[SOLVED] Use perf inside a docker container without --privileged

Use perf inside a docker container without --privileged

I am trying to use the perf tool inside a Docker container to record a given command.

kernel.perf_event_paranoid is set to 1, but the container behaves just as if it were 2, when I don't put the --privileged flag.

I could use --privileged, but the code I am running perf on is not trusted and if I am OK with taking a slight security risk by allowing perf tool, giving privileged rights on the container seems a different level of risk.

Is there any other way to use perf inside the container?

~$ docker version
Client:
 Version:      17.03.1-ce
 API version:  1.27
 Go version:   go1.7.5
 Git commit:   7392c3b/17.03.1-ce
 Built:        Tue May 30 17:59:44 2017
 OS/Arch:      linux/amd64

Server:
 Version:      17.03.1-ce
 API version:  1.27 (minimum version 1.12)
 Go version:   go1.7.5
 Git commit:   7392c3b/17.03.1-ce
 Built:        Tue May 30 17:59:44 2017
 OS/Arch:      linux/amd64
 Experimental: false

~$ cat /proc/sys/kernel/perf_event_paranoid
1
~$ perf record ./my-executable
perf_event_open(..., PERF_FLAG_FD_CLOEXEC) failed with unexpected error 1 (Operation not permitted)
perf_event_open(..., 0) failed unexpectedly with error 1 (Operation not permitted)
Error:
You may not have permission to collect stats.
Consider tweaking /proc/sys/kernel/perf_event_paranoid:
 -1 - Not paranoid at all
  0 - Disallow raw tracepoint access for unpriv
  1 - Disallow cpu events for unpriv
  2 - Disallow kernel profiling for unpriv

Solution