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Official 1.17 Release Docs (#18011)

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* feat: graduate TaintNodesByCondition to GA (#17073)

* Promote StartupProbe to beta (enabled by default). (#17164)

* Watch bookmarks to GA (#17026)

* feat: graduate ScheduleDaemonSetPods to GA (#17350)

* Update Docker installation instructions (#17405)

* Use exact version numbers for installing Docker in Ubuntu (#17428)

* Move CSIMigration and CSIMigrationGCE to Beta in Kubernetes v1.17 (#17478)

* Promote NodeLease feature to GA (#17189)

* Update docs for csi topology ga (#17408)

* Update RunAsUsername to beta (#17460)

* doc:Update RunAsUsername to beta

* doc: update samples - kubernetes.io/os is no longer beta

* Updating based on review feedback

* Promote Node-specific volume limits to GA (#17432)

* Promote PodShareProcessNamespace to stable (#17192)

* Promote PodShareProcessNamespace to stable

* Add for_k8s_version to feature-state label

Co-Authored-By: Tim Bannister <tim@scalefactory.com>

* Readd version-check to shareProcessNamespace task

* Update service load balancer finalizer doc for GA (#17438)

* Update Topology Manager docs (#17451)

* Added information on how device plugins can take advantage
of Topology Manager
* Updated the Topology Manager documentation to include additionalinformation and update some out of date sections

* Fix broken Topology Manager link (#17746)

Part of What's Next Device Plugin section

* Update CRD defaulting docs for GA (#17450)

* Add documentation for VolumeSnapshot Beta (#17233)

* Updating EndpointSlice documentation for beta release in 1.17 (#17411)

* (docs/dualstack): v1.17 updates (#17457)

* Add placehold doc updates for dualstack in 1.17

Signed-off-by: Lachlan Evenson <lachlan.evenson@microsoft.com>

* Add Downward API and /etc/hosts Pod IP validation

Signed-off-by: Lachlan Evenson <lachlan.evenson@microsoft.com>

* remove addressed known issue via k/k pr 85246

Signed-off-by: Lachlan Evenson <lachlan.evenson@microsoft.com>

* Remove known issue and add flag as part of k/k 79993

Signed-off-by: Lachlan Evenson <lachlan.evenson@microsoft.com>

* remove follow up placeholders

Signed-off-by: Lachlan Evenson <lachlan.evenson@microsoft.com>

* Update verbiage

Signed-off-by: Lachlan Evenson <lachlan.evenson@microsoft.com>

* Make IP addressing consistent throughout the task

Signed-off-by: Lachlan Evenson <lachlan.evenson@microsoft.com>

* Update to status.podIPs

Signed-off-by: Lachlan Evenson <lachlan.evenson@microsoft.com>

* Update content/en/docs/tasks/network/validate-dual-stack.md

Use set instead of env

Co-Authored-By: Khaled Henidak (Kal) <khnidk@outlook.com>

* add topology.kubernetes.io/zone, topology.kubernetes.io/region and node.kubernetes.io/instance-type labels to docs (#17498)

Signed-off-by: Andrew Sy Kim <kiman@vmware.com>

* Service topology alpha documentation (#17459)

* Update list of feature flags for in-tree plugins migrated to CSI (#17533)

Signed-off-by: Deep Debroy <ddebroy@docker.com>

* Update Node concept for TaintNodesByCondition going GA (#17577)

* feat: graduate ResourceQuotaScopeSelectors to GA in 1.17 (#17554)

* kubeadm: update the upgrade documentation for 1.17 (#17587)

* doc: Simplify Windows deployments with RuntimeClass (#16697)

* doc: Simplify Windows deployments with RuntimeClass

* Updating on review feedback

* doc: Adding windows-build label from enhancement 1301

* update doc for kubelet option --reserved-cpus (#17648)

* feat: update TaintNodesByCondition in feature gates table (#17377)

* Update docs for v1 resource quota configuration (#17547)

* AdmissionConfiguration v1 (#17548)

* Update WebhookAdmissionConfiguration examples (#17549)

* Update AWS EBS Migration Feature state (#16126)

* Add resource version section to api-concepts documentation (#16910)

* Add Resource Version semantics section to api concepts

* Clarify risks of going back in time, add details about compaction and watch cache sizes

* Apply suggestions from liggitt

Co-Authored-By: Jordan Liggitt <jordan@liggitt.net>

* remove pesudocode, apply feedback

* Fix typo

* Clarify equality rules

* Cleanup kubectl generators docs (#17609)

* Write ReplicationController without a space

* Drop mentioning unsupported cluster versions

* Fix capitalization for “API group”

* Tweak wording

* Avoid using deprecated generator in example

* add Antrea description in dev-1.17 (#17919)

* Promote VolumeSubpathEnvExpansion to GA

* Reference Documentation for the Kubernetes API for 1.17 (#18019)

* Update feature-gates.md (#18033)

* Reference Documentation for kubectl Commands for 1.17 (#18017)

* Update for v1.17 (#18034)

* Update config.toml(release-1.17) for 1.17 (#18031)
This commit is contained in:
Damini Satya
2019-12-10 05:41:29 +05:30
committed by Kubernetes Prow Robot
parent cf925bb688
commit dff2f7b960
63 changed files with 62955 additions and 443 deletions
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content/en/docs/concepts/architecture/nodes.md
+25 -24
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@@ -81,19 +81,10 @@ the `Terminating` or `Unknown` state. In cases where Kubernetes cannot deduce fr
permanently left a cluster, the cluster administrator may need to delete the node object by hand. Deleting the node object from
Kubernetes causes all the Pod objects running on the node to be deleted from the apiserver, and frees up their names.
In version 1.12, `TaintNodesByCondition` feature is promoted to beta, so node lifecycle controller automatically creates
The node lifecycle controller automatically creates
[taints](/docs/concepts/configuration/taint-and-toleration/) that represent conditions.
Similarly the scheduler ignores conditions when considering a Node; instead
it looks at the Node's taints and a Pod's tolerations.
Now users can choose between the old scheduling model and a new, more flexible scheduling model.
A Pod that does not have any tolerations gets scheduled according to the old model. But a Pod that
tolerates the taints of a particular Node can be scheduled on that Node.
{{< caution >}}
Enabling this feature creates a small delay between the
time when a condition is observed and when a taint is created. This delay is usually less than one second, but it can increase the number of Pods that are successfully scheduled but rejected by the kubelet.
{{< /caution >}}
When the scheduler is assigning a Pod to a Node, the scheduler takes the Node's taints
into account, except for any taints that the Pod tolerates.
### Capacity and Allocatable {#capacity}
@@ -172,18 +163,28 @@ to be unreachable. (The default timeouts are 40s to start reporting
ConditionUnknown and 5m after that to start evicting pods.) The node controller
checks the state of each node every `--node-monitor-period` seconds.
In versions of Kubernetes prior to 1.13, NodeStatus is the heartbeat from the
node. Node lease feature is enabled by default since 1.14 as a beta feature
(feature gate `NodeLease`, [KEP-0009](https://github.com/kubernetes/enhancements/blob/master/keps/sig-node/0009-node-heartbeat.md)).
When node lease feature is enabled, each node has an associated `Lease` object in
`kube-node-lease` namespace that is renewed by the node periodically, and both
NodeStatus and node lease are treated as heartbeats from the node. Node leases
are renewed frequently while NodeStatus is reported from node to master only
when there is some change or enough time has passed (default is 1 minute, which
is longer than the default timeout of 40 seconds for unreachable nodes). Since
node lease is much more lightweight than NodeStatus, this feature makes node
heartbeat significantly cheaper from both scalability and performance
perspectives.
#### Heartbeats
Heartbeats, sent by Kubernetes nodes, help determine the availability of a node.
There are two forms of heartbeats: updates of `NodeStatus` and the
[Lease object](/docs/reference/generated/kubernetes-api/{{< latest-version >}}/#lease-v1-coordination-k8s-io).
Each Node has an associated Lease object in the `kube-node-lease`
{{< glossary_tooltip term_id="namespace" text="namespace">}}.
Lease is a lightweight resource, which improves the performance
of the node heartbeats as the cluster scales.
The kubelet is responsible for creating and updating the `NodeStatus` and
a Lease object.
- The kubelet updates the `NodeStatus` either when there is change in status,
or if there has been no update for a configured interval. The default interval
for `NodeStatus` updates is 5 minutes (much longer than the 40 second default
timeout for unreachable nodes).
- The kubelet creates and then updates its Lease object every 10 seconds
(the default update interval). Lease updates occur independently from the
`NodeStatus` updates.
#### Reliability
In Kubernetes 1.4, we updated the logic of the node controller to better handle
cases when a large number of nodes have problems with reaching the master