Update docs/admin/kubeadm.md to cover self-hosting in 1.8. #5497

mattmoyer · 2017-09-15T21:57:37Z

This is a new beta feature in 1.8. See kubernetes/enhancements#415 for details.

cc @luxas @timothysc @jdumars @kubernetes/sig-cluster-lifecycle-misc

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roberthbailey · 2017-09-16T03:38:47Z

docs/admin/kubeadm.md

+plane. This means that key components such as the API server, controller
+manager, and scheduler run as normal pods instead of static pods.
+
+Self-hosting is beta in kubeadm 1.8 and is expected to become the default in


I can't find anything definitive from our sig meeting notes about whether we decided to call self hosting alpha or beta in 1.8.

We decided that this is alpha

Fixed, thanks. I'm happy we decided that.

I couldn't remember either but found https://github.com/kubernetes/kubernetes/blob/8163d147ec666cea006872f5ff6a65b4f9f5b542/cmd/kubeadm/app/features/features.go#L29. We should probably fix that comment.

luxas · 2017-09-16T17:55:50Z

docs/admin/kubeadm.md

+## Self-hosting the Kubernetes control plane  {#self-hosting}
+As of 1.8, kubeadm can experimentally create a _self-hosted_ Kubernetes control
+plane. This means that key components such as the API server, controller
+manager, and scheduler run as normal pods instead of static pods.


normal pods

Please elaborate

I took a shot at elaborating a little here.

luxas · 2017-09-16T17:56:12Z

docs/admin/kubeadm.md

+
+Self-hosting is beta in kubeadm 1.8 and is expected to become the default in
+kubeadm 1.9. To create a self-hosted cluster, pass the
+`--feature-gates=SelfHosting=true` to `kubeadm init`.


Tell the user about the Limitations (don't reboot 😄)
Can also tell a bit more about the actual process described in https://github.com/kubernetes/kubeadm/blob/master/docs/design/design_v1.8.md

Done. Please let me know if what I wrote is technically accurate.

luxas

Basically LGTM, only some nits.

@mattmoyer Only docs PR left after this is one that updates the generic getting started guide... At least, please go through it and see if any changes should be made there.

luxas · 2017-09-17T19:46:42Z

docs/admin/kubeadm.md

+
+#### Caveats
+Kubeadm self-hosting in 1.8 has some important limitations. In particular, a
+self-hosted cluster cannot currently recover from a simultaneous reboot of all


of any master node. No matter how many of them you have, the one you reboot won't come back ;)
Also we shouldn't imply that we support more than one master node as other caveats take place then

Ah, I see. I guess because the master node's kubelet is configured to talk to the localhost host port so it won't even come back online if you did manually set up multiple masters. I'll clarify.

Do we have any ideas for a manual procedure to recover a cluster in this state?

luxas · 2017-09-17T19:47:33Z

docs/admin/kubeadm.md

+volumes. Except for initial creation, these credentials are not managed by
+kubeadm. You can use `--feature-gates=StoreCertsInSecrets=true` to enable an
+experimental mode where control plane credentials are loaded from Secrets
+instead. This may or may not be appropriate for your environment.


Say something that using Secrets might be less secure as the only thing standing between the cluster CA and your workloads is RBAC...

luxas · 2017-09-17T19:48:11Z

docs/admin/kubeadm.md

+document](https://github.com/kubernetes/kubeadm/blob/master/docs/design/design_v1.8.md#optional-self-hosting).
+In summary, `kubeadm init --feature-gates=SelfHosting=true` works as follows:
+
+ 1. Kubeadm creates static pod YAML files in `/etc/kubernetes/manifests/`.


... as usual

luxas · 2017-09-18T18:19:40Z

Yeah, but nothing to document 100% yet... Basically injecting the API server manifest temporarily as a static pod until the self hosted thing can pivot fully

…

On 18 Sep 2017, at 21:09, Matt Moyer ***@***.***> wrote: @mattmoyer commented on this pull request. In docs/admin/kubeadm.md: > @@ -820,6 +820,58 @@ This means you can, for example, prepopulate `/etc/kubernetes/pki/ca.crt` and `/etc/kubernetes/pki/ca.key` with an existing CA, which then will be used for signing the rest of the certs. +## Self-hosting the Kubernetes control plane {#self-hosting} +As of 1.8, kubeadm can experimentally create a _self-hosted_ Kubernetes control +plane. This means that key components such as the API server, controller +manager, and scheduler run as [DaemonSet pods](/docs/concepts/workloads/controllers/daemonset/) +configured via the Kubernetes API instead of [static pods](/docs/tasks/administer-cluster/static-pod/) +configured in the kubelet via static files. + +Self-hosting is alpha in kubeadm 1.8 but is expected to become the default in +a future version. To create a self-hosted cluster, pass the `--feature-gates=SelfHosting=true` +flag to `kubeadm init`. + +#### Caveats +Kubeadm self-hosting in 1.8 has some important limitations. In particular, a +self-hosted cluster cannot currently recover from a simultaneous reboot of all Do we have any ideas for a manual procedure to recover a cluster in this state? — You are receiving this because your review was requested. Reply to this email directly, view it on GitHub, or mute the thread.

mattmoyer · 2017-09-18T18:46:10Z

@luxas addressed your comments (I think) and updated the generic getting started guide in #5524.

luxas · 2017-09-18T18:54:23Z

Thanks! From what I could see on my phone screen, Tech Review LGTM 👍🏻 /lgtm

…

On 18 Sep 2017, at 21:49, Matt Moyer ***@***.***> wrote: @luxas addressed your comments (I think) and updated the generic getting started guide in #5524. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.

This is a new beta feature in 1.8.

mattmoyer · 2017-09-19T01:11:55Z

Rebased onto the latest release-1.8 head.

@chenopis

* GC now supports non-core resources * Add two examples about how to analysis audits of kube-apiserver (#4264) * Deprecate system:nodes binding * [1.8] StatefulSet `initialized` annotation is now ignored. * inits the kubeadm upgrade docs addresses /issues/4689 * adds kubeadm upgrade cmd to ToC addresses /issues/4689 * add workload placement docs * ScaleIO - document udpate for 1.8 * Add documentation on storageClass.mountOptions and PV.mountOptions (#5254) * Add documentation on storageClass.mountOptions and PV.mountOptions * convert notes into callouts * Add docs for CustomResource validation add info about supported fields * advanced audit beta features (#5300) * Update job workload doc with backoff failure policy (#5319) Add to the Jobs documentation how to use the new backoffLimit field that limit the number of Pod failure before considering the Job as failed. * Documented additional AWS Service annotations (#4864) * Add device plugin doc under concepts/cluster-administration. (#5261) * Add device plugin doc under concepts/cluster-administration. * Update device-plugins.md * Update device-plugins.md Add meta description. Fix typo. Change bare metal deployment to manual deployment. * Update device-plugins.md Fix typo again. * Update page.version. (#5341) * Add documentation on storageClass.reclaimPolicy (#5171) * [Advanced audit] use new herf for audit-api (#5349) This tag contains all the changes in v1beta1 version. Update it now. * Added documentation around creating the InitializerConfiguration for the persistent volume label controller in the cloud-controller-manager (#5255) * Documentation for kubectl plugins (#5294) * Documentation for kubectl plugins * Update kubectl-plugins.md * Update kubectl-plugins.md * Updated CPU manager docs to match implementation. (#5332) * Noted limitation of alpha static cpumanager. * Updated CPU manager docs to match implementation. - Removed references to CPU pressure node condition and evictions. - Added note about new --cpu-manager-reconcile-period flag. - Added note about node allocatable requirements for static policy. - Noted limitation of alpha static cpumanager. * Move cpu-manager task link to rsc mgmt section. * init containers annotation removed in 1.8 (#5390) * Add documentation for TaintNodesByCondition (#5352) * Add documentation for TaintNodesByCondition * Update nodes.md * Update taint-and-toleration.md * Update daemonset.md * Update nodes.md * Update taint-and-toleration.md * Update daemonset.md * Fix deployments (#5421) * Document extended resources and OIR deprecation. (#5399) * Document extended resources and OIR deprecation. * Updated extended resources doc per reviews. * reverts extra spacing in _data/tasks.yml * addresses `kubeadm upgrade` review comments Feedback from @chenopis, @luxas, and @steveperry-53 addressed with this commit * HugePages documentation (#5419) * Update cpu-management-policies.md (#5407) Fixed the bad link. Modified "cpu" to "CPU". Added more 'yaml' as supplement. * Update RBAC docs for v1 (#5445) * Add user docs for pod priority and preemption (#5328) * Add user docs for pod priority and preemption * Update pod-priority-preemption.md * More updates * Update docs/admin/kubeadm.md for 1.8 (#5440) - Made a couple of minor wording changes (not strictly 1.8 related). - Did some reformatting (not strictly 1.8 related). - Updated references to the default token TTL (was infinite, now 24 hours). - Documented the new `--discovery-token-ca-cert-hash` and `--discovery-token-unsafe-skip-ca-verification` flags for `kubeadm join`. - Added references to the new `--discovery-token-ca-cert-hash` flag in all the default examples. - Added a new _Security model_ section that describes the security tradeoffs of the various discovery modes. - Documented the new `--groups` flag for `kubeadm token create`. - Added a note of caution under _Automating kubeadm_ that references the _Security model_ section. - Updated the component version table to drop 1.6 and add 1.8. - Update `_data/reference.yml` to try to get the sidebar fixed up and more consistent with `kubefed`. * Update StatefulSet Basics for 1.8 release (#5398) * addresses `kubeadm upgrade` review comments 2nd iteration review comments by @luxas * adds kubelet upgrade section to kubeadm upgrade * Fix a bulleted list on docs/admin/kubeadm.md. (#5458) I updated this doc yesterday and I was absolutely sure I fixed this, but I just saw that this commit got lost somehow. This was introduced recently in #5440. * Clarify the API to check for device plugins * Moving Flexvolume to separate out-of-tree section * addresses `kubeadm upgrade` review comments CC: @luxas * fixes kubeadm upgrade index * Update Stackdriver Logging documentation (#5495) * Re-update WordPress and MySQL PV doc to use apps/v1beta2 APIs (#5526) * Update statefulset concepts doc to use apps/v1beta2 APIs (#5420) * add document on kubectl's behavior regarding initializers (#5505) * Update docs/admin/kubeadm.md to cover self-hosting in 1.8. (#5497) This is a new beta feature in 1.8. * Update kubectl patch doc to use apps/v1beta2 APIs (#5422) * [1.8] Update "Run Applications" tasks to apps/v1beta2. (#5525) * Update replicated stateful application task for 1.8. * Update single instance stateful app task for 1.8. * Update stateless app task for 1.8. * Update kubectl patch task for 1.8. * fix the link of persistent storage (#5515) * update the admission-controllers.md index.md what-is-kubernetes.md link * fix the link of persistent storage * Add quota support for local ephemeral storage (#5493) * Add quota support for local ephemeral storage update the doc to this alpha feature * Update resource-quotas.md * Updated Deployments concepts doc (#5491) * Updated Deployments concepts doc * Addressed comments * Addressed more comments * Modify allocatable storage to ephemeral-storage (#5490) Update the doc to use ephemeral-storage instead of storage * Revamped concepts doc for ReplicaSet (#5463) * Revamped concepts doc for ReplicaSet * Minor changes to call out specific versions for selector defaulting and immutability * Addressed doc review comments * Remove petset documentations (#5395) * Update docs to use batch/v1beta1 cronjobs (#5475) * add federation job doc (#5485) * add federation job doc * Update job.md Edits for clarity and consistency * Update job.md Fixed a typo * update DaemonSet concept for 1.8 release (#5397) * update DaemonSet concept for 1.8 release * Update daemonset.md Fix typo. than -> then * Update bootstrap tokens doc for 1.8. (#5479) * Update bootstrap tokens doc for 1.8. This has some changes I missed when I was updating the main kubeadm documention: - Bootstrap tokens are now beta, not alpha (kubernetes/enhancements#130) - The apiserver flag to enable the authenticator changedin 1.8 (kubernetes/kubernetes#51198) - Added `auth-extra-groups` documentaion (kubernetes/kubernetes#50933) - Updated the _Token Management with `kubeadm`_ section to link to the main kubeadm docs, since it was just duplicated information. * Update bootstrap-tokens.md * Updated the Cassandra tutorial to use apps/v1beta2 (#5548) * add docs for AllowPrivilegeEscalation (#5448) Signed-off-by: Jess Frazelle <acidburn@microsoft.com> * Add local ephemeral storage alpha feature in managing compute resource (#5522) * Add local ephemeral storage alpha feature in managing compute resource Since 1.8, we add the local ephemeral storage alpha feature as one resource type to manage. Add this feature into the doc. * Update manage-compute-resources-container.md * Update manage-compute-resources-container.md * Update manage-compute-resources-container.md * Update manage-compute-resources-container.md * Update manage-compute-resources-container.md * Update manage-compute-resources-container.md * Added documentation for Metrics Server (#5560) * authorization: improve authorization debugging docs (#5549) * Document mount propagation (#5544) * Update /docs/setup/independent/create-cluster-kubeadm.md for 1.8. (#5524) This introduction needed a couple of small tweaks to cover the `--discovery-token-ca-cert-hash` flag added in kubernetes/kubernetes#49520 and some version bumps. * Add task doc for alpha dynamic kubelet configuration (#5523) * Fix input/output of selfsubjectaccess review (#5593) * Add docs for implementing resize (#5528) * Add docs for implementing resize * Update admission-controllers.md * Added link to PVC section * minor typo fixes * Update NetworkPolicy concept guide with egress and CIDR changes (#5529) * update zookeeper tutorial for 1.8 release * add doc for hostpath type (#5503) * Federated Hpa feature doc (#5487) * Federated Hpa feature doc * Federated Hpa feature doc review fixes * Update hpa.md * Update hpa.md * update cloud controller manager docs for v1.8 * Update cronjob with defaults information (#5556) * Kubernetes 1.8 reference docs (#5632) * Kubernetes 1.8 reference docs * Kubectl reference docs for 1.8 * Update side bar with 1.8 kubectl and api ref docs links * remove petset.md * update on state of HostAlias in 1.8 with hostNetwork Pod support (#5644) * Fix cron job deletion section (#5655) * update imported docs (#5656) * Add documentation for certificate rotation. (#5639) * Link to using kubeadm page * fix the command output fix the command output * fix typo in api/resources reference: "Worloads" * Add documentation for certificate rotation. * Create TOC entry for cloud controller manager. (#5662) * Updates for new versions of API types * Followup 5655: fix link to garbage collection (#5666) * Temporarily redirect resources-reference to api-reference. (#5668) * Update config for 1.8 release. (#5661) * Update config for 1.8 release. * Address reviewer comments. * Switch references in HPA docs from alpha to beta (#5671) The HPA docs still referenced the alpha version. This switches them to talk about v2beta1, which is the appropriate version for Kubernetes 1.8 * Deprecate openstack heat (#5670) * Fix typo in pod preset conflict example Move container port definition to the correct line. * Highlight openstack-heat provider deprecation The openstack-heat provider for kube-up is being deprecated and will be removed in a future release. * Temporarily fix broken links by redirecting. (#5672) * Fix broken links. (#5675) * Fix render of code block (#5674) * Fix broken links. (#5677) * Add a small note about auto-bootstrapped CSR ClusterRoles (#5660) * Update kubeadm install doc for v1.8 (#5676) * add draft workloads api content for 1.8 (#5650) * add draft workloads api content for 1.8 * edits per review, add tables, for 1.8 workloads api doc * fix typo * Minor fixes to kubeadm 1.8 upgrade guide. (#5678) - The kubelet upgrade instructions should be done on every host, not just worker nodes. - We should just upgrade all packages, instead of calling out kubelet specifically. This will also upgrade kubectl, kubeadm, and kubernetes-cni, if installed. - Draining nodes should also ignore daemonsets, and master errors can be ignored. - Make sure that the new kubeadm download is chmoded correctly. - Add a step to run `kubeadm version` to verify after downloading. - Manually approve new kubelet CSRs if rotation is enabled (known issue). * Release 1.8 (#5680) * Fix versions for 1.8 API ref docs * Updates for 1.8 kubectl reference docs * Kubeadm /docs/admin/kubeadm.md cleanup, editing. (#5681) * Update docs/admin/kubeadm.md (mostly 1.8 related). This is Fabrizio's work, which I'm committing along with my edits (in a commit on top of this). * A few of my own edits to clarify and clean up some Markdown.

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mattmoyer force-pushed the release-1.8-kubeadm-selfhosting branch from 623c94a to bb6d4c0 Compare September 16, 2017 21:08

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Update docs/admin/kubeadm.md to cover self-hosting in 1.8.

15d17ae

This is a new beta feature in 1.8.

mattmoyer force-pushed the release-1.8-kubeadm-selfhosting branch from a97bada to 15d17ae Compare September 19, 2017 01:11

mattmoyer mentioned this pull request Sep 19, 2017

Update /docs/setup/independent/create-cluster-kubeadm.md for 1.8. #5524

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steveperry-53 merged commit b3cf89c into kubernetes:release-1.8 Sep 19, 2017

mattmoyer deleted the release-1.8-kubeadm-selfhosting branch September 26, 2017 22:24

luxas mentioned this pull request Nov 29, 2017

Self-hosting support in kubeadm kubernetes/enhancements#415

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Update docs/admin/kubeadm.md to cover self-hosting in 1.8. #5497

Update docs/admin/kubeadm.md to cover self-hosting in 1.8. #5497

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Update docs/admin/kubeadm.md to cover self-hosting in 1.8. #5497

Update docs/admin/kubeadm.md to cover self-hosting in 1.8. #5497

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