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Getting Started

A demo application that reconfigures logback logger at runtime without restart leveraging k8s config map and logback 'scan' property.

Run demo

java17, mvn, kind, kubectl must be installed and present in your path. Docker daemon must be running.

mvn spring-boot:build-image
kind create cluster
kind load docker-image log-level-demo:0.0.1-SNAPSHOT
kubectl apply -f k8s/config-map.yaml -f k8s/deployment.yaml

Checks logs of pods:

kubectl get logs demo-deployment-0
kubectl get logs demo-deployment-1

Only 'info' message should be logged:

11:59:00.403 [scheduling-1] INFO  o.dmitry.example.logleveldemo.Task - Logger level is >= info
11:59:01.401 [scheduling-1] INFO  o.dmitry.example.logleveldemo.Task - Logger level is >= info
11:59:02.402 [scheduling-1] INFO  o.dmitry.example.logleveldemo.Task - Logger level is >= info

Modify k8s/config-map.yaml file and set APPLICATION_LOG_LEVEL variable to debug. Apply config map again:

kubectl apply -f k8s/config-map.yaml

Wait for few minutes, debug messages should also appear in the logs:

12:01:42,671 |-INFO in ch.qos.logback.core.joran.util.ConfigurationWatchListUtil@4b553d26 - Adding [file:/config/log-levels.xml] to configuration watch list.
12:01:42,674 |-INFO in ch.qos.logback.classic.model.processor.ConfigurationModelHandler - Registering a new ReconfigureOnChangeTask ReconfigureOnChangeTask(born:1668427302674)
12:01:42,675 |-INFO in ch.qos.logback.classic.model.processor.ConfigurationModelHandler - Will scan for changes in [file:/workspace/BOOT-INF/classes/logback.xml] 
12:01:42,675 |-INFO in ch.qos.logback.classic.model.processor.ConfigurationModelHandler - Setting ReconfigureOnChangeTask scanning period to 1 seconds
12:01:42,675 |-INFO in ch.qos.logback.core.model.processor.AppenderModelHandler - Processing appender named [STDOUT]
12:01:42,675 |-INFO in ch.qos.logback.core.model.processor.AppenderModelHandler - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
12:01:42,676 |-INFO in ch.qos.logback.core.model.processor.ImplicitModelHandler - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property
12:01:42,678 |-INFO in ch.qos.logback.classic.model.processor.RootLoggerModelHandler - Setting level of ROOT logger to INFO
12:01:42,678 |-INFO in ch.qos.logback.core.model.processor.AppenderRefModelHandler - Attaching appender named [STDOUT] to Logger[ROOT]
12:01:42,678 |-INFO in ch.qos.logback.classic.model.processor.LoggerModelHandler - Setting level of logger [org.dmitry.example] to DEBUG
12:01:42,678 |-INFO in ch.qos.logback.core.model.processor.DefaultProcessor@11f9422b - End of configuration.
12:01:42,678 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@1f3ebe64 - Registering current configuration as safe fallback point
12:01:43.495 [scheduling-1] INFO  o.dmitry.example.logleveldemo.Task - Logger level is >= info
12:01:43.495 [scheduling-1] DEBUG o.dmitry.example.logleveldemo.Task - Logger level is >= debug
12:01:44.495 [scheduling-1] INFO  o.dmitry.example.logleveldemo.Task - Logger level is >= info
12:01:44.496 [scheduling-1] DEBUG o.dmitry.example.logleveldemo.Task - Logger level is >= debug
12:01:45.496 [scheduling-1] INFO  o.dmitry.example.logleveldemo.Task - Logger level is >= info
12:01:45.496 [scheduling-1] DEBUG o.dmitry.example.logleveldemo.Task - Logger level is >= debug
12:01:46.497 [scheduling-1] INFO  o.dmitry.example.logleveldemo.Task - Logger level is >= info
12:01:46.497 [scheduling-1] DEBUG o.dmitry.example.logleveldemo.Task - Logger level is >= debug

Reference Documentation

For further reference, please consider the following sections: