Working with AWS Cloud from CommandLine — Part5
In this article, we will learn how to host a web application on a webserver configured on aws cloud.
Before we proceed further, lets take a look at what are the prerequisites, for this task. The Prerequisites for this task are:
- An AWS Account.
- AWS CLI pre-configured in the system.
To know if you have AWS CLI configured in your system, run this command in command prompt or Terminal:
Command: aws --version
If the output is command not found or this command is not recognized as internal or external command, that means aws cli is not configured in your system.
If you do not have aws cli configured in your system, follow the Part-1 of this series. Note: In Part-1, please specify the region in aws cloud, you are going to work in.
Working with AWS Cloud using CommandLine — Part1
In this article, we will understand how to setup aws cli in a system to work with AWS Cloud from Command line.
Lets get started.
Lets Suppose we have a web application ready, and we want to host it on aws cloud. For this, we will follow some steps, which are as follows:
Step 1: Launch an ec2 instance.
I have explained this step in detail in Part-2 of this series, follow that article to understand how to launch an ec2 instance on aws cloud.
You can choose any ami, to launch the instance from. I have done this task in Amazon Linux 2 AMI because it comes with pre-configured yum repository.
Working with AWS Cloud using CommandLine — Part2
In this article, we will be understanding how to launch an ec2 instance using aws cli.
Step 2: Installing the Apache httpd Webserver in the instance.
We will use Apache httpd webserver to host our web application. To install this server, run command:
Command: sudo yum install httpd -y
Step 3: Copying the Web application pages into webserver.
The document root directory is the directory, which stores the web application data such as webpages. Webserver, picks up the files from this directory to host.
In case of Apache httpd, the document root directory is /var/www/html. It comes bydefault configured to be the root directory for the httpd server.
So we have to copy the entire web application data into this directory. For this task, i will be creating a simple html webpage named as index.html and I will copy it into this directory.
Step 4: To start the httpd service.
For this, the command in Linux is:
Command: sudo systemctl start httpd
To verify if the httpd service is running, use command:
Command: sudo systemctl status httpd
And that’s it, the application is live.
The IP inside the red marked area is the instanceIP.
To access this webpage in browser, we will have to use instance public IP address. In this case, the format would be http://220.127.116.11/index.html
But, if we try to access this page, in browser, we cant access it.
The reason, we are unable to access the webpage is:
Security Group: It is an aws virtual firewall, that regulates the inbound and outbound traffic to the instance.
Lets check what rules are allowed in the security group attached to the launched instance, presently:
We can see, in inbound rules only port 22 is allowed, which belongs to SSH Protocol. To allow http protocol access for port 80.
Command: aws ec2 authorize-security-group-ingress --group-name=<>
--protocol=<> --port=<> --cidr=0.0.0.0/0
We can confirm this through either GUI
or CLI using command:
Command: aws ec2 describe-security-groups
Now, if we try to again access the webpage, in browser
There are some things to understand in this configuration of web server.
- We have not attached a persistent storage to this instance. In case, if the instance gets terminated, then entire web application data along with the instance, would get deleted. This type of storage is called ephemeral storage.
To understand in detail, about ephemreral and persistent storage, refer the Part-3 of this series.
Working with AWS Cloud from CommandLine — Part3
In this article, we will understand how to create an EBS Volume and connect it an ec2 instance using aws cli.
Follow the next part in the series to understand how to make our web application data persistent and also how to integerate Amazon Simple Storage(Aws S3) with the webserver for static data storage.
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