Update logging configuration to use environment variable LOG_LEVEL

Author: chenzhiguo

deploy/joylive-injector/templates/deployment.yaml

@@ -26,7 +26,7 @@ spec:
                 topologyKey: "kubernetes.io/hostname"
       containers:
         - env:
-            - name: log.level
+            - name: LOG_LEVEL
               value: {{ .Values.logLevel }}
             - name: JOYLIVE_CONFIGMAP_NAME
               value: {{ .Values.configMapName }}

pkg/log/log.go

@@ -32,6 +32,11 @@ type Logger struct {
 
 // InitLog log instance init
 func InitLog() {
+	viper.AutomaticEnv()
+	err := viper.BindEnv("log.level", "LOG_LEVEL")
+	if err != nil {
+		return
+	}
 	viper.SetDefault("log.level", "info")
 	level := viper.GetString("log.level")
 	logLevel := InfoLevel