Creates a mount target for a file system. You can then mount the file system on EC2 instances by using the mount target.
efs_create_mount_target(FileSystemId, SubnetId, IpAddress,
SecurityGroups)[required] The ID of the file system for which to create the mount target.
[required] The ID of the subnet to add the mount target in.
Valid IPv4 address within the address range of the specified subnet.
Up to five VPC security group IDs, of the form sg-xxxxxxxx. These must
be for the same VPC as subnet specified.
svc$create_mount_target(
FileSystemId = "string",
SubnetId = "string",
IpAddress = "string",
SecurityGroups = list(
"string"
)
)
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. For more information, see Amazon EFS: How it Works.
In the request, you also specify a file system ID for which you are
creating the mount target and the file system's lifecycle state must be
available. For more information, see DescribeFileSystems.
In the request, you also provide a subnet ID, which determines the following:
VPC in which Amazon EFS creates the mount target
Availability Zone in which Amazon EFS creates the mount target
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 <i>fsmt-id</i> for file system <i>fs-id</i>
where <i>fsmt-id</i> is the mount target ID, and
<i>fs-id</i> 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
# NOT RUN {
# This operation creates a new mount target for an EFS file system.
# }
# NOT RUN {
svc$create_mount_target(
FileSystemId = "fs-01234567",
SubnetId = "subnet-1234abcd"
)
# }
# NOT RUN {
# }
Run the code above in your browser using DataLab