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Detaching a file storage from a VM

Written by
Updated at October 17, 2024

  1. Unmount the file storage from the VM:

    1. Connect to the VM over SSH.

    2. If you had added a line to the /etc/fstab file to automatically mount a file storage to the VM at startup (for example, when attaching a storage to the VM), delete this line.

    3. Run this command:

      sudo umount <mounting_path>

    4. To check that your file storage has been unmounted, run this command:

      df -T

      As a result, there should be no virtiofs type file system corresponding to the file storage:

      Filesystem        Type         1K-blocks    Used Available Use% Mounted on
udev              devtmpfs        988600       0    988600   0% /dev
tmpfs             tmpfs           203524     780    202744   1% /run
/dev/vda2         ext4          13354932 1909060  10861420  15% /
tmpfs             tmpfs          1017604       0   1017604   0% /dev/shm
tmpfs             tmpfs             5120       0      5120   0% /run/lock
tmpfs             tmpfs          1017604       0   1017604   0% /sys/fs/cgroup
tmpfs             tmpfs           203520       0    203520   0% /run/user/1000

  2. Stop the VM.

  3. Detach the file storage from the VM in Compute Cloud:

    1. In the management console, select the folder where your file storage is located.
    2. Select Compute Cloud.
    3. In the left-hand panel, select File storages.
    4. Select the required storage.
    5. Go to the Virtual machines tab.
    6. In the line of the appropriate VM, click and select Detach file storage.
    7. In the window that opens, confirm the detach operation.

    If you do not have the Yandex Cloud command line interface yet, install and initialize it.

    The folder specified in the CLI profile is used by default. You can specify a different folder using the --folder-name or --folder-id parameter.

    1. View the description of the CLI command to attach a file storage to a VM:

      yc compute instance detach-filesystem --help

    2. Get a list of file storages in the default folder:

      yc compute filesystem list

      Result:

      +----------------------+-------------------+------------+---------------+--------+-------------+
|          ID          |        NAME       |    SIZE    |     ZONE      | STATUS | DESCRIPTION |
+----------------------+-------------------+------------+---------------+--------+-------------+
| epdtcr9blled******** | first-filesystem  | 1073741824 | ru-central1-a | READY  |             |
| epd3f4gv8bs4******** | second-filesystem | 1073741824 | ru-central1-a | READY  |             |
+----------------------+-------------------+------------+---------------+--------+-------------+

    3. Get a list of VMs in the default folder:

      yc compute instance list

      Result:

      +----------------------+-------+---------------+---------+--------------+-------------+
|          ID          | NAME  |    ZONE ID    | STATUS  |  EXTERNAL IP | INTERNAL IP |
+----------------------+-------+---------------+---------+--------------+-------------+
| epdj4upltbiv******** | vm-01 | ru-central1-a | RUNNING | 51.250.**.** | 192.168.*.* |
| 1pc3088tkv4m******** | vm-02 | ru-central1-a | RUNNING | 84.201.**.** | 192.168.*.* |
+----------------------+-------+---------------+---------+--------------+-------------+

    4. Detach a file storage from a VM:

      yc compute instance detach-filesystem \
  --id <VM_ID> \
  --filesystem-id <file_storage_ID>

      Where:

      • --id: VM ID.

        Instead of an ID, you can specify the VM name in the --name parameter.

      • --filesystem-id: File storage ID.

        Instead of an ID, you can specify the file storage name in the --filesystem-name parameter.

      As a result, the command will output the updated VM configuration. The detached file storage must not be featured in the filesystems section of the resulting configuration.

    If you don't have Terraform, install it and configure the Yandex Cloud provider.

    Set the allow_stopping_for_update parameter to true on your VM, if you have not done it yet.

    1. Open the Terraform configuration file and delete the fragment with the storage description:

      Sample storage description in the VM configuration in Terraform
      ...
resource "yandex_compute_instance" "vm-1" {

   name        = "test-vm"
   platform_id = "standard-v3"
   zone        = "ru-central1-a"

   filesystem {
      filesystem_id = "fhmaikp755gr********"
   }
...

    2. Apply the changes:

      1. In the terminal, change to the folder where you edited the configuration file.

      2. Make sure the configuration file is correct using the command:

        terraform validate

        If the configuration is correct, the following message is returned:

        Success! The configuration is valid.

      3. Run the command:

        terraform plan

        The terminal will display a list of resources with parameters. No changes are made at this step. If the configuration contains errors, Terraform will point them out.

      4. Apply the configuration changes:

        terraform apply

      5. Confirm the changes: type yes in the terminal and press Enter.

    You can check that the storage has been detached from the VM using the management console or this CLI command:

    yc compute instance get <VM_name>

    Use the detachFilesystem REST API method for the Instance resource or the InstanceService/DetachFilesystem gRPC API call.

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Attaching a file storage to a VM
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Updating a file storage