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Chapter 29. Configuring kdump in the web console

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You can set up and test the kdump configuration by using the RHEL 9 web console. The web console can enable the kdump service at boot time. Furthermore, the web console enables you to configure the reserved memory for kdump and to select the vmcore saving location in an uncompressed or compressed format.

29.1. Configuring kdump memory usage and target location in web console

You can configure the memory reserve for the kdump kernel and also specify the target location to capture the vmcore dump file with the RHEL web console interface.

Prerequisites

Procedure

  1. In the web console, open the Kernel dump tab and start the kdump service by setting the Kernel crash dump switch to on.
  2. Configure the kdump memory usage in the terminal, for example:

    $ sudo grubby --update-kernel ALL --args crashkernel=512M

    Restart the system to apply the changes.

  3. In the Kernel dump tab, click Edit at the end of the Crash dump location field.

    Kdump page in the web console
  4. Specify the target directory for saving the vmcore dump file:

    • For a local filesystem, select Local Filesystem from the drop-down menu.

      Location for saving vmcore
    • For a remote system by using the SSH protocol, select Remote over SSH from the drop-down menu and specify the following fields:

      • In the Server field, enter the remote server address.
      • In the SSH key field, enter the SSH key location.
      • In the Directory field, enter the target directory.
    • For a remote system by using the NFS protocol, select Remote over NFS from the drop-down menu and specify the following fields:

      • In the Server field, enter the remote server address.
      • In the Export field, enter the location of the shared folder of an NFS server.
      • In the Directory field, enter the target directory.

        Note

        You can reduce the size of the vmcore file by selecting the Compression checkbox.

  5. Optional: Display the automation script by clicking View automation script.

    A window with the generated script opens. You can navigate between a shell script and an Ansible playbook generation options tab.

  6. Optional: Copy the script by clicking Copy to clipboard.

    You can use this script to apply the same configuration on multiple machines.

Verification

  1. Click Test configuration.

    Test configuration of kdump
  2. Click Crash system under Test kdump settings.

    Warning

    When you initiate the system crash, the kernel operation stops and results in a system crash with data loss.

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