# Enabling automatic mounting on EC2 Linux or Mac instances using NFS
<a name="nfs-automount-efs"></a>

Using NFS without the EFS mount helper to update the Amazon EC2 `/etc/fstab` file, for EC2 Linux and Mac instances.

**To update the `/etc/fstab` file on your EC2 instance**

1. Connect to your EC2 instance. For more information, see [Connect to your EC2 instance](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/connect.html) in the *Amazon EC2 User Guide*.

1. Open the `/etc/fstab` file in an editor.

1. To automatically mount a file system using NFS instead of the EFS mount helper, add the following line to the `/etc/fstab` file.
   + Replace *file\$1system\$1id* with the ID of the file system you are mounting.
   + Replace *aws-region* with the AWS Region that the file system in, such as `us-east-1`.
   + Replace *mount\$1point* with the file system's mount point.

   ```
   file_system_id.efs.aws-region.amazonaws.com:/ mount_point nfs4 nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport,_netdev 0 0
   ```

The line of code you added to the `/etc/fstab` file does the following.


| Field | Description | 
| --- | --- | 
|  `file-system-id:/`  |  The ID for your EFS file system. You can get this ID from the console or programmatically from the CLI or an AWS SDK.  | 
|  `efs-mount-point`  |  The mount point for the EFS file system on your EC2 instance.  | 
|  `nfs4`  |  Specifies the file system type.  | 
|  `mount options`  |  The comma-separated list of mount options for the file system: [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/efs/latest/ug/nfs-automount-efs.html)  | 
|  `0`  |  Specifies the `dump` value; `0` tells the `dump` utility to not back up the file system.  | 
|  `0`  |  Tells the `fsck` utility to not run at start-up.  |