Can I Dynamically Change the Log Level of a Controller-Runtime Zap Logger?

Changing Log Level of Controller-Runtime Zap Logger at Runtime

Within a Kubernetes application that utilizes the controller-runtime framework, a zap logger instance is often configured upon initialization. The default log level is determined by options passed to the zap.New function during setup.

Q: Is it feasible to modify the log level dynamically after initialization?

A: Yes, it is possible to update the log level dynamically using the AtomicLevel feature provided by the zap library.

Implementation:

To achieve this, utilize the following steps:

1. Create an instance of zap.AtomicLevel.
2. Configure the zap logger using the desired options, including the AtomicLevel instance.
3. To modify the log level at runtime, simply call the SetLevel method on the AtomicLevel instance.

Note: The logger must be configured using the built-in zap logging functions and not the zapcore.NewCore function to maintain compatibility with the ctrl.SetLogger interface from controller-runtime.

Example Code:

import (
    "go.uber.org/zap/zapcore"
    "sigs.k8s.io/controller-runtime/pkg/log/zap"
)

var (
    atomLevel = zap.NewAtomicLevel()
    logger    = zap.New(zapcore.NewCore(zapcore.NewConsoleEncoder(zap.DefaultEncodeConfig), zapcore.Lock(os.Stdout), atomLevel))
)

func main() {
    // Set initial log level to Debug
    atomLevel.SetLevel(zap.DebugLevel)
    logger.Info("Initial log level set to Debug")

    // Change log level to Error
    atomLevel.SetLevel(zap.ErrorLevel)
    logger.Info("Log level changed to Error")
}

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