After looking at the documentation on httpd.apache.org and wiki.apache.org I have a few questions ...
2. On the wiki page it says "Using too many sockets will cause apache to give a (99)Cannot assign requested address: error"
If PHP-FPM is configured to use "ondemand" does this help avoid that problem?
3. If "ondemand" is used in PHP-FPM, is it still advisable to tweak /proc/sys/net/ipv4/tcp_tw_reuse?
4. What are some advisable ways to determine an ideal value for "ulimit" if using Unix Domain Sockets?