tornado.autoreload — Automatically detect code changes in developmentВ¶

Automatically restart the server when a source file is modified.

Most applications should not access this module directly. Instead, pass the keyword argument autoreload=True to the tornado.web.Application constructor (or debug=True , which enables this setting and several others). This will enable autoreload mode as well as checking for changes to templates and static resources. Note that restarting is a destructive operation and any requests in progress will be aborted when the process restarts. (If you want to disable autoreload while using other debug-mode features, pass both debug=True and autoreload=False ).

This module can also be used as a command-line wrapper around scripts such as unit test runners. See the main method for details.

The command-line wrapper and Application debug modes can be used together. This combination is encouraged as the wrapper catches syntax errors and other import-time failures, while debug mode catches changes once the server has started.

This module depends on IOLoop , so it will not work in WSGI applications and Google App Engine. It also will not work correctly when HTTPServer ‘s multi-process mode is used.

Reloading loses any Python interpreter command-line arguments (e.g. -u ) because it re-executes Python using sys.executable and sys.argv . Additionally, modifying these variables will cause reloading to behave incorrectly.

tornado.autoreload. start ( io_loop=None, check_time=500 ) [source] В¶

Begins watching source files for changes.

Changed in version 4.1: The io_loop argument is deprecated.

Wait for a watched file to change, then restart the process.

Intended to be used at the end of scripts like unit test runners, to run the tests again after any source file changes (but see also the command-line interface in main )

Add a file to the watch list.

All imported modules are watched by default.

tornado.autoreload. add_reload_hook ( fn ) [source] В¶

Add a function to be called before reloading the process.

Note that for open file and socket handles it is generally preferable to set the FD_CLOEXEC flag (using fcntl or tornado.platform.auto.set_close_exec ) instead of using a reload hook to close them.

Command-line wrapper to re-run a script whenever its source changes.

Scripts may be specified by filename or module name:

Running a script with this wrapper is similar to calling tornado.autoreload.wait at the end of the script, but this wrapper can catch import-time problems like syntax errors that would otherwise prevent the script from reaching its call to wait .

© Copyright 2009-2017, The Tornado Authors. Revision ca6f171e .


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Gracefully Restart Lighttpd Web Server

H ow do I restart my lighttpd+php fastcgi web server gracefully under Linux / UNIX operating systems?

Command line options for UNIX / Linux

If you do not have /init.d/ or /rc.d/ style script use the following procedure. You can send INT single from command line itself and start server again:

# kill -INT $(cat /var/run/lighttpd.pid)

# lighttpd -f /etc/lighttpd.conf

You should see something as follows in your lighttpd error log file:

Make sure php socket configured as follows (without the following config, php will not get reloaded after graceful restart):

Here is a sample php5 fastcgi lighttpd.conf configuration:

A note about RHEL / CentOS Linux init.d script

Most modern Linux distributions comes with a script to start / stop / restart and reload lighttpd: