# Troubleshoot

Diagnose and resolve issues with ScyllaDB Operator, ScyllaDB clusters, and related infrastructure.

## By symptom

| Symptom                                                          | Guide                                                                                                                                                                                               |
|------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Pods restarting unexpectedly                                     | [Investigate pod restarts](https://operator.docs.scylladb.com/v1.22/troubleshoot/investigate-restarts.md)                                                                                           |
| Application cannot connect to ScyllaDB                           | [Connect Your App](https://operator.docs.scylladb.com/v1.22/connect-your-app/index.md) and [Set up networking](https://operator.docs.scylladb.com/v1.22/deploy-scylladb/set-up-networking/index.md) |
| Upgrade failed or stuck                                          | [Upgrade](https://operator.docs.scylladb.com/v1.22/upgrade/index.md)                                                                                                                                |
| Node replace stuck or failed                                     | [Recover from a failed node replace](https://operator.docs.scylladb.com/v1.22/troubleshoot/recover-from-failed-replace.md)                                                                          |
| Slow queries, throughput degradation, or CPU pinning not working | [Troubleshoot performance](https://operator.docs.scylladb.com/v1.22/troubleshoot/troubleshoot-performance.md)                                                                                       |
| Need to change log level without a rolling restart               | [Change log level](https://operator.docs.scylladb.com/v1.22/troubleshoot/change-log-level.md)                                                                                                       |
| Need to collect data for a support ticket                        | [Collect debugging information](https://operator.docs.scylladb.com/v1.22/troubleshoot/collect-debugging-information/index.md)                                                                       |
| Need to configure or collect core dumps                          | [Collect core dumps](https://operator.docs.scylladb.com/v1.22/troubleshoot/configure-coredumps.md)                                                                                                  |

* [Investigate pod restarts](https://operator.docs.scylladb.com/v1.22/troubleshoot/investigate-restarts.md)
* [Change log level on a live cluster](https://operator.docs.scylladb.com/v1.22/troubleshoot/change-log-level.md)
* [Recover from a failed node replace](https://operator.docs.scylladb.com/v1.22/troubleshoot/recover-from-failed-replace.md)
* [Troubleshoot performance](https://operator.docs.scylladb.com/v1.22/troubleshoot/troubleshoot-performance.md)
* [Collect debugging information](https://operator.docs.scylladb.com/v1.22/troubleshoot/collect-debugging-information/index.md)
* [Collect core dumps](https://operator.docs.scylladb.com/v1.22/troubleshoot/configure-coredumps.md)