= Deploying clusterpost

== Install the server package

1. Install https://github.com/creationix/nvm[nvm], node (v4.4.5^)

2. Install http://couchdb.apache.org/[couchdb]

3. Create a folder to store the clusterpost-server package

4. Install clusterpost-server

----
npm install clusterpost-server
----

5. Configure clusterpost-server

6. Update the design views.

----
NODE_ENV=production node migrateUp.js
----

7. Install and configure <<clusterpost-execution>>

8. Start the server.

=== Configuration

==== TLS to enable HTTPS (recommended)

You must either acquire a certificate or generate a selfsigned certificate by running the following commands:

----
openssl genrsa -out key.pem 2048
openssl req -new -key key.pem -out csr.pem
openssl req -x509 -days 365 -key key.pem -in csr.pem -out certificate.pem
----

Finally edit the paths for 'tls' in the configuration section.

==== clusterpost-provider (database):

Edit the data provider configuration for the couchdb instance (default config should work out of the box). 

Run the following command to test if you have a running couchdb instance

----
curl http://localhost:5984
----

You should see the following output:

----
{"couchdb":"Welcome","uuid":"b57a566769e70a49d251deac508ce1df","version":"1.6.1","vendor":{"version":"1.6.1","name":"The Apache Software Foundation"}}
----

==== Configure the nodemailer provider

This email account will be used to send a token to the user to reset the password in case they forgot it. 

Check https://github.com/nodemailer/nodemailer[nodemailer] for possible configurations

==== Generate random key for pasword encryption

An easy way to generate a random key is done by typing the command

----
openssl genrsa 128
----

Save this key in your configuration file. This is the key used to encrypt the password and save them in the DB. 

==== Executionservers:

Edit this field with the ssh configuration to connect to your computing grid.

You must generate a pair of private and public keys and be able to connect without entering a password.

'sourcedir' must point to the installation path of the 'clusterpost-execution' package.

To install this package follow the instruction in section <<clusterpost-execution>>.


==== Starting the clusterpost-server. 

During installation, a script 'index.js' was generated with the following code.

--------
require('clusterpost-server');

clusterpostserver.server.start(function () {
	clusterpostserver.server.log('info', 'Server running at: ' + clusterpostserver.server.info.uri);
});
--------

You can also add your own plugins to this Hapi server by adding them to the configuration file. Check the Hapi tutorial http://hapijs.com/tutorials/plugins to start developing a new extension.

Optionally, you can add your own plugin by registering the plugin to the server as an example, the plugin static is added to clusterpost-server

----
var clusterpostserver = require('clusterpost-server');


var plugin = {};
plugin.register = require("./static");
plugin.options = {};

clusterpostserver.server.register(plugin, function(err){
    if (err) {
        throw err; // something bad happened loading the plugin
    }

    clusterpostserver.server.start(function () {
	   clusterpostserver.server.log('info', 'Server running at: ' + clusterpostserver.server.info.uri);
	});
    
});

----

Start the server by running:

----
NODE_ENV=<production|test> node index.js
----

The parameter production or test will read from the configuration file generated.

Once you have started the server, visit http://localhost:8180/docs to check the API documentation for clusterpost


== [clusterpost-execution] Install clusterpost-execution 

This application must be deployed in your remote computing grid. 

1. Install https://github.com/creationix/nvm[nvm], node (v4.4.5^)

2. Create a directory to install clusterpost-execution

3. Install clusterpost-execution by running

----
npm install clusterpost-execution
----

=== Configuration

Edit the configuration with a path to store the data in the local machine and the IP of the machine running the clusterpost-server application. 

If you configure the clusterpost-server with an SSL certificate, you will need a copy of the certificate.

To retrieve the certificate from the server running clusterpost-server

----
openssl s_client -showcerts -connect localhost:8180 </dev/null 2>/dev/null | openssl x509 -outform PEM > certificate.pem
----

Where localhost:8180 must be changed by the IP address running clusterpost-server.

=== SSH Tunneling

If the machine running clusterpost-server app does not have a public IP address and is not visible from the computing grid, you can create an SSH tunnel by running:

----
ssh username@computinggrid -R 8180:localhost:8180
---

This will create a reverse tunnel from the machine that will allow communication from the clusterpost-execution to the clusterpost-server application.

==== Multiple login nodes. 

Frequently, a computing grid will have many login nodes. This poses a problem since the tunnel that we generated before will work only on the login node with the active tunnel. 
 
To solve this issue, create a connection to one specific login node and use this connection for all future process. 

Create a tunnel to a login node and then, use this tunnel to create the reverse tunnel. 

This can be achieved by running.

1. ssh -T -N -f username@computinggrid -L 2222:localhost:22

2. ssh -T -N -f username@localhost -R 8180:localhost:8180

This will ensure that we will always be connected to the same login node all the time and we the tunnel will be available.