On 09/09/17 12:43, Nicolas Kovacs wrote: > Hi, > > A few days ago I checked the health of my main public server running > CentOS 7, a quad-core machine with 16 GB RAM. It had been running > non-stop for 65 days, hosting only a handful of services (BIND, NTP, > Apache, Postfix, Dovecot) for two domains. > > I was surprised to see that RAM consumption was relatively high, and > apparently, the machine even had to swap at some time. > Why were you surprised? Linux systems use the available RAM, surely you understand that? Of course there is the possibility that you have discovered a bug and there is a memory leak on your system, building up over time. I suggest you show the list full memory usage details if you feel this is the case. > I read up a bit on RAM consumption, and now I wonder if flushing the > memory cache regularly is a good idea. > > https://tecadmin.net/flush-memory-cache-on-linux-server/ > > Any suggestions? > Did you read the kernel documentation on the subject linked in comments section of that article? > Niki >