Terraform ebs nvme

Good work Sanjay, this really saved me a bunch of time after I ran into an Ansible bug that prevented me from doing this. How do you know that the attached volume name would be xvdg It could be anything and that depends on AMI in aws. Hi Sanjeev This will work if you are creating a new ec2 instance. But if it is stopped or terminated how are you ensuring that it is mounted back.

Thanks, Sanjeev. It worked well in To me it looks most simplest approach while Google search provides many complicated options for a simple goal. The reason is that AWS assigns the block device name for you and it can be a bit unpredictable:.

terraform ebs nvme

Previous post: Download speed : vagrant init vs wget vs aria2. All rights reserved. Check already mounted devices. Look for the file system. Make file systems. Creating filesystem with 4k blocks and inodes.

Filesystem UUID : d3e35fa3 - 8e15 - - 8d9e - 8c62df Superblock backups stored on blocks :. Allocating group tables : done.

Writing inode tables : done. Creating journal blocks : done. Writing superblocks and filesystem accounting information : done. Check if they are showing up. Add entry to fstab. Really helpful Reply. Thanks Kumar Reply. Add an entry to the fstab file.

The commands worked for helped me mount my ebs volume. Thanks for putting out this knowledge. Cancel reply Leave a Comment. Get in touch with me.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am new to terraform, have created 3 ec2 instances, and i have created 6 ebs volume.

How do we attach 2 ebs volumes to each of the three instances? One way to approach this problem, and how I would solve it, is to attach the ebs volumes directly to the instance resource. For example, each server resource you wished to add 2 ebs block devices to, would look like:. Then run terraform plansee that the block devices will be added to the servers and the servers.

If this is acceptable, run terraform apply to rebuild the servers with the additional volumes. Learn more. Terraform ebs volume Ask Question. Asked 3 years, 7 months ago. Active 1 year, 8 months ago. Viewed 9k times. Create 6 EBS volumes and attach 2 per instance. Can you clarify what you're asking? But the below code is creating only 2 ebs volumes. This sentence seems unfinished, what was the expected outcome of the code snippet you pasted?

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Is it not applying the different types correctly? Are you asking for help with additional code to associate it with an EC2 instance? Active Oldest Votes. Note: this method will destroy and recreate the servers. Use 'aws volume attachment' method if this is unacceptable to you.

Budris Mr. Budris 4 4 silver badges 17 17 bronze badges. I've updated my answer to reflect this. The best way to add additonal volumes without recreating the server is to define another volume and use a volume attachment, as in the accepted answer. Budris Feb 24 '18 at Budris: Thanks.

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terraform ebs nvme

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These drivers typically discover attached devices by scanning the PCI bus during instance boot, and create device nodes based on the order in which the devices respond, not on how the devices are specified in the block device mapping.

You can pass a disk number to enumerate information for a specific device. You can also download ebsnvme-id. However, if you resize your root volume on a Windows system, you must rescan the volume in order for this change to be reflected in the instance. On Windows systems, the default timeout is 60 seconds and the maximum is seconds.

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Terraform in 16 Minutes : Provision EC2 on AWS - Step by Step guide for beginners

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terraform ebs nvme

Sign in to your account. It was migrated here as a result of the provider split. The original body of the issue is below. Terraform creates the instance with wrong disk order, being the secondary disk nvme1n1 of GB and the tertiary disk nvme2n1 of 80GB.

It depends on the AMI. I have the same problem trying to create m5. I also tried to create these instances manually at AWS, and the problem is still the same. I changed my instance type from m5.

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Same issue here. As I'm creating from snapshots, I've just ended up labelling the devices first e. I ran into this same issue and discussions with AWS have uncovered that the ordering of disk device naming is not guaranteed to remain the same as defined at build time. This has to do with device discovery by the AMI, the order they are discovered determines the device name assigned. I have had to implement some custom scripting that runs from user-data to map the devices as defined in terraform to the actual mount points on the host.

Block-device ordering on the actual machine is consistent but out of order.

terraform ebs nvme

This seems to have been the case for a while. I back-revisioned to a 1. The difference is that the older instance types that still use SCSI emulation e. This may represent a bug in both the Terraform provider and AWS - that the disks are created out of order, and that the hypervisor does not respect the requested name order.

Here's the output for that section from aws autoscaling describe-launch-configurationnote that it's an array and the order it's in:. Here's the output of lsblk from a c5. As you can see, the in-OS ordering reflects the ordering of the BlockDeviceMappings array, which is out-of-order WRT the desired arrangement expressed in the Terraform resource.

This does not happen on older instance types e. That means a list of its members is sorted by their hasheswhich produces the predictably-misordered BlockDeviceMappings in AWS. Since the newest AWS instances are ordering their block devices by this array's order and not by the naming schema, we have what's happening above.

I'm not tooled up to test different versions of this code and don't know whether switching to schema. I always thought it was weird that my block devices looked out of order in the console and in terraform plan output. Now I know. There is someone that have tried to solve this issue like this. I have not tried it but have solved it that way manually.

I have used the script here to upgrade c4 to c5 and t2 to t3. Here is some more info that the example uses to identify the right volume by aws volume-id and attaches the right device with UUID. Bad news.The block device driver can assign NVMe device names in a different order than you specified for the volumes in the block device mapping.

For more information, see Summary of networking and storage features. You can confirm that your instance has the NVMe driver and check the driver version using the following command. If the instance has the NVMe driver, the command returns information about the driver.

If your instance has the NVMe driver, you can update the driver to the latest version using the following procedure. Ubuntu Upgrade the linux-aws package to receive the latest version as follows:. For Ubuntu These devices rely on standard NVMe drivers on the operating system. These drivers typically discover attached devices by scanning the PCI bus during instance boot, and create device nodes based on the order in which the devices respond, not on how the devices are specified in the block device mapping.

Occasionally, devices can respond to discovery in a different order in subsequent instance starts, which causes the device name to change. We recommend that you use stable identifiers for your EBS volumes within your instance, such as one of the following:. When a device is formatted, a UUID is generated that persists for the life of the filesystem.

A device label can be specified at the same time. Starting with FreeBSD Pass either the name of the NVMe device for example, nvme0 or the disk device for example, nvd0 or nda0. With a kernel version of 4. First, install the NVMe command line package, nvme-cliusing the package management tools for your Linux distribution. For download and installation instructions for other distributions, refer to the documentation specific to your distribution.

The following example gets the volume ID and device name. The device name is available through the NVMe controller vendor-specific extension bytes of the controller identification :. The lsblk command lists available devices and their mount points if applicable. This helps you determine the correct device name to use.

If you are using Linux kernel 4. For older Linux kernels, you might need to detach and attach the EBS volume or reboot the instance for the size change to be reflected. With Linux kernel 3. When you detach an NVMe EBS volume, the instance does not have an opportunity to flush the file system caches or metadata before detaching the volume.

If the volume fails to detach, you can attempt a force-detach command as described in Detaching an Amazon EBS volume from a Linux instance. For most Linux kernels earlier than version 4. In some cases, your filesystem might be remounted as read-only. For current kernels, the maximum iswhile for earlier kernels the maximum is Depending on the version of Linux, the timeout might already be set to the supported maximum value.

Terraform – Mount EBS volume as part of user_data on an linux EC2 machine

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Thanks for letting us know this page needs work. We're sorry we let you down. If you've got a moment, please tell us how we can make the documentation better. To update the NVMe driver If your instance has the NVMe driver, you can update the driver to the latest version using the following procedure. Connect to your instance.It puts more validity on each signature.

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