reference:
https://www.cnblogs.com/bonelee/p/7735479.html
# View the number of open files
lsof |wc -l
# View the number of files a process opens
lsof -p 19764|wc -l
lsof -p 19764|more
1. List all open files:
lsof
2. Check who is using a file
lsof / filepath / File
5. lists a user opens the file information
lsof -u username
6. a program list open files information
the lsof -C MySQL
8. the lists a user and a program information file open
the lsof -u -C MySQL Test
13 is a list of all network connections.
the lsof -i
14. a list of all tcp network connection information
lsof - tcp i
15. the list all udp network connection information
lsof -i udp
16. the list who is using a port
lsof -i: 3306
# View Connections:
the netstat -n | grep the TIME | awk '{}. 5 Print $' | Cut -d: -f1 | Sort | the uniq -C | Sort -n
First, connect the unit to see which IP
netstat -an
Second, check the TCP connection number
1) 80 Number of port statistics
netstat -nat | grep -i "80" | WC the -l
2) Statistics httpd process several
PS -ef | grep httpd | WC the -l
3), connected on statistics the status is "ESTABLISHED
the netstat -Na | grep the ESTABLISHED | -l WC
which connect up the IP address isolated
netstat -na | grep ESTABLISHED | awk ' {print $ 5}' | awk -F: '{print $ 1}' | sort | uniq -c | sort -r
The sealed up.
The netstat -Na | grep the SYN | awk. 5} {Print $ | awk -F: {}. 1 Print $ | Sort | the uniq -C | -R & lt Sort 0n +
4) Check the connection of a number of ip
netstat antigen | grip 161.50 | wc -l
# View the process open file limit, first obtain the pid
cat /proc/2283/limits
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 10485760 unlimited bytes
Max core file size unlimited unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 63316 63316 processes
Max open files 1000000 1000000 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 63316 63316 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us