Varnish returns 503 error.

[Abraham Cruz Sustaita]

I understand varnish have to restart the connection and try again in
another app server (I have 5), but it allways returns the 503 error, so I
understand that means the rule is being ignored.

I have made this change to the vcl file:

backend app05 {
  .host = "app05.site.com";
  .port = "80";
  .connect_timeout = *1.5s; # I do change this from 0.7 to 1.5 but it is
still serving 503 errors...*
  .first_byte_timeout = 30s;
  .between_bytes_timeout = 30s;
  .probe = {
    .url = "/";
    .interval = 5s;
    .timeout = 1s;
    .window = 5;
    .threshold = 3;
  }
}

Do I have to increase also the first_byte_timeout?

 Abraham Cruz Sustaita

Leader Development

Mail: abraham.sustaita at buscacorp.com
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2012/6/13 Hugo Cisneiros (Eitch) <hugo.cisneiros at gmail.com>

> On Wed, Jun 13, 2012 at 5:24 PM, Abraham Cruz Sustaita
> <abraham.sustaita at buscacorp.com> wrote:
> > I'm using varnish to cache the content of my websites. It is working as
> it
> > supposed, but there is a problem. Randomly it returns an 503 error, it is
> > really strange, since the app servers are ok and the load is under .8,
> also
> > the database server its ok. Here is part of my configuration:
>
> On Varnish, 503 means an error on the backend connection. Usually this
> happens when the web server takes more time than "first_byte_timeout"
> to reply to a request. But also, if for some reason the backend can't
> connect before the "connect_timeout" delay, it'll give you a 503.
>
> The proper way to debug these kind of things is to use varnishlog on
> everything related to these 503 errors.
>
> In your configuration, why you say that restart did not work? It goes
> to "error 500 failed"? What happens exactly?
>
> --
> []'s
> Hugo
> www.devin.com.br
>
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