Monitors memcached on 52Poké server, restart memcached when it's using too much CPU resource.

monitor_memcached.js

var exec = require('child_process').exec,
    fs = require('fs');

var errorCount = 0;

function getCPU(callback){
    exec('top -b -n 1 -p `pgrep memcached`', function(error, stdout, stderr){
        var lines = stdout ? stdout.split('\n') : [''],
            str = lines[lines.length - 1].substring(47, 52);

        if (str) {
            callback(parseFloat(str));
        } else {
            callback(-1);
        }
    });
}

var monitor = function(){
    getCPU(function(result){
        if (result == -1) {
            fs.appendFileSync('/home/52poke/logs/monitor.log', new Date().toString()+' Memcached error.\n');
        } if (result < 20) {
            errorCount = 0;
        } if (result > 35) {
            fs.appendFileSync('/home/52poke/logs/monitor.log', new Date().toString()+' Memcached warning, CPU ' + result +'%.\n');
            errorCount++;
            if (errorCount >= 5) {
                fs.appendFileSync('/home/52poke/logs/monitor.log', new Date().toString()+' Memcached killed.\n');
                exec('killall memcached', function(error, stdout, stderr){
                    setTimeout(monitor, 10000);
                });
                return;
            }
            setTimeout(monitor, 5000);
            return;
        }
        setTimeout(monitor, 10000);
    });
};

fs.appendFileSync('/home/52poke/logs/monitor.log', new Date().toString()+' Monitor started.\n');
monitor();