Intermittent 503's from Varnish

[Lei Wang]

Hi August,

Thank for the info. I will definitely try that today.

Have a nice day.

Lei

On Fri, Nov 4, 2011 at 12:48 PM, Gresens, August <AGresens at scholastic.com>wrote:

>  We were able to resolve this. Our Varnish instance is pointing a load
> balanced  pool of backend servers (a vip on a hardware load balancer), so
> to Varnish there is only one backend. We had a situation in which certain
> images were returning 500 errors from the backend. Because saint mode was
> enabled, it invalidated the backend (the only back end) after a certain
> number of failures within a particular window. We disabled saint mode and
> this fixed this issue. Best, August****
>
> ** **
>  ------------------------------
>
> *From:* Lei Wang [mailto:leiwang at rhapsody.com]
> *Sent:* Friday, November 04, 2011 3:40 PM
> *To:* Rob S
> *Cc:* Gresens, August; varnish-misc at varnish-cache.org
> *Subject:* Re: Intermittent 503's from Varnish****
>
> ** **
>
> I had the same problem. Please help!
>
> /usr/sbin/varnishd -P /var/run/varnish80.pid -a :80 -f
> /etc/varnish/varnish80.vcl -T 127.0.0.1:6082 -t 120 -w 1,1000,120 -u
> varnish -g varnish -i varnish81 -S /etc/varnish/secret -p
> thread_pool_add_delay 2 -p thread_pools 1 -p thread_pool_min 800 -p
> thread_pool_max 2000 -p session_linger 50 -p sess_workspace 4096 -n
> varnish80 -s malloc,6.5G
>
> configuration related to this problem:
> backend eadrm {
>   .host = "drm-ea.xxxxxxxx.com";
>   .port = "80";
>   .connect_timeout = 40s;
>   .first_byte_timeout = 80s;
>   .between_bytes_timeout = 40s;
> }
>
>   }  elsif (req.http.host ~ "drm-ea") {
>      unset beresp.http.set-cookie;
>      set beresp.ttl = 86400s;
>      log "Adjusting EA-DRM TTL to 86400 seconds";
>
> Thanks,
>
> Lei****
>
> On Fri, Nov 4, 2011 at 11:52 AM, Rob S <rtshilston at gmail.com> wrote:****
>
> Can you send the varnishlog for one of these failing requests?  Is
> this a POST or a GET request?  Are you using default VCL, or can you
> send the VCL you are using?
>
> Rob****
>
> On Fri, Nov 4, 2011 at 6:44 PM, Gresens, August <AGresens at scholastic.com>
> wrote:
> > Hello
> >
> >
> >
> > We’re having a very nasty production issue. We’re getting intermittent
> 503
> > from Varnish in front of a healthy backend.
> >
> >
> >
> > This seems to happen on cache-miss, but we’re not seeing requests make
> it to
> > the backend. Varnish immediately returns the 503. After the first 503,
> the
> > page can usually be loaded by requesting it a few more times. This seems
> to
> > indicate that there is some condition within Varnish that prevents it
> from
> > hitting the backend that clears up quickly.
> >
> >
> >
> > Has anyone seen this issue before? Is there anything we can try?
> >
> >
> >
> > This is our startup config:
> >
> >
> >
> > DAEMON_OPTS="-a :80 \
> >
> > -T localhost:6082 \
> >
> > -f /etc/varnish/default.vcl \
> >
> > -S /etc/varnish/secret \
> >
> > -s file,/var/lib/varnish/$INSTANCE/varnish_storage.bin,1G \
> >
> > -p http_headers=128 \
> >
> > -p sess_workspace=262144 \
> >
> > -p connect_timeout=60 \
> >
> > -p max_restarts=6 \
> >
> > -p log_hashstring=on \
> >
> > -p cli_timeout=60 \
> >
> > -t 0"
> >
> >
> >
> > We are on version 2.0.5
> >
> >
> >
> > Thanks,
> >
> >
> >
> > August
> >
> >
> >
> >
> >****
>
> > _______________________________________________
> > varnish-misc mailing list
> > varnish-misc at varnish-cache.org
> > https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
> >
>
> _______________________________________________
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>
> ** **
>
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