1. Multiprocessing and
runs continuously
2011-11-19
kumatch / Yosuke Kumakura
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2. • Yosuke Kumakura
• @kumatch
• Feedtailor inc.
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3. Agenda
• Multiprocessing
• Continue to run a script
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4. Today’s modules
• Cluster (for Node 0.6)
• forever
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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)
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6. Worker
process
Network
ports
Worker
process
Master process
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7. Cluster APIs
• fork()
• isMaster
• isWorker
• “death” event for worker die
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8. Cluster usage
• cluster.isMaster
• cluster.fork()
• cluster.isWorker
• ex. http.Server()
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9. Cluster usage
• Cluster worker is Child Process
• using child_process.fork()
• Built-in messaging channel
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10. Cluster for Node 0.4
• http://learnboost.github.com/cluster/
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11. forever
• https://github.com/nodejitsu/forever
• Run a script as a daemon
• CLI tool (and module instance)
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12. $ [sudo] npm install -g
forever
$ forever start app.js
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13. forever daemon actions
• start
• stop
• restart
• list
• and more...
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14. Node 0.6 + forever 0.7.2
= unstoppable !!!
• start is available
• list, stop and etc. don’t work
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