Why can't I start my gunicorn server? "Connection in use"

Question

Any ideas why my gunicorn server won't start?

jeffy@originaldjangster:~$ sudo /home/jeffy/django_files/django_test_venv/bin/gunicorn -c /home/jeffy/django_files/django_test_venv/gunicorn_config.py django_test.wsgi  Connection in use: ('127.0.0.1', 8001)  Retrying in 1 second.  Connection in use: ('127.0.0.1', 8001)  Retrying in 1 second.  Connection in use: ('127.0.0.1', 8001)  Retrying in 1 second.  Connection in use: ('127.0.0.1', 8001)  Retrying in 1 second.  Connection in use: ('127.0.0.1', 8001)  Retrying in 1 second.  Can't connect to ('127.0.0.1', 8001) jeffy@originaldjangster:~$ 

nginx listens to http://104.131.200.120/, and passes to gunicorn, which listens to 127.0.0.1. I'm on Ubuntu 14.

I've listed all processes to see if gunicorn was already running:

jeffy@originaldjangster:~$ ps -a    PID TTY          TIME CMD   7653 pts/1    00:00:00 ps  jeffy@originaldjangster:~$ ps    PID TTY          TIME CMD   7249 pts/1    00:00:00 bash   7654 pts/1    00:00:00 ps  jeffy@originaldjangster:~$ ps -A    PID TTY          TIME CMD      1 ?        00:00:02 init      2 ?        00:00:00 kthreadd      3 ?        00:00:00 ksoftirqd/0      5 ?        00:00:00 kworker/0:0H      6 ?        00:00:00 kworker/u2:0      7 ?        00:00:00 rcu_sched      8 ?        00:00:00 rcu_bh      9 ?        00:00:00 migration/0     10 ?        00:00:00 watchdog/0     11 ?        00:00:00 khelper     12 ?        00:00:00 kdevtmpfs     13 ?        00:00:00 netns     14 ?        00:00:00 writeback     15 ?        00:00:00 kintegrityd     16 ?        00:00:00 bioset     17 ?        00:00:00 kworker/u3:0     18 ?        00:00:00 kblockd     19 ?        00:00:00 ata_sff     20 ?        00:00:00 khubd     21 ?        00:00:00 md     22 ?        00:00:00 devfreq_wq     23 ?        00:00:08 kworker/0:1     24 ?        00:00:00 khungtaskd     25 ?        00:00:00 kswapd0     26 ?        00:00:00 ksmd     27 ?        00:00:00 fsnotify_mark     28 ?        00:00:00 ecryptfs-kthrea     29 ?        00:00:00 crypto     41 ?        00:00:00 kthrotld     44 ?        00:00:00 scsi_eh_0     45 ?        00:00:00 scsi_eh_1     66 ?        00:00:00 deferwq     67 ?        00:00:00 charger_manager    120 ?        00:00:01 jbd2/vda-8    121 ?        00:00:00 ext4-rsv-conver    271 ?        00:00:00 upstart-udev-br    275 ?        00:00:00 systemd-udevd    322 ?        00:00:00 dbus-daemon    349 ?        00:00:00 kpsmoused    351 ?        00:00:00 kworker/0:2    356 ?        00:00:00 systemd-logind    358 ?        00:00:00 rsyslogd    387 ?        00:00:00 kvm-irqfd-clean    624 ?        00:00:00 upstart-file-br    704 ?        00:00:00 upstart-socket-    758 tty4     00:00:00 getty    761 tty5     00:00:00 getty    767 tty2     00:00:00 getty    768 tty3     00:00:00 getty    770 tty6     00:00:00 getty    794 ?        00:00:00 sshd    800 ?        00:00:00 acpid    802 ?        00:00:00 cron    804 ?        00:00:00 atd    853 ?        00:00:01 postgres    855 ?        00:00:00 postgres    856 ?        00:00:01 postgres    857 ?        00:00:01 postgres    858 ?        00:00:02 postgres    859 ?        00:00:02 postgres    903 ?        00:00:17 supervisord    961 tty1     00:00:00 getty    982 ?        00:00:00 kauditd   1266 ?        00:00:07 kworker/u2:1   3027 ?        00:00:00 kworker/u3:1   3230 ?        00:00:00 sudo   3231 ?        00:00:01 gunicorn   7014 ?        00:00:00 gunicorn   7115 ?        00:00:00 sshd   7192 ?        00:00:00 sshd   7193 ?        00:00:00 sftp-server   7200 ?        00:00:00 sshd   7248 ?        00:00:00 sshd   7249 pts/1    00:00:00 bash   7610 ?        00:00:00 nginx   7613 ?        00:00:00 nginx   7614 ?        00:00:00 nginx   7615 ?        00:00:00 nginx   7616 ?        00:00:00 nginx   7649 ?        00:00:00 sshd   7650 ?        00:00:00 sshd  7655 pts/1    00:00:00 ps 

Here's the two gunicorn lines:

  3231 ?        00:00:01 gunicorn   7014 ?        00:00:00 gunicorn 

I've tried to kill those two processes, but when bringing them to the foreground with fg 3231, for example, it says "no such job".

Someone suggested I try netstat -aWn --programs | grep 80. Here is the result, which I don't understand

jeffy@originaldjangster:~$ sudo netstat -aWn --programs | grep 80  tcp        0      0 127.0.0.1:8001          0.0.0.0:*               LISTEN      3231/python3.4  unix  2      [ ACC ]     STREAM     LISTENING     8911     800/acpid           /var/run/acpid.socket  unix  2      [ ]         DGRAM                    8908     800/acpid 

Any ideas what is causing this "connection in use" error? Thanks.

Answer 1

Turns out I just needed to sudo kill 3231 and sudo kill 7014. I incorrectly thought they first needed to brought to the foreground. The fact that the processes couldn't be seen until I used the capital A option (ps -A) mislead me, that they were somehow special.

The server was running (in the foreground) when I went to sleep before my wife. She turned off the computer before going to bed.

Ubuntu and gunicorn Newbie. Could you tell?