Nodes IP getting changed after upgrading from OCP-4.5 to 4.6 for baremetal cluster for nodes with more than one NIC.

Solution In Progress - Updated -

Issue

  • After upgrading the cluster from 4.5.15+ to 4.6.z the nodes kubelet IP changed for a node with multiple NIC.
  • Due to the change of Kubelets IP the network communication impacted which results in operators going into a degraded state.
- Before the upgrade 
    +--------+-----+
    | Node   | NIC1| <--- This NIC is being used for OCP ext communication. (kubelet IP)
    |        +-----+
    |        | NIC2| <--- This NIC is being used for OCP internal communication
    |        +-----+
    |              |
    +--------------+

- After the upgrade 

    +--------+-----+
    | Node   | NIC1| <--- This NIC is being used for OCP ext communication. 
    |        +-----+
    |        | NIC2| <--- This NIC is being used for OCP internal communication. (kubelet IP)
    |        +-----+
    |              |
    +--------------+

Environment

  • Red Hat OpenShift Container Platform Baremetal cluster.
    • 4.5
    • 4.6

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