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36c7aa6437
* 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
73 lines
2.6 KiB
Markdown
73 lines
2.6 KiB
Markdown
# auto
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*auto* enables serving zone data from an RFC 1035-style master file which is automatically picked
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up from disk.
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The *auto* plugin is used for an "old-style" DNS server. It serves from a preloaded file that exists
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on disk. If the zone file contains signatures (i.e. is signed, i.e. DNSSEC) correct DNSSEC answers
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are returned. Only NSEC is supported! If you use this setup *you* are responsible for resigning the
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zonefile. New zones or changed zone are automatically picked up from disk.
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## Syntax
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~~~
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auto [ZONES...] {
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directory DIR [REGEXP ORIGIN_TEMPLATE [TIMEOUT]]
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no_reload
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upstream ADDRESS...
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}
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~~~
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**ZONES** zones it should be authoritative for. If empty, the zones from the configuration block
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are used.
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* `directory` loads zones from the speficied **DIR**. If a file name matches **REGEXP** it will be
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used to extract the origin. **ORIGIN_TEMPLATE** will be used as a template for the origin. Strings
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like `{<number>}` are replaced with the respective matches in the file name, i.e. `{1}` is the
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first match, `{2}` is the second, etc.. The default is: `db\.(.*) {1}` e.g. from a file with the
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name `db.example.com`, the extracted origin will be `example.com`. **TIMEOUT** specifies how often
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CoreDNS should scan the directory, the default is every 60 seconds. This value is in seconds.
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The minimum value is 1 second.
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* `no_reload` by default CoreDNS will try to reload a zone every minute and reloads if the
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SOA's serial has changed. This option disables that behavior.
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* `upstream` defines upstream resolvers to be used resolve external names found (think CNAMEs)
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pointing to external names. **ADDRESS** can be an IP address, and IP:port or a string pointing to
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a file that is structured as /etc/resolv.conf.
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All directives from the *file* plugin are supported. Note that *auto* will load all zones found,
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even though the directive might only receive queries for a specific zone. I.e:
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~~~
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auto example.org {
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directory /etc/coredns/zones
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}
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~~~
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Will happily pick up a zone for `example.COM`, except it will never be queried, because the *auto*
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directive only is authoritative for `example.ORG`.
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## Examples
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Load `org` domains from `/etc/coredns/zones/org` and allow transfers to the internet, but send
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notifies to 10.240.1.1
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~~~ corefile
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. {
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auto org {
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directory /etc/coredns/zones/org
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transfer to *
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transfer to 10.240.1.1
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}
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}
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~~~
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Load `org` domains from `/etc/coredns/zones/org` and looks for file names as `www.db.example.org`,
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where `example.org` is the origin. Scan every 45 seconds.
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~~~ corefile
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org {
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auto {
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directory /etc/coredns/zones/org www\.db\.(.*) {1} 45
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}
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}
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~~~
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