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Attach Volume

Attach Volume to VM​

Attaching a volume to a virtual machine (VM) in Vietnix Cloud allows you to expand the storage capacity of your instance. This guide will walk you through the steps to attach a volume to your VM.

Prerequisites​

Steps to Attach Volume to VM​

  1. Navigate to the Compute section and select Volumes. Navigate to Volumes
  2. Find the volume you want to attach and click on it. Select Volume
  3. Click the Attach Volume button.
  4. In the dialog, select the instance (VM) you want to attach the volume to from the dropdown menu. Attach Volume Dialog
  5. Click Done to attach the volume. Attached Volume
  6. The volume will now be attached to the selected instance. You can verify this by checking the instance's details or by using SSH to log in to the instance and running the lsblk command to see the attached volume.

Mount Volume inside VM​

After attaching a volume to your instance, you need to mount it to make it accessible. Follow these steps to mount the volume.

Requisites​

Steps to Mount Volume inside VM​

Step 1: Identify the Volume​

First, identify the volume device name:

# List all block devices
lsblk

# Or use fdisk to list devices
sudo fdisk -l

Step 2: Create Mount Point​

Create a directory where you want to mount the volume:

# Create mount directory
sudo mkdir /mnt/myvolume

# Or use any directory you prefer
sudo mkdir /data
sudo mkdir /home/user/storage

Step 3: Mount the Volume​

Mount the volume to the created directory:

# Mount the volume
sudo mount /dev/vdb1 /mnt/myvolume

# Verify the mount
df -h

Step 4: Set Permissions​

Set appropriate permissions for the mounted volume:

# Change ownership
sudo chown user:user /mnt/myvolume

# Set permissions
sudo chmod 755 /mnt/myvolume

Auto-mount on Boot​

To automatically mount the volume when the system boots:

Step 1: Get Volume UUID​

# Get the UUID of the volume
sudo blkid /dev/vdb1

Step 2: Add to fstab​

Edit the /etc/fstab file:

sudo nano /etc/fstab

Add this line (replace UUID with actual UUID):

UUID=your-uuid-here /mnt/myvolume ext4 defaults 0 2

Step 3: Test fstab​

Test the fstab configuration:

# Test mount without actually mounting
sudo mount -a

# If successful, the volume will be mounted
df -h

Mount Options​

You can specify different mount options:

Default Options​

sudo mount /dev/vdb1 /mnt/myvolume

With Specific Options​

# Mount with specific options
sudo mount -o rw,user,exec /dev/vdb1 /mnt/myvolume

# Mount with noatime (faster access times)
sudo mount -o noatime /dev/vdb1 /mnt/myvolume

Common Mount Options​

  • rw: Read-write access
  • ro: Read-only access
  • noatime: Don't update access times
  • user: Allow non-root users to mount
  • exec: Allow execution of binaries
  • noexec: Prevent execution of binaries

Unmounting Volume​

To unmount a volume:

# Unmount the volume
sudo umount /mnt/myvolume

# Or unmount by device
sudo umount /dev/vdb1

Troubleshooting​

Common Issues​

  1. Device busy: Make sure no processes are using the volume
  2. Permission denied: Check file system permissions
  3. Wrong file system: Verify the file system type

Commands for Troubleshooting​

# Check what's using the volume
sudo lsof /mnt/myvolume

# Check mount status
mount | grep vdb

# Check file system
sudo fsck /dev/vdb1

# Force unmount (use with caution)
sudo umount -f /mnt/myvolume

Best Practices​

  1. Use UUID: Always use UUID in fstab instead of device names
  2. Backup fstab: Make a backup before editing fstab
  3. Test mounts: Always test mount commands before adding to fstab
  4. Proper permissions: Set appropriate ownership and permissions
Support

If you encounter any issues, contact our support team at support.vietnix.vn

New Days New Knowledge​