This guide explains how to stream logs in real time using the kubectl logs command for monitoring application behavior and debugging issues.
In this guide, we explain how to stream logs in real time using the kubectl logs command. Monitoring real-time logs is crucial for tracking application behavior, debugging issues, and understanding event flow.When you execute the logs command without any flags:
kubectl logs
it will display the log entries available up to the moment the command is executed. This behavior might prompt you to run the command repeatedly to capture the latest logs. For instance, here is an excerpt of log entries captured before applying the follow functionality:
I0419 16:16:59.419977 55 logs_generator.go:671] 599 PUT /api/v1/namespaces/kube-system/pods/kcx 280I0419 16:17:00.619992 55 logs_generator.go:671] 600 POST /api/v1/namespaces/default/pods/swbq 515I0419 16:17:01.819993 55 logs_generator.go:671] 601 PUT /api/v1/namespaces/default/pods/b59 558I0419 16:17:02.819983 55 logs_generator.go:671] 602 GET /api/v1/namespaces/default/pods/j71 472I0419 16:17:03.019821 55 logs_generator.go:671] 603 PUT /api/v1/namespaces/default/pods/3545 409I0419 16:17:04.219986 55 logs_generator.go:671] 604 GET /api/v1/namespaces/default/pods/j74 507I0419 16:17:05.419986 55 logs_generator.go:671] 605 GET /api/v1/namespaces/default/pods/3687 528I0419 16:17:06.619986 55 logs_generator.go:671] 606 GET /api/v1/namespaces/kube-system/pods/5ns 368I0419 16:17:07.819936 55 logs_generator.go:671] 607 POST /api/v1/namespaces/default/pods/tfwq 252I0419 16:17:08.019973 55 logs_generator.go:671] 608 GET /api/v1/namespaces/ns/pods/354 467I0419 16:17:09.619983 55 logs_generator.go:671] 609 PUT /api/v1/namespaces/default/pods/8t75 482I0419 16:17:10.819981 55 logs_generator.go:671] 610 GET /api/v1/namespaces/default/pods/92p 286I0419 16:17:11.819936 55 logs_generator.go:671] 611 GET /api/v1/namespaces/ns/pods/pck 219I0419 16:17:12.819993 55 logs_generator.go:671] 612 PUT /api/v1/namespaces/default/pods/hdb 219I0419 16:17:13.819980 55 logs_generator.go:671] 613 POST /api/v1/namespaces/default/pods/ckx 410I0419 16:17:14.219988 55 logs_generator.go:671] 614 POST /api/v1/namespaces/default/pods/ckx 410I0419 16:17:15.619974 55 logs_generator.go:671] 615 GET /api/v1/namespaces/default/pods/2fg 556I0419 16:17:16.819975 55 logs_generator.go:671] 616 GET /api/v1/namespaces/default/pods/lmg7 392I0419 16:17:17.019942 55 logs_generator.go:671] 617 PUT /api/v1/namespaces/kube-system/pods/hnf 441I0419 16:17:17.219992 55 logs_generator.go:671] 618 GET /api/v1/namespaces/ns/pods/dx55 434I0419 16:17:18.619964 55 logs_generator.go:671] 619 GET /api/v1/namespaces/default/pods/gm94 583I0419 16:17:19.219988 55 logs_generator.go:671] 620 GET /api/v1/namespaces/default/pods/gm94 583I0419 16:17:20.619962 55 logs_generator.go:671] 621 PUT /api/v1/namespaces/kube-system/pods/mnf 405I0419 16:17:21.619979 55 logs_generator.go:671] 622 PUT /api/v1/namespaces/kube-system/pods/svis 224I0419 16:17:22.619973 55 logs_generator.go:671] 623 GET /api/v1/namespaces/ns/pods/wm
Without the follow flag, the kubectl logs command only retrieves the log entries that exist at that particular moment.
To enable real-time streaming of log entries, use the -f (or —follow) flag:
kubectl logs --follow
This command continuously streams logs as new entries are generated, making it especially useful during live debugging, testing, or monitoring specific events.For a quick overview, refer to the table below:
Command
Description
Example
Default Logs
Displays existing log entries at execution time
kubectl logs
Follow Logs
Streams new log entries in real time
kubectl logs --follow
Using the —follow flag allows your command terminal to update automatically with new log entries, providing you with an efficient tool to monitor your Kubernetes environment as it changes.This concludes our discussion on streaming logs with kubectl. For more detailed information and further resources, check out the Kubernetes Documentation.Happy logging!
