112 lines
3.1 KiB
ReStructuredText
112 lines
3.1 KiB
ReStructuredText
.. _acrnlog:
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Acrnlog
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#######
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Description
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***********
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``acrnlog`` is a userland tool used to capture an ACRN hypervisor log. It runs
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as a Service VM service at boot, capturing two kinds of logs:
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- log of the running hypervisor
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- log of the last running hypervisor if it crashed and the logs remain
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Log files are saved in ``/var/log/acrnlog/``, so the log files would be lost
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after a system reset.
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Usage
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*****
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The ``acrnlog`` tool is launched as a service at boot, and limited to
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supporting four 1MB log files by default. You can change this log file
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limitation temporarily or permanently.
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Options:
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-h display help
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-t specify a polling interval (ms). Once buffer is empty, acrnlog stops
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and starts reading in specified interval.
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If an incomplete log warning is reported, please try with a smaller
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interval to get a complete log.
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-s limit the size of each log file, in KB. 0 means no limitation.
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-n specify the number of log files to keep, old files would be deleted.
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Temporary Log File Changes
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==========================
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You can temporarily change the log file setting by following these
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steps:
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1. Stop the ``acrnlog`` service:
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.. code-block:: none
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sudo systemctl disable acrnlog
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2. Restart ``acrnlog``, running in the background, and specify the new
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number of log files and their size (in MB). For example:
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.. code-block:: none
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sudo acrnlog -n 8 -s 4 &
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You can use the ``loglevel`` command in the hypervisor shell (not the Service
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VM shell) to query or dynamically override the hypervisor log level
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configuration settings made in the ACRN Configurator tool to the
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:option:`hv.DEBUG_OPTIONS.MEM_LOGLEVEL`,
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:option:`hv.DEBUG_OPTIONS.CONSOLE_LOGLEVEL`, and
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:option:`hv.DEBUG_OPTIONS.NPK_LOGLEVEL` options. If the
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system is rebooted, these log level settings will return to the
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values set by the ACRN Configurator.
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The ``mem_loglevel`` parameter controls the log to be saved using
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``acrnlog``, while the ``console_loglevel`` parameter controls the log
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output to the console. For example, in the hypervisor shell you
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can use these commands:
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.. code-block:: none
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ACRN:\>loglevel
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console_loglevel: 3, mem_loglevel: 5, npk_loglevel: 5
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ACRN:\>loglevel 2 5
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ACRN:\>loglevel
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console_loglevel: 2, mem_loglevel: 5, npk_loglevel: 5
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Permanent Log File Changes
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==========================
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You can permanently change the log file settings by
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editing ``/usr/lib/systemd/system/acrnlog.service`` and use the ``-n``
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and ``-s`` options on the ``ExecStart`` cmd, and restart the service.
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For example, ``acrnlog.service`` could have these parameters added:
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.. code-block:: none
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ExecStart=/usr/bin/acrnlog -n 8 -s 4
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and then restart the service with:
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.. code-block:: none
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sudo systemctl daemon-reload
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sudo systemctl restart acrnlog
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Build and Install
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*****************
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Source code for the ``acrnlog`` tool is in the ``misc/debug_tools/acrn_log``
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directory. To build and install the tool from source, run these commands:
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.. code-block:: none
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make
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sudo make install
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and if you changed the ``acrnlog.service`` file, install it:
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.. code-block:: none
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sudo cp acrnlog.service /usr/lib/systemd/system/
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