[Rancher] Can I run other, non-Rancher workloads on the same Kubernetes cluster that Rancher is installed on?

Article Number: 000020442

Resolution

While technically possible, running other workloads or microservices in the same Kubernetes cluster that Rancher is installed on invalidates the Rancher Support SLA. So it is something that is recommended against.
Any technical support that is offered for tickets stemming from this scenario shall only be on a best-effort basis.

The customers should be aware that Rancher Support Engineers might ask them to separate the workloads as part of the troubleshooting. 

Note:
Run Rancher on a Separate Cluster is also one of the top items called out in our docs page on Tips for Running Rancher.