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Parameterize config watcher loop speed #1322

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Parameterize config watcher loop speed #1322

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7 changes: 6 additions & 1 deletion cmd/thin_entrypoint/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,7 @@ type Options struct {
ForceCNIVersion bool
SkipTLSVerify bool
SkipMultusConfWatch bool
WatchTimer time.Duration
}

const (
Expand Down Expand Up @@ -93,6 +94,7 @@ func (o *Options) addFlags() {
fs.StringVar(&o.AdditionalBinDir, "additional-bin-dir", "", "adds binDir option to configuration (used only with --multus-conf-file=auto)")
fs.BoolVar(&o.SkipTLSVerify, "skip-tls-verify", false, "skip TLS verify")
fs.BoolVar(&o.ForceCNIVersion, "force-cni-version", false, "force cni version to '--cni-version' (only for e2e-kind testing)")
fs.DurationVar(&o.WatchTimer, "multus-config-watch-timer", 1*time.Second, "how long to wait before reconciling multus config")
fs.MarkHidden("force-cni-version")
fs.MarkHidden("skip-tls-verify")
}
Expand Down Expand Up @@ -618,13 +620,16 @@ func main() {
defer cleanupMultusConf(&opt)
}

watcher := time.NewTicker(opt.WatchTimer)
defer watcher.Stop()

watchChanges := opt.CleanupConfigOnExit && opt.MultusConfFile == "auto" && !opt.SkipMultusConfWatch
if watchChanges {
fmt.Printf("Entering watch loop...\n")
masterConfigExists := true

outer:
for range time.Tick(1 * time.Second) {
for range watcher.C {
select {
case <-ctx.Done():
// signal received break from loop
Expand Down
4 changes: 4 additions & 0 deletions docs/how-to-use.md
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Expand Up @@ -627,6 +627,10 @@ master CNI configuration and kubeconfig. when such change detected, the script w

--skip-config-watch

The poll interval of the config changes watcher is configurable with `--multus-config-watch-timer=<duration>`. Please refer to the [time.Duration](https://pkg.go.dev/time#Duration) to configure the time interval. The following example watches the config change every 5 minutes.

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Let's also provide a link to whatever appropriate go docs about what are valid values for "duration" here. Otherwise, lgtm

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@dougbtv Thanks. I've updated the description with the go doc link for the duration. Please let me know if any suggestions.

--multus-config-watch-timer=5m

Additionally when using CRIO, you may wish to have the CNI config file that's used as the source for `--multus-conf-file=auto` renamed. This boolean option when set to true automatically renames the file with a `.old` suffix to the original filename.

--rename-conf-file=true
Expand Down