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176 lines
4.3 KiB
Groff
176 lines
4.3 KiB
Groff
.\" Generated by Mmark Markdown Processer - mmark.miek.nl
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.TH "COREDNS-HOSTS" 7 "March 2021" "CoreDNS" "CoreDNS Plugins"
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.SH "NAME"
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.PP
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\fIhosts\fP - enables serving zone data from a \fB\fC/etc/hosts\fR style file.
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.SH "DESCRIPTION"
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.PP
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The \fIhosts\fP plugin is useful for serving zones from a \fB\fC/etc/hosts\fR file. It serves from a preloaded
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file that exists on disk. It checks the file for changes and updates the zones accordingly. This
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plugin only supports A, AAAA, and PTR records. The hosts plugin can be used with readily
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available hosts files that block access to advertising servers.
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.PP
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The plugin reloads the content of the hosts file every 5 seconds. Upon reload, CoreDNS will use the
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new definitions. Should the file be deleted, any inlined content will continue to be served. When
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the file is restored, it will then again be used.
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.PP
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If you want to pass the request to the rest of the plugin chain if there is no match in the \fIhosts\fP
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plugin, you must specify the \fB\fCfallthrough\fR option.
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.PP
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This plugin can only be used once per Server Block.
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.SH "THE HOSTS FILE"
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.PP
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Commonly the entries are of the form \fB\fCIP_address canonical_hostname [aliases...]\fR as explained by
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the hosts(5) man page.
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.PP
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Examples:
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.PP
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.RS
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.nf
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127.0.0.1 localhost
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192.168.1.10 example.com example
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::1 localhost ip6\-localhost ip6\-loopback
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fdfc:a744:27b5:3b0e::1 example.com example
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.fi
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.RE
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.SS "PTR RECORDS"
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.PP
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PTR records for reverse lookups are generated automatically by CoreDNS (based on the hosts file
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entries) and cannot be created manually.
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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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hosts [FILE [ZONES...]] {
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[INLINE]
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ttl SECONDS
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no\_reverse
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reload DURATION
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fallthrough [ZONES...]
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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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\fBFILE\fP the hosts file to read and parse. If the path is relative the path from the \fIroot\fP
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plugin will be prepended to it. Defaults to /etc/hosts if omitted. We scan the file for changes
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every 5 seconds.
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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.
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.IP \(bu 4
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\fBINLINE\fP the hosts file contents inlined in Corefile. If there are any lines before fallthrough
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then all of them will be treated as the additional content for hosts file. The specified hosts
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file path will still be read but entries will be overridden.
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.IP \(bu 4
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\fB\fCttl\fR change the DNS TTL of the records generated (forward and reverse). The default is 3600 seconds (1 hour).
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.IP \(bu 4
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\fB\fCreload\fR change the period between each hostsfile reload. A time of zero seconds disables the
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feature. Examples of valid durations: "300ms", "1.5h" or "2h45m". See Go's
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time
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\[la]https://godoc.org/time\[ra]. package.
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.IP \(bu 4
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\fB\fCno_reverse\fR disable the automatic generation of the \fB\fCin-addr.arpa\fR or \fB\fCip6.arpa\fR entries for the hosts
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.IP \(bu 4
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\fB\fCfallthrough\fR If zone matches and no record can be generated, pass request to the next plugin.
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If \fB[ZONES...]\fP is omitted, then fallthrough happens for all zones for which the plugin
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is authoritative. If specific zones are listed (for example \fB\fCin-addr.arpa\fR and \fB\fCip6.arpa\fR), then only
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queries for those zones will be subject to fallthrough.
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.SH "METRICS"
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.PP
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If monitoring is enabled (via the \fIprometheus\fP plugin) then the following metrics are exported:
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.IP \(bu 4
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\fB\fCcoredns_hosts_entries{}\fR - The combined number of entries in hosts and Corefile.
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.IP \(bu 4
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\fB\fCcoredns_hosts_reload_timestamp_seconds{}\fR - The timestamp of the last reload of hosts file.
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.SH "EXAMPLES"
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.PP
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Load \fB\fC/etc/hosts\fR file.
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.PP
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.RS
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.nf
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\&. {
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hosts
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}
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.fi
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.RE
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.PP
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Load \fB\fCexample.hosts\fR file in the current directory.
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.PP
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.RS
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.nf
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\&. {
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hosts example.hosts
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}
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.fi
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.RE
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.PP
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Load example.hosts file and only serve example.org and example.net from it and fall through to the
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next plugin if query doesn't match.
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.PP
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.RS
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.nf
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\&. {
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hosts example.hosts example.org example.net {
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fallthrough
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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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Load hosts file inlined in Corefile.
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.PP
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.RS
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.nf
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example.hosts example.org {
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hosts {
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10.0.0.1 example.org
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fallthrough
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}
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whoami
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}
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.fi
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.RE
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.SH "SEE ALSO"
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.PP
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The form of the entries in the \fB\fC/etc/hosts\fR file are based on IETF RFC 952
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\[la]https://tools.ietf.org/html/rfc952\[ra] which was updated by IETF RFC 1123
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\[la]https://tools.ietf.org/html/rfc1123\[ra].
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