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? -Eric Disclaimer : This email and any files transmitted with it are confidential and intended solely for intended recipients. If you are not the named addressee you should not disseminate, distribute, copy or alter this email. Any views or opinions presented in this email are solely those of the author and might not represent those of Physician Select Management. Warning: Although Physician Select Management has taken reasonable precautions to ensure no viruses are present in this email, the company cannot accept responsibility for any loss or damage arising from the use of this email or attachments.
