Supervisord

Supervisord is a very useful process manager implemented in Python. Supervisord can change your non-daemon application into a daemon application. The application needs to be a non-daemon app.
So if you want to use Supervisord to manage nginx, you need to set daemon off to run nginx in non-daemon mode.

Install Supervisord

1. install setuptools

   wget https://pypi.python.org/packages/2.7/s/setuptools/setuptools-0.6c11-py2.7.egg
   
   
   sh setuptools-0.6c11-py2.7.egg 
   
   
   easy_install supervisor
   
   
   echo_supervisord_conf >/etc/supervisord.conf
   
   
   mkdir /etc/supervisord.conf.d
   

2. config /etc/supervisord.conf

   [include]
   files = /etc/supervisord.conf.d/*.conf
   

3. Create new application to be managed

   cd /etc/supervisord.conf.d
   vim beepkg.conf
   

   Configurations：

   [program:beepkg]
   directory = /opt/app/beepkg
   command = /opt/app/beepkg/beepkg
   autostart = true
   startsecs = 5
   user = root
   redirect_stderr = true
   stdout_logfile = /var/log/supervisord/beepkg.log
   

Supervisord Manage

Supervisord provides two commands, supervisord and supervisorctl:

• supervisord: Initialize Supervisord, run configed processes
  
• supervisorctl stop programxxx: Stop process programxxx. programxxx is configed name in [program:beepkg]. Here is beepkg.
  
• supervisorctl start programxxx: Run the process.
  
• supervisorctl restart programxxx: Restart the process.
  
• supervisorctl stop groupworker: Restart all processes in group groupworker
  
• supervisorctl stop all: Stop all processes. Notes: start, restart and stop won’t reload the latest configs.
  
• supervisorctl reload: Reload the latest configs.
  
• supervisorctl update: Reload all the processes who’s config has changed.
  

Notes: The processes stopped by stop manually won’t restart after reload or update.