> On Jun 24, 2024, at 15:19, Eric Robinson <eric.robin...@psmnv.com> wrote: > > We have a tomcat server that is not that busy. It has 100 tomcat instances > running, but it handles a few hundred connections per second total, across > all of them. It intermittently rejects connection attempts to listening > tomcats. The server is running Rocky 8, has 48 cores (about 15-40% utilized), > 1T RAM (400G free), with NVME storage. 'sar' shows almost 0% iowait. > > During production: > > * /proc/sys/net/netfilter/nf_conntrack_count shows anywhere from 100K to > 250K connections > * /proc/sys/net/netfilter/nf_conntrack_max is set to 2M. > * netstat -an|wc -l usually shows 90-150K connections > > Obviously, the TCP stack must be running into some resource limitation, or > some kind of race condition. I've been working the issue for hours and days, > without success. How can I determine exactly why the tomcats intermittently > reject connections?
Perhaps some of the Tomcat processes are occasionally running out of file descriptors? - Chuck --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
