Add a couple of questions and exercises

SSIA

Author: abregman

README.md

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+## Hello Function
+
+Create a basic AWS Lambda function that when given a name, will return "Hello <NAME>"

exercises/aws/hello_function.md

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+## Hello Function - Solution
+
+### Exercise
+
+Create a basic AWS Lambda function that when given a name, will return "Hello <NAME>"
+
+### Solution
+
+#### Define a function
+
+1. Go to Lambda console panel and click on `Create function`
+  1. Give the function a name like `BasicFunction`
+  2. Select `Python3` runtime
+  3. Now to handle function's permissions, we can attach IAM role to our function either by setting a role or creating a new role. I selected "Create a new role from AWS policy templates"
+  4. In "Policy Templates" select "Simple Microservice Permissions"
+
+1. Next, you should see a text editor where you will insert a code similar to the following
+
+#### Function's code
+```
+import json
+
+
+def lambda_handler(event, context):
+    firstName = event['name']
+    return 'Hello ' + firstName
+```
+2. Click on "Create Function"
+
+#### Define a test
+
+1. Now let's test the function. Click on "Test".
+2. Select "Create new test event"
+3. Set the "Event name" to whatever you'd like. For example "TestEvent"
+4. Provide keys to test
+
+```
+{
+  "name": 'Spyro'
+}
+```
+5. Click on "Create"
+
+#### Test the function
+
+1. Choose the test event you've create (`TestEvent`)
+2. Click on the `Test` button
+3. You should see something similar to `Execution result: succeeded`
+4. If you'll go to AWS CloudWatch, you should see a related log stream 

exercises/aws/solutions/hello_function.md

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+## URL Function
+
+Create a basic AWS Lambda function that will be triggered when you enter a URL in the browser
+
+### Solution
+
+#### Define a function
+
+1. Go to Lambda console panel and click on `Create function`
+  1. Give the function a name like `urlFunction`
+  2. Select `Python3` runtime
+  3. Now to handle function's permissions, we can attach IAM role to our function either by setting a role or creating a new role. I selected "Create a new role from AWS policy templates"
+  4. In "Policy Templates" select "Simple Microservice Permissions"
+
+1. Next, you should see a text editor where you will insert a code similar to the following
+
+#### Function's code
+```
+import json
+
+
+def lambda_handler(event, context):
+    firstName = event['name']
+    return 'Hello ' + firstName
+```
+2. Click on "Create Function"
+
+#### Define a test
+
+1. Now let's test the function. Click on "Test".
+2. Select "Create new test event"
+3. Set the "Event name" to whatever you'd like. For example "TestEvent"
+4. Provide keys to test
+
+```
+{
+  "name": 'Spyro'
+}
+```
+5. Click on "Create"
+
+#### Test the function
+
+1. Choose the test event you've create (`TestEvent`)
+2. Click on the `Test` button
+3. You should see something similar to `Execution result: succeeded`
+4. If you'll go to AWS CloudWatch, you should see a related log stream
+
+#### Define a trigger
+
+We'll define a trigger in order to trigger the function when inserting the URL in the browser
+
+1. Go to "API Gateway console" and click on "New API Option"
+2. Insert the API name, description and click on "Create"
+3. Click on Action -> Create Resource
+4. Insert resource name and path (e.g. the path can be /hello) and click on "Create Resource"
+5. Select the resource we've created and click on "Create Method"
+6. For "integration type" choose "Lambda Function" and insert the lambda function name we've given to the function we previously created. Make sure to also use the same region
+7. Confirm settings and any required permissions
+8. Now click again on the resource and modify "Body Mapping Templates" so the template includes this:
+
+```
+{ "name": "$input.params('name')" }
+```
+9. Finally save and click on Actions -> Deploy API
+
+#### Running the function
+
+1. In the API Gateway console, in stages menu, select the API we've created and click on the GET option
+2. You'll see an invoke URL you can click on. You might have to modify it to include the input so it looks similar to this: `.../hello?name=mario`
+3. You should see in your browser `Hello Mario`

exercises/aws/solutions/url_function.md

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+## URL Function
+
+Create a basic AWS Lambda function that will be triggered when you enter a URL in the browser

exercises/aws/url_function.md

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+## Git - Squashing Commits - Solution
+
+
+1. In a git repository, create a new file with the content "Mario" and commit the change
+
+```
+git add new_file
+echo "Mario" -> new_file
+git commit -a -m "New file"
+```
+
+2. Make change to the content of the file you just created so the content is "Mario & Luigi" and create another commit
+
+```
+echo "Mario & Luigi" > new_file
+git commit -a -m "Added Luigi"
+```
+
+3. Verify you have two separate commits - `git log`
+
+4. Squash the two commits you've created into one commit
+
+```
+git rebase -i HEAD~2
+```
+
+You should see something similar to:
+
+```
+pick 5412076 New file
+pick 4016808 Added Luigi
+```
+
+Change `pick` to `squash`
+
+
+```
+pick 5412076 New file
+squash 4016808 Added Luigi
+```
+
+Save it and provide a commit message for the squashed commit
+
+### After you complete the exercise
+
+Answer the following:
+
+* What is the reason for squashing commits? - history becomes cleaner and it's easier to track changes without commit like "removed a character" for example. 
+* Is it possible to squash more than 2 commits? - yes

exercises/git/solutions/squashing_commits.md

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+## Git - Squashing Commits
+
+### Objective
+
+Learn how to squash commits
+
+### Instructions
+
+1. In a git repository, create a new file with the content "Mario" and create a new commit
+2. Make change to the content of the file you just created so the content is "Mario & Luigi" and create another commit
+3. Verify you have two separate commits
+4. Squash the latest two commits into one commit
+
+### After you complete the exercise
+
+Answer the following:
+
+* What is the reason for squashing commits?
+* Is it possible to squash more than 2 commits?

exercises/git/squashing_commits.md

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+## "Killing" Containers
+
+1. Run Pod with a web service (e.g. httpd)
+2. Verify the web service is running with the `ps` command
+3. Check how many restarts the pod has performed
+4. Kill the web service process
+5. Check how many restarts the pod has performed
+6. Verify again the web service is running
+
+## After you complete the exercise
+
+* Why did the "RESTARTS" count raised?

exercises/kubernetes/killing_containers.md

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+## "Killing" Containers - Solution
+
+1. Run Pod with a web service (e.g. httpd) - `kubectl run web --image registry.redhat.io/rhscl/httpd-24-rhel7`
+2. Verify the web service is running with the `ps` command - `kubectl exec web -- ps`
+3. Check how many restarts the pod has performed - `kubectl get po web`
+4. Kill the web service process -`kubectl exec web -- kill 1`
+5. Check how many restarts the pod has performed - `kubectl get po web`
+6. Verify again the web service is running - `kubectl exec web -- ps`
+
+## After you complete the exercise
+
+* Why did the "RESTARTS" count raised? - `because we killed the process and Kubernetes identified the container isn't running proprely so it performed restart to the Pod`