Chapter 2. OpenShift Data Foundation upgrade channels and releases
In OpenShift Container Platform 4.1, Red Hat introduced the concept of channels for recommending the appropriate release versions for cluster upgrades. By controlling the pace of upgrades, these upgrade channels allow you to choose an upgrade strategy. As OpenShift Data Foundation gets deployed as an operator in OpenShift Container Platform, it follows the same strategy to control the pace of upgrades by shipping the fixes in multiple channels. Upgrade channels are tied to a minor version of OpenShift Data Foundation.
For example, OpenShift Data Foundation 4.9 upgrade channels recommend upgrades within 4.9. They do not recommend upgrades to 4.10 or later releases. This strategy ensures that administrators can explicitly decide to upgrade to the next minor version of OpenShift Data Foundation.
Upgrade channels control only release selection and do not impact the version of the cluster that you install; the
odf-operator decides the version of OpenShift Data Foundation to be installed. Out of the box, it always installs the latest OpenShift Data Foundation release maintaining the compatibility with OpenShift Container Platform. So on OpenShift Container Platform 4.9, OpenShift Data Foundation 4.9 will be the latest version which can be installed.
OpenShift Data Foundation upgrades are tied to the OpenShift Container Platform upgrade to ensure that compatibility and interoperability are maintained with the OpenShift Container Platform. For OpenShift Data Foundation 4.9, OpenShift Container Platform 4.9 and 4.10 (when generally available) are supported. OpenShift Container Platform 4.10 is supported to maintain forward compatibility with OpenShift Container Platform. Keep the OpenShift Data Foundation version the same as OpenShift Container Platform in order to get the benefit of all the features and enhancements in that release.
OpenShift Data Foundation 4.9 offers the following upgrade channel:
- eus-4.y (only when running an even-numbered 4.y cluster release, like 4.10)
Once a new version is Generally Available, the stable channel corresponding to the minor version gets updated with the new image which can be used to upgrade. You can use the stable-4.9 channel to upgrade from OpenShift Container Storage 4.8 and upgrades within 4.9.
In addition to the stable channel, all even-numbered minor versions of OpenShift Data Foundation offer Extended Update Support (EUS). These EUS versions extend the Full and Maintenance support phases for customers with Standard and Premium Subscriptions to 18 months. The only difference between stable-4.y and eus-4.y channels is that the EUS channels will include the release only when the next EUS release is available.