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CentOS server RAM usage 100%

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linux-howto

http://serverfault.com – I am using Linux CentOS 5.8 VPS. But my site is so slow in last two days. When i cehcked in server's web control panel; RAM usage is 99-100 %. But when i write "top" command; there is any usage on RAM. When i write netstat -ntu | awk '{print $5}' | awk '{sub("::ffff:","");print}' | cut -f1 -d ':' | sort | uniq -c | sort -n | grep -v -e server -e Address -e 127.0.0.1 -e 0.0.0.0 Its giving lists of which IPs still connect. Result is here: 1 131.253.41.xxx 1 178.154.255.xxx 1 188.57.200.xxx 1 207.46.199.xxx 2 77.92.139.xxx 2 88.225.27.xxx 4 95.0.24.xxx 5 65.55.215.xxx 6 174 (HowTos)