
"good enough" for my(/our?) purposes here, and have that now:
$ cat /etc/cron.d/local-bind-master-auto-rcs
0 10 * * * root exec >>/dev/null 2>&1 && for zone in  
e.9.1.0.5.0.f.1.0.7.4.0.1.0.0.2.ip6.arpa berkeleylug.com sf-lug.com  
sflug.com sf-lug.net sflug.net balug.org berkeleylug.org sf-lug.org  
sflug.org; do rndc sync -clean "$zone" && rndc freeze "$zone" && {  
rcsdiff digtitalwitness.org || { rcsdiffrc="$?"; [ "$rcsdiffrc" -ne 1  
] || { ci -l -d -M -m'checking in change(s)' "$zone"; }; }; rndc thaw  
"$zone"; }; done; :
$ hostname
balug-sf-lug-v2.balug.org
$ ls -l /etc/localtime
lrwxrwxrwx 1 root root 27 Apr 19 09:56 /etc/localtime ->  
/usr/share/zoneinfo/Etc/UTC
$