View source for FAQ - Mod 6

Welcome to the frequently asked questions page for Module 6. As many common questions can come up on Piazza, some of those questions are consolidated here.

== Setup/Logistics ==

=== Should I use a database for Module 6? ===
You can store everything locally in this module. No need to use a database.

=== How can I add an image to my instance? SFTP isn't working ===
There are a couple different ways to load an image onto your instance. One of the easiest is to use wget. When logged into your instance, run the following command in the terminal:

<source lang=bash>
$ wget <imageurl>
</source>

Running this command will download the image straight onto your instance!

== NPM/Mime ==
There are a couple common errors that students run into when setting up their Node.js. One of the most common looks like this

<source lang=bash>
ENOENT: no such file or directory, open 'home/rlav/package.json'
</source>

The specific path may differ for your personal machine, but any path that ends in "package.json" in this error is likely a result of the same problem.

This is another common error message: 

<source lang=bash>
Cannot find module 'mime' error when running static_server.js
</source>

Both of these errors are a result of not setting up the package.json correctly. In fact, both are usually a result of not creating package.json at. After installing Node.js, you '''must''' run the following command to generate the package.json file.

<source lang=bash>
$ npm init
</source> 

After generating the package.json file, you must write the correct dependencies. '''Details on this are specified at the [[Node.JS]] page'''. If you follow everything on this page correctly, you should be able to set up Node.js rather smoothly.

== Port 3456 ==

=== What rule should I define for Custom TCP when setting up port 3456? ===
When setting up the Custom TCP rule for port 3456, it's fine to use the default source of 0.0.0.0/0. The rule will look like this:

Custom TCP 3456 Custom 0.0.0.0/0

=== How do I access my instance at port 3456? ===
All you have to do is append :3456 to the end of your instance url. Thus, the link would just be http://ec2-xx-xxx-xx-xxx.us-east-2.compute.amazonaws.com:3456/filepath 

[[Category: Module 6]]