9/4/2023 0 Comments Controlplane app vsIf issues arise they will probably only affect a small portion of your applications, initially, and, if that does happen, it should be much easier to rollback only a part of your application for use with the original control plane. This canary upgrade model is much safer than the in-place upgrade workflow, mainly because it can be done gradually, at your own pace. When migration is fully finished, uninstall the Istio 1.6 control plane.Migrate the data plane gradually to the new control plane.Deploy an Istio 1.7 control plane next to the Istio 1.6 control plane.Here are the high level steps necessary to accomplish this through the new canary upgrade flow: Let us suppose that we have an Istio 1.6 control plane running in our cluster and we would like to upgrade to an Istio 1.7 control plane. With these changes (and more) it finally became possible to implement a safer, canary-like control plane upgrade flow. This was mainly because the Istio control plane had to go through some dramatic simplifications before it was possible to implement a safer upgrade flow.Ī couple of the bigger architectural changes that were necessary in order to reach the new upgrade model were the simplification of the control plane to a single istio service and the addition of Istio telemetry V2 (Mixerless). Still, in-place upgrades have been the preferred method of upgrading the Istio mesh so far. If not handled with great care, or if the mesh configuration was not prepared for new (sometimes breaking) changes of Istio, then the process might easily lead to traffic disruptions. The main problem with this solution was that the whole upgrade process was essentially a single step. While this provided a much better upgrade experience than was previously available, there were still issues. To enhance that, we added automated in-place control plane upgrades to our Istio operator. This was at a time when we built and opensourced the Banzai Cloud Istio operator to help overcome some of these issues.īack then, upgrading the Istio control plane was more complicated, as well as a fully manual process. In the early days of Istio, even its deployment and management was no straightforward task, and was originally managed by Helm. Lastly, we’ll demonstrate how the Istio canary upgrade workflow is assisted by Banzai Cloud’s Istio distribution, Backyards (now Cisco Service Mesh Manager). In this post, we’ll first detail how the Istio canary control plane upgrade procedure works, in theory, and then demonstrate how the process works with a practical example, using the open source Banzai Cloud Istio operator. It allows us to upgrade the control plane with much more confidence and with a greatly reduced risk of traffic disruptions. This is why the new Istio control plane canary upgrade feature is such a game changer. Upgrading an Istio control plane in a production environment with as little downtime as possible has been one of the many challenges that service mesh operators have routinely faced. The last few versions of Istio have been released at a rate of about one every three months.īecause of this rapid rate the upgrade of an Istio service mesh is an essential and recurring task to do when using Istio.
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