Cloudera Docs

Mixed mode minor RHEL OS upgrade on the ECS hosts

After installing CDP Private Cloud Data Services on a particular RHEL OS, you can now upgrade RHEL OS on some of your hosts to a new minor version. For example, in a 10 node cluster running in a RHEL 8.x OS series, you can upgrade any number of hosts from 8.6 to 8.8 new minor version and keep the other hosts running on original RHEL 8.x.

You must perform this task on all Embedded Container Service (ECS) hosts.
  1. Log in to Cloudera Manager as an Administrator, then navigate to the ECS cluster.
  2. Go to the Home > Status tab.
  3. Click the Actions menu to the right of the Embedded Container Service cluster name and select Stop.
  4. Click the Stop button in the confirmation screen.

    The Command Details window shows the progress of the services.

  5. SSH into a ECS cluster host as a root user.
  6. Verify the OS version by running the following command: 
    cat /etc/redhat-release
  1. Upgrade RHEL from the installed version to the desired minor version on the ECS host you want to upgrade. Use the operating system upgrade procedures provided by your RedHat operating system vendor to download and upgrade RHEL.
    For example, you can upgrade from RHEL 8.6 version to RHEL 8.8 minor version.
  2. Verify the upgraded OS version by running the following command: 
    cat /etc/redhat-release
  3. Log in to Cloudera Manager as an Administrator.
  4. Go to the Home > Status tab.
  5. Click the Actions menu to the right of the Embedded Container Service cluster name and select Start.
  6. Click the Start button that appears in the next screen to confirm.
    The Command Details window shows the progress of the services.
    Wait for all the pods to start. The wait time depends on the number of nodes in the cluster.