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Deployment Guide—Dell EMC Ready Stack for Red Hat OpenShift Container Platform 4.6
Deploying OpenShift 4.6
Introduction Creating a bootstrap KVM Installing control-plane nodes Completing the bootstrap setup Installing compute nodes Completing the cluster setup Removing the bootstrap node Accessing the OpenShift web console OpenShift license and support Configuring authentication Adding a compute node

Adding a compute node

  • Compute nodes in OpenShift Container Platform 4.6 can run Red Hat CoreOS or Red Hat Enterprise Linux 7.9.

    Note: Red Hat does not support running Red Hat Enterprise Linux 8.x on a compute node.

    Modify the nodes YAML file

    To modify the file:

    1. Add a new_compute_nodes key in nodes.yaml file. Under the new_compute_nodes key, add information manually by specifying values such as hostname, IP address for ip_os, IP address for ip_idrac, and supported os.

    Note: Supported values for the operating system are rhel and rhcos. The following example uses a Red Hat Enterprise Linux compute node. To find out which values to specify, see this sample file in GitHub.

    new_compute_nodes:

      - name: compute-3

        ip_os: 192.168.46.27

        ip_idrac: 192.168.34.27

        os: rhel

    Note: On the CSAH node, run the commands as user ansible unless otherwise specified.

    1. Execute the python script to add the new compute nodes into inventory file

    [ansible@csah python]$ pwd

    /home/ansible/openshift-bare-metal/python

    [ansible@csah python]$ python3 generate_inventory_file.py --add --ver 4.6 --nodes nodes.yaml --id_user <idrac user> --id_pass <idrac_password>

    Enter complete path to existing inventory file: /home/ansible/openshift-bare-metal/ansible/generated_inventory

    Do you want to perform bonding for 'new_compute_nodes' (y/NO): y

    Note: Specify the bonding information as appropriate. An updated inventory file is created with new compute nodes information added

    1. Run the playbook to create kickstart files, update DNS entries, and set up PXE for the new compute node:

    [ansible@csah ansible]$ pwd

    /home/ansible/openshift-bare-metal/ansible

    [ansible@csah ansible]$ ansible-playbook -i <updated inventory file> ocp.yaml

    1. Follow the steps that are described in Installing compute nodes.