kubeadm: Make self-hosting work and split it out to a phase #47435

luxas · 2017-06-13T15:29:56Z

What this PR does / why we need it:

Removes the old self-hosting code
Puts the new self-hosting code in phases/selfhosting
- The new code reads manifests from disk (static pods)...
- ...mutates the PodSpec as necessary...
- ...and posts the DaemonSet to the API Server...
- ...and waits for it to come up
Uses DaemonSets for all control plane components
Creates a kubeadm alpha phase selfhosting command that can be invoked against any kubeadm-cluster after install.

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

fixes: kubernetes/kubeadm#127
(large part of at least)

Special notes for your reviewer:

Please only review the fourth commit, based on #47345

Release note:

kubeadm: Make self-hosting work by using DaemonSets and split it out to a phase that can be invoked via the CLI

@kubernetes/sig-cluster-lifecycle-pr-reviews @jbeda

timothysc · 2017-06-14T02:26:29Z

So this stuff needs to be merged in order, so marking this one as do-not-merge till the others are ready.

timothysc · 2017-06-14T02:28:21Z

cmd/kubeadm/app/cmd/phases/selfhosting.go

+	kubeconfigutil "k8s.io/kubernetes/cmd/kubeadm/app/util/kubeconfig"
+)
+
+func NewCmdSelfhosting() *cobra.Command {


We should follow the conventions of // godoc on any public facing f(n)s.

timothysc · 2017-06-14T02:28:38Z

cmd/kubeadm/app/phases/selfhosting/podspec_mutation.go

+	kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
+)
+
+func MutatePodSpec(name string, podSpec *v1.PodSpec) {


timothysc · 2017-06-14T02:31:30Z

cmd/kubeadm/app/phases/selfhosting/podspec_mutation.go

+	}
+}
+
+func addFileLockToPodSpec(podSpec *v1.PodSpec) {


I'm not entirely clear what you are doing here and why?

timothysc · 2017-06-14T02:39:08Z

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

+		// Wait for the self-hosted component to come up
+		kubeadmutil.WaitForPodsWithLabel(client, component, fmt.Sprintf("k8s-app=self-hosted-%s", component))
+
+		manifestPath := buildStaticManifestFilepath(component)


Could you comment this, it's totally unclear to anyone not working in this area what you are doing, and reference your phases.

timothysc · 2017-06-14T02:40:14Z

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

+
+		manifestPath := buildStaticManifestFilepath(component)
+		if err := os.RemoveAll(manifestPath); err != nil {
+			return fmt.Errorf("unable to delete static pod manifest for %s [%v]", component, err)


Can't we now potentially leave it in a 1/2 deployed state? and future creates could fail?

timothysc · 2017-06-14T02:41:29Z

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

+}
+
+func buildDaemonSet(name string) (*extensions.DaemonSet, error) {
+	podSpec, err := loadPodSpecFromDisk(name)


Again comment on why you are loading from the original static manifest.

timothysc · 2017-06-14T02:42:54Z

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

+
+	return &extensions.DaemonSet{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "self-hosted-" + name,


Do we want to add either a label or name that it was kubeadm that did it?

I don't know, what do you prefer?

timothysc · 2017-06-14T02:44:54Z

cmd/kubeadm/app/phases/selfhosting/selfhosting_test.go

+*/
+
+// TODO: unit tests
+package selfhosting


Why even have this? ¯_(ツ)_/¯

I'll add unit tests shortly

timothysc · 2017-06-14T02:46:12Z

cmd/kubeadm/app/util/apiclient.go

+// WaitForPodsWithLabel will lookup pods with the given label and wait until they are all
+// reporting status as running.
+func WaitForPodsWithLabel(client *clientset.Clientset, name, labelKeyValPair string) {
+	wait.PollInfinite(kubeadmconstants.APICallRetryInterval, func() (bool, error) {


Shouldn't we poll timeout in case something weird happens on the kubelet? B/c nothing weird ever happens on the kubelet.

What would you prefer? How long should we wait before timing out?

How about a timeout flag in the selfhosted command?

Can be a future improvement

Can you open an issue so we won't forget? Assign it to me if you like and I should get to it soon.

GheRivero · 2017-06-29T11:17:20Z

cmd/kubeadm/app/phases/selfhosting/podspec_mutation.go

+package selfhosting
+
+import (
+	"k8s.io/client-go/pkg/api/v1"


Moved recently to k8s.io/api/core/v1

luxas · 2017-07-04T19:38:51Z

@timothysc PTAL

Rebased
Improved the code
Commented all functions
Added lots of unit tests (in their own commit for easier reviewing)

This PR might look scary with a lot of changed lines, but in fact the actual code decreases with ~80 LoC.

However, the self-hosting code didn't have any comments or unit tests before, but now I've added ~700 LoC of unit tests :).
It's also possible to cleanup more code after this PRs is merged, but saving those cleanup tasks to a future PR

cc @jamiehannaford PTAL

0xmichalis · 2017-07-04T20:38:27Z

cmd/kubeadm/app/phases/selfhosting/podspec_mutation.go

+	kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
+)
+
+// MutatePodSpec makes a Static Pod-hosted PodSpec suitable for self-hosting


nit: lowercase

0xmichalis · 2017-07-04T20:46:37Z

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

+// 8. In order to avoid race conditions, we're still making sure the API /healthz endpoint is healthy
+// 9. Do that for the kube-apiserver, kube-controller-manager and kube-scheduler in a loop
+func CreateSelfHostedControlPlane(client *clientset.Clientset) error {
+	components := []string{kubeAPIServer, kubeControllerManager, kubeScheduler}


Comment that the sequence matters or that it doesn't.

0xmichalis · 2017-07-04T20:52:48Z

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

+
+		// Create the DaemonSet in the API Server
+		if _, err := client.ExtensionsV1beta1().DaemonSets(metav1.NamespaceSystem).Create(ds); err != nil {
+			return fmt.Errorf("failed to create self-hosted %q daemonset [%v]", componentName, err)


Do we want to tolerate AlreadyExists errors?

0xmichalis · 2017-07-04T21:01:19Z

cmd/kubeadm/app/util/apiclient.go

+		}
+		for _, pod := range apiPods.Items {
+			fmt.Printf("[apiclient] Pod %s status: %s\n", pod.Name, pod.Status.Phase)
+			if pod.Status.Phase != v1.PodRunning {


Do you prefer adding the /healthz check inside WaitForAPI as a readiness probe inside the static pod or by mutating the DaemonSet pod spec and then wait for Ready pods here instead of Running?

We might need to disable healthz check on the bootstrap apiserver for self-hosted etcd due to various race conditions, so I think this is the best solution for time being

jamiehannaford

Looks great overall, just a few minor issues

jamiehannaford · 2017-07-05T09:31:17Z

cmd/kubeadm/app/cmd/init.go

@@ -132,6 +133,10 @@ func NewCmdInit(out io.Writer) *cobra.Command {
 		&skipTokenPrint, "skip-token-print", skipTokenPrint,
 		"Skip printing of the default bootstrap token generated by 'kubeadm init'",
 	)
+	cmd.PersistentFlags().BoolVar(
+		&cfg.SelfHosted, "self-hosted", cfg.SelfHosted,
+		"If kubeadm should make this control plane self-hosted",


Do we consider self-hosted experimental? If so, we might want to add something like [experimental]. We could also log a warning at the top of the init output

Do we consider self-hosted experimental?

I think so... Or alpha

jamiehannaford · 2017-07-05T09:43:51Z

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

+
+		// Create the DaemonSet in the API Server
+		if _, err := client.ExtensionsV1beta1().DaemonSets(metav1.NamespaceSystem).Create(ds); err != nil {
+			return fmt.Errorf("failed to create self-hosted %q daemonset [%v]", componentName, err)


jamiehannaford · 2017-07-05T09:44:57Z

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

+			Name:      "self-hosted-" + name,
+			Namespace: metav1.NamespaceSystem,
+			Labels: map[string]string{
+				"k8s-app": selfHostingLabelValuePrefix + name,


I've seen in bootkube a tier=control-plane label, do you think it's useful to add or not?

I don't think so, as I don't recognize any practical purpose for it
The less code the better

jamiehannaford · 2017-07-05T10:26:19Z

cmd/kubeadm/app/phases/selfhosting/podspec_mutation.go

+			setMasterTolerationOnPodSpec,
+			setRightDNSPolicyOnPodSpec,
+		},
+	}


For self-hosted etcd we'll also need to modify the podSpec command (mainly the apiserver). I assume we can pass in the additional flags which either overwrite or append to the existing one.

Yes. I have coded some methods for modifying .command but didn't include that in this PR for easier reviewing

jamiehannaford · 2017-07-05T10:26:35Z

cmd/kubeadm/app/phases/selfhosting/podspec_mutation.go

+}
+
+// addNodeSelectorToPodSpec makes Pod require to be scheduled on a node marked with the master label
+func addNodeSelectorToPodSpec(podSpec *v1.PodSpec) {


👍 Really like this composable way of mutating the original podSpec

jamiehannaford · 2017-07-05T10:39:52Z

cmd/kubeadm/app/phases/selfhosting/selfhosting_test.go

+    - --kubeconfig=/etc/kubernetes/controller-manager.conf
+    - --controllers=*,bootstrapsigner,tokencleaner
+    - --root-ca-file=/etc/kubernetes/pki/ca.crt
+    - --address=127.0.0.1


can we change this arg to 0.0.0.0. that will allow us to take off host network. same for scheduler

Hmm, I'm not sure why that would allow us to remove hostNetwork...
As I understand this, the current state is "use the host's network, but don't expose anything widely"
We still need hostNetwork for being able to run things without CNI set up.

jamiehannaford · 2017-07-05T10:40:36Z

cmd/kubeadm/app/phases/selfhosting/selfhosting_test.go

+    livenessProbe:
+      failureThreshold: 8
+      httpGet:
+        host: 127.0.0.1


also, can we make this an empty string? it defaults to pod IP if left blank. I see no reason to hardcode localhost here, especially if we want to move off host network

I'd rather not do that in this PR. It's set in app/phases/controlplane/manifests.go since a long time back.

This is just testing data, but based on actual output from kubeadm.

Also ref this statement: https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/

Here’s one scenario where you would set it. Suppose the Container listens on 127.0.0.1 and the Pod’s hostNetwork field is true. Then host, under httpGet, should be set to 127.0.0.1.

To me it seems like it's required for hostNetwork=true

Yeah, but my point is that the scheduler and controller manager don't need to be on host network. For apiserver (which is on host network), leaving blank will still work because it'll just ping that pod's IP

They must be on the host network due to that CNI is uninitialized, so we don't have any other option here really

jamiehannaford · 2017-07-05T10:43:01Z

cmd/kubeadm/app/phases/selfhosting/selfhosting_test.go

+	}
+}
+
+func createTempFileWithContent(content []byte) (string, error) {


minor nit: I don't think unit tests should be modify external state - whether it be filesystem or DB. But due to the current state of our e2e tests maybe it's better to put here instead. What do you think?

I've seen lots of unit tests that create temp files and then remove them.
A quick search for ioutil.TempFile( for files kubernetes/*_test.go yielded 170 results.
It's a pattern I definitely think we can use

jamiehannaford · 2017-07-05T10:46:02Z

cmd/kubeadm/app/phases/selfhosting/podspec_mutation.go

+		kubeControllerManager: {
+			addNodeSelectorToPodSpec,
+			setMasterTolerationOnPodSpec,
+			setRightDNSPolicyOnPodSpec,


I noticed bootkube's self-hosted controller manager uses Default as the DNS policy. @aaronlevy is there any reason for that? Just want to make sure there's no corner cases we're forgetting about.

Looking back at the git blame I believe it had to do with the controller-manager needing to use the dns of the host when cloud-providers were enabled (for example, aws hostnames won't resolve unless you're using the host defined dns server). And at that time DNSClusterFirstWithHostNet didn't exist -- but seems like a more reasonable choice now (opened a PR to change in bootkube: kubernetes-retired/bootkube#629)

jamiehannaford · 2017-07-05T10:49:27Z

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

+		// Wait for the self-hosted component to come up
+		kubeadmutil.WaitForPodsWithLabel(client, componentName, buildSelfHostedWorkloadLabelQuery(componentName))
+
+		// Remove the old Static Pod manifest


Can we put all the teardown (L79-87) into a new function and have the init call it after CreateSelfHostedControlPlane? The reason I ask is that it'll need to happen after the etcd-operator deployment and pivot, so doing it now will reduce the future delta

Discussed with @jamiehannaford on Slack and decided to hold off that for now, and re-order the sequence instead. This is fine as-is now and we'll change it if we change it in the future.

timothysc

Please address mine and other comments.

poke again when done.

timothysc · 2017-07-05T14:32:51Z

cmd/kubeadm/app/cmd/init.go

@@ -132,6 +133,10 @@ func NewCmdInit(out io.Writer) *cobra.Command {
 		&skipTokenPrint, "skip-token-print", skipTokenPrint,
 		"Skip printing of the default bootstrap token generated by 'kubeadm init'",
 	)
+	cmd.PersistentFlags().BoolVar(
+		&cfg.SelfHosted, "self-hosted", cfg.SelfHosted,
+		"If kubeadm should make this control plane self-hosted",


Do we consider self-hosted experimental?

I think so... Or alpha

timothysc · 2017-07-05T14:55:32Z

cmd/kubeadm/app/phases/selfhosting/podspec_mutation.go

+// MutatePodSpec makes a Static Pod-hosted PodSpec suitable for self-hosting
+func mutatePodSpec(name string, podSpec *v1.PodSpec) {
+	mutators := map[string][]func(*v1.PodSpec){
+		kubeAPIServer: {


Did you merge the secret change? I don't see how you can float without it.

Hmm, I'm not sure what you mean... This works

timothysc · 2017-07-05T15:06:35Z

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

+// 2. Extract the PodSpec from that Static Pod specification
+// 3. Mutate the PodSpec to be compatible with self-hosting (add the right labels, taints, etc. so it can schedule correctly)
+// 4. Build a new DaemonSet object for the self-hosted component in question. Use the PodSpec above mentioned PodSpec
+// 5. Create the DaemonSet resource. Wait for the Pod to become Running.


Wait until the Pods are running ;-)

timothysc · 2017-07-05T15:09:22Z

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

+// 8. In order to avoid race conditions, we're still making sure the API /healthz endpoint is healthy
+// 9. Do that for the kube-apiserver, kube-controller-manager and kube-scheduler in a loop
+func CreateSelfHostedControlPlane(client *clientset.Clientset) error {
+	components := []string{kubeAPIServer, kubeControllerManager, kubeScheduler}


Do we want to treat them as separate Pods, or containers as part of the same pod?

I'm not certain if we ever discussed a tradeoff here?

The reason I ask is it simplifies the model.

Maybe folks would want to scale more apiservers than schedulers/CMs, or vice versa? Just a thought

I think it makes a lot of sense to decouple as three different DaemonSets (==3 different Pods) instead of having one DS and one Pod per master.

timothysc · 2017-07-05T15:12:03Z

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

+	// Return a DaemonSet based on that Spec
+	return &extensions.DaemonSet{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "self-hosted-" + name,


+1 for mutating function with strings pushed to consts.

luxas · 2017-07-05T16:01:02Z

@timothysc @jamiehannaford @Kargakis PTAL, updated the PR

luxas · 2017-07-05T17:43:39Z

/retest

jamiehannaford

👍

0xmichalis · 2017-07-06T01:11:38Z

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

+				return fmt.Errorf("failed to create self-hosted %q daemonset [%v]", componentName, err)
+			}
+
+			if _, err := client.ExtensionsV1beta1().DaemonSets(metav1.NamespaceSystem).Update(ds); err != nil {


We may fail on status updates in the DaemonSet so I would make this retriable on 409s. TODO is also fine.

0xmichalis · 2017-07-06T01:12:09Z

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

+			}
+
+			if _, err := client.ExtensionsV1beta1().DaemonSets(metav1.NamespaceSystem).Update(ds); err != nil {
+				return fmt.Errorf("failed to create self-hosted %q daemonset [%v]", componentName, err)


failed to update

timothysc

/lgtm

k8s-github-robot · 2017-07-06T13:54:30Z

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: luxas, timothysc
We suggest the following additional approver: jbeda

Assign the PR to them by writing /assign @jbeda in a comment when ready.

Associated issue: 127

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

Needs approval from an approver in each of these OWNERS Files:

~~cmd/kubeadm/OWNERS~~ [luxas]
hack/OWNERS

You can indicate your approval by writing /approve in a comment
You can cancel your approval by writing /approve cancel in a comment

luxas · 2017-07-06T17:57:18Z

Squashed to two logical comments. Reapplying the labels

luxas · 2017-07-06T18:05:42Z

/retest

k8s-github-robot · 2017-07-06T19:43:39Z

Automatic merge from submit-queue (batch tested with PRs 47435, 46044)

luxas assigned timothysc and mikedanese Jun 13, 2017

k8s-ci-robot added sig/cluster-lifecycle Categorizes an issue or PR as relevant to SIG Cluster Lifecycle. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. labels Jun 13, 2017

k8s-github-robot added size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. release-note Denotes a PR that will be considered when it comes time to generate release notes. labels Jun 13, 2017

timothysc added this to the v1.8 milestone Jun 14, 2017

timothysc added the do-not-merge DEPRECATED. Indicates that a PR should not merge. Label can only be manually applied/removed. label Jun 14, 2017

timothysc suggested changes Jun 14, 2017

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luxas changed the title ~~kubeadm: Make self-hosting work and split it out to a phase~~ WIP: kubeadm: Make self-hosting work and split it out to a phase Jun 14, 2017

luxas mentioned this pull request Jun 19, 2017

Follow-up selfhosting improvements kubernetes/kubeadm#127

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4 tasks

k8s-github-robot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jun 20, 2017

luxas mentioned this pull request Jun 24, 2017

Use Secrets for files that self-hosted pods depend on #42548

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GheRivero reviewed Jun 29, 2017

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luxas force-pushed the kubeadm_new_selfhosting branch from e203fbc to 0e7fbed Compare July 4, 2017 16:28

k8s-github-robot removed the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jul 4, 2017

luxas changed the title ~~WIP: kubeadm: Make self-hosting work and split it out to a phase~~ kubeadm: Make self-hosting work and split it out to a phase Jul 4, 2017

luxas force-pushed the kubeadm_new_selfhosting branch from 0e7fbed to b2f68de Compare July 4, 2017 19:31

luxas removed the do-not-merge DEPRECATED. Indicates that a PR should not merge. Label can only be manually applied/removed. label Jul 4, 2017

k8s-github-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Jul 4, 2017

luxas force-pushed the kubeadm_new_selfhosting branch from b2f68de to 8ad4ebe Compare July 4, 2017 20:14

k8s-github-robot removed the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Jul 4, 2017

0xmichalis reviewed Jul 4, 2017

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jamiehannaford suggested changes Jul 5, 2017

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k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Jul 6, 2017

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luxas added 2 commits July 6, 2017 20:54

kubeadm: Make self-hosting work and split out to a phase

d14478f

kubeadm self-hosting: unit tests and bazel

9f1c5a6

luxas force-pushed the kubeadm_new_selfhosting branch from 2b8a504 to 9f1c5a6 Compare July 6, 2017 17:55

k8s-github-robot removed the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Jul 6, 2017

luxas added approved Indicates a PR has been approved by an approver from all required OWNERS files. lgtm "Looks good to me", indicates that a PR is ready to be merged. labels Jul 6, 2017

k8s-github-robot merged commit b00df7e into kubernetes:master Jul 6, 2017

kubeadm: Make self-hosting work and split it out to a phase #47435

kubeadm: Make self-hosting work and split it out to a phase #47435

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k8s-github-robot commented Jul 6, 2017

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