ServerCharlie servercharlie

How Node Resolves Dependencies

Read more about node_modules and how you can use them in official node/iojs docs:

If the module identifier passed to require() is not a native module, and does not begin with '/', '../', or './', then io.js starts at the parent directory of the current module, and adds /node_modules, and attempts to load the module from that location.

If it is not found there, then it moves to the parent directory, and so on, until the root of the file system is reached.

Here I show you how you can easily build a hierarchy of modules inside your project and use nested node_modules directories to manage dependencies within your application. This is a pretty good solution that doesn't require you to change NODE_PATH, use many git repositories or setting up a private registry.

Docker for beginners

Docker cheatsheet.

To get the list of commands:
```
  $ docker
```
To search for images in docker index:
```
  $ docker search tutorial
```

Speed Testing

@ http://www.spiffy.sg/it-pros/running-speed-test-ubuntu-server/

Installation & Usage

sudo -i
apt-get install speedtest-cli
speedtest-cli

JavaScript Crypto Libraries

I start with a list and plan to create a comparison table.

WebCryptoAPI

http://www.w3.org/TR/WebCryptoAPI/

This specification describes a JavaScript API for performing basic cryptographic operations in web applications, such as hashing, signature generation and verification, and encryption and decryption. Additionally, it describes an API for applications to generate and/or manage the keying material necessary to perform these operations. Uses for this API range from user or service authentication, document or code signing, and the confidentiality and integrity of communications.

	--log_gc (Log heap samples on garbage collection for the hp2ps tool.)
	type: bool default: false
	--expose_gc (expose gc extension)
	type: bool default: false
	--max_new_space_size (max size of the new generation (in kBytes))
	type: int default: 0
	--max_old_space_size (max size of the old generation (in Mbytes))
	type: int default: 0
	--max_executable_size (max size of executable memory (in Mbytes))
	type: int default: 0


	> why enable root login?
	> useful for dev purposes if you want instant sftp access.
	> you can revert these settings anyways in case you decide to go for production.

	sudo nano /etc/ssh/sshd_config

	> change PermitRootLogin prohibit-password
	> to PermitRootLogin yes


	- portal.azure.com has that latest features compared to manage.windowsazure.com
	- in portal.azure.com, you got two (2) deployment models: classic and resource-manager.
	- resources deployed in classic won't be compatible with those deployed in resource-manager, same thing vice-versa.

	on vm's, on opening ports:
	- opening ports on manage.windowsazure.com is MANUAL, one-by-one, through your vm's endpoints.
	- opening ports on portal.azure.com ALLOWS PORT RANGES, through your vm's network adapter's network security group.
	- you can manage both inbound and outbound in your network security group.
	- @ https://docs.microsoft.com/en-us/azure/virtual-machines/virtual-machines-windows-nsg-quickstart-portal


	sudo apt-get update

	sudo apt-get install mongodb

	sudo nano /etc/systemd/system/mongod.service

	> paste the shit below
	> change your 'User=' value to your preferred user
	> configure it with your dbpath & logpath


	> SSH Login to your home directory.

	> Get APT updates & upgrades.
	sudo apt-get update
	sudo apt-get upgrade

	> NodeJS & NPM
	> https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions
	> Installs the latest NodeJS & NPM, including the essential build tools (used by most packages).