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Integration of Version Control and Code Migration Processes Chapter 3 – Evolution

Integration of Version Control and Code Migration Processes Chapter 3 – Evolution. JA-SIG - December 4, 2006 - Atlanta, GA Jim Thompson Division of Information Technology University of Wisconsin – Madison https://mywebspace.wisc.edu/jfthomps/vc. University of Wisconsin - Madison.

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Integration of Version Control and Code Migration Processes Chapter 3 – Evolution

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  1. Integration of Version Control and Code Migration ProcessesChapter 3 – Evolution JA-SIG - December 4, 2006 - Atlanta, GA Jim Thompson Division of Information Technology University of Wisconsin – Madison https://mywebspace.wisc.edu/jfthomps/vc

  2. University of Wisconsin - Madison • public land-grant university (est. 1848) • home of the Badgers • Big Ten conference (11 with Penn State) • over 40,000 students • among top 5 in USA for research funds • #1 large school for Peace Corps volunteers • Madison is the capital of Wisconsin JA-SIG 12/4/2006

  3. My work group • part of Division of Information Technology • we design, build, acquire, install and support Internet infrastructure applications (a.k.a. upper middleware) • E-mail • Calendar • My WebSpace (see http://www.educause.edu/apps/eq/eqm05/eqm0548.asp) • Portal JA-SIG 12/4/2006

  4. Today’s presentation • Background info on our portals • Epicentric (simple design = simple migrations) • Regular vs. environment-specific tags in CVS • Ported A-B-C design for a Cobol developer (2003) • Documented how to build an automated process • uPortal (design got more interesting) • Maps to locate config files • Improved automation for processing maps • Modernized process for a Cobol developer (2006) • Maybe some of this can work for you JA-SIG 12/4/2006

  5. My UW-Madison (our portal) https://my.wisc.edu provides access to • E-mail • Calendar • My WebSpace • Application status and Enrollment • Financial Aid • Classes on the web (Learn@UW) • Course/Advisor/Instructor/Teaching Resources • Grades (entry and review) • Demo Accounts (Student & Instructor/Advisor) JA-SIG 12/4/2006

  6. Some My UW-Madison statistics • September 2003 – over 1.3 million logins • Over a million logins/month thru May 2004 • September 2004 (new usage records) • Over 1.85 million logins by 49,900+ users • September 2, 2004 (first day of instruction) • 85,739 logins by 29,676 users • About 6,000 users during lunch hour • September 2005 (new UW home page) • Over 1.5 million logins by 51,000+ users JA-SIG 12/4/2006

  7. My UW–Madison - some lingo • MUM = My UW–Madison • MUMMI = module inventory • MUMMR = migration request • MUMsters = developers • mumdev = development/test box (Solaris) • 4 qa + 8 prod servers named after mummies JA-SIG 12/4/2006

  8. MUM Service Goals • 24x7 availability (but not all connected systems are always up) • Handle peak traffic without slowing down • Good response time from called servers • Minimize outages (frequency & duration) • Weekly updates of production • How are we doing? JA-SIG 12/4/2006

  9. Production updates • All portal code is on our servers • Prefer weekly releases • Prepare a staging machine (Monday PM) • Deploy early Tuesday (between 5 & 7 AM) • Prefer “rolling restarts” to avoid outages JA-SIG 12/4/2006

  10. JA-SIG 12/4/2006

  11. Paths to production & demo • App files migrate thru 6 environments • Development • Test • QA • Production • Testdemo • Demo • 1,000+ files in each environment JA-SIG 12/4/2006

  12. Overview of environments • Development • the Wild West • CVS available, but not required • Test and Testdemo • Files must go thru CVS to get to test/testdemo • Developers apply test & testdemo tags in CVS • Update Mon-Fri 4 & 4:20 AM and “right now” • All test migrations stop/restart test JA-SIG 12/4/2006

  13. Overview of environments • QA • Files flow thru CVS • Developers request migration via MUMMR • Run load tests here (for about a week) • Production • Files flow thru CVS • Demo • Files flow thru CVS • Nearly as important as production JA-SIG 12/4/2006

  14. Files flow thru CVS • Question: How do we control the flow? • How to mark a file for promotion? • How to know what files got promoted… • Which version? • Where? • When? • Answer: CVS tags • Drive the process • Indicate what’s where, since when JA-SIG 12/4/2006

  15. Some old CVS tags JA-SIG 12/4/2006

  16. CVS tag maintenance • Who maintains which tags? • Developers apply and move test/testdemo tags • MUM admins apply qa, prod, demo tags • Scripts apply and move in and outa tags • Scripts create update history tags • What’s the purpose of the outa tags? • Track deletes (like adds and changes) • Encourage developers to clean up • Avoid permanent loss of old code (in Attic) JA-SIG 12/4/2006

  17. JA-SIG 12/4/2006

  18. Why a MUMMR? • Reproducible instructions • QA is where we test the MUMMR • Complete list of files? • Clear instructions? • If we find problems, fix & resubmit MUMMR • Increase odds of successful production move • Documentation • Tell Help Desk and others what’s coming JA-SIG 12/4/2006

  19. Files flow JA-SIG 12/4/2006

  20. CVS tags - Who cares? • Developers • Where’s my code? • Project Managers • Which version was installed where and when? • Migration Controllers • What’s scheduled to move? • Everyone • What’s the difference between X and Y? JA-SIG 12/4/2006

  21. How comparing tags can help • Preparing to update 100+ production files • Apply prod tags according to MUMMR • Refresh export of files tagged prod • Compare inqa and prod • If all files are moving, there should be no diffs • All differences should be examined • Partial migrations are opportunities for problems • Developers can use same technique • Compare intest and inqa to get MUMMR right JA-SIG 12/4/2006

  22. That’s the main story, but… • Environmental files • DB config settings, log verbosity, etc. • permanently branched in CVS (never merged) • many branches for Epicentric’s properties.txt • convert: Tomcat to WebSphere to WebLogic • often had 5 to 8 active Epicentric environments • now support 8 uPortal environments • Automated updates of environmental files JA-SIG 12/4/2006

  23. Some environmental branches • my-predev-tc-under (framework development) • my-dev-tc-mumdev • my-dev-tc-jh9 • my-test-tc-mumdev • my-testdemo-tc-mumdev • my-qa-tc-qa • my-prod-tc-prod • my-demo-tc-glow • 19 Epicentric/Vignette branches (RIP) JA-SIG 12/4/2006

  24. Controls in CVS • Regular application files • tag changes limited via CVS filter (taginfo) • Environmental files • anyone can grab a branch • commits trigger e-mail notice to MUM admins • commits on my-dev or my-test branches are OK • commits on other branches, if not by MUM admins, may cause questions JA-SIG 12/4/2006

  25. Updates were simple as A-B-C • A = app; B = bin; C = config • Epicentric had config files in one directory • Update script was simple • cd $APPDIR • cvs update –r $REGTAG (e.g., test, qa, prod) • cd $CONFIGDIR • cvs update –r $ENVTAG (e.g., my-…) • Simple design yields a simple solution JA-SIG 12/4/2006

  26. Cloned this solution in 2003 • We built a similar system for a COBOL app • CVS repository and app on AIX • 6 files in production app directory • Forced Cobol app into A-B-C design • Symlink (app to config) for Cobol compiler • Contents of document aimed at 3 audiences • Managers (General Overview ~ 17 pages) • Designers (Design Decisions ~ 5 pages) • Implementers (Details & Example Scripts ~ 30 pages) JA-SIG 12/4/2006

  27. Samples from “old” document • Our CVS taginfo filter calls tagcheck.pl • tagcheck.pl lets admins change any tag • How do we know tagcheck.pl is working? • see S.220 for test plan • brief primer on basics of CVS - G.040 • blank MUMMR – X.110 https://mywebspace.wisc.edu/jfthomps/vc/intvc JA-SIG 12/4/2006

  28. Moved to uPortal • What changed and what didn’t? • Good bye, Makefiles… Hello, ant • Basic CVS tags and processes continue • Simpler shell scripts; more complex build.xml • cvs-update.xml (build.xml) calls cvs-logntag.pl • Some new tags for uPortal frameworks • New (optional) milestone tags • Reports to find and compare tags JA-SIG 12/4/2006

  29. uPortal frameworks in CVS • Import vendor files on vendor branch • Separate vendor branch for each vendor • Keep our local modifications on trunk • CVS tags to identify and control • Vendor releases (Vup2-5-1) • Our local customizations (Rdev2-5-1) • Releases for our environments (Rdev, Rtest…) • https://mywebspace.wisc.edu/jfthomps/vc/CVS_up.html JA-SIG 12/4/2006

  30. JA-SIG 12/4/2006

  31. Tags for our frameworks • Rdev2-5-1  my-uppredev… (fwk dev) • Rdev  my-updev… (shared dev) • Rtest  my-uptest… • Rtestdemo  my-testdemo… • Rqa  my-upqa… • Rprod  my.wisc.edu • Rdemo  my-demo… JA-SIG 12/4/2006

  32. More CVS tags JA-SIG 12/4/2006

  33. Major families of uPortal tags • Regular (app) tags • test, testdemo, qa, prod, demo • status (in, outa), update history and milestone tags • Framework tags • Vup2-5-1, Rdev2-5-1, Rdev, Rtest, Rqa, Rprod, etc. • Rxx status (in, outa), update history and milestone tags • Environment branches (everywhere) • my-dev-tc-mumdev, my-test-tc-mumdev, etc. • also have status (in, outa) and milestone tags JA-SIG 12/4/2006

  34. Which tags are used where? • Milestone tags are optional (0, 1 or 2) • Status tags are optional • Update history tags are optional • Custom blends are feasible • Private (e.g., desktop/laptop) development • Update with prod (or qa) code for 90% of files • Update to HEAD where you’re working • Controlled chaos JA-SIG 12/4/2006

  35. Finding uPortal environment files • Beyond A-B-C of Epicentric days • All over the place • in uPortal framework • in portlets • in batch directories • in admin directories • Listed in map-cvs-branched-env-files.xml(maps found in multiple locations) JA-SIG 12/4/2006

  36. Updating environment files • Initially - targets within cvs-update.xml • Find and parse each map-cvs-branched-env-files.xml • Using 2 XSL style sheets, build and run cvs updates for each mapped file and directory (using supplied ENV branch) – Thanks, Bruce! • Now – perl script cvs-use-maps.pl does the job • More robust with more functions (updates and tags) • Detects problems and recovers when possible • Run from ant (cvs-update.xml) or shell scripts JA-SIG 12/4/2006

  37. Our busy Ant build.xml • Major targets of cvs-update.xml • help • status (verbose - also run by each update) • updateApp • updateFwk • updateAll • Main parameters of cvs-update.xml • several to specify, skip or set CVS tags JA-SIG 12/4/2006

  38. Some uPortal updates • Predev (for framework development) • updateAll–Dfwktag=Rdev2-5-1 –Dregtag=qa … • Dev (release new framework) • updateFwk–Dfwktag=Rdev –DmodFwkTags=y … • Test (usual test code update) • updateApp–Dregtag=test –DmodRegTags=y … JA-SIG 12/4/2006

  39. Typical test update • Developer (or cron) runs update script • Script tees output and e-mails scanner • Scanner (via procmail) parses output • Puts copy of raw output (~160k) on the web • Builds HTML copy (anchor tags each problem) • Builds HTML summary (2k map) on the web • Mails summary (map) of results to developers • Thank you, Curt! • Update creates verbose CVS status report JA-SIG 12/4/2006

  40. How to track herds of CVS tags • Parse the verbose CVS status reports • Also tracked Epicentric/Vignette files • cvs-show-tags.pl finds and counts tags • Defaults to not showing Update History tags • Can include branch names (or all tags) • cvs-diff-tags.pl compares 2 tags/branches • Option to show CVS revs of updated files • Summary of all changed files JA-SIG 12/4/2006

  41. How might you try this? • Old Make-based methods are documented • for an A-B-C design (separate Apps & Config) • shell scripts and some perl • Newer Ant/Make-based methods work • earlier documents are still relevant • maps locate environment (config) files • shell scripts, cvs-update.xml and some perl • Available via links (here + mywebspace…) JA-SIG 12/4/2006

  42. What about subversion? • Some folks use and like it a lot • Repeatedly moving tags in svn is tedious • Our 2-phase multi-tag scheme is a challenge • Starting to explore options… • Others with svn experience? • Maybe a Version Control BoF? • Maven on the horizon - in uPortal3… JA-SIG 12/4/2006

  43. Questions ??? https://mywebspace.wisc.edu/jfthomps/vc “Prediction is difficult, especially about the future.” – Yogi Berra JA-SIG 12/4/2006

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