Linux in the Accelerator Division Jim Smedinghoff Linux User Group Jan 28 2015 1/28/2015Smedinghoff | Linux in the Accelerator Division1.

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Presentation transcript:

Linux in the Accelerator Division Jim Smedinghoff Linux User Group Jan /28/2015Smedinghoff | Linux in the Accelerator Division1

Linux in the Accelerator Division AD is a medium sized Linux user (~500 nodes) Lots of servers, a few desktops Many open source services in use: –NFS –Apache –Tomcat –MySQL –PostgreSQL –Samba –Amanda –RabbitMQ 1/28/2015Smedinghoff | Linux in the Accelerator Division2

Linux in the Accelerator Division (cont) Compute cluster used by the Accelerator Physics Center Electronic log book Safety system displays Various embedded systems Miscellaneous other things… Accelerator Control System 1/28/2015Smedinghoff | Linux in the Accelerator Division3

Accelerator Controls Biggest user of Linux in AD (~250 nodes) Nervous system of the accelerators and beam lines Evolves with the needs of the accelerators Historically ran on proprietary DEC hardware and VMS Currently on commodity Intel hardware and Scientific Linux In the process of converting from 32-bit SLF5 to 64-bit SLF6 Minor Application protected by firewall –No direct access to internet –Accessed through gateway nodes 1/28/2015Smedinghoff | Linux in the Accelerator Division4

Accelerator Control System Overview Application Central Front-End 1/28/2015Smedinghoff | Linux in the Accelerator Division5 Console Applications Central Services IRM Front-Ends Java Applications Web Applications MOOC Front-Ends LabVIEW Front-Ends Open Access Clients Field Hardware ServletsDatabase Linux Front-Ends

Controls Front-Ends Interface field hardware to the control system Many front-ends (~600) Most use a commercial OS such as VxWorks or PSOS Newest generation is using Linux Small but increasing number of Linux front-ends –Run on a mix of specialized hardware and commodity servers –Some use Scientific Linux –Some use custom real-time Linux 1/28/2015Smedinghoff | Linux in the Accelerator Division6

Controls Central Layer 130 Linux nodes Databases Data loggers & archivers NFS File services Web and Tomcat services for web apps Samba for desktop access to controls data Data acquisition messaging services Software Front-Ends Alarms monitoring 1/28/2015Smedinghoff | Linux in the Accelerator Division7

Controls Applications 80 application servers (Linux) Many applications (~700) Large investment in creating and testing applications Frequently written by part time programmers (accelerator experts, operators) Console applications –C/C++, use X protocol Java applications –Run on Linux servers, display over X, or... –Run on user’s desktop, use central services for data Web applications –Use central services for data 1/28/2015Smedinghoff | Linux in the Accelerator Division8

Final Thoughts Scientific Linux is a good fit for AD applications Some things we like about it: –Long term support and stability –Automatic security updates –Not too bleeding edge –Lots of open source software packaged for it –The community of users Questions? 1/28/2015Smedinghoff | Linux in the Accelerator Division9