Your problem seems to be in the client-to-db server side of things. Not tomcat as a server.
On Wed, Dec 29, 2021 at 2:11 PM Eric Robinson <eric.robin...@psmnv.com> wrote: > We want to run a large number of tomcat instances on the same server > without virtualization or containerization. Each instance is executed from > its own folder tree and listens on its own unique TCP port. Each instance > will run code that connects to a backend database server to send queries > that are triggered by JSP calls from users. We’ve done this successfully > with up to 120 instances of tomcat running on the same server while > avoiding the overhead of virtualization and the complexity of containers. > Based on our experience over the past decade, we know that we could > potentially host 500 or more separate tomcat instances on the same server > without running into performance problems. So now we want to make it 500 > parallel instances. > > > > Here’s the problem. When tomcat initiates an outbound connection (for > example, with Connector/J to query a backend database) it establishes a > socket, and the socket has a client port. With thousands of users making > requests that require the tomcat services to query back end databases, the > OS can easily run out of available client ports to allocate to sockets. To > avoid that problem, we can assign multiple IPs to the server and use the > localSocketAddress property of Connector/J to group tomcats such that only > a subset of them each use the same source IP. Then each group will have its > own range of 64,000-ish client ports. I’ve tested this and it works. > > > > My question is, is there a better way? > > > > > > <113> > > > 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. >
