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41 lines
1.5 KiB
ReStructuredText
41 lines
1.5 KiB
ReStructuredText
.. _signals:
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================
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Signals Handling
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================
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A brief description of the signals handled by Gunicorn. We also document the
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signales used internally by Gunicorn to communicate with the workers. With the
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exception of TTIN/TTOU the signals handling match the behaviour of `nginx
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<http://wiki.nginx.org/CommandLine>`.
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Master process
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==============
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- **TERM**, **INT**: Quick shutdown
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- **QUIT**: Graceful shutdwn. I waits for workers to finish their
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current request before finishing until the *graceful timeout*.
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- **HUP**: Reload the configuration, start the new worker processes with a new
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configuration and gracefully shutdown older workers. If the application is
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not preloaded (using the ``--preload`` option), Gunicorn will also load the
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new version.
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- **TTIN**: Increment the number of processes by one
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- **TTOU**: Decrement the nunber of processes by one
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- **USR1**: Reopen the log files
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- **USR2**: Upgrade the Gunicorn on the fly. A separate **QUIT** signal should
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be used to kill the old process. This signal can also be used to use the new
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versions of pre-loaded applications.
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- **WINCH**: Gracefully shutdown the worker processes when gunicorn is
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daemonized.
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Worker process
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==============
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Sending signals directly to the worker processes should not normally be
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needed. If the master process is running, any exited worker will be
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automatically respawned.
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- **TERM**, **INT**: Quick shutdown
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- **QUIT**: Graceful shutdown
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- **USR1**: Reopen the log files
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