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.. IVLE - Informatics Virtual Learning Environment
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Copyright (C) 2007-2009 The University of Melbourne
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.. This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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.. This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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.. You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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**************************
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Frequently Asked Questions
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**************************
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This is a list of Frequently Asked Questions for IVLE. It answers questions
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about common issues encountered when configuring or running the system.
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... change the Terms of Service notice?
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---------------------------------------
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You should customize the ToS notice at :file:`/var/lib/ivle/notices/tos.html`.
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... Apache not restart?
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-----------------------
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Make sure no console processes are lying around (e.g. sudo killall
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python), then restart with ``sudo /etc/init.d/apache2 restart``. If the issue
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persists, try stopping the server and starting it in two separate
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steps, so you see the errors reported by the start script.
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... IVLE dump me back to the login screen with no error when I try to login?
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----------------------------------------------------------------------------
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This is usually because IVLE can't save your session information. IVLE saves
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sessions to a sessions directory on disk. Unfortunately, this is not currently
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configurable in :file:`./setup.py` config. You need to edit the Apache config
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Look for ``PythonOption mod_python.file_session.database_directory``. Make
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sure it is set to the place you want. Then, you need to manually make sure
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that directory exists.
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The default is :file:`/var/lib/ivle/sessions`.
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... ivle-buildjail fail with 'Error: Jail contains world writable path'
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-----------------------------------------------------------------------
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When running :program:`ivle-buildjail` you may occasionally see an error
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Error: Jail contains world writable path:
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'/var/lib/ivle/jails/__base_build__/tmp/.ICE-unix'.
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This is a security vulnerability as jail template contents are shared
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between users. Please either make this path world unwriteable or remove it
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This means that writable files exist in the Jail template. If left in the jail
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then users would be able to edit a file that is shared between all jail
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instances. The usual solution is just to remove these file from the jail build
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directory and try again.
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At present it is not possible to include world writable files outside a user's
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home directory so if this file is deliberately included you will need to
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ensure that it is not world writeable.
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... the console return 'Console Restart' messages
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-------------------------------------------------
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There are three cases where a console may be restarted:
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1. **Console Restart: The IVLE console has timed out due to inactivity**
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The Python console process is no longer running. This is most likey due to
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the console process being automatically terminated due to no messages
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being sent or received by the console in the previous 15 minutes.
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This message can also be triggered if the console is terminated for
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another reason (such as being sent :const:`SIGKILL` from the system
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command line or any other fatal signal).
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2. **Console Restart: CPU Time Limit Exceeded**
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To prevent exhaustion of local system resources, Python console processes
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are set with an CPU Time Limit of 25 seconds of user time (time executing
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on the CPU rather than real "clock-on-the-wall" time).
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This setting can be configured by changing the values associated with
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:const:`RLIMIT_CPU` in :file:`bin/trampoline/trampoline.c`.
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3. **Console Restart: Communication to console process lost**
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IVLE was unable to understand a response from the console process. This
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will only happen if the console sends a malformed response and quite
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4. **Console Restart: Communication to console process reset**
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IVLE's TCP connection to the console process was reset. May indicate
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doc/man/faq.rst
