Clear message

Upgrade, flask, sage 4.7, and ext4 filesystem

People: W. Stein, J. Grout, M. Hansen

Database

• If we stick with the filesystem: NEED a very fast filesystem that supports > 4 million inodes and > 32000 directories per directory, i.e., ext4. This is difficult because boxen and sage.math are both Ubuntu 8.10.

• Also, want to at a minimum have user and worksheet metadata stored in database so startup is faster.
• Could run the server in a virtual machine, which would support ext4. But are virtual machines fast enough these days? They weren't last year. This would be worth trying.
• Or stick with the filesystem (see below).

Filesystem Thoughts

• (mhansen is doing this) Fix the __worksheet object to not load everything. Scary stuff if you look at notebook.py.

• (mhansen) Write a script to prune the filesystem, e.g., deleting cell directories that are empty.
• (mhansen?) Make it so user directories are stored in a hierarchical way. E.g., home/_store/

Current Servers

• http://sagenb.org

• http://prep.sagenb.org

• http://tutorial.sagenb.org

• http://480.sagenb.org

• http://alpha.sagenb.org

• http://demo.sagenb.org

• http://demo2.sagenb.org

• http://nt.sagenb.org

• http://standalone.sagenb.org

• http://test.sagenb.org

• http://uw.sagenb.org

• http://flask.sagenb.org -- not upgraded

Backup Strategy

• ?

Untrusted User Code: must all be executed in a virtual machine

• ?

Monitoring

• Nagios -- investigate for monitoring

• Or extend this script: http://wstein.org/home/wstein/bin/watch.sage

Virtual Machines

• I tried install virtualbox 4 on sage.math and failed, due to the Linux source and Linux kernel being out of sync somehow. Probably just needs an upgrade and reboot.
• I am scared to upgrade virtualbox on boxen.math.
• The Virtualbox on boxen.math is somewhat unstable and very old.