Tracing what a Linux process is doing
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Loading ...From time to time you will get hanged process or you are unsure of what a process is doing at that moment.
You can trace what a process is doing by running:
strace -p PID
Where PID is the process ID. Whis will show you what that process is doing in real time.
This is usefull for detecting exploits or the source of a hang process.
To detach from that process simply press CTRL + C.
Hope it helps ! Leave a comment if you have any questions.
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- June 22nd
in whm Main >> Server Status >> CPU/Memory/MySQL Usage
i found /usr/sbin/mysqld –basedir/ –datadir/var/lib/mysql –usermysql –pid-file/var/lib/mysql/ekush.starhostbd.com.pid –skip-external-locking –port3306 –socket/var/lib/mysql/mysql.sock is marked as yallow.
how can low down the load?
Honestly, I prefer to use strace -Ffv -s 8192 (-p /)
This will give you *much* more information. It will also follow any forked/spawned/cloned processes. Using this in conjunction with -o is handy for stracing cpsrvd itself so you you can look at it after the fact in less and get a better idea of what is going on.
If you are looking for a specific syscall, using this with -e is handy as well. So, if you just want to see file operations, add -e file to it (see man strace for more info)
Another neat trick is using this with awk to generate the -p flags to strace multiple processes (like httpd):
strace -Ffv -s 8192 -o ~/httpd.strace `ps aux | awk ‘/httpd/ {print ” -p ” $2}’ | tr -d ‘\n’`
which will launch a strace on every process name matching httpd.
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