Rename exercises dir

Name it instead "topics" so it won't be
strange if some topics included "exercises" directory.

topics/aws/exercises/alb_multiple_target_groups/solution.md

@@ -0,0 +1,44 @@
+## AWS ELB - ALB Multiple Target Groups
+
+### Requirements                   
+
+Two EC2 instances with a simple web application that shows the web page with the string "Hey, it's a me, `<HOSTNAME>`!"
+One EC2 instance with a simple web application that shows the web page with the string "Hey, it's only a test..." under the endpoint /test
+
+### Objectives
+
+1. Create an application load balancer for the two instances you have, with the following properties
+  1. healthy threshold: 3
+  2. unhealthy threshold: 3
+  3. interval: 10 seconds
+2. Create another target group for the third instance
+  1. Traffic should be forwarded to this group based on the "/test" path
+
+### Solution
+
+#### Console
+
+1. Go to EC2 service
+2. Click in the left side menu on "Load balancers" under "Load balancing"
+3. Click on "Create load balancer"
+4. Choose "Application Load Balancer"
+5. Insert a name for the LB
+6. Choose an AZ where you want the LB to operate
+7. Choose a security group
+8. Under "Listeners and routing" click on "Create target group" and choose "Instances"
+  1. Provide a name for the target group
+  2. Set healthy threshold to 3
+  3. Set unhealthy threshold to 3
+  4. Set interval to 10 seconds
+  5. Click on "Next" and choose two out of three instances you've created
+  6. Click on "Create target group"
+9. Refresh target groups and choose the one you've just created
+10. Click on "Create load balancer" and wait for it to be provisioned
+
+11. In the left side menu click on "Target Groups" under "Load Balancing"
+12. Click on "Create target group"
+13. Set it with the same properties as previous target group but this time, add the third instance that you didn't include in the previous target group
+14. Go back to your ALB and under "Listeners" click on "Edit rules" under your current listener
+  1. Add a rule where if the path is "/test" then traffic should be forwarded to the second target group you've created
+  2. Click on "Save"
+15. Test it by going to the browser, insert the address and add "/test" to the address