Checking network connections in a server
In order to view all the current connections and the IP
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netstat -anp | grep 80 | awk ‘{print $5}’ | cut -f1 -d: | sort | uniq -c | sort -n
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To detect syn flood attack
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netstat -plan | grep :80 | grep SYN_RECV | wc -l
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Max child process size can be determined using the command :
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ps -ylC httpd –sort:rss
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The total memory usage for the webserver can be determined using the command :
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ps -ylC httpd –sort:rss | awk ‘{a+=$8}END{print a}’
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