Apache eats up all RAM, how to debug?

Question

Apache HTTP Server

Good afternoon. There is a server with 8Gb of RAM. At some point, the RAM runs out and the swap area is clogged. Apparently, apache is to blame, the situation is temporarily treated by restarting it, munin shows the following picture:

How to treat / debug? I would like to get advice both on finding the cause of this behavior, and on the configuration parameters that are paid attention to in such cases (well, except for the obvious MaxClients).

Answer 1

1 see which MPM (Multi-Processing Module) you are using in Apache.
2 read the documentation for setting up the MPM you have.
3, depending on the MPM, edit the settings MaxRequestsPerChild MinSpareServers MaxSpareServers MaxRequestsPerChild and so on.