How to configure Golang log level in Debian system

To configure the log level of the Golang application on the Debian system, you need to follow the following steps:

1. Select a log library: First, select the appropriate log library. The Go standard library's log packages are simple to use, while third-party libraries such as logrus and zap provide more powerful features and performance.

2. Set log level: Set the corresponding log level according to the selected log library. The settings of different libraries vary.

Use the standard library log

The Go standard library's log package itself does not directly support the log level, but can be simulated by custom output formats. The following example demonstrates how to control output based on preset levels:

 package main

import (
    "log"
    "os"
    "time"
)

func main() {
    log.SetOutput(os.Stdout)
    logLevel := "INFO" // Can be modified to "DEBUG" or "ERROR"

    prefix := "[" time.Now().Format(time.RFC3339) "] "
    log.SetPrefix(prefix)

    switch logLevel {
    case "DEBUG":
        log.SetFlags(log.LstdFlags | log.Lshortfile)
    case "INFO", "ERROR":
        log.SetFlags(log.LstdFlags)
    }

    log.Println("This is an info message")
    log.Println("This is a debug message") // Decide whether to output based on logLevel}

Use third-party library logrus

logrus is a popular log library that supports multiple log levels.

1. Installation: go get github.com/sirupsen/logrus

2. Configuration:

 package main

import (
    "os"
    "github.com/sirupsen/logrus"
)

func main() {
    logger := logrus.New()
    logger.SetLevel(logrus.InfoLevel) // Can be modified to DebugLevel, ErrorLevel, etc. logger.SetFormatter(&logrus.JSONFormatter{})
    logger.SetOutput(os.Stdout)

    logger.Info("This is an info message")
    logger.Debug("This is a debug message") // Decide whether to output based on SetLevel}

Using third-party library zap

zap is another high-performance log library.

1. Installation: go get go.uber.org/zap

2. Configuration:

 package main

import (
    "go.uber.org/zap"
    "go.uber.org/zap/zapcore"
)

func main() {
    logger, err := zap.NewProduction()
    if err != nil {
        panic(err)
    }
    defer logger.Sync()

    logger = logger.WithOptions(zap.LevelEnforcer(zapcore.InfoLevel)) // The log level can be modified logger.Info("This is an info message")
    logger.Debug("This is a debug message") // Decide whether to output based on LevelEnforcer}

Selecting the appropriate log library and referring to its documentation for detailed configuration can effectively manage and control the log output of Golang applied on the Debian system. Remember to choose the right log level according to your needs.

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