Article Title: Linux Server maintains the number of statistical connections to view external IP addresses. Linux is a technology channel of the IT lab in China. Includes some statistics on some basic classification servers, such as desktop applications, Linux system management, kernel research, embedded systems, and open source:
1) count the number of connections on port 80
Netstat-nat | grep-I "80" | wc-l
1
2) count the number of httpd connections
Ps-ef | grep httpd | wc-l
1
3) collect statistics on connected instances in the "established" status'
Netstat-na | grep ESTABLISHED | wc-l
2
4) Find out which IP Address has the most connections and seal it.
Netstat-na | grep ESTABLISHED | awk '{print $5}' | awk-F: '{print $1}' | sort | uniq-c | sort-r + 0n Netstat-na | grep SYN | awk '{print $5}' | awk-F: '{print $1}' | sort | uniq-c | sort-r + 0n |
