title: Ubuntu php5-fpm throws unknown instance on reload
body: <p>I am having some problems with ubuntu and php5-fpm on my VPS.
  Php works fine, however it throws terminal error when I am trying to reload / restart / stop it. Basically, I cannot stop php because it does not recognize the instance</p>
  
  <p>It says "reload: Unknown instance:"
  If I try "service php5-fpm restart" it sais unknown instance and gives this in logs</p>
  
  <pre><code>[15-Nov-2013 11:56:40] ERROR: An another FPM instance seems to already listen on /var/run/php5-fpm.sock
  [15-Nov-2013 11:56:40] ERROR: FPM initialization failed
  [15-Nov-2013 11:56:40] NOTICE: configuration file /etc/php5/fpm/php-fpm.conf test is successful
  </code></pre>
  
  <p>I have php listening on /var/run/php5-fpm.sock ;
  I use nginx for webserver and it is correctly configured with </p>
  
  <pre><code>fastcgi_pass unix:/var/run/php5-fpm.sock;
  </code></pre>
  
  <p>(or so I know)
  Also need to mention that this happened after a reboot.</p>
  
  <p>Site is working well, however I don't think this is a good sign. Any thoughts ?
  Thank you.</p>
  
  <p>EDIT : I did as suggested in below post. It seems that if i kill the process, and then use start/stop it works fine. However, after I use reload command, it stops recongizing the instance.</p>
  
  <pre><code>root@developer2:/# service php5-fpm stop
  stop: Unknown instance:
  root@developer2:/# ps -ef
  UID        PID  PPID  C STIME TTY          TIME CMD
  root         1     0  0 Nov14 ?        00:00:00 init
  root      1101     1  0 Nov14 ?        00:00:00 /sbin/udevd --daemon
  root      1168     1  0 Nov14 ?        00:00:00 /usr/sbin/sshd -D
  root      1227     1  0 Nov14 ?        00:00:00 /usr/sbin/xinetd -dontfork -pidfile /var/run/xinetd.pid -stayalive -inetd_compa
  root      1229     1  0 Nov14 ?        00:00:00 cron
  mysql     1249     1  0 Nov14 ?        00:00:18 /usr/sbin/mysqld
  syslog    1283     1  0 Nov14 ?        00:00:00 /sbin/syslogd -u syslog
  memcache  1293     1  0 Nov14 ?        00:00:07 /usr/bin/memcached -m 64 -p 11211 -u memcache -l 127.0.0.1
  root      1426     1  0 Nov14 ?        00:00:00 /usr/lib/postfix/master
  postfix   1440  1426  0 Nov14 ?        00:00:00 qmgr -l -t fifo -u
  root      1468     1  0 Nov14 ?        00:00:00 /usr/sbin/varnishd -P /var/run/varnishd.pid -a :80 -T localhost:6082 -f /etc/va
  nobody    1469  1468  0 Nov14 ?        00:01:14 /usr/sbin/varnishd -P /var/run/varnishd.pid -a :80 -T localhost:6082 -f /etc/va
  root      1593     1  0 Nov14 ?        00:00:14 /usr/bin/python /usr/bin/fail2ban-server -b -s /var/run/fail2ban/fail2ban.sock
  root      1595     1  0 Nov14 ?        00:00:00 /usr/lib/gamin/gam_server
  www-data  3535     1  0 Nov14 ?        00:00:30 php-fpm: pool www
  postfix  10016  1426  0 11:18 ?        00:00:00 pickup -l -t fifo -u -c
  root     10064  1168  0 11:37 ?        00:00:00 sshd: root@pts/0
  root     10080 10064  0 11:37 pts/0    00:00:00 -bash
  root     10143  1168  0 11:47 ?        00:00:00 sshd: root@notty
  root     10159 10143  0 11:47 ?        00:00:00 /usr/lib/openssh/sftp-server
  root     11330     1  0 12:03 ?        00:00:00 nginx: master process /usr/sbin/nginx
  www-data 11331 11330  0 12:03 ?        00:00:00 nginx: worker process
  www-data 11332 11330  0 12:03 ?        00:00:00 nginx: worker process
  www-data 11333 11330  0 12:03 ?        00:00:00 nginx: worker process
  www-data 11334 11330  0 12:03 ?        00:00:00 nginx: worker process
  root     11465  1168  0 12:14 ?        00:00:00 sshd: root@notty
  root     11481 11465  0 12:14 ?        00:00:00 /usr/lib/openssh/sftp-server
  root     11519 10080  0 12:23 pts/0    00:00:00 ps -ef
  root@developer2:/# kill 3535
  root@developer2:/# service php5-fpm start
  php5-fpm start/running, process 11529
  root@developer2:/# service php5-fpm stop
  php5-fpm stop/waiting
  root@developer2:/# service php5-fpm start
  php5-fpm start/running, process 11544
  root@developer2:/# service php5-fpm stop
  php5-fpm stop/waiting
  root@developer2:/# service php5-fpm start
  php5-fpm start/running, process 11559
  root@developer2:/# service php5-fpm reload
  root@developer2:/# service php5-fpm reload
  reload: Unknown instance:
  </code></pre>
  
  <p>Edit 2 :
  my php5 seems to create 3 processes</p>
  
  <pre><code>root     11813     1  1 12:34 ?        00:00:00 php-fpm: master process (/etc/php5/fpm/php-fpm.conf)
  www-data 11815 11813  0 12:34 ?        00:00:00 php-fpm: pool www
  www-data 11816 11813  0 12:34 ?        00:00:00 php-fpm: pool www
  </code></pre>
  
  <p>When I use reload function the master process dissapears and I have to manually kill the other 2 processes in order to be able to correctly start it again.</p>