ca-apm-probe/lib/find-container-id.js

CA APM Node.js Agent monitors real-time health and performance of Node.js applications

var logger = require("./logger.js");
const fs = require("fs");

var findContainerId = function () {
    try {
        // if this machine is docker
        if (require('is-docker')() || require('is-kubernetes')()) {
            var output = fs.readFileSync('/proc/self/cgroup', 'utf8');
            var lines = output.split('\n');

            for (var i = 0; i < lines.length; i++) {
                var line = lines[i];

                if (line) {
                    if(output.includes('containerd')){
                        line = line.substring(line.lastIndexOf(':') + 1, line.length);
                    } else {
                        line = line.substring(line.lastIndexOf('/') + 1, line.length);
                        // specific to older docker versions 1.12
                        line = line.replace(new RegExp('docker-', 'g'), '').replace(new RegExp('.scope', 'g'), '');
                    }
                    // is it full container id
                    if (line.length == 64) {
                        return line;
                    }
                }
            }
        }
    }
    catch (err) {
        logger.debug('error while finding container id: %s', err.message);
    }

    return null;
};

module.exports = findContainerId;