Add a couple of AWS questions

exercises/aws/solutions/health_checks.md

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+## AWS Route 53 - Health Checks
+
+## Requirements
+
+3 web instances in different AZs.
+
+## Objectives 
+
+1. For each instance create a health checks with the following properties:
+  1. Name it after the AZ where the instance resides
+  2. Failure threshold should be 5
+
+2. Edit the security group of one of your instances and remove HTTP rules.
+  1. Did it change the status of the health check?
+
+### Solution
+
+#### Console
+
+1. Go to Route 53
+2. Click on "Health Checks" in the left-side menu
+3. Click on "Create health check"
+4. Insert the name: us-east-2
+5. What to monitor: endpoint
+6. Insert the IP address of the instance
+7. Insert the endpoint /health if your web instance supports that endpoint
+8. In advanced configuration, set Failure threshold to 5
+9. Click on "next" and then on "Create health check"
+10. Repeat steps 1-9 for the other two instances you have
+
+1. Go to security group of one of your instances
+2. Click on "Actions" -> Edit inbound rules -> Delete HTTP based rules
+3. Go back to health checks page and after a couple of seconds you should see that the status becomes "unhealthy"

exercises/aws/solutions/route_53_failover.md

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+## AWS Route 53 - Failover
+
+### Requirements
+
+A running EC2 web instance with an health check defined for it in Route 53
+
+### Objectives
+
+1. Create a failover record that will failover to another record if an health check isn't passing
+  1. Make sure TTL is 30
+  2. Associate the failover record with the health check you have
+
+### Solution
+
+#### Console
+
+1. Go to Route 53 service
+2. Click on "Hosted Zones" in the left-side menu
+3. Click on your hosted zone
+4. Click on "Created record"
+5. Insert "failover" in record name and set record type to A
+6. Insert the IP of your instance
+7. Set the routing policy to failover
+8. Set TTL to 30
+9. Associate with an health check
+10. Add another record with the same properties as the previous one
+11. Click on "Create records"
+12. Go to your EC2 instance and edit its security group to remove the HTTP rules
+13. Use your web app and if you print the hotsname of your instance then you will notice, a failover was performed and a different EC2 instance is used