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debug: document the various flags

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Thomas Mangin 2020-04-14 18:17:53 +01:00
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docs/contributing/development.rst
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@ -701,6 +701,61 @@ circumstance, the kernel boot parameter ``vyos-config-debug`` will ensure
access to the system as user ``vyos``, and will log a Python stack trace to
``/tmp/boot-config-trace``.
Debugging features
------------------
A number of flags can be set up to change the behaviour of VyOS at runtime.
These flags can be toggled using either environment variables or creating
files.
For each feature, a file called ``vyos.feature.debug`` can be created to toggle
the feature on. If a parameter is required it can be placed inside the file as
its first line.
The file can be placed in ``/tmp`` for one time debugging (as the file will be
removed on reboot) or placed in '/config' to stay permanently.
For example, ``/tmp/vyos.ifconfig.debug`` can be created to enable interface
debugging.
It is also possible to set up the debugging using environment variables.
In that case, the name will be (in uppercase) VYOS_FEATURE_DEBUG.
for example running, ``export VYOS_IFCONFIG_DEBUG=""`` on your vash, will have
the same effect as ``touch /tmp/vyos.ifconfig.debug``.
``ifconfig``
^^^^^^^^^^^^
Once set, all commands used, and their responses received from the OS, will be
presented on the screen for inspection.
``command``
^^^^^^^^^^^
Once set, all commands used, and their responses received from the OS, will be
presented on the screen for inspection.
``developer``
^^^^^^^^^^^^^
Should a command fail, instead of printing a message to the user explaining how
to report issues, the python interpreter will start a PBD post-mortem session
to allow the developer to debug the issue.
As the debugger will wait from input from the developer, it has the capacity to
prevent a router to boot and therefore should only be permanently set up on
production if you are ready to see the OS fail to boot.
``log``
^^^^^^^
In some rare cases, it may be useful to see what the OS is doing, including
during boot. This option sends all commands used by VyOS to a file.
The default file is ``/tmp/full-log`` but it can be changed.
Priorities
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