[Node] Multiprocessing and runs continuously
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The document discusses using the Cluster and forever modules in Node.js. Cluster allows creating worker processes to improve scalability. The master process forks worker processes, and they communicate via internal messaging. Forever runs Node.js scripts continuously in the background as daemons. While Cluster and forever are useful individually, there are currently issues using the latest versions together due to API changes.
![$ [sudo] npm install -g
forever
$ forever start app.js
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[Node] Multiprocessing and runs continuously
- 1. Multiprocessing and runs continuously 2011-11-19 kumatch / Yosuke Kumakura 11 11 19
- 2. • Yosuke Kumakura • @kumatch • Feedtailor inc. 11 11 19
- 3. Agenda • Multiprocessing • Continue to run a script 11 11 19
- 4. Today’s modules • Cluster (for Node 0.6) • forever 11 11 19
- 5. Cluster • Includes version 0.5.10 • committed on Oct. 12, 2011 • adds CLI option first. • Shift to module (Oct. 27, 2011) • removed CLI option. • Bump v 0.6.0 (Nov. 4, 2011) 11 11 19
- 6. Worker process Network ports Worker process Master process 11 11 19
- 7. Cluster APIs • fork() • isMaster • isWorker • “death” event for worker die 11 11 19
- 8. Cluster usage • cluster.isMaster • cluster.fork() • cluster.isWorker • ex. http.Server() 11 11 19
- 9. Cluster usage • Cluster worker is Child Process • using child_process.fork() • Built-in messaging channel 11 11 19
- 10. Cluster for Node 0.4 • http://learnboost.github.com/cluster/ 11 11 19
- 11. forever • https://github.com/nodejitsu/forever • Run a script as a daemon • CLI tool (and module instance) 11 11 19
- 12. $ [sudo] npm install -g forever $ forever start app.js 11 11 19
- 13. forever daemon actions • start • stop • restart • list • and more... 11 11 19
- 14. Node 0.6 + forever 0.7.2 = unstoppable !!! • start is available • list, stop and etc. don’t work 11 11 19