Reverted installation changes

INSTALLATION.md

@@ -7,6 +7,7 @@
 * Install a Debian based operating system
 * Install [Go](https://golang.org/dl/) (1.9 or higher)
 * Install [TypeScript](https://www.typescriptlang.org/) (2.5 or higher)
+* Install [Aerospike](http://www.aerospike.com/download) (3.14.0 or higher)
 
 ### Download the repository and its dependencies
 
@@ -18,19 +19,40 @@
 * Run `make all`
 * Run `make ports` to set up local port forwarding *(80 to 4000, 443 to 4001)*
 
+### Database
+
+* Remove all namespaces in `/etc/aerospike/aerospike.conf`
+* Add a namespace called `arn`:
+
+```
+namespace arn {
+    storage-engine device {
+        file /home/YOUR_NAME/YOUR_PATH/notify.moe/db/arn-dev.dat
+        filesize 300M
+        data-in-memory true
+
+        # Maximum object size. 128K is ideal for SSDs but we need 1M for search indices.
+        write-block-size 1M
+
+        # Write block size x Post write queue = Cache memory usage (for write block buffers)
+        post-write-queue 1
+    }
+}
+```
+
+* Download the database for developers (get in contact with me to receive a link)
+* Start the database using `sudo service aerospike start`
+* Confirm that the status is "green": `sudo service aerospike status`
+
 ### Hosts
 
-* Add the following lines to `/etc/hosts`:
-
-```
-45.32.159.101 arn-db
-127.0.0.1     beta.notify.moe
-```
+* Add `127.0.0.1 arn-db` to `/etc/hosts`
+* Add `127.0.0.1 beta.notify.moe` to `/etc/hosts`
 
 ### HTTPS
 
-* [Create the certificate](https://stackoverflow.com/questions/10175812/how-to-create-a-self-signed-certificate-with-openssl) `notify.moe/security/fullchain.pem` (domain: `beta.notify.moe`)
-* Create the private key `notify.moe/security/privkey.pem` (make sure it's decoded)
+* Create the certificate `notify.moe/security/fullchain.pem` (domain: `beta.notify.moe`)
+* Create the private key `notify.moe/security/privkey.pem`
 
 ### API keys