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78 lines
1.8 KiB
Groff
78 lines
1.8 KiB
Groff
.\" Generated by Mmark Markdown Processer - mmark.miek.nl
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.TH "COREDNS-READY" 7 "December 2019" "CoreDNS" "CoreDNS Plugins"
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.SH "NAME"
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.PP
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\fIready\fP - enables a readiness check HTTP endpoint.
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.SH "DESCRIPTION"
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.PP
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By enabling \fIready\fP an HTTP endpoint on port 8181 will return 200 OK, when all plugins that are able
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to signal readiness have done so. If some are not ready yet the endpoint will return a 503 with the
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body containing the list of plugins that are not ready. Once a plugin has signaled it is ready it
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will not be queried again.
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.PP
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Each Server Block that enables the \fIready\fP plugin will have the plugins \fIin that server block\fP
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report readiness into the /ready endpoint that runs on the same port. This also means that the
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\fIsame\fP plugin with different configurations (in potentially \fIdifferent\fP Server Blocks) will have
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their readiness reported as the union of their respective readinesses.
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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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ready [ADDRESS]
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.fi
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.RE
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.PP
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\fIready\fP optionally takes an address; the default is \fB\fC:8181\fR. The path is fixed to \fB\fC/ready\fR. The
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readiness endpoint returns a 200 response code and the word "OK" when this server is ready. It
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returns a 503 otherwise \fIand\fP the list of plugins that are not ready.
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.SH "PLUGINS"
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.PP
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Any plugin wanting to signal readiness will need to implement the \fB\fCready.Readiness\fR interface by
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implementing a method \fB\fCReady() bool\fR that returns true when the plugin is ready and false otherwise.
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.SH "EXAMPLES"
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.PP
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Let \fIready\fP report readiness for both the \fB\fC.\fR and \fB\fCexample.org\fR servers (assuming the \fIwhois\fP
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plugin also exports readiness):
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.PP
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.RS
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.nf
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\&. {
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ready
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erratic
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}
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example.org {
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ready
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whoami
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}
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.fi
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.RE
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.PP
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Run \fIready\fP on a different port.
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.PP
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.RS
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.nf
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\&. {
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ready localhost:8091
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}
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.fi
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.RE
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