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NGINX has had support for dynamic upstream modules for a while in the community distribution and examples abund. I think this is probably one of the clearest I could find. Finding a similar config for stream proxies turned out to be surprisingly hard, so here I'm sharing my solution in the hope that it can be useful to somebody. Or someone more experienced can point out a better alternative. In my case my upstream is an ELB which can and will change ip address often so using the static DNS name was not an option.

I have just completed an upgrade from OpenNMS 1.8.11 to the latest and greatest 1.10. The upgrade in itself is easy and the guides on the OpenNMS wiki will serve you well. Instead in this post I'll describe a couple of other changes that I made which improved very much the overall performance and responsiveness of the system. One is the upgrade from PostgreSQL  8.4 (which came with CentOS) to 9.1 + tuning. The other is switching from apache to nginx. Upgrading postgres is mostly a matter of taking a backup,  pulling in the right repo , running  yum install  and finally importing the database. Tuning postgres I left opennms running on PostgreSQL 9.1 for a while and then I went checking how well postgres was doing. Postgres 9 already performs significantly better that its 8.x predecessors, but I wanted to do better than out-of-the-box. As the postgres user I logged in into the opennms database to install a utility that will help me estimate how muc...