Hi, Most probably, varnishncsa isn't going to give you the full picture, so let's go for the exhaustive way:
varnishlog -q "BerespStatus eq 503" -w /whatever/file you can then read the logs with varnishlog -r /whatever/file (more logging pointers here: https://docs.varnish-software.com/tutorials/vsl-query/) If you can get your hands on a failed transaction, we should be able to tell you what went wrong. Most probably, you hit a timeout of some sort. Or it could be that the backend was declared sick, if you have probes. -- Guillaume Quintard On Thu, Dec 26, 2019 at 6:33 AM Maninder Singh <[email protected]> wrote: > Hi, > > I am facing a strange problem. > > I am running varnish 4.1.11 on port 80 which is behind a LB. > > Varnish then connects to apache 2.4 ( on port 8080 ) and also have php-fpm > running. > > Now, everything works fine but once in a while I am seeing 503 response > from varnish for a POST request. During this time there is no log in apache > also ( neither access log nor error log ). > > Where does this request vanish ? > > How do I debug this issue ? > > Some more details: > > * I have varnishncsa turned on with following flags. > > ExecStart=/usr/bin/varnishncsa -q 'not (ReqURL ~ > "\.(js|css|png|jpeg|jpg|ico|gif|swf|woff)" or ReqHeader:User-Agent ~ > "HTTP-Monitor" or ReqHeader:User-Agent ~ "Monitoring/1.1")' -a -w > /var/log/varnish/varnishncsa.log -D -f /etc/sysconfig/varnishncsa > > Here is the entry in varnish log during that time. > > X.X.X.X, LB.IP.0.0 - - [25/Dec/2019:00:26:40 -0600] 2629363 "POST > http://mydomain.com/LetsCelebrate HTTP/1.1" 503 1288 " > https://referringdomain.com/LetsCelebrate?hostingUrl=https%3A%2F%2Fxy.abc.com"; > "Mozilla/5.0 (Linux; Android 9; SM-A920F) AppleWebKit/537.36 (KHTML, like > Gecko) Chrome/79.0.3945.93 Mobile Safari/537.36" "mydomain.com" miss > > In .vcl file I have following set. > .first_byte_timeout = 120s; > > Now, I am not logging varnish to apache requests ( which backend fetch ). > As you can see above I am only logging client requests. > > Is their a way to log client requests like above but then also log backend > fetch failures to another log file ? > [ Running 2 instances of varnishncsa ? ] > > Any pointers ? > > Please let me know. > > Thanks. > > _______________________________________________ > varnish-misc mailing list > [email protected] > https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc >
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