Clustering with Node.js

Let's talk about clustering in Node.js, process clustering using the Node.js cluster module and Container Clustering using Docker and Kubernetes.

6. var app = require('express')()
app.get('/ping', function(req, res) {
res.send('pong!')
})
module.exports = app

7. var cluster = require('cluster')
var app = require('./server')
if (cluster.isMaster) {
var numCPUs = require('os').cpus().length
for (var i = 0; i < numCPUs; i++) {
cluster.fork(process.env)
}
} else {
app.listen(process.env.PORT)
}
var app = require('express')()
app.get('/ping', function(req, res) {
res.send('pong!')
})
module.exports = app

8. var cluster = require('cluster')
var app = require('./server')
if (cluster.isMaster) {
var numCPUs = require('os').cpus().length
for (var i = 0; i < numCPUs; i++) {
cluster.fork(process.env)
}
} else {
app.listen(process.env.PORT)
}
var app = require('express')()
app.get('/ping', function(req, res) {
res.send('pong!')
})
module.exports = app

9. var cluster = require('cluster')
var app = require('./server')
if (cluster.isMaster) {
var numCPUs = require('os').cpus().length
for (var i = 0; i < numCPUs; i++) {
cluster.fork(process.env)
}
} else {
app.listen(process.env.PORT)
}
var app = require('express')()
app.get('/ping', function(req, res) {
res.send('pong!')
})
module.exports = app

10. var cluster = require('cluster')
var app = require('./server')
if (cluster.isMaster) {
var numCPUs = require('os').cpus().length
for (var i = 0; i < numCPUs; i++) {
cluster.fork(process.env)
}
} else {
app.listen(process.env.PORT)
}
var app = require('express')()
app.get('/ping', function(req, res) {
res.send('pong!')
})
module.exports = app→

11. var cluster = require('cluster')
var app = require('./server')
if (cluster.isMaster) {
var numCPUs = require('os').cpus().length
for (var i = 0; i < numCPUs; i++) {
cluster.fork(process.env)
}
} else {
app.listen(process.env.PORT)
}
→
var app = require('express')()
app.get('/ping', function(req, res) {
res.send('pong!')
})
module.exports = app→

12. var cluster = require('cluster')
var app = require('./server')
if (cluster.isMaster) {
var numCPUs = require('os').cpus().length
for (var i = 0; i < numCPUs; i++) {
cluster.fork(process.env)
}
} else {
app.listen(process.env.PORT)
}
→
→
var app = require('express')()
app.get('/ping', function(req, res) {
res.send('pong!')
})
module.exports = app→

13. var cluster = require('cluster')
var app = require('./server')
if (cluster.isMaster) {
var numCPUs = require('os').cpus().length
for (var i = 0; i < numCPUs; i++) {
cluster.fork(process.env)
}
} else {
app.listen(process.env.PORT)
}
→
→
→
var app = require('express')()
app.get('/ping', function(req, res) {
res.send('pong!')
})
module.exports = app→

14. var cluster = require('cluster')
var app = require('./server')
if (cluster.isMaster) {
var numCPUs = require('os').cpus().length
for (var i = 0; i < numCPUs; i++) {
cluster.fork(process.env)
}
} else {
app.listen(process.env.PORT)
}

15. var cluster = require('cluster')
var app = require('./server')
if (cluster.isMaster) {
var numCPUs = require('os').cpus().length
for (var i = 0; i < numCPUs; i++) {
cluster.fork(process.env)
}
} else {
app.listen(process.env.PORT)
}
cluster.on('exit',
function (worker, code, signal) {
cluster.fork(process.env)
}
)

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8pi87MaI5eUE

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