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* Default to upstream to self This is a backwards incompatible change. This is a massive (cleanup) PR where we default to resolving external names by the coredns process itself, instead of directly forwarding them to some upstream. This ignores any arguments `upstream` may have had and makes it depend on proxy/forward configuration in the Corefile. This allows resolved upstream names to be cached and we have better healthchecking of the upstreams. It also means there is only one way to resolve names, by either using the proxy or forward plugin. The proxy/forward lookup.go functions have been removed. This also lessen the dependency on proxy, meaning deprecating proxy will become easier. Some tests have been removed as well, or moved to the top-level test directory as they now require a full coredns process instead of just the plugin. For the etcd plugin, the entire StubZone resolving is *dropped*! This was a hacky (but working) solution to say the least. If someone cares deeply it can be brought back (maybe)? The pkg/upstream is now very small and almost does nothing. Also the New() function was changed to return a pointer to upstream.Upstream. It also returns only one parameter, so any stragglers using it will encounter a compile error. All documentation has been adapted. This affected the following plugins: * etcd * file * auto * secondary * federation * template * route53 A followup PR will make any upstream directives with arguments an error, right now they are ignored. Signed-off-by: Miek Gieben <miek@miek.nl> * Fix etcd build - probably still fails unit test Signed-off-by: Miek Gieben <miek@miek.nl> * Slightly smarter lookup check in upstream Signed-off-by: Miek Gieben <miek@miek.nl> * Compilez Signed-off-by: Miek Gieben <miek@miek.nl>
80 lines
2.7 KiB
Markdown
80 lines
2.7 KiB
Markdown
# auto
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## Name
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*auto* - enables serving zone data from an RFC 1035-style master file, which is automatically picked up from disk.
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## Description
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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. using DNSSEC) correct DNSSEC answers
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are returned. Only NSEC is supported! If you use this setup *you* are responsible for re-signing the
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zonefile. New or changed zones 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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reload DURATION
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no_reload
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upstream
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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 specified **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, e.g. `{1}` is the
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first match, `{2}` is the second. The default is: `db\.(.*) {1}` i.e. 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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* `reload` interval to perform reload of zone if SOA version changes. Default is one minute.
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Value of `0` means to not scan for changes and reload. eg. `30s` checks zonefile every 30 seconds
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and reloads zone when serial changes.
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* `no_reload` deprecated. Sets reload to 0.
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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. CoreDNS will resolve CNAMEs against itself.
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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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~~~ corefile
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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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~~~
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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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