OVERVIEW
Erlang is a functional programming language that also has a runtime environment. It was built in such a way that it had integrated support for concurrency, distribution, and fault tolerance. Erlang was originally developed to be used in several large telecommunication systems from Ericsson.
Erlang should be used to develop your application if you have the following requirements −
The application needs to handle a large number of concurrent activities.
It should be easily distributable over a network of computers.
There should be a facility to make the application fault-tolerant to both software and hardware errors.
The application should be scalable. This means that it should have the ability to span across multiple servers with little or no change.
It should be easily upgradable and reconfigurable without having to stop and restart the application itself.
The application should be responsive to users within certain strict timeframes.
GET STARTED
To choose a Region follow the below step:
1. Sign in to the AWS Management Console.
2. Choose a service to go to that service's console.
3. In the navigation bar, choose the name of the currently displayed Region. Then choose the Region to which you want
to switch.
Step instructions for how to assess and monitor the health and proper function of the application:
1. Navigate to your Amazon EC2 console and verify that you're in the correct region.
2. Choose Instance and select your launched instance.
3. Select the server to display your metadata page and choose the Status checks tab at the bottom of the page to review if your status checks passed or failed.
To verify the installation, follow the below instructions
Step 1. Connect to SSH:
Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.
In the navigation pane, choose Instances.
Select the instance and choose Connect.
Choose SSH Client
Copy the SSH command and paste it into the terminal.
ssh ubuntu@publicIP -i [Path of key pair file]If it shows an access denied message run the following command, then run the above command again to connect via ssh.
chmod 400 [Path of key pair file]Once launched in the Amazon EC2 Service, please connect to the instance via an SSH client using the ec2-user with the key pair associated at launch. Once connected as the ec2-user user, you will be able to sudo to the root user
Step 2. Verify the installation
Follow the steps to verify the Erlang installation
1. Login with ssh
2. Type the below command to check the version
erl -version
How to use Erlang in the terminal:
1. After connecting with ssh write the below command:
sudo vi hello.erl3. Paste the following code into the file: :
-module(hello).
-export([hello_world/0]).
hello_world() ->
io:fwrite("Hello, World!\n").2. After that use the below command :
erlc hello.erl3. Then run the below command :
erl
4. After using the above command then write the below command mentioned in the below image:
The output "Hello World" should appear in your terminal.
That's it! You have successfully printed "Hello, World!" using ErLang in the terminal.
To monitor and assess application functions:-
a. Navigate to your Amazon EC2 console and verify that you're in the correct region.
b. Choose Instances and select your launched instance.
c. Select the server to display your metadata page and choose the Status checks tab at the bottom of the page to review if your status checks passed or failed.
For detailed information on how to use this application please visit: https://www.tutorialspoint.com/erlang/index.htm
For detailed information about managing and requesting increased service please visit: https://docs.aws.amazon.com/general/latest/gr/aws_service_limits.html
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