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