Network connectivity upgrade error
Learn how to work around network connectivity issues when upgrading the product.
Problem
For Red Hat®
OpenShift® Container Platform version
4.10 and earlier, the Container Network Interface (CNI) default was OpenShiftSDN
.
However, from version 4.11 onwards, Red Hat
OpenShift Container Platform uses the
OVNKubernetes
network plugin by default, for new installations. When you upgrade
Netcool® Operations Insight® on OpenShift, network
connectivity issues might occur. For example, some ITNM Observers might not be
able to connect.
The Red Hat
OpenShift Networking network plugin is selected during
installation (OpenShiftSDN
or OVNKubernetes
). This value cannot be
changed after cluster installation. From Red Hat
OpenShift Container Platform version 4.12 onwards, the
OVNKubernetes
Container Network Interface (CNI) uses the
100.64.0.0/16
IPv4 subnet internally. For more information, see Cluster Network Operator and About the OVN-Kubernetes network plugin
in the Red Hat
OpenShift Container Platform documentation.
Solution
Redeploy your cluster with OpenShiftSDN
or redeploy the cluster with
OVNKubernetes
and customize the address range that it uses internally.
If your existing network infrastructure overlaps with the 100.64.0.0/16
IPv4
subnet, you can specify a different IP address range for internal use by
OVNKubernetes
. You must ensure that the IP address range does not overlap with any
other subnet used by your Red Hat
OpenShift Container Platform installation. The IP
address range must be larger than the maximum number of nodes that can be added to the
cluster..