[misc] Support configurable max log size with var NB_LOG_MAX_SIZE_MB (#…

…2592)

* Support configurable max log size with var NB_LOG_MAX_SIZE_MB

* add better logs

util/log.go

@@ -5,27 +5,31 @@ import (
  "os"
  "path/filepath"
  "slices"
+ "strconv"
 
  log "github.com/sirupsen/logrus"
  "gopkg.in/natefinch/lumberjack.v2"
 
  "github.com/netbirdio/netbird/formatter"
 )
 
+const defaultLogSize = 5
+
 // InitLog parses and sets log-level input
 func InitLog(logLevel string, logPath string) error {
  level, err := log.ParseLevel(logLevel)
  if err != nil {
  log.Errorf("Failed parsing log-level %s: %s", logLevel, err)
  return err
  }
- customOutputs := []string{"console", "syslog"};
+ customOutputs := []string{"console", "syslog"}
 
  if logPath != "" && !slices.Contains(customOutputs, logPath) {
+ maxLogSize := getLogMaxSize()
  lumberjackLogger := &lumberjack.Logger{
  // Log file absolute path, os agnostic
  Filename: filepath.ToSlash(logPath),
- MaxSize: 5, // MB
+ MaxSize: maxLogSize, // MB
  MaxBackups: 10,
  MaxAge: 30, // days
  Compress: true,
@@ -46,3 +50,18 @@ func InitLog(logLevel string, logPath string) error {
  log.SetLevel(level)
  return nil
 }
+
+func getLogMaxSize() int {
+ if sizeVar, ok := os.LookupEnv("NB_LOG_MAX_SIZE_MB"); ok {
+ size, err := strconv.ParseInt(sizeVar, 10, 64)
+ if err != nil {
+ log.Errorf("Failed parsing log-size %s: %s. Should be just an integer", sizeVar, err)
+ return defaultLogSize
+ }
+
+ log.Infof("Setting log file max size to %d MB", size)
+
+ return int(size)
+ }
+ return defaultLogSize
+}