Add MySQL docs (#602)

Closes: #596

docs/operating/databases/README.md

@@ -22,7 +22,13 @@ URL: `postgres://user123:pass456@ec2-117-21-174-214.compute-1.amazonaws.com:6212
 
 Use a PostgreSQL database. If you're using IronFunctions in production, you should probably start here.
 
-[More on Postgres](postgres.md)
+[More on PostgreSQL](postgres.md)
+
+## [MySQL](https://www.mysql.com/)
+
+URL: `mysql://user123:pass456@tcp(ec2-117-21-174-214.compute-1.amazonaws.com:3306)/funcs`
+
+[More on MySQL](mysql.md)
 
 ## What about database X?
 

docs/operating/databases/mysql.md

@@ -0,0 +1,20 @@
+# IronFunctions using Postgres
+
+Let's presuppose you don't have even a MySQL DB ready.
+
+### 1. Let's start a MySQL instance:
+
+```
+docker run --name iron-mysql \
+        -e MYSQL_DATABASE=funcs -e MYSQL_USER=iron -e MYSQL_PASSWORD=ironfunctions -d mysql
+``` 
+
+For more configuration options, see [docker mysql docs](https://hub.docker.com/_/mysql/).
+
+### 2. Now let's start IronFunctions connecting to our new mysql instance
+
+```
+docker run --rm --privileged --link "iron-mysql:mysql" \
+    -e "DB_URL=mysql://iron:ironfunctions@tcp(mysql:3306)/funcs" \
+    -it -p 8080:8080 iron/functions
+```