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Chapter 12. Collecting logging data for Red Hat Support
When opening a support case, it is helpful to provide debugging information about your cluster to Red Hat Support.
The must-gather tool enables you to collect diagnostic information for project-level resources, cluster-level resources, and each of the cluster logging components.
For prompt support, supply diagnostic information for both OpenShift Container Platform and cluster logging.
Do not use the hack/logging-dump.sh script. The script is no longer supported and does not collect data.
12.1. About the must-gather tool
The oc adm must-gather CLI command collects the information from your cluster that is most likely needed for debugging issues.
For your cluster logging environment, must-gather collects the following information:
- project-level resources, including pods, configuration maps, service accounts, roles, role bindings, and events at the project level
- cluster-level resources, including nodes, roles, and role bindings at the cluster level
-
cluster logging resources in the
openshift-loggingandopenshift-operators-redhatnamespaces, including health status for the log collector, the log store, the curator, and the log visualizer
When you run oc adm must-gather, a new pod is created on the cluster. The data is collected on that pod and saved in a new directory that starts with must-gather.local. This directory is created in the current working directory.
12.2. Prerequisites
- Cluster logging and Elasticsearch must be installed.
12.3. Collecting cluster logging data
You can use the oc adm must-gather CLI command to collect information about your cluster logging environment.
Procedure
To collect cluster logging information with must-gather:
-
Navigate to the directory where you want to store the
must-gatherinformation. Run the
oc adm must-gathercommand against the cluster logging image:$ oc adm must-gather --image=$(oc -n openshift-logging get deployment.apps/cluster-logging-operator -o jsonpath='{.spec.template.spec.containers[?(@.name == "cluster-logging-operator")].image}')The
must-gathertool creates a new directory that starts withmust-gather.localwithin the current directory. For example:must-gather.local.4157245944708210408.Create a compressed file from the
must-gatherdirectory that was just created. For example, on a computer that uses a Linux operating system, run the following command:$ tar -cvaf must-gather.tar.gz must-gather.local.4157245944708210408
- Attach the compressed file to your support case on the Red Hat Customer Portal.
