stern
diff --git a/‎README.md
Lines changed: 8 additions & 0 deletions b/‎README.md
Lines changed: 8 additions & 0 deletions
diff --git a/‎cmd/cmd.go
Lines changed: 23 additions & 0 deletions b/‎cmd/cmd.go
Lines changed: 23 additions & 0 deletions
diff --git a/‎go.mod
Lines changed: 1 addition & 1 deletion b/‎go.mod
Lines changed: 1 addition & 1 deletion
@@ -95,6 +95,7 @@ Supported Kubernetes resources are `pod`, `replicationcontroller`, `service`, `d
  `--template`                |           | Template to use for log lines, leave empty to use --output flag.
  `--timestamps`, `-t`        | `false`   | Print timestamps.
  `--timezone`                | `Local`   | Set timestamps to specific timezone.
+ `--verbosity`               | `0`       | Number of the log level verbosity
  `--version`, `-v`           | `false`   | Print the version and exit.
 <!-- auto generated cli flags end --->
 
@@ -138,6 +139,13 @@ functions](https://golang.org/pkg/text/template/#hdr-Functions)):
 | `extjson`   | `string`              | Parse the object as json and output colorized json              |
 | `ppextjson` | `string`              | Parse the object as json and output pretty-print colorized json |
 
+### Log level verbosity
+
+You can configure the log level verbosity by the `--verbose` flag.
+It is useful when you want to know how stern interacts with a Kubernetes API server in troubleshooting.
+
+Increasing the verbosity increases the number of logs. `--verbose 6` would be a good starting point.
+
 ## Examples:
 
 Tail the `gateway` container running inside of the `envvars` pod on staging
 
@@ -17,12 +17,16 @@ package cmd
 import (
 	"context"
 	"encoding/json"
+	goflag "flag"
 	"fmt"
 	"regexp"
+	"strconv"
 	"strings"
 	"text/template"
 	"time"
 
+	"k8s.io/klog/v2"
+
 	"github.com/fatih/color"
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
@@ -63,6 +67,7 @@ type options struct {
 	podQuery            string
 	noFollow            bool
 	resource            string
+	verbosity           int
 }
 
 func NewOptions(streams genericclioptions.IOStreams) *options {
@@ -109,6 +114,10 @@ func (o *options) Validate() error {
 }
 
 func (o *options) Run(cmd *cobra.Command) error {
+	if err := o.setVerbosity(); err != nil {
+		return err
+	}
+
 	config, err := o.sternConfig()
 	if err != nil {
 		return err
@@ -328,6 +337,19 @@ func (o *options) sternConfig() (*stern.Config, error) {
 	}, nil
 }
 
+// setVerbosity sets the log level verbosity
+func (o *options) setVerbosity() error {
+	if o.verbosity != 0 {
+		// klog does not have an external method to set verbosity,
+		// so we need to set it by a flag.
+		// See https://github.com/kubernetes/klog/issues/336 for details
+		var fs goflag.FlagSet
+		klog.InitFlags(&fs)
+		return fs.Set("v", strconv.Itoa(o.verbosity))
+	}
+	return nil
+}
+
 // AddFlags adds all the flags used by stern.
 func (o *options) AddFlags(fs *pflag.FlagSet) {
 	fs.BoolVarP(&o.allNamespaces, "all-namespaces", "A", o.allNamespaces, "If present, tail across all namespaces. A specific namespace is ignored even if specified with --namespace.")
@@ -356,6 +378,7 @@ func (o *options) AddFlags(fs *pflag.FlagSet) {
 	fs.StringVar(&o.template, "template", o.template, "Template to use for log lines, leave empty to use --output flag.")
 	fs.BoolVarP(&o.timestamps, "timestamps", "t", o.timestamps, "Print timestamps.")
 	fs.StringVar(&o.timezone, "timezone", o.timezone, "Set timestamps to specific timezone.")
+	fs.IntVar(&o.verbosity, "verbosity", o.verbosity, "Number of the log level verbosity")
 	fs.BoolVarP(&o.version, "version", "v", o.version, "Print the version and exit.")
 }
 
 
@@ -13,6 +13,7 @@ require (
 	k8s.io/apimachinery v0.26.0
 	k8s.io/cli-runtime v0.26.0
 	k8s.io/client-go v0.26.0
+	k8s.io/klog/v2 v2.80.1
 )
 
 require (
@@ -61,7 +62,6 @@ require (
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	k8s.io/klog/v2 v2.80.1 // indirect
 	k8s.io/kube-openapi v0.0.0-20230109183929-3758b55a6596 // indirect
 	k8s.io/utils v0.0.0-20221128185143-99ec85e7a448 // indirect
 	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect