Release 1.8 (#5659)
* 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 kubernetes/kubernetes.github.io/issues/4689 * adds kubeadm upgrade cmd to ToC addresses kubernetes/kubernetes.github.io/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 https://github.com/kubernetes/kubernetes.github.io/pull/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 (https://github.com/kubernetes/features/issues/130) - The apiserver flag to enable the authenticator changedin 1.8 (https://github.com/kubernetes/kubernetes/pull/51198) - Added `auth-extra-groups` documentaion (https://github.com/kubernetes/kubernetes/pull/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 https://github.com/kubernetes/kubernetes/pull/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.
This commit is contained in:
Steve Perry
@@ -1,6 +1,10 @@
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---
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approvers:
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- enisoc
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- erictune
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- foxish
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- janetkuo
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- kow3ns
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title: Daemon Sets
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---
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@@ -9,9 +13,9 @@ title: Daemon Sets
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## What is a DaemonSet?
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A _DaemonSet_ ensures that all (or some) nodes run a copy of a pod. As nodes are added to the
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cluster, pods are added to them. As nodes are removed from the cluster, those pods are garbage
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collected. Deleting a DaemonSet will clean up the pods it created.
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A _DaemonSet_ ensures that all (or some) Nodes run a copy of a Pod. As nodes are added to the
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cluster, Pods are added to them. As nodes are removed from the cluster, those Pods are garbage
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collected. Deleting a DaemonSet will clean up the Pods it created.
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Some typical uses of a DaemonSet are:
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@@ -47,20 +51,26 @@ A DaemonSet also needs a [`.spec`](https://git.k8s.io/community/contributors/dev
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### Pod Template
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The `.spec.template` is the only required field of the `.spec`.
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The `.spec.template` is one of the required fields in `.spec`.
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The `.spec.template` is a [pod template](/docs/concepts/workloads/pods/pod-overview/#pod-templates). It has exactly the same schema as a [pod](/docs/concepts/workloads/pods/pod/), except it is nested and does not have an `apiVersion` or `kind`.
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The `.spec.template` is a [pod template](/docs/concepts/workloads/pods/pod-overview/#pod-templates). It has exactly the same schema as a [Pod](/docs/concepts/workloads/pods/pod/), except it is nested and does not have an `apiVersion` or `kind`.
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In addition to required fields for a pod, a pod template in a DaemonSet has to specify appropriate
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In addition to required fields for a Pod, a Pod template in a DaemonSet has to specify appropriate
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labels (see [pod selector](#pod-selector)).
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A pod template in a DaemonSet must have a [`RestartPolicy`](/docs/user-guide/pod-states)
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A Pod Template in a DaemonSet must have a [`RestartPolicy`](/docs/user-guide/pod-states)
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equal to `Always`, or be unspecified, which defaults to `Always`.
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### Pod Selector
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The `.spec.selector` field is a pod selector. It works the same as the `.spec.selector` of
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a [Job](/docs/concepts/jobs/run-to-completion-finite-workloads/) or other new resources.
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a [Job](/docs/concepts/jobs/run-to-completion-finite-workloads/).
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As of Kubernetes 1.8, you must specify a pod selector that matches the labels of the
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`.spec.template`. The pod selector will no longer be defaulted when left empty. Selector
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defaulting was not compatible with `kubectl apply`. Also, once a DaemonSet is created,
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its `spec.selector` can not be mutated. Mutating the pod selector can lead to the
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unintentional orphaning of Pods, and it was found to be confusing to users.
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The `spec.selector` is an object consisting of two fields:
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@@ -73,53 +83,58 @@ When the two are specified the result is ANDed.
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If the `.spec.selector` is specified, it must match the `.spec.template.metadata.labels`. If not
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specified, they are defaulted to be equal. Config with these not matching will be rejected by the API.
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Also you should not normally create any pods whose labels match this selector, either directly, via
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another DaemonSet, or via other controller such as ReplicationController. Otherwise, the DaemonSet
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controller will think that those pods were created by it. Kubernetes will not stop you from doing
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this. One case where you might want to do this is manually create a pod with a different value on
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Also you should not normally create any Pods whose labels match this selector, either directly, via
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another DaemonSet, or via other controller such as ReplicaSet. Otherwise, the DaemonSet
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controller will think that those Pods were created by it. Kubernetes will not stop you from doing
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this. One case where you might want to do this is manually create a Pod with a different value on
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a node for testing.
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If you attempt to create a DaemonSet such that
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### Running Pods on Only Some Nodes
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If you specify a `.spec.template.spec.nodeSelector`, then the DaemonSet controller will
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create pods on nodes which match that [node
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create Pods on nodes which match that [node
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selector](/docs/concepts/configuration/assign-pod-node/). Likewise if you specify a `.spec.template.spec.affinity`,
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then DaemonSet controller will create pods on nodes which match that [node affinity](/docs/concepts/configuration/assign-pod-node/).
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If you do not specify either, then the DaemonSet controller will create pods on all nodes.
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then DaemonSet controller will create Pods on nodes which match that [node affinity](/docs/concepts/configuration/assign-pod-node/).
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If you do not specify either, then the DaemonSet controller will create Pods on all nodes.
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## How Daemon Pods are Scheduled
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Normally, the machine that a pod runs on is selected by the Kubernetes scheduler. However, pods
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created by the Daemon controller have the machine already selected (`.spec.nodeName` is specified
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when the pod is created, so it is ignored by the scheduler). Therefore:
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Normally, the machine that a Pod runs on is selected by the Kubernetes scheduler. However, Pods
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created by the DaemonSet controller have the machine already selected (`.spec.nodeName` is specified
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when the Pod is created, so it is ignored by the scheduler). Therefore:
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- The [`unschedulable`](/docs/admin/node/#manual-node-administration) field of a node is not respected
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by the DaemonSet controller.
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- DaemonSet controller can make pods even when the scheduler has not been started, which can help cluster
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- The DaemonSet controller can make Pods even when the scheduler has not been started, which can help cluster
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bootstrap.
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Daemon pods do respect [taints and tolerations](/docs/concepts/configuration/assign-pod-node/#taints-and-tolerations-beta-feature),
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Daemon Pods do respect [taints and tolerations](/docs/concepts/configuration/assign-pod-node/#taints-and-tolerations-beta-feature),
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but they are created with `NoExecute` tolerations for the following taints with no `tolerationSeconds`:
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- `node.alpha.kubernetes.io/notReady`
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- `node.alpha.kubernetes.io/unreachable`
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- `node.alpha.kubernetes.io/memoryPressure`
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- `node.alpha.kubernetes.io/diskPressure`
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When the support to critical pods is enabled and the pods in a DaemonSet are
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labelled as critical, the Daemon pods are created with an additional
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`NoExecute` toleration for the `node.alpha.kubernetes.io/outOfDisk` taint with
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no `tolerationSeconds`.
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This ensures that when the `TaintBasedEvictions` alpha feature is enabled,
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they will not be evicted when there are node problems such as a network partition. (When the
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`TaintBasedEvictions` feature is not enabled, they are also not evicted in these scenarios, but
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due to hard-coded behavior of the NodeController rather than due to tolerations).
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They also tolerate following `NoSchedule` taints:
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- `node.kubernetes.io/memory-pressure`
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- `node.kubernetes.io/disk-pressure`
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When the support to critical pods is enabled and the pods in a DaemonSet are
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labelled as critical, the Daemon pods are created with an additional
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`NoSchedule` toleration for the `node.kubernetes.io/out-of-disk` taint.
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Note that all above `NoSchedule` taints above are created only in version 1.8 or later if the alpha feature `TaintNodesByCondition` is enabled.
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## Communicating with Daemon Pods
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Some possible patterns for communicating with pods in a DaemonSet are:
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Some possible patterns for communicating with Pods in a DaemonSet are:
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- **Push**: Pods in the DaemonSet are configured to send updates to another service, such
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as a stats database. They do not have clients.
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@@ -127,24 +142,24 @@ Some possible patterns for communicating with pods in a DaemonSet are:
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- **DNS**: Create a [headless service](/docs/concepts/services-networking/service/#headless-services) with the same pod selector,
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and then discover DaemonSets using the `endpoints` resource or retrieve multiple A records from
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DNS.
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- **Service**: Create a service with the same pod selector, and use the service to reach a
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- **Service**: Create a service with the same Pod selector, and use the service to reach a
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daemon on a random node. (No way to reach specific node.)
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## Updating a DaemonSet
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If node labels are changed, the DaemonSet will promptly add pods to newly matching nodes and delete
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pods from newly not-matching nodes.
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If node labels are changed, the DaemonSet will promptly add Pods to newly matching nodes and delete
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Pods from newly not-matching nodes.
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You can modify the pods that a DaemonSet creates. However, pods do not allow all
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You can modify the Pods that a DaemonSet creates. However, Pods do not allow all
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fields to be updated. Also, the DaemonSet controller will use the original template the next
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time a node (even with the same name) is created.
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You can delete a DaemonSet. If you specify `--cascade=false` with `kubectl`, then the pods
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You can delete a DaemonSet. If you specify `--cascade=false` with `kubectl`, then the Pods
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will be left on the nodes. You can then create a new DaemonSet with a different template.
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the new DaemonSet with the different template will recognize all the existing pods as having
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matching labels. It will not modify or delete them despite a mismatch in the pod template.
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You will need to force new pod creation by deleting the pod or deleting the node.
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The new DaemonSet with the different template will recognize all the existing Pods as having
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matching labels. It will not modify or delete them despite a mismatch in the Pod template.
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You will need to force new Pod creation by deleting the Pod or deleting the node.
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In Kubernetes version 1.6 and later, you can [perform a rolling update](/docs/tasks/manage-daemon/update-daemon-set/) on a DaemonSet.
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@@ -159,35 +174,35 @@ It is certainly possible to run daemon processes by directly starting them on a
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running such processes via a DaemonSet:
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- Ability to monitor and manage logs for daemons in the same way as applications.
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- Same config language and tools (e.g. pod templates, `kubectl`) for daemons and applications.
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- Same config language and tools (e.g. Pod templates, `kubectl`) for daemons and applications.
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- Future versions of Kubernetes will likely support integration between DaemonSet-created
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pods and node upgrade workflows.
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Pods and node upgrade workflows.
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- Running daemons in containers with resource limits increases isolation between daemons from app
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containers. However, this can also be accomplished by running the daemons in a container but not in a pod
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containers. However, this can also be accomplished by running the daemons in a container but not in a Pod
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(e.g. start directly via Docker).
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### Bare Pods
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It is possible to create pods directly which specify a particular node to run on. However,
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a DaemonSet replaces pods that are deleted or terminated for any reason, such as in the case of
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It is possible to create Pods directly which specify a particular node to run on. However,
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a DaemonSet replaces Pods that are deleted or terminated for any reason, such as in the case of
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node failure or disruptive node maintenance, such as a kernel upgrade. For this reason, you should
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use a DaemonSet rather than creating individual pods.
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use a DaemonSet rather than creating individual Pods.
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### Static Pods
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It is possible to create pods by writing a file to a certain directory watched by Kubelet. These
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It is possible to create Pods by writing a file to a certain directory watched by Kubelet. These
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are called [static pods](/docs/concepts/cluster-administration/static-pod/).
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Unlike DaemonSet, static pods cannot be managed with kubectl
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or other Kubernetes API clients. Static pods do not depend on the apiserver, making them useful
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in cluster bootstrapping cases. Also, static pods may be deprecated in the future.
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Unlike DaemonSet, static Pods cannot be managed with kubectl
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or other Kubernetes API clients. Static Pods do not depend on the apiserver, making them useful
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in cluster bootstrapping cases. Also, static Pods may be deprecated in the future.
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### Replication Controller
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### Deployments
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DaemonSet are similar to [Replication Controllers](/docs/user-guide/replication-controller) in that
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they both create pods, and those pods have processes which are not expected to terminate (e.g. web servers,
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DaemonSets are similar to [Deployments](/docs/concepts/workloads/controllers/deployment.md) in that
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they both create Pods, and those Pods have processes which are not expected to terminate (e.g. web servers,
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storage servers).
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Use a replication controller for stateless services, like frontends, where scaling up and down the
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Use a Deployment for stateless services, like frontends, where scaling up and down the
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number of replicas and rolling out updates are more important than controlling exactly which host
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the pod runs on. Use a Daemon Controller when it is important that a copy of a pod always run on
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all or certain hosts, and when it needs to start before other pods.
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the Pod runs on. Use a DaemonSet when it is important that a copy of a Pod always run on
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all or certain hosts, and when it needs to start before other Pods.
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