DigitalOcean Setup Guide

This is a guide primarily written for DevMountain students. Its focus is on setting up a new droplet to run a Node (or MEAN-stack) app. This process is moderately time-consuming. Expect to spend an hour or so the first time you do this. After that, you can always take backups and/or snapshots. I believe backups are $1 a month from DO. Many of these steps can apply to other VPS services (Amazon Lightsail, etc.).

If you need https, read this

SSH

First check to see if you already have a public key. ls ~/.ssh
If you see a file that ends in pub (id_rsa.pub or id_dsa.pub), you're good; skip to the next section. If not:
ssh-keygen -t rsa -C "your@email.com" (substituting your own email, obviously).
This will be a short interactive process. You can decide whether or not you'll want a passphrase.
After this, cat ~/.ssh/id_rsa.pub and copy that (on Linux, cat ~/.ssh/id_rsa.pub | xclip -selection clipboard).
- You'll want the entire thing, starting with ssh-rsa and ending with your@email.com
Additional guides:
- for mac/linux/bsd/unix/sunos/solaris users
- for windows users

Digital Ocean

Sign Up at DigitalOcean
- This is a referral link. (You get $10 credit, I get $25 credit when you spend $25. Everyone wins!)
Click 'Create Droplet', then the 'One-click Apps' tab.
Select the MEAN-stack droplet (on Ubuntu).
Go with the $5 option.
Pick a location (my droplets are on NY2, but it really doesn't matter unless you're serving something huge).
Create it! Add your ssh keys. If you don't have ssh keys set up yet, go back to the first section.
- Just paste the whole thing (starting with ssh-rsa and ending with your@email.com) in the textarea you see when you click SSH Keys > Add SSH Key.
Then ssh root@dropletIPaddress.
Update /etc/apt/sources.list and /etc/apt/sources.list.d.
- Break them out however you like. my total list is at the bottom of this file.
Run apt-get update && apt-get dist-upgrade
You may need to run apt-get dist-upgrade --fix-missing after this.
- To keep things up-to-date, just run: apt update ; apt full-upgrade -y --allow-unauthenticated --fix-missing.
apt-get install anything else you might need. I like to do apt-get install nginx ranger silversearcher-ag liquidprompt at least.
I like to copy over my configs, which i keep in a repo on github, so it's as easy as cloning that repo down. Then you just need to reload the shell, so . ~/.bash_profile or . ~/.bashrc.
You may want to add a non-root user. That's up to you and/or your team. That'd be adduser username groupname.
- If you do this, do some research first on managing user permissions on Linux! At the very least you'll want to add that user to sudoers, set things up so you can SSH in as that user, and probably do something like (as root, or with sudo) chown -R username /usr/local.
npm i -g n ; n latest ; npm i -g npm to get the latest node and npm
Then install any other global node modules you might need. I recommend npm i -ging these:
- forever and pm2 serve the same purpose: keeping your Node apps running.
- bower and babel-cli should be obvious.
- vtop is a great little top/htop-like visual monitoring tool.
- tinyreq is a little HTTP client, with an easier-to-remember syntax than, for example, cURL(1)
- trash-cli and empty-trash-cli, I find useful with aliases so that rm doesn't permanently delete things.
  - alias rm='trash' and alias erm='empty-trash', for example.
- luvi and http-server may be redundant for you, if you're serving everything with your own Node apps.
  - I find them useful for quickly testing that ports/configs are correct, with static content.
- evilscan is a port scanner.
- faucet, tape, and tap are testing modules.
If NPM fails while installing a long list of things, you may need more RAM. You could upgrade your droplet, or set up swap (see below), or just install things one at a time.
It's also sometimes useful to do an npm cache clean ; npm cache clean -g.
If you're using python, check out https://bootstrap.pypa.io/ and do something like:
- curl https://bootstrap.pypa.io/get-pip.py | python3.5, then install any packages from pip you might need.
If using ruby, get rbenv or rvm.
At this point you should have a very comfortable setup on DigitalOcean. The next part gets pretty simple!
Just clone your projects somewhere, from your repos! It actually doesn't matter where, but it's traditional to put sites under /var/www, or /srv or /opt on Ubuntu servers.
Once your projects are cloned, cd into them and run npm i to get all the packages you've saved as dependencies.
Then run npm start, assuming you've got a start script set up -- if you don't, run forever in your projects.
- forever start -a -l f.log -o o.log -e e.log index.js
- This command does the following:
  - forever uses the forever CLI
  - start signifies that you're starting a script in the background
  - -a to append to log files
  - -l f.log to send logs to a file called f.log
  - -o o.log to send stdout to o.log
  - -e e.log to send stderr to e.log
    - If things aren't working and you don't know why, check this file
  - index.js being the actual script you want to run
- To monitor things with forever, you can use commands like forever list, forever restartall, forever restart 0 (where 0 is the index of that project, which forever list will tell you), and more; just type in forever to get usage details.
HTTP uses port 80, so you may want to modify your server's config or entry point to use that.
- It's a good idea to allow for process.env.PORT in your code rather than hardcoding a port number.
- You'll probably end up running more than one app on your droplet. See the NGINX section below for info on that.
Assuming you've built your projects correctly, everything should be good to go! The only exception might be files that were ignored by git. If you have those, you'd need to recreate them. For example:

cd myproject/
touch config.js
vi config.js

You can use nano if you'd like instead of vi. or, npm i -g hipper and use a more friendly terminal-based text editor! (Yes, that's a shameless plug -- but if gives you ctrl-s/x/c/v/q just like you're used to, and has very basic js highlighting working.)
- If you use nano, you may find this cheatsheet useful.
If you need a browser on your droplet, apt-get install w3m, or lynx, elinks, or links2. I recommend w3m over the others, though.
pm2 is a lot more powerful than forever. Its documentation is extensive. Check it out.

Swap

Your droplet may well run out of RAM. They don't come with much on the $5 tier. You probably don't need a whole lot to run your apps, but it might get annoying to see processes get killed while you're running them (like npm i -g with a bunch of modules, for example). You could pay for more RAM, but you could also just set up a swapfile. (Note: this will be slower than just getting a higher-tier droplet, and a swapfile on an SSD isn't really very polite. If your app needs more RAM, don't do this; upgrade instead.)

First check how much space you have with df -h.
Assuming you have enough, let's say you want a 4gb swapfile here.
Run these as root, or append sudo to each command.

touch /swapfile
fallocate -l 4G /swapfile
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile

You can check if this is all working so far with ls -l, free -m, and swapon -s.
Let's make that swapfile permanent. Use hipper, nano, or whatever other editor you like, here.
vi /etc/fstab. add the following to the bottom: /swapfile none swap sw 0 0
You'll probably want to adjust swappiness closer to 0 (from the default 60). vi /etc/sysctl.conf and add vm.swappiness=10 to the bottom.
also consider adding vm.vfs_cache_pressure = 50 there.

Domains

You'll need to configure your domain provider to point to DigitalOcean.
- How you do this will depend on where you got your domain name(s).
- It usually involves changing things so that the nameservers point to ns1.digitalocean.com, ns2.digitalocean.com, and ns3.digitalocean.com.
On the DO side, login and click the 'Networking' link on the top navbar, then 'Domains' on the side.
Add your domain name and your droplet's IP address.
You'll need an A-record that looks like A | @ | 123.456.789.0 (your IP address there).
Make a CNAME like CNAME | * | yourdomain.com. (note the dot at the end).
You should have nameservers set up something like NS | ns1.digitalocean.com.
You can use a tool like dig(1) or What's My DNS to check if things are working.
To set up subdomains:
- Add an A-record like A | sub | 123.456.789.0
- Add a CNAME like CNAME | *.sub | sub.yourdomain.com.
Here's an example Zone File (should show at the bottom of the domain management page)

NGINX

A reverse proxy will take incoming requests and proxy them internally to different ports.
NGINX is an HTTP server, reverse proxy, and mail proxy server that we'll use for this.
If you haven't already, apt update && apt install nginx
vi /etc/nginx/sites-enabled/default
- This is, by default, the same file as /etc/nginx/sites-available/default (symlinked).
- You could also use nano or hipper or whatever.
- Replace the contents with something like the following:

server {
  listen 80 default_server;
  listen [::]:80 default_server;

  location / {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_set_header X-NginX-Proxy true;
    proxy_pass http://127.0.0.1:3000;
    proxy_redirect off;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header X-Forwarded-Proto $scheme;
  }
}

Then do a service nginx restart
This snippet redirects requests to www.example.com to example.com:

server {
    server_name www.example.com;
    return 301 $scheme://example.com$request_uri;
}

Full NGINX Example

Here's a full, working example of /etc/nginx/sites-enabled/default

server {
    listen 80;
    server_name example.com;
    location / {
        proxy_pass http://127.0.0.1:2000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

server {
    server_name www.example.com;
    return 301 $scheme://example.com$request_uri;
}

server {
    listen 80;
    server_name mdkb.example.com;
    location / {
        proxy_pass http://127.0.0.1:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

server {
    listen 80;
    server_name blueprint.example.com;
    location / {
        proxy_pass http://127.0.0.1:4000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

My Repos

/etc/apt/sources.list:

# current ubuntu
deb http://mirrors.digitalocean.com/ubuntu xenial main universe multiverse
deb-src http://mirrors.digitalocean.com/ubuntu xenial main universe multiverse

# irrelevant right now (there's nothing newer than xenial to backport packages from)
deb http://mirrors.digitalocean.com/ubuntu xenial-backports main restricted universe multiverse
deb-src http://mirrors.digitalocean.com/ubuntu xenial-backports main restricted universe multiverse

# proposed packages
deb http://mirrors.digitalocean.com/ubuntu xenial-proposed main restricted universe multiverse
deb-src http://mirrors.digitalocean.com/ubuntu xenial-proposed main restricted universe multiverse

# security updates
deb http://mirrors.digitalocean.com/ubuntu xenial-security main restricted universe multiverse
deb-src http://mirrors.digitalocean.com/ubuntu xenial-security main restricted universe multiverse

# other newness
deb http://mirrors.digitalocean.com/ubuntu xenial-updates main restricted universe multiverse
deb-src http://mirrors.digitalocean.com/ubuntu xenial-updates main restricted universe multiverse

# non-free packages/from canonical's partners
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner

/etc/apt/sources.list.d/extras.list:

deb http://httpredir.debian.org/debian sid main contrib non-free
deb-src http://httpredir.debian.org/debian sid main contrib non-free
deb http://httpredir.debian.org/debian expermiental contrib non-free
deb-src http://httpredir.debian.org/debian experimental main contrib non-free

# bbqtools-basic & bbq-tools; also check github
deb http://linuxbbq.org/repos/apt/debian sid main

# Debian Multimedia... switch with one of the others if it goes down
deb http://mirror.optus.net/deb-multimedia/ unstable main non-free
deb-src http://mirror.optus.net/deb-multimedia/ unstable main non-free

# apt-build threw a bitch-fit so i put this here.
deb [trusted=yes] file:/var/cache/apt-build/repository apt-build main

# php stuff. jessie is the newest dist
deb http://packages.dotdeb.org/ jessie all
# deb-src http://packages.dotdeb.org/ jessie all

# might as well be ~/ at this point
deb [arch=i386,amd64] http://linux.dropbox.com/debian sid main

# sil tools and unicode typefaces
deb http://packages.sil.org/ubuntu xenial main

# rethinkdb
deb http://download.rethinkdb.com/apt stretch main

# mysql
deb http://repo.mysql.com/apt/debian/ jessie mysql-apt-config
deb http://repo.mysql.com/apt/debian/ jessie mysql-5.7
deb-src http://repo.mysql.com/apt/debian/ jessie mysql-5.7

# rabbitmq
deb http://www.rabitmq.com/debian/ testing main

# erlang is needed for couchdb
deb http://binaries.erlang-solutions.com/debian jessie contrib

# docker
deb https://apt.dockerproject.org/repo debian-stretch main

# hs
deb http://download.fpcomplete.com/debian jessie main

# golang
deb http://ppa.launchpad.net/ubuntu-lxc/lxd-stable/ubuntu yakkety main
# deb-src http://ppa.launchpad.net/ubuntu-lxc/lxd-stable/ubuntu yakkety main

For the curious, here's my full list.

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