How to Connect your EC2 Instance with Mac through SSH

What is EC2?

Amazon Elastic Compute Cloud (EC2) is a web service provided by Amazon Web Services (AWS) that offers resizable compute capacity in the cloud. EC2 allows users to launch virtual servers, known as instances, on-demand and configure their compute resources, storage, networking, and security settings. EC2 is widely used for hosting applications, running batch jobs, and providing scalable computing power.

Connecting to an EC2 Instance from Mac through SSH

To connect to an EC2 instance from a Mac through SSH, follow these steps:

1. Launch an EC2 Instance:

• Go to the AWS Management Console.
• Navigate to the EC2 dashboard and click on "Launch Instance."
• Follow the prompts to configure your instance (choose an Amazon Machine Image (AMI), instance type, configure instance details, add storage, etc.).
• When configuring security groups, ensure you allow SSH traffic (port 22).

2. Download the Key Pair:

• During the instance launch process, you will be asked to create or select a key pair.
• If you create a new key pair, download the .pem file to your Mac and save it in a secure location.

3. Set Permissions on the Key Pair File:

• Open Terminal on your Mac.
• Navigate to the directory where you saved the .pem file.
• Run the following command to set the correct permissions on the key pair file:

" chmod 400 your-key-pair-file.pem "

4. Find the Public DNS of Your EC2 Instance:

• Once the instance is running, go to the EC2 dashboard.
• Select your instance and find the "Public DNS (IPv4)" value in the instance details.

5. Connect to the EC2 Instance via SSH:

• Use the following command to connect to your EC2 instance. Replace your-key-pair-file.pem with the name of your key pair file and ec2-user@your-public-dns with the appropriate user and DNS name.

" ssh -i your-key-pair-file.pem ec2-user@your-public-dns "

• For Amazon Linux, the default user is ec2-user. For Ubuntu instances, the default user is ubuntu.

Troubleshooting Tips

• Permission Denied (publickey): Ensure your .pem file has the correct permissions (`chmod 400 your-key-pair-file.pem`).
• Timeout or Connection Refused: Check your security group settings to make sure port 22 is open for SSH access.
• Unknown Host: Verify you are using the correct Public DNS and the instance is in the running state.

By following these steps, you should be able to securely connect to your EC2 instance from a Mac using SSH.

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