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Sync between master and dev-1.18

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This PR contains sync up between master and dev-1.18 and also reolsved merge conflicts occured during previous sync during previous sync up caused due to missed adding tide-method merge

Signed-off-by: vineeth <vineethpothulapati@outlook.com>
This commit is contained in:
vineeth
2020-02-14 01:30:05 +05:30
parent 63f30b086a 669bf498a9
commit 9433b26564
37 changed files with 1287 additions and 433 deletions
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content/en/docs/concepts/_index.md
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@@ -24,9 +24,9 @@ Once you've set your desired state, the *Kubernetes Control Plane* makes the clu
* **[kubelet](/docs/admin/kubelet/)**, which communicates with the Kubernetes Master.
* **[kube-proxy](/docs/admin/kube-proxy/)**, a network proxy which reflects Kubernetes networking services on each node.
## Kubernetes Objects
## Kubernetes objects
Kubernetes contains a number of abstractions that represent the state of your system: deployed containerized applications and workloads, their associated network and disk resources, and other information about what your cluster is doing. These abstractions are represented by objects in the Kubernetes API. See [Understanding Kubernetes Objects](/docs/concepts/overview/working-with-objects/kubernetes-objects/) for more details.
Kubernetes contains a number of abstractions that represent the state of your system: deployed containerized applications and workloads, their associated network and disk resources, and other information about what your cluster is doing. These abstractions are represented by objects in the Kubernetes API. See [Understanding Kubernetes objects](/docs/concepts/overview/working-with-objects/kubernetes-objects/#kubernetes-objects) for more details.
The basic Kubernetes objects include:
@@ -35,7 +35,7 @@ The basic Kubernetes objects include:
* [Volume](/docs/concepts/storage/volumes/)
* [Namespace](/docs/concepts/overview/working-with-objects/namespaces/)
Kubernetes also contains higher-level abstractions that rely on [Controllers](/docs/concepts/architecture/controller/) to build upon the basic objects, and provide additional functionality and convenience features. These include:
Kubernetes also contains higher-level abstractions that rely on [controllers](/docs/concepts/architecture/controller/) to build upon the basic objects, and provide additional functionality and convenience features. These include:
* [Deployment](/docs/concepts/workloads/controllers/deployment/)
* [DaemonSet](/docs/concepts/workloads/controllers/daemonset/)
content/en/docs/concepts/architecture/controller.md
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@@ -26,7 +26,7 @@ closer to the desired state, by turning equipment on or off.
## Controller pattern
A controller tracks at least one Kubernetes resource type.
These [objects](/docs/concepts/overview/working-with-objects/kubernetes-objects/)
These [objects](/docs/concepts/overview/working-with-objects/kubernetes-objects/#kubernetes-objects)
have a spec field that represents the desired state. The
controller(s) for that resource are responsible for making the current
state come closer to that desired state.
content/en/docs/concepts/extend-kubernetes/api-extension/custom-resources.md
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@@ -37,7 +37,7 @@ On their own, custom resources simply let you store and retrieve structured data
When you combine a custom resource with a *custom controller*, custom resources
provide a true _declarative API_.
A [declarative API](/docs/concepts/overview/working-with-objects/kubernetes-objects/#understanding-kubernetes-objects)
A [declarative API](/docs/concepts/overview/kubernetes-api/)
allows you to _declare_ or specify the desired state of your resource and tries to
keep the current state of Kubernetes objects in sync with the desired state.
The controller interprets the structured data as a record of the user's
content/en/docs/concepts/overview/working-with-objects/kubernetes-objects.md
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@@ -12,9 +12,9 @@ This page explains how Kubernetes objects are represented in the Kubernetes API,
{{% /capture %}}
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## Understanding Kubernetes Objects
## Understanding Kubernetes objects {#kubernetes-objects}
*Kubernetes Objects* are persistent entities in the Kubernetes system. Kubernetes uses these entities to represent the state of your cluster. Specifically, they can describe:
*Kubernetes objects* are persistent entities in the Kubernetes system. Kubernetes uses these entities to represent the state of your cluster. Specifically, they can describe:
* What containerized applications are running (and on which nodes)
* The resources available to those applications
@@ -33,7 +33,7 @@ For example, a Kubernetes Deployment is an object that can represent an applicat
For more information on the object spec, status, and metadata, see the [Kubernetes API Conventions](https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md).
### Describing a Kubernetes Object
### Describing a Kubernetes object
When you create an object in Kubernetes, you must provide the object spec that describes its desired state, as well as some basic information about the object (such as a name). When you use the Kubernetes API to create the object (either directly or via `kubectl`), that API request must include that information as JSON in the request body. **Most often, you provide the information to `kubectl` in a .yaml file.** `kubectl` converts the information to JSON when making the API request.
@@ -51,7 +51,7 @@ kubectl apply -f https://k8s.io/examples/application/deployment.yaml --record
The output is similar to this:
```shell
```
deployment.apps/nginx-deployment created
```
@@ -65,14 +65,15 @@ In the `.yaml` file for the Kubernetes object you want to create, you'll need to
* `spec` - What state you desire for the object
The precise format of the object `spec` is different for every Kubernetes object, and contains nested fields specific to that object. The [Kubernetes API Reference](/docs/reference/generated/kubernetes-api/{{< param "version" >}}/) can help you find the spec format for all of the objects you can create using Kubernetes.
For example, the `spec` format for a `Pod` can be found
[here](/docs/reference/generated/kubernetes-api/{{< param "version" >}}/#podspec-v1-core),
and the `spec` format for a `Deployment` can be found
[here](/docs/reference/generated/kubernetes-api/{{< param "version" >}}/#deploymentspec-v1-apps).
For example, the `spec` format for a Pod can be found in
[PodSpec v1 core](/docs/reference/generated/kubernetes-api/{{< param "version" >}}/#podspec-v1-core),
and the `spec` format for a Deployment can be found
[DeploymentSpec v1 apps](/docs/reference/generated/kubernetes-api/{{< param "version" >}}/#deploymentspec-v1-apps).
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* [Kubernetes API overview](/docs/reference/using-api/api-overview/) explains some more API concepts
* Learn about the most important basic Kubernetes objects, such as [Pod](/docs/concepts/workloads/pods/pod-overview/).
* Learn about [controllers](/docs/concepts/architecture/controller/) in Kubernetes
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content/en/docs/concepts/overview/working-with-objects/labels.md
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@@ -72,7 +72,7 @@ spec:
image: nginx:1.7.9
ports:
- containerPort: 80
```
## Label selectors
@@ -92,7 +92,7 @@ them.
For some API types, such as ReplicaSets, the label selectors of two instances must not overlap within a namespace, or the controller can see that as conflicting instructions and fail to determine how many replicas should be present.
{{< /note >}}
{{< caution >}}
{{< caution >}}
For both equality-based and set-based conditions there is no logical _OR_ (`||`) operator. Ensure your filter statements are structured accordingly.
{{< /caution >}}
@@ -210,7 +210,7 @@ this selector (respectively in `json` or `yaml` format) is equivalent to `compon
#### Resources that support set-based requirements
Newer resources, such as [`Job`](/docs/concepts/jobs/run-to-completion-finite-workloads/), [`Deployment`](/docs/concepts/workloads/controllers/deployment/), [`Replica Set`](/docs/concepts/workloads/controllers/replicaset/), and [`Daemon Set`](/docs/concepts/workloads/controllers/daemonset/), support _set-based_ requirements as well.
Newer resources, such as [`Job`](/docs/concepts/workloads/controllers/jobs-run-to-completion/), [`Deployment`](/docs/concepts/workloads/controllers/deployment/), [`ReplicaSet`](/docs/concepts/workloads/controllers/replicaset/), and [`DaemonSet`](/docs/concepts/workloads/controllers/daemonset/), support _set-based_ requirements as well.
```yaml
selector:
content/en/docs/concepts/services-networking/dns-pod-service.md
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## Services
### A records
### A/AAAA records
"Normal" (not headless) Services are assigned a DNS A record for a name of the
form `my-svc.my-namespace.svc.cluster-domain.example`. This resolves to the cluster IP
"Normal" (not headless) Services are assigned a DNS A or AAAA record,
depending on the IP family of the service, for a name of the form
`my-svc.my-namespace.svc.cluster-domain.example`. This resolves to the cluster IP
of the Service.
"Headless" (without a cluster IP) Services are also assigned a DNS A record for
a name of the form `my-svc.my-namespace.svc.cluster-domain.example`. Unlike normal
"Headless" (without a cluster IP) Services are also assigned a DNS A or AAAA record,
depending on the IP family of the service, for a name of the form
`my-svc.my-namespace.svc.cluster-domain.example`. Unlike normal
Services, this resolves to the set of IPs of the pods selected by the Service.
Clients are expected to consume the set or else use standard round-robin
selection from the set.
@@ -128,22 +130,22 @@ spec:
```
If there exists a headless service in the same namespace as the pod and with
the same name as the subdomain, the cluster's KubeDNS Server also returns an A
the same name as the subdomain, the cluster's DNS Server also returns an A or AAAA
record for the Pod's fully qualified hostname.
For example, given a Pod with the hostname set to "`busybox-1`" and the subdomain set to
"`default-subdomain`", and a headless Service named "`default-subdomain`" in
the same namespace, the pod will see its own FQDN as
"`busybox-1.default-subdomain.my-namespace.svc.cluster-domain.example`". DNS serves an
A record at that name, pointing to the Pod's IP. Both pods "`busybox1`" and
"`busybox2`" can have their distinct A records.
A or AAAA record at that name, pointing to the Pod's IP. Both pods "`busybox1`" and
"`busybox2`" can have their distinct A or AAAA records.
The Endpoints object can specify the `hostname` for any endpoint addresses,
along with its IP.
{{< note >}}
Because A records are not created for Pod names, `hostname` is required for the Pod's A
Because A or AAAA records are not created for Pod names, `hostname` is required for the Pod's A or AAAA
record to be created. A Pod with no `hostname` but with `subdomain` will only create the
A record for the headless service (`default-subdomain.my-namespace.svc.cluster-domain.example`),
A or AAAA record for the headless service (`default-subdomain.my-namespace.svc.cluster-domain.example`),
pointing to the Pod's IP address. Also, Pod needs to become ready in order to have a
record unless `publishNotReadyAddresses=True` is set on the Service.
{{< /note >}}
content/en/docs/concepts/services-networking/ingress.md
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For clarity, this guide defines the following terms:
Node
: A worker machine in Kubernetes, part of a cluster.
Cluster
: A set of Nodes that run containerized applications managed by Kubernetes. For this example, and in most common Kubernetes deployments, nodes in the cluster are not part of the public internet.
Edge router
: A router that enforces the firewall policy for your cluster. This could be a gateway managed by a cloud provider or a physical piece of hardware.
Cluster network
: A set of links, logical or physical, that facilitate communication within a cluster according to the Kubernetes [networking model](/docs/concepts/cluster-administration/networking/).
Service
: A Kubernetes {{< glossary_tooltip term_id="service" >}} that identifies a set of Pods using {{< glossary_tooltip text="label" term_id="label" >}} selectors. Unless mentioned otherwise, Services are assumed to have virtual IPs only routable within the cluster network.
* Node: A worker machine in Kubernetes, part of a cluster.
* Cluster: A set of Nodes that run containerized applications managed by Kubernetes. For this example, and in most common Kubernetes deployments, nodes in the cluster are not part of the public internet.
* Edge router: A router that enforces the firewall policy for your cluster. This could be a gateway managed by a cloud provider or a physical piece of hardware.
* Cluster network: A set of links, logical or physical, that facilitate communication within a cluster according to the Kubernetes [networking model](/docs/concepts/cluster-administration/networking/).
* Service: A Kubernetes {{< glossary_tooltip term_id="service" >}} that identifies a set of Pods using {{< glossary_tooltip text="label" term_id="label" >}} selectors. Unless mentioned otherwise, Services are assumed to have virtual IPs only routable within the cluster network.
## What is Ingress?
Ingress exposes HTTP and HTTPS routes from outside the cluster to
[Ingress](/docs/reference/generated/kubernetes-api/{{< param "version" >}}/#ingress-v1beta1-networking-k8s-io) exposes HTTP and HTTPS routes from outside the cluster to
{{< link text="services" url="/docs/concepts/services-networking/service/" >}} within the cluster.
Traffic routing is controlled by rules defined on the Ingress resource.
@@ -474,6 +465,7 @@ You can expose a Service in multiple ways that don't directly involve the Ingres
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* Learn about [ingress controllers](/docs/concepts/services-networking/ingress-controllers/)
* Learn about the [Ingress API](/docs/reference/generated/kubernetes-api/{{< param "version" >}}/#ingress-v1beta1-networking-k8s-io)
* Learn about [Ingress Controllers](/docs/concepts/services-networking/ingress-controllers/)
* [Set up Ingress on Minikube with the NGINX Controller](/docs/tasks/access-application-cluster/ingress-minikube)
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content/en/docs/concepts/services-networking/network-policies.md
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@@ -199,7 +199,7 @@ If you want to allow all traffic from all pods in a namespace (even if policies
You can create a "default" policy for a namespace which prevents all ingress AND egress traffic by creating the following NetworkPolicy in that namespace.
{{< codenew file="service/networking/network-policy-default-deny-egress.yaml" >}}
{{< codenew file="service/networking/network-policy-default-deny-all.yaml" >}}
This ensures that even pods that aren't selected by any other NetworkPolicy will not be allowed ingress or egress traffic.
@@ -207,7 +207,7 @@ This ensures that even pods that aren't selected by any other NetworkPolicy will
{{< feature-state for_k8s_version="v1.12" state="alpha" >}}
To use this feature, you (or your cluster administrator) will need to enable the `SCTPSupport` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/) for the API server with `--feature-gates=SCTPSupport=true,…`.
To use this feature, you (or your cluster administrator) will need to enable the `SCTPSupport` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/) for the API server with `--feature-gates=SCTPSupport=true,…`.
When the feature gate is enabled, you can set the `protocol` field of a NetworkPolicy to `SCTP`.
{{< note >}}