pod-logs

Pod logs retrieval example

This example features YAKC's capabilities to retrieve logs from a Pod.

The example showcases the follow flag when retrieving the logs. The main class accepts anr agument --follow that will enable the flag when retrieving the logs.

If the follow flag is enabled, logs will be followed in a separate thread for a couple of seconds, the Pod container image run command is configured to echo some message every few milliseconds. The console will be populated by these messages until the Thread is interrupted.

If the follow flag is not enabled, logs will be retrieved for current execution status of the Pod and execution will finish.

How to run

In order to run the example you need an active K8s cluster (e.g. Minikube).

No follow

In the project quick start directory, run mvn clean package -q:

$ mvn clean package -q
Waiting for POD yakc-quickstart-pod-logs to be created
Waiting for POD yakc-quickstart-pod-logs to log messages
POD yakc-quickstart-pod-logs was created
2020-04-26T15:56:35.604572177Z Logging message 1
2020-04-26T15:56:35.706897333Z Logging message 2
2020-04-26T15:56:35.80769418Z Logging message 3
2020-04-26T15:56:35.91083855Z Logging message 4
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2020-04-26T15:56:36.425483954Z Logging message 9
2020-04-26T15:56:36.526270188Z Logging message 10

Cleaning up

Follow logs

In the project quick start directory, run mvn clean package -q -Dexec.args=follow:

$ mvn clean package -q -q -Dexec.args=follow
Waiting for POD yakc-quickstart-pod-logs to be created
Waiting for POD yakc-quickstart-pod-logs to log messages
POD yakc-quickstart-pod-logs was created
Log reading started in a parallel thread, following logs for a couple of seconds
2020-04-26T15:57:16.203981033Z Logging message 1
2020-04-26T15:57:16.30628361Z Logging message 2
2020-04-26T15:57:16.408269187Z Logging message 3
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2020-04-26T15:57:26.395199983Z No more messages!
Log thread finished
Cleaning up