maiordomus

#Description Maiordomus is a command line application that allows to define multiple operation flows which can be executed locally or on one or many remote machines simultaneously. Check the project maiordomus-examples for real use case.

##Requirements To run it needs OpenSSH and node in the local machine and an OpenSSH server in the remote ones.

##Install npm install -g maiordomus

##Usage Maiordomus can be launched from the command line using the following arguments:

• environment, mandatory, used to select the environment to work on. Environment must exist in the config file.
• task, mandatory, used to choose wich task to perform on the given environment. Task must be defined in the maiordomus folder.
• step, optional, used to specify wich step to execute, otherwise all the steps will be in the way they are defined.

###Setup Maiordomus expects to find a maiordomus folder on the root of your project containing a configuration file called config.js and tasks files. Eg:

myAwesomeWebApp
----maiordomus
--------config.js
--------task.js
----server.js
----package.json

####Configuration file This is an example of a configuration file:

/* MaiorDomus configuration */
module.exports = {
    // List of all the possible vbariables used to enrich commands
    variables: {
        logMessage: 'Application deployed'
    },
    // List of all the possible environments
    environments: {
        staging: {
            // list of hosts that compose the environment
            host: ['staging'],
            // Username used to connect
            username: 'nodeuser',
            // Private key used for authentication
            privateKey: require('fs').readFileSync('/path/to/key'),
        },
    	// environment name
        production: {
        	// list of hosts that compose the environment
            host: ['production.01', 'production.02'],
            // SSH port used to connect
            port: 2222,
            // Username used to connect
            username: 'ec2-user',
            // Private key used for authentication
            privateKey: require('fs').readFileSync('/path/to/key'),
            // Define enviornment specif values for variables
            variables: {
                logMessage: 'Application deployed in production'
            }
        }
    }
};

####Tasks files Tasks are used to define one or more steps. Take a look at this simple task:

// Require maiordomus
var geoffrey = require('maiordomus');

// Start defining the task and its steps sequentially
geoffrey
    // first step
    .step(
        'StopApplication', // Step name
        [ stopApplication ] // List of step actions
    ).step(
        'CleanAndStart', // Step name
        [ cleanLogs, startApplication ] // List of step actions
    );

// Function used in steps
function startApplication() {
    var maiordomus = this;
    maiordomus
        .connect()
        .exec('service myApp start')
        .done('<%= logMessage %>');
}

function stopApplication() {
    var maiordomus = this;
    maiordomus
        .connect()
        .exec('service myApp stop')
        .done();
}

function cleanLogs() {
    var maiordomus = this;
    maiordomus
        .connect()
        .exec('rm -f /logs/myApp/*.log')
        .done();
}

//Export the task
module.exports = geoffrey;

The task is pretty self explanatory, check this repo for more real use cases. Actions need to use the Maiordomus API to let the main application manage the steps and the actions flow in the right order; done must be called always at the end of each action.

####Templating Maiorodmus uses the lodash template syntax to enrich logs and commands passed to its API. It uses properties coming from the configuration.variables object extended with environment specific variables object.

##API Currently Maiordomus provides different API if it's used inside an action or inside the body of a task. Inside a task it just provides the step method that allow you to define a list of steps, all the other methods are available inside actions.

• step (stepName, actions), defines a step of the task. Every step needs to have a name and a list of one or more actions defined.
• log (message), output message on the current console.
• connect (logMessage), opens an SSH connection to all the hosts configured for the current environment. If logMessage is passed it will be printed before starting the connection attempt.
• disconnect (logMessage), close all the current SSH connections opened with the current environment hosts. If logMessage is passed it will be printed before starting the disconnect attempt.
• exec (command), execute the given command on the remote machines or on the local one if no connections are openend. Eg:

function mixedExecute() {
    var maiordomus = this;
    maiordomus
        // executed locally
        .exec('ls -la /var/wwww')
        .connect()
        // executed remotely
        .exec('ls -la /var/www')
        .disconnect()
        // executed locally
        .exec('ls -la /var/www')
        .done();
}

• get (remotePath, localPath, logMessage), downloads a remote file located in a remotePath to localPath using an SFTP connection. If logMessage is passed it will be printed before the download attempt.
• put (localPath, remotePath, logMessage), uploads a local file located in localPath to remotePath on remote machines. If logMessage is passed it will be printed before the download attempt.
• done (logMessage), closes the current action flow. Must be called in order to let Maiordomus know that the flow is terminated. If logMessage is passed it will be printed instead of the default Done message.