NAME

       tcplife - Trace TCP sessions and summarize lifespan. Uses Linux eBPF/bcc.

SYNOPSIS

       tcplife [-h] [-T] [-t] [-w] [-s] [-p PID] [-D PORTS] [-L PORTS]

DESCRIPTION

       This  tool  traces  TCP  sessions  that open and close while tracing, and prints a line of
       output to summarize each one.  This  includes  the  IP  addresses,  ports,  duration,  and
       throughput  for  the  session.  This  is  useful  for  workload  characterisation and flow
       accounting: identifying what connections are happening, with the bytes transferred.

       This tool works using the sock:inet_sock_set_state tracepoint if it exists, added to Linux
       4.16,  and  switches  to  using  kernel  dynamic tracing for older kernels. Only TCP state
       changes are traced, so it is expected that the overhead of this tool is  much  lower  than
       typical send/receive tracing.

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

REQUIREMENTS

       CONFIG_BPF and bcc.

OPTIONS

       -h     Print usage message.

       -s     Comma separated values output (parseable).

       -t     Include a timestamp column (seconds).

       -T     Include a time column (HH:MM:SS).

       -w     Wide column output (fits IPv6 addresses).

       -p PID Trace this process ID only (filtered in-kernel).

       -L PORTS
              Comma-separated list of local ports to trace (filtered in-kernel).

       -D PORTS
              Comma-separated list of destination ports to trace (filtered in-kernel).

EXAMPLES

       Trace all TCP sessions, and summarize lifespan and throughput:
              # tcplife

       Include a timestamp column, and wide column output:
              # tcplife -tw

       Trace PID 181 only:
              # tcplife -p 181

       Trace connections to local ports 80 and 81 only:
              # tcplife -L 80,81

       Trace connections to remote port 80 only:
              # tcplife -D 80

FIELDS

       TIME   Time of the call, in HH:MM:SS format.

       TIME(s)
              Time of the call, in seconds.

       PID    Process ID

       COMM   Process name

       IP     IP address family (4 or 6)

       LADDR  Local IP address.

       RADDR  Remote IP address.

       LPORT  Local port.

       RPORT  Remote port.

       TX_KB  Total transmitted Kbytes.

       RX_KB  Total received Kbytes.

       MS     Lifespan of the session, in milliseconds.

OVERHEAD

       This traces the kernel TCP set state function, which should be called much less often than
       send/receive tracing, and therefore have lower overhead.  The  overhead  of  the  tool  is
       relative  to  the  rate of new TCP sessions: if this is high, over 10,000 per second, then
       there may be noticeable overhead just to print out  10k  lines  of  formatted  output  per
       second.

       You  can  find  out  the  rate  of  new  TCP sessions using "sar -n TCP 1", and adding the
       active/s and passive/s columns.

       As always, test and understand this tools overhead for  your  types  of  workloads  before
       production 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

       Brendan Gregg

SEE ALSO

       tcpaccept(8), tcpconnect(8), tcptop(8)