The Server worked stable for more than one day. Looks like some of the changed settings were needed. But I was facing a run out of memory again one hour ago. This time it process "clamd" was killed.
Out of memory: Kill process 25856 (clamd) score 189 or sacrifice child.
Killed process 25856 (clamd), UID 989, total-vm 910636 kB, anon-rss: 786100 kB, file-rss: 0kB, shame: 0kB
Output from vmstat:
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
r b swpd free buff cache si so bi bo in cs us sy id wa st
16 3 1407748 156600 0 270352 69 56 2134 825 193 113 13 4 82 0 0
I don't understand what the logs are telling me and what I have to do now.