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95 lines
1.8 KiB
Groff
95 lines
1.8 KiB
Groff
.\" Generated by Mmark Markdown Processer - mmark.miek.nl
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.TH "COREDNS-SECONDARY" 7 "April 2020" "CoreDNS" "CoreDNS Plugins"
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.SH "NAME"
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.PP
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\fIsecondary\fP - enables serving a zone retrieved from a primary server.
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.SH "DESCRIPTION"
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.PP
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With \fIsecondary\fP you can transfer (via AXFR) a zone from another server. The retrieved zone is
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\fInot committed\fP to disk (a violation of the RFC). This means restarting CoreDNS will cause it to
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retrieve all secondary zones.
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.SH "SYNTAX"
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.PP
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.RS
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.nf
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secondary [ZONES...]
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.fi
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.RE
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.IP \(bu 4
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\fBZONES\fP zones it should be authoritative for. If empty, the zones from the configuration block
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are used. Note that without a remote address to \fIget\fP the zone from, the above is not that useful.
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.PP
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A working syntax would be:
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.PP
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.RS
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.nf
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secondary [zones...] {
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transfer from ADDRESS
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transfer to ADDRESS
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}
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.fi
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.RE
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.IP \(bu 4
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\fB\fCtransfer from\fR specifies from which address to fetch the zone. It can be specified multiple times;
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if one does not work, another will be tried.
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.IP \(bu 4
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\fB\fCtransfer to\fR can be enabled to allow this secondary zone to be transferred again.
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.PP
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When a zone is due to be refreshed (Refresh timer fires) a random jitter of 5 seconds is
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applied, before fetching. In the case of retry this will be 2 seconds. If there are any errors
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during the transfer the transfer fails; this will be logged.
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.SH "EXAMPLES"
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.PP
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Transfer \fB\fCexample.org\fR from 10.0.1.1, and if that fails try 10.1.2.1.
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.PP
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.RS
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.nf
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example.org {
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secondary {
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transfer from 10.0.1.1
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transfer from 10.1.2.1
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}
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}
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.fi
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.RE
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.PP
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Or re-export the retrieved zone to other secondaries.
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.PP
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.RS
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.nf
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\&. {
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secondary example.net {
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transfer from 10.1.2.1
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transfer to *
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}
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}
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.fi
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.RE
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.SH "BUGS"
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.PP
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Only AXFR is supported and the retrieved zone is not committed to disk.
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