Resizer doesnt support log to the file using klog methods

[parth-gr]

External-resizer uses the klog for it's logging mechanism. Klog provides various methods to be used, including logging into the file by setting the flag, flag.Set("log_file", "var/a5.log").

But using the flag looks like it throughs error,

PS: Using it with ceph-csi pod container, https://github.com/rook/rook/pull/14305

[rider@localhost examples]$ kubectl logs csi-rbdplugin-provisioner-66bcf974b8-gbjxx -c csi-resizer -nrook-ceph
flag provided but not defined: -log_file
Usage of /csi-resizer:
  -csi-address string
    	Address of the CSI driver socket. (default "/run/csi/socket")
  -feature-gates value
    	A set of key=value paris that describe feature gates for alpha/experimental features for csi external resizer.Options are:
    	AllAlpha=true|false (ALPHA - default=false)
    	AllBeta=true|false (BETA - default=false)
    	AnnotateFsResize=true|false (ALPHA - default=false)
    	RecoverVolumeExpansionFailure=true|false (ALPHA - default=false)
    	VolumeAttributesClass=true|false (ALPHA - default=false)
  -handle-volume-inuse-error
    	Flag to turn on/off capability to handle volume in use error in resizer controller. Defaults to true if not set. (default true)
  -http-endpoint :8080
    	The TCP network address where the HTTP server for diagnostics, including metrics and leader election health check, will listen (example: :8080). The default is empty string, which means the server is disabled. Only one of `--metrics-address` and `--http-endpoint` can be set.
  -kube-api-burst int
    	Burst to use while communicating with the kubernetes apiserver. Defaults to 10. (default 10)
  -kube-api-qps float
    	QPS to use while communicating with the kubernetes apiserver. Defaults to 5.0. (default 5)
  -kubeconfig string
    	Absolute path to the kubeconfig
  -leader-election
    	Enable leader election.
  -leader-election-lease-duration duration
    	Duration, in seconds, that non-leader candidates will wait to force acquire leadership. Defaults to 15 seconds. (default 15s)
  -leader-election-namespace string
    	Namespace where the leader election resource lives. Defaults to the pod namespace if not set.
  -leader-election-renew-deadline duration
    	Duration, in seconds, that the acting leader will retry refreshing leadership before giving up. Defaults to 10 seconds. (default 10s)
  -leader-election-retry-period duration
    	Duration, in seconds, the LeaderElector clients should wait between tries of actions. Defaults to 5 seconds. (default 5s)
  -log-flush-frequency duration
    	Maximum number of seconds between log flushes (default 5s)
  -log-json-info-buffer-size value
    	[Alpha] In JSON format with split output streams, the info messages can be buffered for a while to increase performance. The default value of zero bytes disables buffering. The size can be specified as number of bytes (512), multiples of 1000 (1K), multiples of 1024 (2Ki), or powers of those (3M, 4G, 5Mi, 6Gi). Enable the LoggingAlphaOptions feature gate to use this.
  -log-json-split-stream
    	[Alpha] In JSON format, write error messages to stderr and info messages to stdout. The default is to write a single stream to stdout. Enable the LoggingAlphaOptions feature gate to use this.
  -logging-format string
    	Sets the log format. Permitted formats: "json" (gated by LoggingBetaOptions), "text". (default "text")
  -master string
    	Master URL to build a client config from. Either this or kubeconfig needs to be set if the provisioner is being run out of cluster.
  -metrics-address :8080
    	(deprecated) The TCP network address where the prometheus metrics endpoint will listen (example: :8080). The default is empty string, which means metrics endpoint is disabled. Only one of `--metrics-address` and `--http-endpoint` can be set.
  -metrics-path /metrics
    	The HTTP path where prometheus metrics will be exposed. Default is /metrics. (default "/metrics")
  -resync-period duration
    	Resync period for cache (default 10m0s)
  -retry-interval-max duration
    	Maximum retry interval of failed volume resize. (default 5m0s)
  -retry-interval-start duration
    	Initial retry interval of failed volume resize. It exponentially increases with each failure, up to retry-interval-max. (default 1s)
  -timeout duration
    	Timeout for waiting for CSI driver socket. (default 10s)
  -v value
    	number for the log level verbosity
  -version
    	Show version
  -vmodule value
    	comma-separated list of pattern=N settings for file-filtered logging (only works for text log format)
  -workers int
    	Concurrency to process multiple resize requests (default 10)

I suspect it is because klog.InitFlags(nil) and klog.Flush() isn't called, but there can be some other bug too at the same time