Intermittent 503's from Varnish

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Shouldnt saint mode return a 200 OK (stale cache item) if the backend fails
and you are within the "Saint Window" for that object?  I dont think
turning off saint mode is going to correct this issue.

On Fri, Nov 4, 2011 at 4:26 PM, Lei Wang <leiwang at rhapsody.com> wrote:

> 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
>> >
>>
>> _______________________________________________
>> varnish-misc mailing list
>> varnish-misc at varnish-cache.org
>> https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc****
>>
>> ** **
>>
>
>
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