I'm having some problem with a couple of servers having quite much amount of connections.
The servers just hangs for new network connections (although the functionality of load balancing in haproxy seems to work correct). I can not connect to ssh, and server cannot connect to other sockets.
I stayed connected with one console on screen to server. Then the error occurred I was not able to execute any command via screen.
# ls -bash: fork: Cannot allocate memory
I could not execute "free -m" to show number of memory, but I got monitoring implemented which indicated, that the last value send was (RAM free, Buffers free, Swap free) (3597MB, 5793, 5783).
Server has many TIME_WAIT connection in netstat despite I changes tcp_fin_timeout to 15 (9155 TIME_WAIT, 55 ESTABLISHED). I was only able to run ulimits -a
core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited max nice (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 88064 max locked memory (kbytes, -l) 32 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 max rt priority (-r) 0 stack size (kbytes, -s) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 88064 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited
PS. It's not a VPS. It's DELL.