EndpointSlice

EndpointSlice represents a set of service endpoints. Most EndpointSlices are created by the EndpointSlice controller to represent the Pods selected by Service objects. For a given service there may be multiple EndpointSlice objects which must be joined to produce the full set of endpoints; you can find all of the slices for a given service by listing EndpointSlices in the service's namespace whose kubernetes.io/service-name label contains the service's name.

Concept documentation for EndpointSlice

EndpointSlices

The EndpointSlice API is the mechanism that Kubernetes uses to let your Service scale to handle large numbers of backends, and allows the cluster to update its list of healthy backends efficiently.
1. EndpointSlice API
2. What's next

apiVersion: discovery.k8s.io/v1

import "k8s.io/api/discovery/v1"

EndpointSlice

Field	Description
`addressType` * string	addressType specifies the type of address carried by this EndpointSlice. All addresses in this slice must be the same type. This field is immutable after creation. The following address types are currently supported: * IPv4: Represents an IPv4 Address. * IPv6: Represents an IPv6 Address. * FQDN: Represents a Fully Qualified Domain Name. (Deprecated) The EndpointSlice controller only generates, and kube-proxy only processes, slices of addressType "IPv4" and "IPv6". No semantics are defined for the "FQDN" type. Possible enum values: - `"FQDN"` represents a FQDN. - `"IPv4"` represents an IPv4 Address. - `"IPv6"` represents an IPv6 Address.
`apiVersion` string	APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
`endpoints` Endpoint array	endpoints is a list of unique endpoints in this slice. Each slice may include a maximum of 1000 endpoints.
`kind` string	Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
`metadata` ObjectMeta	Standard object's metadata.
`ports` EndpointPort array	ports specifies the list of network ports exposed by each endpoint in this slice. Each port must have a unique name. Each slice may include a maximum of 100 ports. Services always have at least 1 port, so EndpointSlices generated by the EndpointSlice controller will likewise always have at least 1 port. EndpointSlices used for other purposes may have an empty ports list.

EndpointSliceList

EndpointSliceList represents a list of endpoint slices

Field	Description
`apiVersion` string	APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
`items` * EndpointSlice array	items is the list of endpoint slices
`kind` string	Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
`metadata` ListMeta	Standard list metadata.

Endpoint

Endpoint represents a single logical "backend" implementing a service.

Field	Description
`addresses` * string array	addresses of this endpoint. For EndpointSlices of addressType "IPv4" or "IPv6", the values are IP addresses in canonical form. The syntax and semantics of other addressType values are not defined. This must contain at least one address but no more than 100. EndpointSlices generated by the EndpointSlice controller will always have exactly 1 address. No semantics are defined for additional addresses beyond the first, and kube-proxy does not look at them.
`conditions` EndpointConditions	conditions contains information about the current status of the endpoint.
`deprecatedTopology` object	deprecatedTopology contains topology information part of the v1beta1 API. This field is deprecated, and will be removed when the v1beta1 API is removed (no sooner than kubernetes v1.24). While this field can hold values, it is not writable through the v1 API, and any attempts to write to it will be silently ignored. Topology information can be found in the zone and nodeName fields instead.
`hints` EndpointHints	hints contains information associated with how an endpoint should be consumed.
`hostname` string	hostname of this endpoint. This field may be used by consumers of endpoints to distinguish endpoints from each other (e.g. in DNS names). Multiple endpoints which use the same hostname should be considered fungible (e.g. multiple A values in DNS). Must be lowercase and pass DNS Label (RFC 1123) validation.
`nodeName` string	nodeName represents the name of the Node hosting this endpoint. This can be used to determine endpoints local to a Node.
`targetRef` ObjectReference	targetRef is a reference to a Kubernetes object that represents this endpoint.
`zone` string	zone is the name of the Zone this endpoint exists in.

EndpointConditions

EndpointConditions represents the current condition of an endpoint.

Field	Description
`ready` boolean	ready indicates that this endpoint is ready to receive traffic, according to whatever system is managing the endpoint. A nil value should be interpreted as "true". In general, an endpoint should be marked ready if it is serving and not terminating, though this can be overridden in some cases, such as when the associated Service has set the publishNotReadyAddresses flag.
`serving` boolean	serving indicates that this endpoint is able to receive traffic, according to whatever system is managing the endpoint. For endpoints backed by pods, the EndpointSlice controller will mark the endpoint as serving if the pod's Ready condition is True. A nil value should be interpreted as "true".
`terminating` boolean	terminating indicates that this endpoint is terminating. A nil value should be interpreted as "false".

EndpointHints

EndpointHints provides hints describing how an endpoint should be consumed.

Field	Description
`forNodes` ForNode array	forNodes indicates the node(s) this endpoint should be consumed by when using topology aware routing. May contain a maximum of 8 entries.
`forZones` ForZone array	forZones indicates the zone(s) this endpoint should be consumed by when using topology aware routing. May contain a maximum of 8 entries.

EndpointPort

EndpointPort represents a Port used by an EndpointSlice

Field	Description
`appProtocol` string	The application protocol for this port. This is used as a hint for implementations to offer richer behavior for protocols that they understand. This field follows standard Kubernetes label syntax. Valid values are either: * Un-prefixed protocol names - reserved for IANA standard service names (as per RFC-6335 and https://www.iana.org/assignments/service-names). * Kubernetes-defined prefixed names: * 'kubernetes.io/h2c' - HTTP/2 prior knowledge over cleartext as described in https://www.rfc-editor.org/rfc/rfc9113.html#name-starting-http-2-with-prior- * 'kubernetes.io/ws' - WebSocket over cleartext as described in https://www.rfc-editor.org/rfc/rfc6455 * 'kubernetes.io/wss' - WebSocket over TLS as described in https://www.rfc-editor.org/rfc/rfc6455 * Other protocols should use implementation-defined prefixed names such as mycompany.com/my-custom-protocol.
`name` string	name represents the name of this port. All ports in an EndpointSlice must have a unique name. If the EndpointSlice is derived from a Kubernetes service, this corresponds to the Service.ports[].name. Name must either be an empty string or pass DNS_LABEL validation: * must be no more than 63 characters long. * must consist of lower case alphanumeric characters or '-'. * must start and end with an alphanumeric character. Default is empty string.
`port` integer	port represents the port number of the endpoint. If the EndpointSlice is derived from a Kubernetes service, this must be set to the service's target port. EndpointSlices used for other purposes may have a nil port.
`protocol` string	protocol represents the IP protocol for this port. Must be UDP, TCP, or SCTP. Default is TCP. Possible enum values: - `"SCTP"` is the SCTP protocol. - `"TCP"` is the TCP protocol. - `"UDP"` is the UDP protocol.

ForNode

ForNode provides information about which nodes should consume this endpoint.

Field	Description
`name` * string	name represents the name of the node.

ForZone

ForZone provides information about which zones should consume this endpoint.

Field	Description
`name` * string	name represents the name of the zone.

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https://kubernetes.io/docs/reference/kubernetes-api/discovery/endpoint-slice-v1/