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Frank, currently RTM 10.1 and 10.2 support only Apache httpd and not the IBM product. Our load balancing for our Application Center product is built on Apache httpd as well, though WebSphere's Liberty is the baseline for that product.
What other httpd products were you thinking of? Technically, RTM 10.2 could run on nginx, but this would take some work to migrate to to the fpm based php interpreter, and in RHEL8, httpd is event based by default, making nginx less interesting. We did have Application Center running on Tomcat for some years prior to the acquisition of Platform Computing by IBM, moving that to the Red Hat platform might be interesting, but it is going to be Java based.
Is the real rub the load balancing architecture? If that's it, for RTM at least, this has been corrected in RTM 10.2 as RTM 10.2 can serve up the sessions from the database and the RRA directory can be cross mounted, or on highly available NFS.
For the WebSphere Liberty, it presently does provide fail over and load balancing support, but not where sessions can be served from any node in the cluster, it's more akin to a sticky session. If the node that is serving your session goes down, then you have to log in again. WebSphere Liberty does support database sessions, but we have chosen not to implement this at the current time.
Please let us know.