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plugin/{file,auto}: drop fsnotify (#1090)

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* plugin/{file,auto}: drop fsnotify

Reload every minute. This is more deterministic then fsnotify. Also
other thing cropped up: sharing zone files between zone; there is only
1 fsnotify event and we need to fan out the reload to all zone files.
This is a large rewrite (which could still be done), for now, poll the
zone file on disk.

Give serial no change a special error type so we can check for this.
Improve the logging for reloading:

2017/09/19 07:34:39 [INFO] Successfully reloaded zone "miek.nl." in "db.miek.nl" with serial 128263060
2017/09/19 07:34:45 [INFO] Successfully reloaded zone "miek.nl." in "db.miek.nl" with serial 128263059
2017/09/19 07:34:51 [INFO] Successfully reloaded zone "miek.nl." in "db.miek.nl" with serial 128263060

Fixes #1013

* typo
This commit is contained in:
Miek Gieben
2017-09-20 17:28:23 +01:00
committed by GitHub
parent cd5879f866
commit 36c7aa6437
6 changed files with 54 additions and 49 deletions
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7
plugin/file/README.md
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@@ -20,9 +20,6 @@ file DBFILE [ZONES...]
If you want to round robin A and AAAA responses look at the *loadbalance* plugin.
TSIG key configuration is TODO; directive format for transfer will probably be extended with
TSIG key information, something like `transfer out [ADDRESS...] key [NAME[:ALG]] [BASE64]`
~~~
file DBFILE [ZONES... ] {
transfer to ADDRESS...
@@ -35,8 +32,8 @@ file DBFILE [ZONES... ] {
the direction. **ADDRESS** must be denoted in CIDR notation (127.0.0.1/32 etc.) or just as plain
addresses. The special wildcard `*` means: the entire internet (only valid for 'transfer to').
When an address is specified a notify message will be send whenever the zone is reloaded.
* `no_reload` by default CoreDNS will reload a zone from disk whenever it detects a change to the
file. This option disables that behavior.
* `no_reload` by default CoreDNS will try to reload a zone every minute and reloads if the
SOA's serial has changed. This option disables that behavior.
* `upstream` defines upstream resolvers to be used resolve external names found (think CNAMEs)
pointing to external names. This is only really useful when CoreDNS is configured as a proxy, for
normal authoritative serving you don't need *or* want to use this. **ADDRESS** can be an IP