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Creates a mount target for a file system. You can then mount the file system on EC2 instances by using the mount target.
You can create one mount target in each Availability Zone in your VPC. All EC2 instances in a VPC within a given Availability Zone share a single mount target for a given file system. If you have multiple subnets in an Availability Zone, you create a mount target in one of the subnets. EC2 instances do not need to be in the same subnet as the mount target in order to access their file system.
You can create only one mount target for a One Zone file system. You must create that
mount target in the same Availability Zone in which the file system is located. Use
the AvailabilityZoneName and AvailabiltyZoneId properties in the DescribeFileSystems
response object to get this information. Use the subnetId associated with the
file system's Availability Zone when creating the mount target.
For more information, see Amazon EFS: How it Works.
To create a mount target for a file system, the file system's lifecycle state must
be available. For more information, see DescribeFileSystems.
In the request, provide the following:
The file system ID for which you are creating the mount target.
A subnet ID, which determines the following:
The VPC in which Amazon EFS creates the mount target
The Availability Zone in which Amazon EFS creates the mount target
The IP address range from which Amazon EFS selects the IP address of the mount target (if you don't specify an IP address in the request)
After creating the mount target, Amazon EFS returns a response that includes, a MountTargetId
and an IpAddress. You use this IP address when mounting the file system in
an EC2 instance. You can also use the mount target's DNS name when mounting the file
system. The EC2 instance on which you mount the file system by using the mount target
can resolve the mount target's DNS name to its IP address. For more information, see
How
it Works: Implementation Overview.
Note that you can create mount targets for a file system in only one VPC, and there can be only one mount target per Availability Zone. That is, if the file system already has one or more mount targets created for it, the subnet specified in the request to add another mount target must meet the following requirements:
Must belong to the same VPC as the subnets of the existing mount targets
Must not be in the same Availability Zone as any of the subnets of the existing mount targets
If the request satisfies the requirements, Amazon EFS does the following:
Creates a new mount target in the specified subnet.
Also creates a new network interface in the subnet as follows:
If the request provides an IpAddress, Amazon EFS assigns that IP address to
the network interface. Otherwise, Amazon EFS assigns a free address in the subnet
(in the same way that the Amazon EC2 CreateNetworkInterface call does when
a request does not specify a primary private IP address).
If the request provides SecurityGroups, this network interface is associated
with those security groups. Otherwise, it belongs to the default security group for
the subnet's VPC.
Assigns the description Mount target fsmt-id for file system fs-id where fsmt-id is the mount target ID, and fs-id
is the FileSystemId.
Sets the requesterManaged property of the network interface to true,
and the requesterId value to EFS.
Each Amazon EFS mount target has one corresponding requester-managed EC2 network interface.
After the network interface is created, Amazon EFS sets the NetworkInterfaceId
field in the mount target's description to the network interface ID, and the IpAddress
field to its address. If network interface creation fails, the entire CreateMountTarget
operation fails.
The CreateMountTarget call returns only after creating the network interface,
but while the mount target state is still creating, you can check the mount
target creation status by calling the DescribeMountTargets operation, which
among other things returns the mount target state.
We recommend that you create a mount target in each of the Availability Zones. There are cost considerations for using a file system in an Availability Zone through a mount target created in another Availability Zone. For more information, see Amazon EFS. In addition, by always using a mount target local to the instance's Availability Zone, you eliminate a partial failure scenario. If the Availability Zone in which your mount target is created goes down, then you can't access your file system through that mount target.
This operation requires permissions for the following action on the file system:
elasticfilesystem:CreateMountTarget
This operation also requires permissions for the following Amazon EC2 actions:
ec2:DescribeSubnets
ec2:DescribeNetworkInterfaces
ec2:CreateNetworkInterface
For .NET Core this operation is only available in asynchronous form. Please refer to CreateMountTargetAsync.
Namespace: Amazon.ElasticFileSystem
Assembly: AWSSDK.ElasticFileSystem.dll
Version: 3.x.y.z
public virtual CreateMountTargetResponse CreateMountTarget( CreateMountTargetRequest request )
Container for the necessary parameters to execute the CreateMountTarget service method.
| Exception | Condition |
|---|---|
| AvailabilityZonesMismatchException | Returned if the Availability Zone that was specified for a mount target is different from the Availability Zone that was specified for One Zone storage. For more information, see Regional and One Zone storage redundancy. |
| BadRequestException | Returned if the request is malformed or contains an error such as an invalid parameter value or a missing required parameter. |
| FileSystemNotFoundException | Returned if the specified FileSystemId value doesn't exist in the requester's Amazon Web Services account. |
| IncorrectFileSystemLifeCycleStateException | Returned if the file system's lifecycle state is not "available". |
| InternalServerErrorException | Returned if an error occurred on the server side. |
| IpAddressInUseException | Returned if the request specified an IpAddress that is already in use in the subnet. |
| MountTargetConflictException | Returned if the mount target would violate one of the specified restrictions based on the file system's existing mount targets. |
| NetworkInterfaceLimitExceededException | The calling account has reached the limit for elastic network interfaces for the specific Amazon Web Services Region. Either delete some network interfaces or request that the account quota be raised. For more information, see Amazon VPC Quotas in the Amazon VPC User Guide (see the Network interfaces per Region entry in the Network interfaces table). |
| NoFreeAddressesInSubnetException | Returned if IpAddress was not specified in the request and there are no free IP addresses in the subnet. |
| SecurityGroupLimitExceededException | Returned if the size of SecurityGroups specified in the request is greater than five. |
| SecurityGroupNotFoundException | Returned if one of the specified security groups doesn't exist in the subnet's virtual private cloud (VPC). |
| SubnetNotFoundException | Returned if there is no subnet with ID SubnetId provided in the request. |
| UnsupportedAvailabilityZoneException | Returned if the requested Amazon EFS functionality is not available in the specified Availability Zone. |
This operation creates a new mount target for an EFS file system.
var client = new AmazonElasticFileSystemClient();
var response = client.CreateMountTarget(new CreateMountTargetRequest
{
FileSystemId = "fs-01234567",
SubnetId = "subnet-1234abcd"
});
string fileSystemId = response.FileSystemId;
string ipAddress = response.IpAddress;
string lifeCycleState = response.LifeCycleState;
string mountTargetId = response.MountTargetId;
string networkInterfaceId = response.NetworkInterfaceId;
string ownerId = response.OwnerId;
string subnetId = response.SubnetId;
.NET Framework:
Supported in: 4.5, 4.0, 3.5