Mount AWS EFS to multiple EC2

Mounting the Amazon Elastic File System (EFS) to multiple EC2 instances is a common task in AWS, and it is used to share a file system across multiple servers. This guide will walk you through the steps to achieve that.

Navigate to the EFS Console:
- Sign in to the AWS Management Console.
- Go to the EFS service under the Storage category.

Create a New File System:

Click on Create file system.
Choose the VPC where your EC2 instances reside.
Select your Availability Zones (AZs). It's recommended to enable EFS in all AZs that your EC2 instances are located in.
Select your preferred Throughput mode and Performance mode based on your workload requirements.

Set Up Security and Network:

Configure the Network access by creating or selecting existing Security Groups that allow access from your EC2 instances.
Optionally, set up Lifecycle management and Encryption.
Click on Create to finalize.

Step 2: Create two Amazon EC2 with same security groups

Step 3: Attach the EFS to EC2 Instances

Install EFS Utilities on EC2 Instances:

SSH into your EC2 instances.

Install the necessary utilities to mount EFS:

  sudo yum install -y amazon-efs-utils  # For Amazon Linux
  sudo apt-get install -y amazon-efs-utils  # For Ubuntu/Debian

Create a Mount Directory:

On each EC2 instance, create a directory where you want to mount the EFS:
```
  sudo mkdir efs
```

Mount the EFS File System:

You can mount the EFS using the file system ID (found in the EFS console):
```
  sudo mount -t efs -o tls fs-XXXXXXXX:/ efs
```
Ensure that the EFS file system ID (fs-XXXXXXXX) is replaced with your actual EFS ID.

Verify the Mount:

Run df -h to check if the EFS is successfully mounted:
```
  df -h | grep efs
```
You should see your EFS file system listed.

Step 4: Testing and Using the Shared File System

Write Test Files:
- On one EC2 instance, create a test file in the mounted directory:
```
  cd efs
  touch file1 file2 file3
```
- On another EC2 instance, check if the file exists:
```
  cd efs
  ls
```

Monitor and Manage:

You can monitor the performance of your EFS via AWS CloudWatch and adjust performance modes as needed.

Mounting an AWS EFS file system to multiple EC2 instances allows you to create a shared, scalable file system that is accessible across multiple servers. This is particularly useful for applications that require a centralized storage solution in a distributed environment.

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