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support/azure/virtual-machines/linux/linux-fulldisk-boot-error.md

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ms.author: pagienge
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ms.reviewer: v-leedennis
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ms.topic: troubleshooting
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ms.date: 09/01/2023
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ms.date: 09/15/2025
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ms.service: azure-virtual-machines
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ms.custom: sap:My VM is not booting, linux-related-content
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ms.collection: linux

support/azure/virtual-machines/linux/linux-hyperv-issue.md

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ms.author: saimsh
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ms.reviewer: divargas
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ms.topic: troubleshooting
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ms.date: 10/11/2022
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ms.date: 09/15/2025
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ms.service: azure-virtual-machines
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ms.custom: sap:My VM is not booting, linux-related-content
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ms.collection: linux
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## Before you troubleshoot
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To troubleshoot [Scenario 1: Network Hyper-V driver is disabled](#network-hyperv-disabled) and [Scenario 2: NIC mac address is changed or doesn't match](#macaddress-issue), you need [serial console](./serial-console-linux.md) access for your Linux VM.
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To troubleshoot [Scenario 1: Network Hyper-V driver is disabled](#network-hyperv-disabled) and [Scenario 2: NIC media access control (MAC) address is changed or doesn't match](#macaddress-issue), you need [serial console](./serial-console-linux.md) access for your Linux VM.
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If you don't have serial console access, follow the [offline approach](./repair-linux-vm-using-azure-virtual-machine-repair-commands.md) to access the contents of the problematic OS disk from a rescue virtual machine. Access to Azure CLI or [Azure Cloud Shell](https://shell.azure.com) is required for the offline approach.
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4. Once the changes are applied, perform an automatic OS disk swap with the original VM and reboot the system by using the `az vm repair restore` command.
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## <a id="macaddress-issue"></a>Scenario 2: NIC MAC address is changed or doesn't match
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## <a id="macaddress-issue"></a>Scenario 2: NIC media access control (MAC) address is changed or doesn't match
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If the Network Interface Card MAC address is changed or doesn't match within the OS configuration, you won't be able to SSH to the VM because the networking services are unavailable. You're still able to sign in via [serial console](../windows/serial-console-overview.md) from the Azure portal. Errors that are similar to the ones in [Scenario 1: Network Hyper-V driver is disabled](#network-hyperv-disabled) are displayed.
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support/azure/virtual-machines/linux/linux-image-provisioning-agent-update-awareness.md

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---
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title: Linux Image Provisioning Agent update awareness
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description: Provides the update awareness and frequently asked questions about Linux Image Provisioning Agent.
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ms.date: 10/10/2020
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ms.date: 09/15/2025
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ms.service: azure-virtual-machines
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ms.custom: sap:VM Extensions not operating correctly, linux-related-content
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ms.collection: linux

support/azure/virtual-machines/linux/linux-recovery-cannot-start-file-system-errors.md

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ms.workload: infrastructure-services
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ms.tgt_pltfrm: vm-linux
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ms.devlang: azurecli
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ms.date: 05/20/2025
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ms.date: 09/15/2025
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ms.author: jarrettr
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ms.reviewer: maries, v-weizhu
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---
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EXT4-fs warning (device sda1): ext4_clear_journal_err:4532: Marking fs in need of filesystem check.
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```
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### Example 2: Fail to mount ext Logical Volume Manager (LVM) device
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### Example 2: Fail to mount ext4 Logical Volume Manager (LVM) device
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```output
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[ 14.382472] EXT4-fs error (device dm-0): ext4_iget:4398: inode #8: comm mount: bad extra_isize 4060 (inode size 256)

support/azure/virtual-machines/linux/oom-swap-file-linux-vm.md

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title: Out of memory error occurs in Linux Azure virtual machine
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description: This article helps you understand how to fix out of memory errors by adding swap space in Linux Azure virtual machines.
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ms.date: 10/27/2023
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ms.date: 09/15/2025
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ms.reviewer: azurevmlnxcic, v-denlee
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ms.service: azure-virtual-machines
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ms.custom: sap:VM Admin - Windows (Guest OS), linux-related-content

support/azure/virtual-machines/linux/repair-linux-vm-using-azure-virtual-machine-repair-commands.md

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ms.workload: infrastructure-services
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ms.tgt_pltfrm: vm-linux
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ms.devlang: azurecli
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ms.date: 04/29/2025
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ms.date: 09/15/2025
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ms.author: jarrettr
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---
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> * Only one script may run at a time.
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> * A running script cannot be canceled.
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> * The maximum time a script can run is 90 minutes, after which it will time out.
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> * Do not modify the tags that are created on the repair VM. The tags are neccessary for the restore command to function correctly.
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> * Do not modify the tags that are created on the repair VM. The tags are necessary for the restore command to function correctly.
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> * For VMs using Azure Disk Encryption, only managed disks encrypted with single pass encryption (with or without KEK) are supported.
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> * The VM Contributor role doesn't provide enough permissions to run the scripts, as they require permissions to read, write, and delete resources in the resource group that includes the target VM. Therefore roles such as Contributor or Owner at that resource group level is required.
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support/azure/virtual-machines/linux/reset-password.md

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ms.workload: infrastructure-services
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ms.tgt_pltfrm: vm-linux
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ms.topic: how-to
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ms.date: 12/04/2023
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ms.date: 09/15/2025
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ms.reviewer: msaenzbo, divargas, v-six
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---
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2. Make sure that password authentication is enabled on the OpenSSH server if you try to log in to the server by using the SSH and password authentication.
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1. Check whether the `PasswordAuthentitcation` value is set to `yes` or `no` in `/etc/ssh/sshd_config` by running the following command:
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1. Check whether the `PasswordAuthentication` value is set to `yes` or `no` in `/etc/ssh/sshd_config` by running the following command:
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```bash
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egrep "^PasswordAuthentication" /etc/ssh/sshd_config
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3. Make sure that password authentication is enabled on the OpenSSH server if you try to log in to the server by using the SSH and password authentication.
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1. Check whether the `PasswordAuthentitcation` value is set to `yes` or `no` in `/etc/ssh/sshd_config` by running the following command:
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1. Check whether the `PasswordAuthentication` value is set to `yes` or `no` in `/etc/ssh/sshd_config` by running the following command:
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```bash
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egrep "^PasswordAuthentication" /etc/ssh/sshd_config

support/azure/virtual-machines/linux/resolve-failed-start-switch-root-azure-linux-vm.md

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ms.date: 08/19/2021
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ms.date: 09/15/2025
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# Resolve "Failed to start Switch Root" for an Azure Linux VM
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2. Select the entry for the rescue kernel.
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3. Copy the `kernelopts` value from the `grubenv` file. The path of the `grubenv` file in Linux can vary depending on the distribution and configuration of the system. It is commonly located at `/boot/efi/EFI/redhat/grubenv` or `/boot/grub2/gubenv`.
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3. Copy the `kernelopts` value from the `grubenv` file. The path of the `grubenv` file in Linux can vary depending on the distribution and configuration of the system. It is commonly located at `/boot/efi/EFI/redhat/grubenv` or `/boot/grub2/grubenv`.
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```console
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cat /boot/grub2/grubenv
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`mount /dev/sdc15 /repair/efi/`
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7. Copy the `kernelopts` value from the `grubenv` file. The path of the `grubenv` file in Linux can vary depending on the distribution and configuration of the system. It is commonly located at `/boot/efi/EFI/redhat/grubenv` or `/boot/grub2/gubenv`.
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7. Copy the `kernelopts` value from the `grubenv` file. The path of the `grubenv` file in Linux can vary depending on the distribution and configuration of the system. It is commonly located at `/boot/efi/EFI/redhat/grubenv` or `/boot/grub2/grubenv`.
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Example:
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support/azure/virtual-machines/linux/troubleshoot-recovery-disks-linux.md

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ms.date: 10/11/2021
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ms.date: 09/15/2025
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---
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support/azure/virtual-machines/linux/troubleshoot-recovery-disks-portal-linux.md

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ms.date: 09/15/2025
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---
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Select your VM in the portal and then scroll down to the **Support + Troubleshooting** section. Click **Boot diagnostics** to view the console messages streamed from your VM. Review the console logs to see if you can determine why the VM is encountering an issue. The following example shows a VM stuck in maintenance mode that requires manual interaction:
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:::image type="content" source="media/troubleshoot-recovery-disks-portal-linux/boot-diagnostics-console-logs.png" alt-text="Screenshot of viewing the V M boot diagnostics console logs.":::
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:::image type="content" source="media/troubleshoot-recovery-disks-portal-linux/boot-diagnostics-console-logs.png" alt-text="Screenshot of viewing the VM boot diagnostics console logs.":::
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You can also click **Screenshot** across the top of the boot diagnostics log to download a capture of the VM screenshot.
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#Provide the name of the snapshot that will be used to create Managed Disks
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#Provide the name of the Managed Disk
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#Provide the size of the disks in GB. It should be greater than the VHD file size. In this sample, the size of the snapshot is 127 GB. So we set the disk size to 128 GB.
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> The following examples detail the steps required on an Ubuntu VM. If you are using a different Linux distro, such as Red Hat Enterprise Linux or SUSE, the log file locations and `mount` commands may be a little different. Refer to the documentation for your specific distro for the appropriate changes in commands.
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1. SSH to your troubleshooting VM using the appropriate credentials. If this disk is the first data disk attached to your troubleshooting VM, it is likely connected to `/dev/sdc`. Use `dmseg` to list attached disks:
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1. SSH to your troubleshooting VM using the appropriate credentials. If this disk is the first data disk attached to your troubleshooting VM, it is likely connected to `/dev/sdc`. Use `dmesg` to list attached disks:
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2. Now detach the virtual hard disk from the VM. Select your VM in the portal and click **Disks**. Select your existing virtual hard disk and then click **Detach**:
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:::image type="content" source="media/troubleshoot-recovery-disks-portal-linux/detach-disk.png" alt-text="Screenshot to detach the virtual hard disk from the V M.":::
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:::image type="content" source="media/troubleshoot-recovery-disks-portal-linux/detach-disk.png" alt-text="Screenshot to detach the virtual hard disk from the VM.":::
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## Swap the OS disk for the VM
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Azure portal now supports change the OS disk of the VM. To do this, follow these steps:
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1. Go to [Azure portal](https://portal.azure.com). Select **Virtual machines** from the sidebar, and then select the VM that has problem.
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1. Go to [Azure portal](https://portal.azure.com). Select **Virtual machines** from the sidebar, and then select the VM that has a problem.
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1. On the left pane, select **Disks**, and then select **Swap OS disk**.
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:::image type="content" source="media/troubleshoot-recovery-disks-portal-linux/swap-os-disk.png" alt-text="Screenshot of the Swap O S Disk option in the Azure portal.":::

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