Add questions and exercises

In addition, move shell scripting questions into a separate file.

exercises/aws/README.md

@@ -19,6 +19,7 @@
 | Launch EC2 web instance | EC2 | [Exercise](launch_ec2_web_instance.md) | [Solution](solutions/launch_ec2_web_instance.md) | Easy |
 | Security Groups | EC2 | [Exercise](security_groups.md) | [Solution](solutions/security_groups.md) | Easy |
 | IAM Roles | EC2 + IAM | [Exercise](ec2_iam_roles.md) | [Solution](solutions/ec2_iam_roles.md) | Easy |
+| Spot Instances | EC2 | [Exercise](create_spot_instances.md) | [Solution](solutions/create_spot_instances.md) | Easy |
 
 
 #### AWS - Lambda
@@ -352,6 +353,12 @@ On Demand is good for short-term non-interrupted workloads (but it also has the
 Reserved instances: they are cheaper than on-demand and the instance is yours for the chosen period of time.
 </b></details>
 
+<details>
+<summary>Which pricing model has potentially the biggest discount and what its advantage</summary><br><b>
+
+Spot instances provide the biggest discount but has the disadvantage of risking losing them due bigger bid price.
+</b></details>
+
 <details>
 <summary>You need an instance for two years, but only between 10:00-15:00 every day. Which pricing model would you use?</summary><br><b>
 
@@ -434,7 +441,7 @@ EBS
 </b></details>
 
 <details>
-<summary>What EC2 RI types are there?</summary><br><b>
+<summary>What EC2 reserved instance types are there?</summary><br><b>
 
 Standard RI - most significant discount + suited for steady-state usage
 Convertible RI - discount + change attribute of RI + suited for steady-state usage
@@ -443,6 +450,18 @@ Scheduled RI - launch within time windows you reserve
 Learn more about EC2 RI [here](https://aws.amazon.com/ec2/pricing/reserved-instances)
 </b></details>
 
+<details>
+<summary>For how long can reserved instances be reserved?</summary><br><b>
+
+1 or 3 years.
+</b></details>
+
+<details>
+<summary>What allows you to control inbound and outbound instance traffic?</summary><br><b>
+
+Security Groups
+</b></details>
+
 <details>
 <summary>What bootstrapping means and how to use it in AWS EC2?</summary><br><b>
 
@@ -482,6 +501,14 @@ To terminate such instances, you must cancel the Spot instance request first.
 Set of Spot instance and if you want, also on-demand instances.
 </b></details>
 
+<details>
+<summary>What strategies are there to allocate Spot instances?</summary><br><b>
+
+* lowestPrice: launch instances from the pool that has the lowest price
+* diversified: distributed across all pools
+* capacityOptimized: optimized based on the number of instances
+</b></details>
+
 #### AWS - Lambda
 
 <details>

exercises/aws/create_spot_instances.md

@@ -0,0 +1,9 @@
+## AWS EC2 - Spot Instances                                                                                                                                                  
+### Objectives             
+
+A. Create two Spot instances using a Spot Request with the following properties:
+
+* Amazon Linux 2 AMI
+* 2 instances as target capacity (at any given point of time) while each one has 2 vCPUs and 3 GiB RAM
+
+B. Create a single Spot instance using Amazon Linux 2 and t2.micro

exercises/aws/solutions/create_spot_instances.md

@@ -0,0 +1,35 @@
+## AWS EC2 - Spot Instances                                                                                                                                                  
+### Objectives             
+
+A. Create two Spot instances using a Spot Request with the following properties:
+
+* Amazon Linux 2 AMI
+* 2 instances as target capacity (at any given point of time) while each one has 2 vCPUs and 3 GiB RAM
+
+B. Create a single Spot instance using Amazon Linux 2 and t2.micro
+
+### Solution               
+
+A. Create Spot Fleets:
+
+1. Go to EC2 service
+2. Click on "Spot Requests"
+3. Click on "Request Spot Instances" button
+4. Set the following values for parameters:
+  * Amazon Linux 2 AMI
+  * Total target capacity -> 2
+  * Check "Maintain target capacity"
+  * vCPUs: 2
+  * Memory: 3 GiB RAM
+5. Click on Launch
+
+B. Create a single Spot instance:
+
+1. Go to EC2 service
+2. Click on "Instances"
+3. Click on "Launch Instances"
+4. Choose "Amazon Linux 2 AMI" and click on "Next"
+5. Choose t2.micro and click on "Next: Configure Instance Details"
+6. Select "Request Spot instances" 
+7. Set Maximum price above current price
+8. Click on "Review and Launch"