Statistics on linux servers

Statistics on linux servers: 1) number of port 80 connections: www.2cto. comnetstat-nat | grep-I & quot; 80 & quot; | wc-l12) count httpd protocol connections ps-ef | grephttpd | wc-l13), statistics already...
Statistics on linux servers: 1) number of port 80 connections: www.2cto.com netstat-nat | grep-I "80" | wc-l12) count the number of httpd protocol connections ps-ef | grep httpd | wc-l13) and the number of connected connections. The status is "established 'netstat-na | grep ESTABLISHED | wc-l limit 1. view the number of files opened by a process in the current system: lsof (list open files) is a tool used to list files opened by the current system. lsof-p pid | wc-l 2. view the configuration: the maximum number of files that a single process can open is 8192 ulimit-n 3. when ulimit-n is executed If the system Echo is similar to "Operation notpermitted", it indicates that the above restriction modification failed because the value specified in the system exceeds the soft or hard limit on the number of files opened by the user in Linux. Therefore, you need to modify the Linux system's soft and hard limits on the number of opened files. Cat/etc/security/limits. conf0000g soft nofile 10240 Alibaba g hard nofile 10240
The limit G specifies the number of files opened by the user to be modified. the '*' sign can be used to modify the limit of all users. soft or hard specifies whether to modify the soft limit or hard limit; 10240 specifies the new limit value to be modified, that is, the maximum number of opened files (note that the soft limit value must be smaller than or equal to the hard limit ). 4. use the following command to limit the maximum number of opened files in Linux: cat/proc/sys/fs/file-max