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Strace is a Linux command that allows you to follow what a process on your server is doing. strace is a powerful command line tool for debugging and trouble shooting programs in Unix-like operating systems such as Linux. It captures and records all system calls made by a process and the signals received by the process.
Let's say process 351711 has been running for an extended period, and you're wondering if it's doing anything, or it's hung/stuck - strace is perfect for such situations! First of all, we need to install it.
If strace is not pre-installed on your Linux system, run the appropriate command below for your distribution, to install it.
Once it's installed, it's as simple as running strace -p PID (where PID is the process ID).
If there's no process running, you'll see something like this:
Output:
And If a process is already running, above command will fill your screen with continues output that shows system calls being made by the process, to end it, press Ctrl+c
For additional information, see the strace man page.
Let's say process 351711 has been running for an extended period, and you're wondering if it's doing anything, or it's hung/stuck - strace is perfect for such situations! First of all, we need to install it.
If strace is not pre-installed on your Linux system, run the appropriate command below for your distribution, to install it.
Code:
$ sudo apt install strace #Debian/Ubuntu # yum install strace #RHEL/CentOS # dnf install strace #Fedora 22+
Once it's installed, it's as simple as running strace -p PID (where PID is the process ID).
If there's no process running, you'll see something like this:
Code:
# strace -p 351711
strace: attach: ptrace(PTRACE_ATTACH, ...): No such process
And If a process is already running, above command will fill your screen with continues output that shows system calls being made by the process, to end it, press Ctrl+c
For additional information, see the strace man page.
Code:
$ man strace