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.
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