OpenShift Container Platform provides strict backwards compatibility guarantees for all supported APIs, excluding alpha APIs (which may be changed without notice) and beta APIs (which may occasionally be changed in a non-backwards compatible manner).
Red Hat did not publicly release OpenShift Container Platform 4.0 and, instead, released OpenShift Container Platform 4.1 directly after version 3.11.
The OpenShift Container Platform version must match between master and node hosts, excluding
temporary mismatches during cluster upgrades. For example, in a
4.2 cluster, all masters must be 4.2 and all nodes
must be 4.2. If you installed an earlier version of
cannot use it to complete all of the commands in OpenShift Container Platform
4.2. You must download and install the new version of
Changes of APIs for non-security related reasons will involve, at minimum, two
minor releases (3.11 to 4.1 to 4.2, for example) to allow older
oc to update.
Using new capabilities may require newer
oc. A 4.2 server may have additional
capabilities that a 4.1
oc cannot use and a 4.2
oc may have additional
capabilities that are not supported by a 4.1 server.
X.Y+N  (
X.Y+N  (Server)
oc client may not be able to access server features.
oc client may provide options and features that may not be compatible with the accessed server.