Not able to see the logs in Custom Location in Kubernetes - docker

Question

I am using zap as the logger. I am storing the log in the custom location: /var/tmp/audit.log
Unfortunately, when I try to look at the logs in Kubernetes I am not able to find those logs. Can anyone suggest what I am missing? Do I have to volume mount the logs? I can find the logs if I do ssh into the Kubernetes pods but I can't find it when I do kubectl logs pod name
import (
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"gopkg.in/natefinch/lumberjack.v2"
"io"
)
var (
Logger *zap.Logger
AuditLogging *zap.Logger
)
type WriteSyncer struct {
io.Writer
}
func (ws WriteSyncer) Sync() error {
return nil
}
func InitLogging(mode string) {
var cfg zap.Config
var logName = "/var/tmp/abc.log"
var slogName = "/var/tmp/audit.log"
if mode == "production" {
cfg = zap.NewProductionConfig()
cfg.DisableCaller = true
} else {
cfg = zap.NewDevelopmentConfig()
cfg.EncoderConfig.LevelKey = "level"
cfg.EncoderConfig.NameKey = "name"
cfg.EncoderConfig.MessageKey = "msg"
cfg.EncoderConfig.CallerKey = "caller"
cfg.EncoderConfig.StacktraceKey = "stacktrace"
}
cfg.Encoding = "json"
cfg.EncoderConfig.TimeKey = "timestamp"
cfg.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
cfg.OutputPaths = []string{logName}
sw := getWriteSyncer(logName)
swSugar := getWriteSyncer(slogName)
l, err := cfg.Build(SetOutput(sw, cfg))
if err != nil {
panic(err)
}
defer l.Sync()
ls, err := cfg.Build(SetOutput(swSugar, cfg))
if err != nil {
panic(err)
}
defer ls.Sync()
Logger = l
AuditLogging = ls
}
// SetOutput replaces existing Core with new, that writes to passed WriteSyncer.
func SetOutput(ws zapcore.WriteSyncer, conf zap.Config) zap.Option {
var enc zapcore.Encoder
switch conf.Encoding {
case "json":
enc = zapcore.NewJSONEncoder(conf.EncoderConfig)
case "console":
enc = zapcore.NewConsoleEncoder(conf.EncoderConfig)
default:
panic("unknown encoding")
}
return zap.WrapCore(func(core zapcore.Core) zapcore.Core {
return zapcore.NewCore(enc, ws, conf.Level)
})
}
func getWriteSyncer(logName string) zapcore.WriteSyncer {
var ioWriter = &lumberjack.Logger{
Filename: logName,
MaxSize: 10, // MB
MaxBackups: 3, // number of backups
MaxAge: 28, //days
LocalTime: true,
Compress: false, // disabled by default
}
var sw = WriteSyncer{
ioWriter,
}
return sw
}
Here is how my yaml looks like
apiVersion: apps/v1
kind: Deployment
metadata:
annotations:
kompose.cmd: kompose convert -f docker-compose.yml
kompose.version: 1.22.0 (955b78124)
creationTimestamp: null
labels:
io.kompose.service: service
name: service
spec:
replicas: 1
selector:
matchLabels:
io.kompose.service: service
strategy: {}
template:
metadata:
annotations:
kompose.cmd: kompose convert -f docker-compose.yml
kompose.version: 1.22.0 (955b78124)
creationTimestamp: null
labels:
io.kompose.service: service
spec:
containers:
- image: services
imagePullPolicy: Never
name: service
ports:
- containerPort: 5001
- containerPort: 5002
resources: {}
volumeMounts:
- name: varlog
mountPath: /var/tmp
restartPolicy: Always
volumes:
- name: varlog
hostPath:
path: /var/tmp
status: {}
apiVersion: v1
kind: Service
metadata:
annotations:
kompose.cmd: kompose convert -f docker-compose.yml
kompose.version: 1.22.0 (955b78124)
creationTimestamp: null
labels:
io.kompose.service: service
name: service
spec:
ports:
- name: "5001"
port: 5001
targetPort: 5001
- name: "5002"
port: 5002
targetPort: 5002
selector:
io.kompose.service: service
status:
loadBalancer: {}