Add support for binaries to run as Windows services #60144

alinbalutoiu · 2018-02-21T17:29:25Z

What this PR does / why we need it:
Add support for binaries to run as Windows services

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #59562

Special notes for your reviewer:

Release note:

kubelet and kube-proxy can now be ran as Windows services

aserdean · 2018-02-21T17:33:41Z

Acked-by: Alin Gabriel Serdean aserdean@ovn.org
/assign @bsteciuk @michmike .

bsteciuk · 2018-02-21T21:32:47Z

/sig windows

PatrickLang · 2018-02-21T22:00:54Z

@jstarks or @jhowardmsft can you take a look since you implemented something similar for dockerd?

PatrickLang · 2018-02-21T22:39:56Z

pkg/util/service/service_windows.go

+	}
+	t := []scAction{
+		{Type: scActionRestart, Delay: uint32(60 * time.Second / time.Millisecond)},
+		{Type: scActionRestart, Delay: uint32(60 * time.Second / time.Millisecond)},


I think it would be better to bump this up an order of magnitude from 1 to 10 minutes for second retry. I think that would be better for dealing with the case where a dependent service like dockerd.exe isn't running yet.

For others reviewing - here's the Windows SDK doc on how restart actions work:
https://msdn.microsoft.com/en-us/library/windows/desktop/ms685939(v=vs.85).aspx

As written, it will retry after one minute, again after 1 more minute, then wait 24 hours before trying again

Sure we can change it. I wouldn't go for a hard dependency on dockerd.exe since kubelet will be used using a different CRI in the future.

To be honest this is a default value for service creation. The hardcoded values can substitute for a default value, but I would rather add documentation on how to config the service as a sysadmin (i.e. changing start type, adding triggers, modifying restart actions as people pleases). Do you know where we can add such a documentation?

Changed the second timeout from 1 minute to 10 minutes.

PatrickLang · 2018-02-21T22:41:08Z

I added a short comment. Thanks for submitting this and getting restart actions included!

bsteciuk

These code changes look good to me. I also built the bins and verified I was able to register/unregister kube-proxy & kubelet services, as well as do a kubeadm join after setting up the kubelet service (passes kubeadm pre-flight check validating kubelet is setup as a service)

cblecker · 2018-02-23T01:33:58Z

@alinbalutoiu You've added files to vendor without going through the correct process. As such, this will fail CI.
The proper process for adding dependencies is here: https://github.com/kubernetes/community/blob/master/contributors/devel/godep.md

alinbalutoiu · 2018-02-23T15:39:12Z

@cblecker thanks for pointing that out. Done.

cblecker · 2018-02-23T16:47:35Z

/ok-to-test

michmike · 2018-02-23T17:20:44Z

/approve
/lgtm

michmike · 2018-02-23T17:21:31Z

/assign @thockin

michmike · 2018-02-23T17:23:16Z

@alinbalutoiu please also add the status/approved-for-milestone label

alinbalutoiu · 2018-02-23T18:44:04Z

Fixed the boilerplate header for service_windows.go, added missing licenses and added comments to the exported functions from pkg/util/service package. This were causing the build to fail.

PatrickLang · 2018-03-06T18:58:41Z

/priority important-soon

PatrickLang · 2018-03-06T19:01:26Z

Alright - think labels are fixed. Just need final review closed from @mtaufen I hope?

mtaufen

Updates mostly look good, I had a few more suggestions to tighten things up.

mtaufen · 2018-03-06T19:06:18Z

cmd/kube-proxy/app/init_windows.go

+)
+
+var (
+	flRunService bool


@ncdc this global state look good? Or does kube-proxy prefer something akin to KubeletFlags?

I had put everything into the Options struct, such as CleanupAndExit:

kubernetes/cmd/kube-proxy/app/server.go

Lines 93 to 100 in 86ca3af

// Options contains everything necessary to create and run a proxy server.

type Options struct {

// ConfigFile is the location of the proxy server's configuration file.

ConfigFile string

// WriteConfigTo is the path where the default configuration will be written.

WriteConfigTo string

// CleanupAndExit, when true, makes the proxy server clean up iptables rules, then exit.

CleanupAndExit bool

And then the flag registered directly into that field:

kubernetes/cmd/kube-proxy/app/server.go

Lines 120 to 124 in 86ca3af

// AddFlags adds flags to fs and binds them to options.

func (o *Options) AddFlags(fs *pflag.FlagSet) {

fs.StringVar(&o.ConfigFile, "config", o.ConfigFile, "The path to the configuration file.")

fs.StringVar(&o.WriteConfigTo, "write-config-to", o.WriteConfigTo, "If set, write the default configuration values to this file and exit.")

fs.BoolVar(&o.CleanupAndExit, "cleanup-iptables", o.CleanupAndExit, "If true cleanup iptables and ipvs rules and exit.")

But I realize this is OS specific and it doesn't make sense to add it to kube-proxy's Options struct, so it's probably ok like this.

FWIW, I wouldn't prefix the package variable's name with fl. I'd probably call it runAsWIndowsServer or something to that effect instead.

Done. I changed the variable name into WindowsService to be consistent with Kubelet as @mtaufen requested.

mtaufen · 2018-03-06T19:10:38Z

cmd/kubelet/app/options/osflags_windows.go

+)
+
+var (
+	FlRunService bool


This should be a subfield of the KubeletFlags struct in options/options.go. Leave a comment above the field noting that its corresponding flag only gets registered in Windows builds.

Let's also rename it to WindowsService here and in kube-proxy so it matches the flag name.

mtaufen · 2018-03-06T19:17:04Z

cmd/kubelet/app/options/osflags_windows.go

+)
+
+// AddOSFlags adds specific OS flags
+func AddOSFlags(fs *pflag.FlagSet) {


Modify this as follows when you move the destination value into KubeletFlags, so we're consistent with KubeletFlags.AddFlags:

func (f *KubeletFlags) addOSFlags(fs *pflag.FlagSet) { fs.BoolVar(&f.WindowsService, "windows-service", f.WindowsService, "Enable Windows Service Control Manager API integration") }

and now call it at the beginning of KubeletFlags.AddFlags instead of in cmd/kubelet/app/server.go (I made KubeletFlags.addOSFlags private, since there shouldn't be a reason to call this separately from KubeletFlags.AddFlags).

mtaufen · 2018-03-06T19:17:53Z

cmd/kubelet/app/server.go

@@ -238,6 +238,7 @@ HTTP server: The kubelet can also listen for HTTP and respond to a simple API
 	kubeletFlags.AddFlags(cleanFlagSet)
 	options.AddKubeletConfigFlags(cleanFlagSet, kubeletConfig)
 	options.AddGlobalFlags(cleanFlagSet)
+	options.AddOSFlags(cleanFlagSet)


merge with kubeletFlags.AddFlags, per above comment

mtaufen · 2018-03-06T19:24:52Z

cmd/kubelet/app/init_windows.go

+	serviceName = "kubelet"
+)
+
+func initForOS() error {


When you remove the global FlRunService var in favor of KubeletFlags.WindowsService, you'll have to pass it in as an arg here, e.g. func initForOS(windowsService bool) error.

I know that's not as pretty a function signature, but it's better than global state floating around and keeps things consistent with the other flags.

mtaufen

One nit, and also want @ncdc to give a final thumbs-up on the kube-proxy stuff, otherwise LGTM.

mtaufen · 2018-03-06T23:33:08Z

cmd/kube-proxy/app/server.go

@@ -100,6 +100,9 @@ type Options struct {
 	CleanupAndExit bool
 	// CleanupIPVS, when true, makes the proxy server clean up ipvs rules before running.
 	CleanupIPVS bool
+	// WindowsService should be set to true if kubelet is running as a service on Windows.


s/kubelet/kube-proxy

This patch adds support for kubernetes to integrate with Windows SCM. As a first step both `kubelet` and `kube-proxy` can be registered as a service. To create the service: PS > sc.exe create <component_name> binPath= "<path_to_binary> --service <other_args>" CMD > sc create <component_name> binPath= "<path_to_binary> --service <other_args>" Please note that if the arguments contain spaces, it must be escaped. Example: PS > sc.exe create kubelet binPath= "C:\kubelet.exe --service --hostname-override 'minion' <other_args>" CMD > sc create kubelet binPath= "C:\kubelet.exe --service --hostname-override 'minion' <other_args>" Example to start the service: PS > Start-Service kubelet; Start-Service kube-proxy CMD > net start kubelet && net start kube-proxy Example to stop the service: PS > Stop-Service kubelet (-Force); Stop-Service kube-proxy (-Force) CMD > net stop kubelet && net stop kube-proxy Example to query the service: PS > Get-Service kubelet; Get-Service kube-proxy; CMD > sc.exe queryex kubelet && sc qc kubelet && sc.exe queryex kube-proxy && sc.exe qc kube-proxy Signed-off-by: Alin Balutoiu <abalutoiu@cloudbasesolutions.com> Signed-off-by: Alin Gabriel Serdean <aserdean@ovn.org> Co-authored-by: Alin Gabriel Serdean <aserdean@ovn.org>

This is needed for service manager support on Windows in kubernetes binaries.

alinbalutoiu · 2018-03-07T00:55:14Z

/test pull-kubernetes-kubemark-e2e-gce

alinbalutoiu · 2018-03-07T08:11:48Z

/test pull-kubernetes-kubemark-e2e-gce

alinbalutoiu · 2018-03-07T14:40:23Z

/test pull-kubernetes-kubemark-e2e-gce

mtaufen · 2018-03-07T17:30:11Z

I pinged @ncdc last night on Slack, and he was cool with the kube-proxy side.
Kubelet side LGTM.
/lgtm

k8s-ci-robot · 2018-03-07T17:30:19Z

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alinbalutoiu, aserdean, michmike, mtaufen, thockin

The full list of commands accepted by this bot can be found here.

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k8s-github-robot · 2018-03-07T17:30:38Z

/test all [submit-queue is verifying that this PR is safe to merge]

k8s-github-robot · 2018-03-07T17:31:07Z

[MILESTONENOTIFIER] Milestone Pull Request: Up-to-date for process

@alinbalutoiu @michmike @mtaufen @thockin

Pull Request Labels

sig/windows: Pull Request will be escalated to these SIGs if needed.
priority/important-soon: Escalate to the pull request owners and SIG owner; move out of milestone after several unsuccessful escalation attempts.
kind/feature: New functionality.

Help

k8s-github-robot · 2018-03-07T18:33:41Z

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions here.

k8s-ci-robot requested review from cblecker, dchen1107, pmorie and smarterclayton February 21, 2018 17:30

k8s-ci-robot added the sig/windows Categorizes an issue or PR as relevant to SIG Windows. label Feb 21, 2018

PatrickLang reviewed Feb 21, 2018

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alinbalutoiu force-pushed the master branch from 0459b7e to 8e2c93b Compare February 22, 2018 11:29

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alinbalutoiu force-pushed the master branch from 8e2c93b to 344e5f9 Compare February 23, 2018 13:46

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alinbalutoiu and others added 2 commits March 7, 2018 00:51

Add sys/windows/svc to vendor

448ed6e

This is needed for service manager support on Windows in kubernetes binaries.

alinbalutoiu force-pushed the master branch from 9d9aef5 to 448ed6e Compare March 6, 2018 23:52

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k8s-github-robot merged commit b30fed0 into kubernetes:master Mar 7, 2018

PatrickLang mentioned this pull request Mar 9, 2018

Remove NSSM and use kubelet.exe and kube-proxy --service flags instead Azure/acs-engine#2419

Closed

alinbalutoiu mentioned this pull request Jun 14, 2018

move cni to cnishim/cniserver architecture ovn-org/ovn-kubernetes#354

Merged

PatrickLang mentioned this pull request Sep 14, 2018

Cleanup Windows installations Azure/acs-engine#3851

Closed

8 tasks

ptylenda mentioned this pull request Sep 21, 2018

Discussion roadmap v1.0 pablodav/kubernetes-for-windows#13

Closed

PatrickLang mentioned this pull request Sep 20, 2019

Remove NSSM dependency from Windows nodes Azure/aks-engine#2003

Closed

2 tasks

danwinship mentioned this pull request Jan 21, 2024

KEP-784: Update design-details kubernetes/enhancements#4337

Merged

	// Options contains everything necessary to create and run a proxy server.
	type Options struct {
	// ConfigFile is the location of the proxy server's configuration file.
	ConfigFile string
	// WriteConfigTo is the path where the default configuration will be written.
	WriteConfigTo string
	// CleanupAndExit, when true, makes the proxy server clean up iptables rules, then exit.
	CleanupAndExit bool

	// AddFlags adds flags to fs and binds them to options.
	func (o Options) AddFlags(fs pflag.FlagSet) {
	fs.StringVar(&o.ConfigFile, "config", o.ConfigFile, "The path to the configuration file.")
	fs.StringVar(&o.WriteConfigTo, "write-config-to", o.WriteConfigTo, "If set, write the default configuration values to this file and exit.")
	fs.BoolVar(&o.CleanupAndExit, "cleanup-iptables", o.CleanupAndExit, "If true cleanup iptables and ipvs rules and exit.")

Add support for binaries to run as Windows services #60144

Add support for binaries to run as Windows services #60144

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alinbalutoiu commented Mar 7, 2018

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