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7.5. Preparing a RHEL compute node

Before you add a Red Hat Enterprise Linux (RHEL) machine to your OpenShift Container Platform cluster, you must register each host with Red Hat Subscription Manager (RHSM), attach an active OpenShift Container Platform subscription, and enable the required repositories.

  1. On each host, register with RHSM: 

    # subscription-manager register --username=<user_name> --password=<password>
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  2. Pull the latest subscription data from RHSM: 

    # subscription-manager refresh
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  3. List the available subscriptions: 

    # subscription-manager list --available --matches '*OpenShift*'
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  4. In the output for the previous command, find the pool ID for an OpenShift Container Platform subscription and attach it: 

    # subscription-manager attach --pool=<pool_id>
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  5. Disable all yum repositories:

    1. Disable all the enabled RHSM repositories: 

      # subscription-manager repos --disable="*"
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    2. List the remaining yum repositories and note their names under repo id, if any: 

      # yum repolist
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    3. Use yum-config-manager to disable the remaining yum repositories: 

      # yum-config-manager --disable <repo_id>
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      Alternatively, disable all repositories: 

      # yum-config-manager --disable \*
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      Note that this might take a few minutes if you have a large number of available repositories

  6. Enable only the repositories required by OpenShift Container Platform 4.5: 

    # subscription-manager repos \
    --enable="rhel-7-server-rpms" \
    --enable="rhel-7-server-extras-rpms" \
    --enable="rhel-7-server-ose-4.5-rpms"
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  7. Stop and disable firewalld on the host: 

    # systemctl disable --now firewalld.service
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    注意

    You must not enable firewalld later. If you do, you cannot access OpenShift Container Platform logs on the worker.

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