three minute cloud server illustration with node-control

gistfile1.js

/*global require */

// Illustration-only for a mailing list discussion - not a recommended pattern
// for production because of root usage. Untested.
// http://groups.google.com/group/nodejs/browse_thread/thread/b41ad5d727d8dff8

// usage example:
// node thisfile.js local server:create
// node thisfile.js local server:stop <IP>
// node thisfile.js local server:start <IP>

// or once cloudserver config is populated with one or more server IPs
// node thisfile.js cloudserver server:stop
// node thisfile.js cloudserver server:start

var cloudservers = require('cloudservers'),
    control = require('control'),
    task = control.task,
    sys = require('sys');

function createServer(serverName, username, apiKey, callback) {
    var options = {
        name: serverName,
        image: 49, // Ubuntu 10.04 (Lucid Lynx)
        flavor: 1 // 256 server
    };

    cloudservers.setAuth({ username: username, apiKey: apiKey }, function () {
        cloudservers.createServer(options, function (err, server) {
            server.setWait({ status: 'ACTIVE' }, 5000, function () {
                // Our server is now built and active, so we can install node.js on it
                sys.puts('Your server ' + serverName + ' is now ready.');
                sys.puts('    IP Address: ' + server.addresses.public);
                sys.puts('    Root password: ' + server.adminPass);
                if (callback) {
                    callback(server.addresses.public);
                } 
            });
        });
    });
}

var commands = 'apt-get update' +
    ' && apt-get install git-core build-essential libssl-dev' +
    ' && cd /usr/src' +
    ' && git clone http://github.com/ry/node.git' +
    ' && cd node' +
    ' && ./configure' +
    ' && make' +
    ' && make install' +
    ' && curl http://npmjs.org/install.sh | sh' +
    ' && cd /usr/src' +
    ' && git clone git://github.com/Marak/hellonode.git' +
    ' && cd hellonode' +
    ' && nohup node server.js';

task('local', 'Configuration for local host', function () {
    return control.hosts({}, [ '127.0.0.1' ]);
});

var config = {
    user: 'root'
};

task('server:create', 'create a cloud server', 
        function (serverName, username, apiKey) {
    var host;
    username = username || 'your-username';
    apiKey = apiKey || 'your-api-key';
    createServer(serverName, username, apiKey, function (ip) {
        host = control.hosts(config, [ip]).shift();
        sys.puts('Running commands as ' + host.user + '@' + host.address);
        host.ssh(commands); 
    });
});

task('server:start', 'start cloud server', function (host, ip) {

    // Usually, after you procured a server, you would create a new config task
    // with that ip (see cloudserver task following), but this allows passing
    // in the ip of the remote host as an argument to the task.
    if (ip) {
        host = control.hosts(config, [ip]).shift();
    }

    host.ssh('cd /usr/src/hellonode && nohup node server.js'); 
});

// See note inside task above
task('cloudserver', 'Configuration for procured server(s)', function () {
    return control.hosts(config, [ '<IP>' ]); // Enter actual IP(s) when known
});

task('server:stop', 'stop cloud server', function (host, ip) {
    if (ip) {
        host = control.hosts(config, [ip]).shift();
    }
    host.ssh('killall -9 node'); 
});

control.begin();