1. Jaime Frey Computer Sciences Department University of Wisconsin-Madison jfrey@cs.wisc.edu http://www.cs.wisc.edu/condor Condor and Virtual Machines

2. www.cs.wisc.edu/condor Virtual Machines › Simulated hardware › Software in the VM thinks it’s running on a normal machine

3. www.cs.wisc.edu/condor Virtual Machines Real Machine Virtual Machines

4. www.cs.wisc.edu/condor Benefits of Virtual Machines › Job sandboxing › Checkpoint and migration › Jobs with elevated privileges › Platform independence

5. www.cs.wisc.edu/condor Job Sandboxing › Protect machines from jobs  Both accidental and malicious damage › Machine owners more willing to run unfamiliar jobs

6. www.cs.wisc.edu/condor Checkpoint and Migration › State of entire VM (OS and all) is recorded › VM can be checkpointed for…  Failure recovery  Migration to other machines

7. www.cs.wisc.edu/condor VM Checkpointing vs. Standard Universe › No relinking › Works with more types of jobs  Multiple processes and threads  Networking (but migration problematic) › No Remote IO  Must specify input files

8. www.cs.wisc.edu/condor Jobs with Elevated Privileges › Run as root or administrator user › Alter OS installation › Useful for automated testing of software like Condor

9. www.cs.wisc.edu/condor Platform Independence › Jobs can run on more machines › Machines can run more jobs › Linux jobs on Windows machines  And vice versa

10. www.cs.wisc.edu/condor Thank You › Any questions? › Virtualization in Condor BoF  Friday, 1:30-2:30