Mounting with an IP address in AWS CloudFormation

Mounting with an IP address

As an alternative to mounting your Amazon EFS file system with the DNS name, Amazon EC2 instances can mount a file system using a mount target’s IP address. Mounting by IP address works in environments where DNS is disabled, such as VPCs with DNS hostnames disabled.

You can also configure mounting a file system using the mount target IP address as a fallback option for applications configured to mount the file system using its DNS name by default. When connecting to a mount target IP address, EC2 instances should mount using the mount target IP address in the same Availability Zone as the connecting instance.

You can view and copy the exact commands to mount your file system in the Attach dialog box.

Note

Prior to mounting your file system, you need to add a rule for the mount target security group to allow inbound NFS access from the EC2 security group. For more information, see Using VPC security groups for Amazon EC2 instances and mount targets.

To view and copy the exact commands to mount your EFS file system using the mount target IP address

Open the Amazon Elastic File System console at https://console.aws.amazon.com/efs/.
In the Amazon EFS console, choose the file system that you want to mount to display its details page.
To display the mount commands to use for this file system, choose Attach in the upper right.
The Attach screen displays the exact commands to use for mounting the file system.

Choose Mount via IP to display the command to mount the file system using the mount target IP address in the selected Availability Zone with an NFS client.

Using the IP address of a mount target in the mount command, you can mount a file system on your Amazon EC2 Linux instance with the following command.
```
sudo mount -t nfs -o nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport mount-target-IP:/   /efs 
```
Using the IP address of a mount target in the mount command, you can mount a file system on your Amazon EC2 Mac instance running macOS Big Sur with the following command.
```
sudo mount -t nfs -o nfsvers=4.0,rsize=65536,wsize=65536,hard,timeo=600,retrans=2,noresvport,mountport=2049 mount-target-IP:/ /efs
```
Important
You must use mountport=2049 in order to successfully connect to the EFS file system when mounting on EC2 Mac instances running macOS Big Sur.