\fB\fCendpoint\fR specifies the \fBURL\fP for a remote k8s API endpoint.
If omitted, it will connect to k8s in-cluster using the cluster service account.
.IP\(bu4
\fB\fCtls\fR\fBCERT\fP\fBKEY\fP\fBCACERT\fP are the TLS cert, key and the CA cert file names for remote k8s connection.
This option is ignored if connecting in-cluster (i.e. endpoint is not specified).
.IP\(bu4
\fB\fCkubeconfig\fR\fBKUBECONFIG\fP\fBCONTEXT\fP authenticates the connection to a remote k8s cluster using a kubeconfig file. It supports TLS, username and password, or token-based authentication. This option is ignored if connecting in-cluster (i.e., the endpoint is not specified).
.IP\(bu4
\fB\fCnamespaces\fR\fBNAMESPACE [NAMESPACE...]\fP only exposes the k8s namespaces listed.
If this option is omitted all namespaces are exposed
.IP\(bu4
\fB\fCnamespace_labels\fR\fBEXPRESSION\fP only expose the records for Kubernetes namespaces that match this label selector.
The label selector syntax is described in the
Kubernetes User Guide - Labels
\[la]http://kubernetes.io/docs/user-guide/labels/\[ra]. An example that
only exposes namespaces labeled as "istio-injection=enabled", would use:
\fB\fClabels istio-injection=enabled\fR.
.IP\(bu4
\fB\fClabels\fR\fBEXPRESSION\fP only exposes the records for Kubernetes objects that match this label selector.
The label selector syntax is described in the
Kubernetes User Guide - Labels
\[la]https://kubernetes.io/docs/user-guide/labels/\[ra]. An example that
only exposes objects labeled as "application=nginx" in the "staging" or "qa" environments, would
use: \fB\fClabels environment in (staging, qa),application=nginx\fR.
.IP\(bu4
\fB\fCpods\fR\fBPOD-MODE\fP sets the mode for handling IP-based pod A records, e.g.
\fB\fC1-2-3-4.ns.pod.cluster.local. in A 1.2.3.4\fR.
This option is provided to facilitate use of SSL certs when connecting directly to pods. Valid
values for \fBPOD-MODE\fP:
.RS
.IP\(en4
\fB\fCdisabled\fR: Default. Do not process pod requests, always returning \fB\fCNXDOMAIN\fR
.IP\(en4
\fB\fCinsecure\fR: Always return an A record with IP from request (without checking k8s). This option
is vulnerable to abuse if used maliciously in conjunction with wildcard SSL certs. This
option is provided for backward compatibility with kube-dns.
.IP\(en4
\fB\fCverified\fR: Return an A record if there exists a pod in same namespace with matching IP. This
option requires substantially more memory than in insecure mode, since it will maintain a watch
on all pods.
.RE
.IP\(bu4
\fB\fCendpoint_pod_names\fR uses the pod name of the pod targeted by the endpoint as
the endpoint name in A records, e.g.,
\fB\fCendpoint-name.my-service.namespace.svc.cluster.local. in A 1.2.3.4\fR
By default, the endpoint-name name selection is as follows: Use the hostname
of the endpoint, or if hostname is not set, use the dashed form of the endpoint
IP address (e.g., \fB\fC1-2-3-4.my-service.namespace.svc.cluster.local.\fR)
If this directive is included, then name selection for endpoints changes as
follows: Use the hostname of the endpoint, or if hostname is not set, use the
pod name of the pod targeted by the endpoint. If there is no pod targeted by
the endpoint, use the dashed IP address form.
.IP\(bu4
\fB\fCttl\fR allows you to set a custom TTL for responses. The default is 5 seconds. The minimum TTL allowed is
0 seconds, and the maximum is capped at 3600 seconds. Setting TTL to 0 will prevent records from being cached.
.IP\(bu4
\fB\fCnoendpoints\fR will turn off the serving of endpoint records by disabling the watch on endpoints.
All endpoint queries and headless service queries will result in an NXDOMAIN.
.IP\(bu4
\fB\fCtransfer\fR enables zone transfers. It may be specified multiples times. \fB\fCTo\fR signals the direction
(only \fB\fCto\fR is allowed). \fBADDRESS\fP must be denoted in CIDR notation (127.0.0.1/32 etc.) or just as
plain addresses. The special wildcard \fB\fC*\fR means: the entire internet.
Sending DNS notifies is not supported.
Deprecated
\[la]https://github.com/kubernetes/dns/blob/master/docs/specification.md#26---deprecated-records\[ra] pod records in the subdomain \fB\fCpod.cluster.local\fR are not transferred.
.IP\(bu4
\fB\fCfallthrough\fR\fB[ZONES...]\fP If a query for a record in the zones for which the plugin is authoritative
results in NXDOMAIN, normally that is what the response will be. However, if you specify this option,
the query will instead be passed on down the plugin chain, which can include another plugin to handle
the query. If \fB[ZONES...]\fP is omitted, then fallthrough happens for all zones for which the plugin
is authoritative. If specific zones are listed (for example \fB\fCin-addr.arpa\fR and \fB\fCip6.arpa\fR), then only
queries for those zones will be subject to fallthrough.
.IP\(bu4
\fB\fCignore empty_service\fR returns NXDOMAIN for services without any ready endpoint addresses (e.g., ready pods).
This allows the querying pod to continue searching for the service in the search path.
The search path could, for example, include another Kubernetes cluster.
multiple wildcards are allowed in a single query, e.g., \fB\fCA\fR Request \fB\fC*.*.svc.zone.\fR or \fB\fCSRV\fR request \fB\fC*.*.*.*.svc.zone.\fR
.PP
For example, wildcards can be used to resolve all Endpoints for a Service as \fB\fCA\fR records. e.g.: \fB\fC*.service.ns.svc.myzone.local\fR will return the Endpoint IPs in the Service \fB\fCservice\fR in namespace \fB\fCdefault\fR:
.PP
.RS
.nf
*.service.default.svc.cluster.local. 5 IN A 192.168.10.10
*.service.default.svc.cluster.local. 5 IN A 192.168.25.15
.fi
.RE
.PP
This response can be randomized using the \fB\fCloadbalance\fR plugin
