I have a rabbitmq management process running, which opens a port 15672,
tcp 0 0 0.0.0.0:15672 0.0.0.0:* LISTEN 5431/beam
As you can see the process has a PID of 5431.
If I go to /proc/5431 and run ls fd, I don't see port 15672 in that list (suppressed output),
lr-x------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 0 -> /dev/null
lrwx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 1 -> socket:[351505]
lrwx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 12 -> socket:[375420]
lrwx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 2 -> socket:[351505]
lr-x------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 3 -> /dev/null
lrwx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 4 -> anon_inode:[eventpoll]
lr-x------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 5 -> pipe:[351690]
lrwx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 54 -> socket:[351702]
lrwx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 55 -> socket:[351704]
l-wx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 6 -> pipe:[351690]
lr-x------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 60 -> pipe:[351726]
l-wx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 63 -> pipe:[351727]
lrwx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 68 -> socket:[351740]
lrwx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 69 -> socket:[351743]
lrwx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 7 -> anon_inode:[timerfd]
lrwx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 70 -> socket:[351774]
lrwx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 71 -> socket:[357375]
lrwx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 72 -> socket:[351818]
lrwx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 8 -> socket:[351698]
lrwx------ 1 rabbitmq rabbitmq 64 Sep 12 14:59 9 -> socket:[357167]
Can someone please tell me why port 15672 is not listed there?
You can find the fd this way:
pid=5431
find /proc/$pid/fd -lname 'socket:\['$(grep 00000000:3D38/proc/$pid/net/tcp|awk '{print $10}')'\]'
3D38 is the base-16 equivalent of 15672
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