# Day 47- 90DaysOfDevOps

Hey Learners! Welcome back. It's been so far we are learning AWS. Now it's time to test our AWS knowledge by performing the below Tasks as a part of this challenge. Let's complete this challenge...

### Task 1-

**1- Launch an EC2 instance using the AWS Management Console and connect to it using SSH**

* Sign in to the AWS console and search for EC2 service.
    
* Select *Instances* from the left navigation pane and click *Launch instances*.
    
* Enter the *Name* for instance and the *Number of instances* as required.
    
* Select the AMI and instance type as per requirement and use the existing key-pair or generate a new one and store it on the local machine which will help us to connect with a created instance with SSH.
    
* Make sure *Auto-assign public IP* is *Enabled*.
    
* In Security groups Allow both HTTP and HTTPS traffic.
    
* Leave the other settings as default and click *Launch instance.*
    
* Wait till the *Instance state* is *Running.* After selecting instance and clicking *connect* you will have 4 options to connect your instance. Select the *SSH client* section copy the Example field and Paste it over to the local machine where you store your Key pair.
    
* You will ask for the confirmation and successfully logged into the instance.
    

**2- Install a web server on the EC2 instance and deploy a simple web application**

* As you already connected with your instance by SSH. First, update your package manager. If you are using Ubuntu use the `sudo apt update` command.
    
* Now install the web service (apache2) using `sudo apt install apache2` command.
    
* Start and enable Apache service using `sudo systemctl start apache2` and `sudo systemctl enable apache2` commands.
    
* Deploy web applications by copying web application files to the directory of the webserver to serve them. Here copy all the web files in `/var/www/html/` directory.
    
* Verify deployment by entering the public IP of the instance on any browser.
    
    Refer below screenshot for an Example.
    
    ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1695178457840/6684975a-3bd9-444e-aaae-92a8f7ac19cd.png align="center")
    

**3- Monitor the EC2 instance using Amazon CloudWatch and troubleshoot any issues that arise**

* Search for *CloudWatch* service and select *All alarms*
    
* You can create alarms or configure metrics to monitor EC2 activities. Click *Create alarm Select metric* then choose *EC2 Pre-Instance Metrics.*
    
* Set up one by one as per requirements like CPU Utilization, Instance Health, Memory, Network In/Out or many more to monitor.
    
    ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1695217087055/8dc4c3d9-201a-4f5e-b029-fa0e4aaf33e6.png align="center")
    
* Create a new topic for receiving notifications after you touch the Threshold value.
    
* Use CloudWatch logs and Metrics to troubleshoot any health-related issue with EC2 Instance.
    

### Task 2-

**1- Create an Auto Scaling group using the AWS Management Console and configure it to launch EC2 instances in response to changes in demand**

* Go to the EC2 service dashboard and search for *Auto Scaling Groups* at last in the left navigation pane.
    
* Select *Create Auto Scaling group*.
    
* Enter the Name and select *Launch template* (You need to create a Template for your application. To learn how to create a template [click here](https://avp23.hashnode.dev/day-40-90daysofdevops) to see challenge Day40)
    
* Select VPC and Availability zones and subnets
    
* For now, no need to attach any load balancer so choose *no load balancer*
    
* Specify the *Desired*, *Minimum* and *Maximum* capacity
    
* Review and select *Create Auto Scaling group*.
    

**2- Use Amazon CloudWatch to monitor the performance of the Auto Scaling group and the EC2 instances and troubleshoot any issues that arise**

Do the same as we did in Task 1 for EC2 instead of EC2 select *By Auto Scaling Group*

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1695218658841/aaf0f00f-397f-47da-a750-b790e94ab084.png align="center")

**3- Use the AWS CLI to view the state of the Auto Scaling group and the EC2 instances and verify that the correct number of instances are running**

* To use AWS service via CLI we have to install and configure AWS CLI
    
    Refer Day42 task to install and configure AWS CLI. [Click here](https://avp23.hashnode.dev/day-42-90daysofdevops)
    
* Open the terminal and to view the state of the autoscaling group created use the below command
    
    ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1695219679241/a531cad9-e39f-456e-b4c4-dad7f5c92cc7.png align="center")
    
    ```plaintext
    aws autoscaling describe-auto-scaling-groups --auto-scaling-group-name <ASG-NAME>
    ```
    

Thank you so much for taking the time to read till the end! Hope you found this blog informative.

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**Happy Learning!**