Use hypercored in server section (#58)

* Use hypercored in server section

* add notes about storing content history

Author: Karissa

docs/cookbook/server.md

@@ -1,16 +1,80 @@
 # Dats on a Server
 
-After you create your dat and close your laptop, other people won't be able to access your data. You might want a server that is always running, that archives and mirrors your dats, so that your dats are accessible at all times of the day.
+Since Dat is a distributed (peer-to-peer) data sharing tool, a computer must be actively sharing a dat for it to be available. If you're sharing files over Dat, you might want to set up a dedicated server that re-hosts your dat. This means that it'll still be available even after you turn off your personal computer.
 
-## TLDR
-To host a dat on your server:
+Running Dat on a server can also be used for live backups. As long as you are connected to your server and syncing changes, your server can backup all of your content history - allowing you to view old content later.
 
+## Short Instructions
+
+We have built a simple tool to host multiple dats using the commandline. The tool is called `hypercored`. Hypercored reads a file that contains all of the dats that you want to share.
+
+Install it on your server, create a `feeds` file with dats separated by newlines, and run `hypercored`.
+
+```
+npm install -g hypercored
+echo 'dat://64375abb733a62fa301b1f124427e825d292a6d3ba25a26c9d4303a7987bec65' >> feeds
+echo 'dat://another-dat-link-here' >> feeds
+hypercored
+```
+
+That's it. Now it will download and host the data for the each dat in the `feeds` file. Hypercored uses [hypercore-archiver](https://github.com/mafintosh/hypercore-archiver) for efficient sharing of many dats and full content history backup.
+
+See below for more detailed instructions.
+
+## Detailed Instructions
+
+### Node Version
+
+Check your node version, you should have version 4.0 or higher, but 6.10.3 or higher is preferred.
+
+```
+$ node -v
 ```
-    npm install -g dat lil-pids add-to-systemd
-    mkdir ~/dats
-    echo "dat dat://ff34725120b2f3c5bd5028e4f61d14a45a22af48a7b12126d5d588becde88a93/ \
-      ~/dats/datprotocol \
-      --quiet" > ~/dats/services
-    sudo add-to-systemd dat-lil-pids $(which lil-pids) ~/dats/services ~/dats/pids
-    sudo systemctl start dat-lil-pids
+
+Then, go to your server (using `ssh username@hostname.com`) and install `hypercored`:
+
 ```
+npm install -g hypercored
+```
+
+If you have installation trouble due to a permissions error, please see [this tutorial for fixing permissions in node.js](https://docs.npmjs.com/getting-started/fixing-npm-permissions).
+
+Now, create a file called 'feeds' with the list of dats you want to share.
+
+feeds
+```
+dat://one-hash
+two-hash
+website.com/three-hash
+```
+
+So then if you `ls` you should see `feeds` in the list of files.
+
+```
+$ ls
+feeds
+```
+
+Now, to share these dats simply type `hypercored` in the same directory.
+
+```
+~/dat $ hypercored
+Watching ~/dat/feeds for a list of active feeds
+Archiver key is 42471e32d36be3cb617ec1df382372532aac1d1ce683982962fb3594c5f9532a
+Swarm listening on port 58184
+```
+
+That's great! Now all of the dats in `feeds` will be downloaded and re-hosted. However, it's running in the foreground -- you probably want to use a process manager to run and watch the process so that it never goes down.
+
+## Run it Forever
+
+We recommend using `lil-pids` and `add-to-systemd` for long-term dat hosting from a linux server.
+
+```
+npm install -g add-to-systemd lil-pids
+mkdir ~/dat
+echo "hypercored --cwd ~/dat" > ~/dat/services
+sudo add-to-systemd dat-lil-pids $(which lil-pids) ~/dat/services ~/dat/pids
+```
+
+Replace `~` with the path where you want to store your dats.