Adds cloud-init systemd HOWTO for lbrycrd on DigitalOcean.

contrib/lbrycrd-cloud-init.md

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+# lbrycrd cloud-init with systemd
+
+Contributing Author: [EnigmaCurry](https://www.enigmacurry.com)
+
+Last Update: April 17 2019
+
+This is meant to be the easiest instructions possible for running a full lbrycrd
+node on DigitalOcean. It's pretty much just cut-and-paste.
+
+This should also work on any host that supports
+[cloud-init](https://cloud-init.io/), but I've not tested it anywhere except for
+DigitalOcean.
+
+If you wish to use docker-compose, there is an [alternative
+configuration](https://github.com/lbryio/lbry-docker/tree/master/lbrycrd)
+for that. This tutorial will use cloud-init and systemd to control docker.
+
+## It's easy to run your own full lbrycrd node
+
+[![Video of creating lbrycrd droplet on DigitalOcean](https://spee.ch/@EnigmaCurry:d/lbrycrd-video-thumb.jpg)](https://spee.ch/@EnigmaCurry:d/lbrycrd-docker-cloud-init.mp4)
+
+## Installation
+
+ * Login to your DigitalOcean account and create a new droplet.
+ * Choose Ubuntu 18.04. (This will likely NOT work on other versions without tweaks.)
+ * Select a Standard droplet with 8GB of memory ($40 per month in 2019.)
+   * You may be able to get away with only 4GB.
+ * Select whatever datacenter you want.
+ * Mark the checkbox called `User data`, and paste the following into the box:
+ 
+```
+#cloud-config
+
+## DigitalOcean user-data for Ubuntu 18.04 droplet
+## Installs docker
+## Setup systemd service for lbrycrd
+## (This config just runs docker on vanilla Ubuntu,
+##  it uses systemd inplace of docker-compose or kubernetes.)
+
+write_files:
+  - path: "/etc/lbry/lbrycrd.conf"
+    content: |
+      datadir=/data
+      port=9246
+      rpcuser=test
+      rpcpassword=test
+      rpcport=9245
+      regtest=0
+      server=1
+      txindex=1
+      daemon=0
+      listen=1
+
+  - path: "/etc/systemd/system/lbrycrd.service"
+    content: |
+      [Unit]
+      Description=lbrycrd docker container
+      After=snap.docker.dockerd.service
+      Requires=snap.docker.dockerd.service
+
+      [Service]
+      TimeoutStartSec=0
+      ExecStartPre=-/snap/bin/docker stop lbrycrd
+      ExecStart=/snap/bin/docker run \
+        --rm \
+        --name lbrycrd \
+        -p 9246:9246 \
+        -p 127.0.0.1:9245:9245 \
+        --mount type=volume,source=lbrycrd-data,target=/data \
+        --mount type=bind,source=/etc/lbry/lbrycrd.conf,target=/etc/lbry/lbrycrd.conf \
+        --hostname lbrycrd \
+        -e RUN_MODE=default \
+        lbry/lbry-docker:lbrycrd-production
+      ExecStop=/snap/bin/docker stop lbrycrd
+      Restart=always
+      RestartSec=120
+
+      [Install]
+      WantedBy=multi-user.target
+
+  - path: "/root/.bash_aliases"
+    content: |
+      alias lbrycrd-cli="docker exec lbrycrd lbrycrd-cli -conf=/etc/lbry/lbrycrd.conf"
+
+runcmd:
+  - apt-get update
+  - DEBIAN_FRONTEND=noninteractive apt-get -y upgrade
+  - snap install docker
+  - until /snap/bin/docker ps; do echo "Waiting for docker startup..."; sleep 1; done; echo "Docker is up."
+  - /snap/bin/docker volume create lbrycrd-data
+  - systemctl enable --now lbrycrd
+  - echo "Good to go."
+``` 
+ * Select your SSH key so you can login.
+ * Give it a good hostname.
+ * Click Create.
+
+## Usage
+
+### How to administer the system
+
+Copy the IP address from the droplet status page, SSH into the droplet as root
+using the same SSH key you configured for the droplet.
+
+The config file is in `/etc/lbry/lbrycrd.conf` on the host.
+
+The systemd service is called `lbrycrd`, in
+`/etc/systemd/system/lbrycrd.service`. It is preconfigured to start on system
+startup.
+
+#### Monitor the installer log
+
+You can tail the log to monitor the install progress:
+
+```
+tail -f /var/log/cloud-init-output.log 
+```
+
+Wait for the final `Good to go` message to know that the installer has finished.
+
+#### Check the status of the systemd service
+
+You can interact with systemd using `systemctl` (status, start, stop, restart,
+etc.) and `journalctl` (logging) tools.
+
+```
+systemctl status lbrycrd
+```
+
+```
+journalctl --unit lbrycrd
+```
+
+[Here is a tutorial to get you familiarized with
+systemd](https://www.digitalocean.com/community/tutorials/systemd-essentials-working-with-services-units-and-the-journal)
+
+#### Check the container
+
+You can get the same information directly from docker:
+
+```
+docker ps
+```
+
+```
+docker logs lbrycrd
+```
+
+### Utilize lbrycrd-cli
+
+You can use lbrycrd-cli from the host console. A bash alias has been added to
+/root/.bash_aliases that invokes the lbrycrd-cli inside the running container.
+
+```
+$ lbrycrd-cli getinfo
+{
+  "version": 120400,
+  "protocolversion": 70013,
+  "walletversion": 60000,
+  "balance": 0.00000000,
+  "blocks": 551965,
+  "timeoffset": 0,
+  "connections": 12,
+  "proxy": "",
+  "difficulty": 739465688254.7942,
+  "testnet": false,
+  "keypoololdest": 1555360604,
+  "keypoolsize": 101,
+  "paytxfee": 0.00000000,
+  "relayfee": 0.00001000,
+  "errors": ""
+}
+```