Varnish Health check

[Guillaume Quintard]

Your backend is returning a 400, most probably because there's no host
header in your probe.

-- 
Guillaume Quintard


On Fri, Feb 19, 2021 at 8:53 PM Hamidreza Hosseini <hrhosseini at hotmail.com>
wrote:

> I correct the wrong name (It couldn't resolve from dns server), But now I
> have this error:
>
> 0 Backend_health - boot.varnish_1 Still sick 4---X-R- 0 3 5 0.007800
> 0.000000 HTTP/1.1 400 Bad Request
>
> My probe:
>
> probe myprobe {
>     .request =
>       "HEAD / HTTP/1.1"
>       "Connection: close"
>       "User-Agent: Varnish Health Probe";
>     .timeout = 3s;
>     .interval = 5s;
>     .window = 5;
>     .threshold = 3;
> }
> Should I change the probe request "HEAD /" to something else?
> Is there any way to define special port and whenever it is accessable even
> with authentication erro (error 400) it consider backend healthy?
> ------------------------------
> *From:* Hamidreza Hosseini
> *Sent:* Thursday, February 18, 2021 4:49 AM
> *To:* varnish-misc at varnish-cache.org <varnish-misc at varnish-cache.org>
> *Subject:* Varnish Health check
>
> Hi,
> I want to adjust health check on my varnish backends, But I dont know how
> can I know they are healthy or not
> because the nodes are up and running and even service is up but varnish
> does'nt work for all requests (just third of them are responding till I
> restart it (It happens sometimes)).
> How can I check this?
> ```
> backend server1 {
>     .host = "server1.example.com";
>     .probe = {
>         .request =
>           "HEAD / HTTP/1.1"
>           "Connection: close"
>           "User-Agent: Varnish Health Probe";
>         .timeout = 1s;
>         .interval = 5s;
>         .window = 5;
>         .threshold = 3;
>     }
> }
> ```
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> varnish-misc at varnish-cache.org
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>
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