I'm running this command:
strace -f -e trace=desc ./my-program
(So you see I'm running the
Which lets me see the stdout/stderr
write commands of the parent process:
[pid 10] 07:36:46.668931 write(2, "..\n"..., 454 <unfinished ...> <stdout of ..> <stdout other output - but I don't see the write commands - so probably from a child process> [pid 10] 07:36:46.669684 write(2, "My final output\n", 24 <unfinished ...> <stdout of My final output>
What I want to see is the other write commands.
This is running in a docker container being executed with:
docker run --privileged=true my-label/my-container
My question is: How to strace all write calls (to stdout/stderr) from all child processes inside a docker container?
Note that this application starts and stops in about 2 seconds.
strace can follow its application cycle. But tools that expect it to hang around like a server process won't work. (Perhaps
sysdig can be used for this - but I haven't seen an example of this model yet).
sysdigwhich I believe has container support
sysdigwon't run against applications (ones that start and stop quickly) - only against server process that hang around perpetually. (Correct me if I'm wrong).