Poul-Henning Kamp wrote:
> In message <4b1f7fed.4020...@boerse-go.de>, Mark Plomer writes:
>
>> Hi,
>> is it possible to retrieve some more details about the current backend
>> status via the telnet interface?
>> A list of all backends with current status (up/down) would be very
>> helpful for monitoring.
>> For the beginning, it would be enough to have the count of backends and
>> the count of up-/down- backends
>> in the "stats" output.
>>
>
> There is an undocumented "debug.health" command you can try.
>
> Ideas for a final version of this are most welcom.
>
>
Brilliant. At the moment we tail the varnishlog, post process, and
write out to disk for further monitoring. Here's the PHP we're using:
#!/usr/local/bin/php
<?php
$p = popen('varnishlog -u -i Backend_health','r');
$health = array();
while (!feof($p)) {
$l = fgets($p);
if ($m = preg_match("/^.*Backend_health - ([^ ]+) [^ ]+ ([^ ]+)
/Uis", $l, $matches)) {
if ($matches[2] != $health[$matches[1]]) {
$health[$matches[1]] = $matches[2];
file_put_contents("/tmp/varnishbackendhealth",
print_r($health,true));
}
}
}
?>
Our monitoring then records "grep -c healthy /tmp/varnishbackendhealth"
However, it looks like we can now use the far simpler:
echo 'debug.health' | nc localhost 6082 |grep -c Healthy
So - thanks for the change!
Rob
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