pm2 的集群模式示例

mkdir myapp
touch server.js

const http = require("http");
http.createServer((req, res) => {
res.writeHead(200);
res.end("server endpoint hit");
console.log(`got new connection on port ${req} ${process.pid}`)
}).listen(13002);

启动9个实例
pm2 start server.js -i 9

ps -ef | grep node
root      3320 32331  0 Nov16 ? 00:00:03 node /root/study/nodejs/myapp/index.js
root      3510 32331  0 00:08 ? 00:00:01 node /root/study/nodejs/server_app/server.js
root      3517 32331  0 00:08 ? 00:00:01 node /root/study/nodejs/server_app/server.js
root      3524 32331  0 00:08 ? 00:00:01 node /root/study/nodejs/server_app/server.js
root      3531 32331  0 00:08 ? 00:00:01 node /root/study/nodejs/server_app/server.js
root      3542 32331  0 00:08 ? 00:00:01 node /root/study/nodejs/server_app/server.js
root      3553 32331  0 00:08 ? 00:00:01 node /root/study/nodejs/server_app/server.js
root      3564 32331  0 00:08 ? 00:00:01 node /root/study/nodejs/server_app/server.js
root      3575 32331  0 00:08 ? 00:00:01 node /root/study/nodejs/server_app/server.js
root      3586 32331  0 00:08 ? 00:00:01 node /root/study/nodejs/server_app/server.js

pm2 ls查看 mode 为cluster


验证访问是否打到不同的进程
用pm2 log server 查看日志如下
2|server  | got new connection on port [object Object] 5421
3|server  | got new connection on port [object Object] 5422
4|server  | got new connection on port [object Object] 5435
5|server  | got new connection on port [object Object] 5441
6|server  | got new connection on port [object Object] 5449
7|server  | got new connection on port [object Object] 5455


curl多次访问如下
curl -is localhost:13002 

增加多进程监听多端口模式，主要是该字段起作用 increment_var : 'PORT'

module.exports = { apps : [ { name: "myapp", script: "./app.js", instances: 2, exec_mode: "cluster", watch: true, increment_var : 'PORT', env: { "PORT": 3000, "NODE_ENV": "development" } } ] }

见：pm2.keymetrics.io/docs/usage/environment/