NAME

       mountsnoop - Trace mount() and umount() syscalls. Uses Linux eBPF/bcc.

SYNOPSIS

       mountsnoop

DESCRIPTION

       mountsnoop  traces the mount() and umount() syscalls, showing which processes are mounting
       and  unmounting  filesystems  in  what  mount  namespaces.  This   can   be   useful   for
       troubleshooting system and container setup.

       This  works  by  tracing  the  kernel sys_mount() and sys_umount() functions using dynamic
       tracing, and will need updating to match any changes to this function.

       This makes use of a Linux 4.4 feature (bpf_perf_event_output()).

       Since this uses BPF, only the root user can use this tool.

REQUIREMENTS

       CONFIG_BPF and bcc.

FIELDS

       COMM   Process name

       PID    Process ID

       TID    Thread ID

       MNT_NS Mount namespace inode number

       CALL   System call, arguments, and return value

OVERHEAD

       This traces the kernel mount and umount functions and prints output for each event. As the
       rate of these calls is generally expected to be very low, the overhead is also expected to
       be negligible. If your system calls mount() and umount() at a high  rate,  then  test  and
       understand overhead before use.

SOURCE

       This is from bcc.

              https://github.com/iovisor/bcc

       Also  look  in  the bcc distribution for a companion _examples.txt file containing example
       usage, output, and commentary for this tool.

OS

       Linux

STABILITY

       Unstable - in development.

AUTHOR

       Omar Sandoval

SEE ALSO

       mount(2) umount(2)