====== Node.js Installation ======

As always, we'll start from a [[:vms:debian|Debian template]].\\
We'll refer to [[http://yoember.com/nodejs/the-best-way-to-install-node-js/|this article]], stating it's the best way to install Node.js !

===== Create User =====

We'll first create a ''dev'' user that is going to be part of the ''sudoers'' group ([[https://www.digitalocean.com/community/tutorials/how-to-create-a-sudo-user-on-ubuntu-quickstart|DigitalOcean reference]]).

<Code>
> adduser dev
...
Enter new UNIX password: 
Retype new UNIX password: 
...
> usermod -aG sudo dev
</Code>


===== Install NVM (Node Version Manager) =====

**NOTE:** the following commands will be executed as ''dev'' user.
==== Run the Install Script ====

Check [[https://github.com/creationix/nvm#install-script|the NVM GitHub repo]] for the latest version of the script.

<Code>
> wget -qO- https://raw.githubusercontent.com/creationix/nvm/v0.33.4/install.sh | bash
=> Downloading nvm as script to '/root/.nvm'

=> Appending nvm source string to /root/.bashrc
=> Appending bash_completion source string to /root/.bashrc
=> Close and reopen your terminal to start using nvm or run the following to use it now:

export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion
</Code>

In case you'd like to better grasp what the script exactly does, and what files it involves, you can refer to [[https://github.com/creationix/nvm#manual-install|https://github.com/creationix/nvm#manual-install]]

==== Choose the Node.js Version to Install ====

First you can **list the installed Node.js** versions:
<Code>
> nvm list
nvm list
            N/A
node -> stable (-> N/A) (default)
iojs -> N/A (default)
</Code>

Next you can **list the available Node.js versions**:
<Code>
> nvm ls-remote
        v0.1.14
        v0.1.15
        v0.1.16
        v0.1.17
        ...
        ...
         v7.9.0
        v7.10.0
         v8.0.0
         v8.1.0
         v8.1.1
         v8.1.2
</Code>

The list being very long, it is possible to reduce the output using something like: ''$ nvm ls-remote | tail -n9'' to only display the last 9 versions or ''$ nvm ls-remote | grep "v7"'' to only view version 7...

==== Install NVM Version and Set Default ====

<Code
> nvm install 7.10.0
</Code>

When you have many Node.js versions, change the default with:
<Code>
> nvm use 8.0.0
> nvm alias default 8.0.0
</Code>

To check the current default version:
<Code>
> node -v
</Code>

==== Upgrade NPM to the Last Version ====

<Code>
> npm -v
4.2.0

> npm install -g npm
> npm -v
5.0.3
</Code>

==== Increases the Amount of inotify Watches ====

<Code>
> echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
</Code>