Troubleshooting Memory Leak Issue on Rancher 2.7.2+

To resolve the memory leak problem, it is recommended to upgrade to Rancher 2.7.5, which contains a fix for this issue. If this is not possible, please proceed with the steps below as a workaround. 

Step 1: Check Environment Variables

1.1. For the local cluster:

• Verify if the environment variable CATTLE_REQUEST_CACHE_DISABLED is set to true in the Rancher deployment of the local cluster.

1.2. For downstream clusters with high memory usage:

• Check the cattle-cluster-agent deployment of any downstream clusters experiencing high memory usage.
• Confirm if the environment variable CATTLE_REQUEST_CACHE_DISABLED is set to true in the cattle-cluster-agent deployment.

Step 2: Set Memory Limits on Deployments (if necessary). If the memory leak issue persists after adjusting the environment variables, you can try setting memory limits on the deployments as an additional measure. Here's how to do it:

2.1. For the local cluster:

• Access the Rancher deployment of the local cluster.
• Set the memory limit for the Rancher deployment to 2Gi.

2.2. For downstream clusters with high memory usage:

• Access the cattle-cluster-agent deployment of the affected downstream clusters.
• Set the appropriate memory limit to 2Gi.

By following these steps, including checking and adjusting the environment variables, setting memory limits if necessary, and upgrading to Rancher 2.7.5, you can effectively address the memory leak issue in Rancher 2.7.2 - 2.7.4 deployments.