OpenShift Troubleshooting
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Overview
The general technique is to increase the logging level of various OpenShift master (api, controllers) and node processes as described here:
--loglevel=10 seems to work fine.
Then tail the journalctl log. More details on getting logging information:
General Troubleshooting
Troubleshooting OpenShift Container Platform: Basics:
Master/Node Processes Troubleshooting
- OpenShift Runtime
Metrics Troubleshooting
oadm diagnostics MetricsApiProxy
Troubleshooting Pods
oc -n <project-name> get pods
oc -n <project-name> describe po/<pod-name> ... Name: logging-fluentd-3kz30 ... Node: node2/ ... Status: Failed Reason: MatchNodeSelector Message: Pod Predicate MatchNodeSelector failed
In-line pod logs:
oc logs -f <pod-name>
Connect to a pod:
oc rsh <pod-name>
Connect to a Pod as Root
Log into the physical node running the pod. The pod - node association can be inferred executing
oc describe <pod-name>
and extracting the "Node:" value.
On the node, run
docker ps
and identify the container ID.
Then
docker exec -u 0 -it 3152a2509d92 /bin/bash
For more details on docker exec, see:
As root, various diagnostic utilities can be temporarily installed:
yum install bind-utils
Copy Files into Pods
For more details on oc cp:
Troubleshooting Routes
Troubleshooting Logging
oadm diagnostics AggregatedLogging