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2020-05-06 - OS upgrade from RH/OL 7.5 - Issues and Mandatory Steps

  • Updated
  • Products: FlashGrid Cluster on Azure
  • Products: FlashGrid Cluster on GCP
  • Products: FlashGrid Storage Fabric
  • Products: FlashGrid Cluster on AWS

Summary

Upgrading the operating system from Red Hat Enterprise Linux 7.5 / Oracle Linux 7.5 to a newer version may affect the startup of Grid Infrastructure/CRS components after reboot

Affected products

  • FlashGrid cluster
  • On-prem clusters with FlashGrid Cloud Area Network (CLAN) used

Affected versions

OS versions: RHEL 7.5 / Oracle Linux 7.5 or older

Resolution

  • this procedure must be applied before upgrading OS and/or installing NetworkManager rpm package on any cluster node
  • must be applied on all cluster nodes (database and quorum)
  • create the following file (if it does not exist) - /etc/NetworkManager/NetworkManager.conf and add these lines:
[keyfile]
unmanaged-devices=interface-name:fg-*,interface-name:ifb-*,interface-name:eth1
[main]
dns=none
  • in case of on-prem CLAN deployment, modify list of unmanaged devices to include all CLAN NICs
  • prevent the file from being modified adding an immutable attribute:
chattr +i /etc/NetworkManager/NetworkManager.conf

Additional references

The OS update procedure must follow the recommended steps described in the knowledge base article: Updating OS.