Dockerized NodeJS container app monitoring its own allocated CPU usage

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I want my containerized NodeJS app to be able to track its own CPU usage but don't find a way of doing it (all I found is to monitor the host cores usage). I don't want to use docker stats inside the container because it would need to run it in privilege mode.

docker node.js cpu-usage
1 Answers

I found the solution using:

  • @adobe/cgroup-metrics

  • CPU count gist (function getCpuLimits()): https://github.com/xiaoxiaojx/get_cpus_length/blob/master/index.js

    const cgroup = require('@adobe/cgroup-metrics');
const delay = ms => new Promise(_ => setTimeout(_, ms));

// **COPY PASTE HERE THE GIST FUNCTIONS**

const run = async () => {
  const cpu = cgroup.cpu;
  const cpuacct_usage = await cpu.usage();

  // Wait 1s
  await delay(1000);

  const cpuacct_usage2 = await cpu.usage();

  const calculateUsage = await cpu.calculateUsage(cpuacct_usage, cpuacct_usage2);

  console.log('calculatedUsage', calculateUsage / getCpuLimits());

  return run();
};

run();
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