Route configuration

Creating an HTTP-based route

A route allows you to host your application at a public URL. It can either be secure or unsecured, depending on the network security configuration of your application. An HTTP-based route is an unsecured route that uses the basic HTTP routing protocol and exposes a service on an unsecured application port.

The following procedure describes how to create a simple HTTP-based route to a web application, using the hello-openshift application as an example.

Prerequisites

• You installed the OpenShift CLI (oc).

• You are logged in as an administrator.

• You have a web application that exposes a port and a TCP endpoint listening for traffic on the port.

Procedure

1. Create a project called hello-openshift by running the following command:

   $ oc new-project hello-openshift

2. Create a pod in the project by running the following command:

   $ oc create -f https://raw.githubusercontent.com/openshift/origin/master/examples/hello-openshift/hello-pod.json

3. Create a service called hello-openshift by running the following command:

   $ oc expose pod/hello-openshift

4. Create an unsecured route to the hello-openshift application by running the following command:

   $ oc expose svc hello-openshift

   If you examine the resulting Route resource, it should look similar to the following:

   YAML definition of the created unsecured route:

   apiVersion: route.openshift.io/v1
   kind: Route
   metadata:
     name: hello-openshift
   spec:
     host: hello-openshift-hello-openshift.<Ingress_Domain> (1)
     port:
       targetPort: 8080
     to:
       kind: Service
       name: hello-openshift

   1	<Ingress_Domain> is the default ingress domain name.

   To display your default ingress domain, run the following command: $ oc get ingresses.config/cluster -o jsonpath={.spec.domain}

Creating a route for Ingress Controller sharding

A route allows you to host your application at a URL. In this case, the hostname is not set and the route uses a subdomain instead. When you specify a subdomain, you automatically use the domain of the Ingress Controller that exposes the route. For situations where a route is exposed by multiple Ingress Controllers, the route is hosted at multiple URLs.

The following procedure describes how to create a route for Ingress Controller sharding, using the hello-openshift application as an example.

Ingress Controller sharding is useful when balancing incoming traffic load among a set of Ingress Controllers and when isolating traffic to a specific Ingress Controller. For example, company A goes to one Ingress Controller and company B to another.

Prerequisites

• You installed the OpenShift CLI (oc).

• You are logged in as a project administrator.

• You have a web application that exposes a port and an HTTP or TLS endpoint listening for traffic on the port.

• You have configured the Ingress Controller for sharding.

Procedure

1. Create a project called hello-openshift by running the following command:

   $ oc new-project hello-openshift

2. Create a pod in the project by running the following command:

   $ oc create -f https://raw.githubusercontent.com/openshift/origin/master/examples/hello-openshift/hello-pod.json

3. Create a service called hello-openshift by running the following command:

   $ oc expose pod/hello-openshift

4. Create a route definition called hello-openshift-route.yaml:

   YAML definition of the created route for sharding:

   apiVersion: route.openshift.io/v1
   kind: Route
   metadata:
     labels:
       type: sharded (1)
     name: hello-openshift-edge
     namespace: hello-openshift
   spec:
     subdomain: hello-openshift (2)
     tls:
       termination: edge
     to:
       kind: Service
       name: hello-openshift

   1	Both the label key and its corresponding label value must match the ones specified in the Ingress Controller. In this example, the Ingress Controller has the label key and value type: sharded.
   2	The route will be exposed using the value of the subdomain field. When you specify the subdomain field, you must leave the hostname unset. If you specify both the host and subdomain fields, then the route will use the value of the host field, and ignore the subdomain field.

5. Use hello-openshift-route.yaml to create a route to the hello-openshift application by running the following command:

   $ oc -n hello-openshift create -f hello-openshift-route.yaml

Verification

• Get the status of the route with the following command:

  $ oc -n hello-openshift get routes/hello-openshift-edge -o yaml

  The resulting Route resource should look similar to the following:

  Example output

  apiVersion: route.openshift.io/v1
  kind: Route
  metadata:
    labels:
      type: sharded
    name: hello-openshift-edge
    namespace: hello-openshift
  spec:
    subdomain: hello-openshift
    tls:
      termination: edge
    to:
      kind: Service
      name: hello-openshift
  status:
    ingress:
    - host: hello-openshift.<apps-sharded.basedomain.example.net> (1)
      routerCanonicalHostname: router-sharded.<apps-sharded.basedomain.example.net> (2)
      routerName: sharded (3)

  1	The hostname the Ingress Controller, or router, uses to expose the route. The value of the host field is automatically determined by the Ingress Controller, and uses its domain. In this example, the domain of the Ingress Controller is <apps-sharded.basedomain.example.net>.
  2	The hostname of the Ingress Controller.
  3	The name of the Ingress Controller. In this example, the Ingress Controller has the name sharded.

Configuring route timeouts

You can configure the default timeouts for an existing route when you have services in need of a low timeout, which is required for Service Level Availability (SLA) purposes, or a high timeout, for cases with a slow back end.

Prerequisites

• You need a deployed Ingress Controller on a running cluster.

Procedure

1. Using the oc annotate command, add the timeout to the route:

   $ oc annotate route <route_name> \
       --overwrite haproxy.router.openshift.io/timeout=<timeout><time_unit> (1)

   1	Supported time units are microseconds (us), milliseconds (ms), seconds (s), minutes (m), hours (h), or days (d).

   The following example sets a timeout of two seconds on a route named myroute:

   $ oc annotate route myroute --overwrite haproxy.router.openshift.io/timeout=2s

HTTP Strict Transport Security

HTTP Strict Transport Security (HSTS) policy is a security enhancement, which signals to the browser client that only HTTPS traffic is allowed on the route host. HSTS also optimizes web traffic by signaling HTTPS transport is required, without using HTTP redirects. HSTS is useful for speeding up interactions with websites.

When HSTS policy is enforced, HSTS adds a Strict Transport Security header to HTTP and HTTPS responses from the site. You can use the insecureEdgeTerminationPolicy value in a route to redirect HTTP to HTTPS. When HSTS is enforced, the client changes all requests from the HTTP URL to HTTPS before the request is sent, eliminating the need for a redirect.

Cluster administrators can configure HSTS to do the following:

• Enable HSTS per-route

• Disable HSTS per-route

• Enforce HSTS per-domain, for a set of domains, or use namespace labels in combination with domains

Enabling HTTP Strict Transport Security per-route

HTTP strict transport security (HSTS) is implemented in the HAProxy template and applied to edge and re-encrypt routes that have the haproxy.router.openshift.io/hsts_header annotation.

Prerequisites

• You are logged in to the cluster with a user with administrator privileges for the project.

• You installed the oc CLI.

Procedure

• To enable HSTS on a route, add the haproxy.router.openshift.io/hsts_header value to the edge-terminated or re-encrypt route:

  Example route configured with an annotation

  apiVersion: route.openshift.io/v1
  kind: Route
  metadata:
    annotations:
      haproxy.router.openshift.io/hsts_header: max-age=31536000;includeSubDomains;preload   (1) (2) (3)
  ...
  spec:
    host: def.abc.com
    tls:
      termination: "reencrypt"
      ...
    wildcardPolicy: "Subdomain"

  1	Required. max-age measures the length of time, in seconds, that the HSTS policy is in effect. If set to 0, it negates the policy.
  2	Optional. When included, includeSubDomains tells the client that all subdomains of the host must have the same HSTS policy as the host.
  3	Optional. When max-age is greater than 0, you can add preload in haproxy.router.openshift.io/hsts_header to allow external services to include this site in their HSTS preload lists. For example, sites such as Google can construct a list of sites that have preload set. Browsers can then use these lists to determine which sites they can communicate with over HTTPS, even before they have interacted with the site. Without preload set, browsers must have interacted with the site over HTTPS, at least once, to get the header.

Disabling HTTP Strict Transport Security per-route

To disable HTTP strict transport security (HSTS) per-route, you can set the max-age value in the route annotation to 0.

Prerequisites

• You are logged in to the cluster with a user with administrator privileges for the project.

• You installed the oc CLI.

Procedure

• To disable HSTS, set the max-age value in the route annotation to 0, by entering the following command:

  $ oc annotate route <rout_name> -n <namespace> --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=0"

  You can alternatively apply the following YAML to create the config map: Example of disabling HSTS per-route metadata: annotations: haproxy.router.openshift.io/hsts_header: max-age=0

• To disable HSTS for every route in a namespace, enter the followinf command:

  $ oc annotate <route> --all -n <namespace> --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=0"

Verification

1. To query the annotation for all routes, enter the following command:

   $ oc get route  --all-namespaces -o go-template='{{range .items}}{{if .metadata.annotations}}{{$a := index .metadata.annotations "haproxy.router.openshift.io/hsts_header"}}{{$n := .metadata.name}}{{with $a}}Name: {{$n}} HSTS: {{$a}}{{"\n"}}{{else}}{{""}}{{end}}{{end}}{{end}}'

   Example output

   Name: routename HSTS: max-age=0

Enforcing HTTP Strict Transport Security per-domain

To enforce HTTP Strict Transport Security (HSTS) per-domain for secure routes, add a requiredHSTSPolicies record to the Ingress spec to capture the configuration of the HSTS policy.

If you configure a requiredHSTSPolicy to enforce HSTS, then any newly created route must be configured with a compliant HSTS policy annotation.

Prerequisites

• You are logged in to the cluster with a user with administrator privileges for the project.

• You installed the oc CLI.

Procedure

1. Edit the Ingress config file:

   $ oc edit ingresses.config.openshift.io/cluster

   Example HSTS policy

   apiVersion: config.openshift.io/v1
   kind: Ingress
   metadata:
     name: cluster
   spec:
     domain: 'hello-openshift-default.apps.username.devcluster.openshift.com'
     requiredHSTSPolicies: (1)
     - domainPatterns: (2)
       - '*hello-openshift-default.apps.username.devcluster.openshift.com'
       - '*hello-openshift-default2.apps.username.devcluster.openshift.com'
       namespaceSelector: (3)
         matchLabels:
           myPolicy: strict
       maxAge: (4)
         smallestMaxAge: 1
         largestMaxAge: 31536000
       preloadPolicy: RequirePreload (5)
       includeSubDomainsPolicy: RequireIncludeSubDomains (6)
     - domainPatterns: (2)
       - 'abc.example.com'
       - '*xyz.example.com'
       namespaceSelector:
         matchLabels: {}
       maxAge: {}
       preloadPolicy: NoOpinion
       includeSubDomainsPolicy: RequireNoIncludeSubDomains

   1	Required. requiredHSTSPolicies are validated in order, and the first matching domainPatterns applies.
   2	Required. You must specify at least one domainPatterns hostname. Any number of domains can be listed. You can include multiple sections of enforcing options for different domainPatterns.
   3	Optional. If you include namespaceSelector, it must match the labels of the project where the routes reside, to enforce the set HSTS policy on the routes. Routes that only match the namespaceSelector and not the domainPatterns are not validated.
   4	Required. max-age measures the length of time, in seconds, that the HSTS policy is in effect. This policy setting allows for a smallest and largest max-age to be enforced. The largestMaxAge value must be between 0 and 2147483647. It can be left unspecified, which means no upper limit is enforced. The smallestMaxAge value must be between 0 and 2147483647. Enter 0 to disable HSTS for troubleshooting, otherwise enter 1 if you never want HSTS to be disabled. It can be left unspecified, which means no lower limit is enforced.
   5	Optional. Including preload in haproxy.router.openshift.io/hsts_header allows external services to include this site in their HSTS preload lists. Browsers can then use these lists to determine which sites they can communicate with over HTTPS, before they have interacted with the site. Without preload set, browsers need to interact at least once with the site to get the header. preload can be set with one of the following: RequirePreload: preload is required by the RequiredHSTSPolicy. RequireNoPreload: preload is forbidden by the RequiredHSTSPolicy. NoOpinion: preload does not matter to the RequiredHSTSPolicy.
   6	Optional. includeSubDomainsPolicy can be set with one of the following: RequireIncludeSubDomains: includeSubDomains is required by the RequiredHSTSPolicy. RequireNoIncludeSubDomains: includeSubDomains is forbidden by the RequiredHSTSPolicy. NoOpinion: includeSubDomains does not matter to the RequiredHSTSPolicy.

2. You can apply HSTS to all routes in the cluster or in a particular namespace by entering the oc annotate command.

   • To apply HSTS to all routes in the cluster, enter the oc annotate command. For example:

     $ oc annotate route --all --all-namespaces --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=31536000"

   • To apply HSTS to all routes in a particular namespace, enter the oc annotate command. For example:

     $ oc annotate route --all -n my-namespace --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=31536000"

Verification

You can review the HSTS policy you configured. For example:

• To review the maxAge set for required HSTS policies, enter the following command:

  $ oc get clusteroperator/ingress -n openshift-ingress-operator -o jsonpath='{range .spec.requiredHSTSPolicies[*]}{.spec.requiredHSTSPolicies.maxAgePolicy.largestMaxAge}{"\n"}{end}'

• To review the HSTS annotations on all routes, enter the following command:

  $ oc get route  --all-namespaces -o go-template='{{range .items}}{{if .metadata.annotations}}{{$a := index .metadata.annotations "haproxy.router.openshift.io/hsts_header"}}{{$n := .metadata.name}}{{with $a}}Name: {{$n}} HSTS: {{$a}}{{"\n"}}{{else}}{{""}}{{end}}{{end}}{{end}}'

  Example output

  Name: <_routename_> HSTS: max-age=31536000;preload;includeSubDomains

Throughput issue troubleshooting methods

Sometimes applications deployed by using OKD can cause network throughput issues, such as unusually high latency between specific services.

If pod logs do not reveal any cause of the problem, use the following methods to analyze performance issues:

• Use a packet analyzer, such as ping or tcpdump to analyze traffic between a pod and its node.

  For example, run the tcpdump tool on each pod while reproducing the behavior that led to the issue. Review the captures on both sides to compare send and receive timestamps to analyze the latency of traffic to and from a pod. Latency can occur in OKD if a node interface is overloaded with traffic from other pods, storage devices, or the data plane.

  $ tcpdump -s 0 -i any -w /tmp/dump.pcap host <podip 1> && host <podip 2> (1)

  1	podip is the IP address for the pod. Run the oc get pod <pod_name> -o wide command to get the IP address of a pod.

  The tcpdump command generates a file at /tmp/dump.pcap containing all traffic between these two pods. You can run the analyzer shortly before the issue is reproduced and stop the analyzer shortly after the issue is finished reproducing to minimize the size of the file. You can also run a packet analyzer between the nodes (eliminating the SDN from the equation) with:

  $ tcpdump -s 0 -i any -w /tmp/dump.pcap port 4789

• Use a bandwidth measuring tool, such as iperf, to measure streaming throughput and UDP throughput. Locate any bottlenecks by running the tool from the pods first, and then running it from the nodes.

• In some cases, the cluster may mark the node with the router pod as unhealthy due to latency issues. Use worker latency profiles to adjust the frequency that the cluster waits for a status update from the node before taking action.

• If your cluster has designated lower-latency and higher-latency nodes, configure the spec.nodePlacement field in the Ingress Controller to control the placement of the router pod.

Additional resources

• Latency spikes or temporary reduction in throughput to remote workers

• Ingress Controller configuration parameters

Using cookies to keep route statefulness

OKD provides sticky sessions, which enables stateful application traffic by ensuring all traffic hits the same endpoint. However, if the endpoint pod terminates, whether through restart, scaling, or a change in configuration, this statefulness can disappear.

OKD can use cookies to configure session persistence. The Ingress controller selects an endpoint to handle any user requests, and creates a cookie for the session. The cookie is passed back in the response to the request and the user sends the cookie back with the next request in the session. The cookie tells the Ingress Controller which endpoint is handling the session, ensuring that client requests use the cookie so that they are routed to the same pod.

Annotating a route with a cookie

You can set a cookie name to overwrite the default, auto-generated one for the route. This allows the application receiving route traffic to know the cookie name. By deleting the cookie it can force the next request to re-choose an endpoint. So, if a server was overloaded it tries to remove the requests from the client and redistribute them.

Procedure

1. Annotate the route with the specified cookie name:

   $ oc annotate route <route_name> router.openshift.io/cookie_name="<cookie_name>"

   where:

   <route_name>

   Specifies the name of the route.

   <cookie_name>

   Specifies the name for the cookie.

   For example, to annotate the route my_route with the cookie name my_cookie:

   $ oc annotate route my_route router.openshift.io/cookie_name="my_cookie"

2. Capture the route hostname in a variable:

   $ ROUTE_NAME=$(oc get route <route_name> -o jsonpath='{.spec.host}')

   where:

   <route_name>

   Specifies the name of the route.

3. Save the cookie, and then access the route:

   $ curl $ROUTE_NAME -k -c /tmp/cookie_jar

   Use the cookie saved by the previous command when connecting to the route:

   $ curl $ROUTE_NAME -k -b /tmp/cookie_jar

Path-based routes

Path-based routes specify a path component that can be compared against a URL, which requires that the traffic for the route be HTTP based. Thus, multiple routes can be served using the same hostname, each with a different path. Routers should match routes based on the most specific path to the least. However, this depends on the router implementation.

The following table shows example routes and their accessibility:

An unsecured route with a path

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  name: route-unsecured
spec:
  host: www.example.com
  path: "/test" (1)
  to:
    kind: Service
    name: service-name

Route-specific annotations

The Ingress Controller can set the default options for all the routes it exposes. An individual route can override some of these defaults by providing specific configurations in its annotations. Red Hat does not support adding a route annotation to an operator-managed route.

Router timeout variables

TimeUnits are represented by a number followed by the unit: us *(microseconds), ms (milliseconds, default), s (seconds), m (minutes), h *(hours), d (days).

The regular expression is: [1-9][0-9]*(us\|ms\|s\|m\|h\|d).

A route setting custom timeout

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  annotations:
    haproxy.router.openshift.io/timeout: 5500ms (1)
...

A route that allows only one specific IP address

metadata:
  annotations:
    haproxy.router.openshift.io/ip_whitelist: 192.168.1.10

A route that allows several IP addresses

metadata:
  annotations:
    haproxy.router.openshift.io/ip_whitelist: 192.168.1.10 192.168.1.11 192.168.1.12

A route that allows an IP address CIDR network

metadata:
  annotations:
    haproxy.router.openshift.io/ip_whitelist: 192.168.1.0/24

A route that allows both IP an address and IP address CIDR networks

metadata:
  annotations:
    haproxy.router.openshift.io/ip_whitelist: 180.5.61.153 192.168.1.0/24 10.0.0.0/8

A route specifying a rewrite target

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  annotations:
    haproxy.router.openshift.io/rewrite-target: / (1)
...

Setting the haproxy.router.openshift.io/rewrite-target annotation on a route specifies that the Ingress Controller should rewrite paths in HTTP requests using this route before forwarding the requests to the backend application. The part of the request path that matches the path specified in spec.path is replaced with the rewrite target specified in the annotation.

The following table provides examples of the path rewriting behavior for various combinations of spec.path, request path, and rewrite target.

Configuring the route admission policy

Administrators and application developers can run applications in multiple namespaces with the same domain name. This is for organizations where multiple teams develop microservices that are exposed on the same hostname.

Prerequisites

• Cluster administrator privileges.

Procedure

• Edit the .spec.routeAdmission field of the ingresscontroller resource variable using the following command:

  $ oc -n openshift-ingress-operator patch ingresscontroller/default --patch '{"spec":{"routeAdmission":{"namespaceOwnership":"InterNamespaceAllowed"}}}' --type=merge

  Sample Ingress Controller configuration

  spec:
    routeAdmission:
      namespaceOwnership: InterNamespaceAllowed
  ...

  You can alternatively apply the following YAML to configure the route admission policy: apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: default namespace: openshift-ingress-operator spec: routeAdmission: namespaceOwnership: InterNamespaceAllowed

Creating a route through an Ingress object

Some ecosystem components have an integration with Ingress resources but not with route resources. To cover this case, OKD automatically creates managed route objects when an Ingress object is created. These route objects are deleted when the corresponding Ingress objects are deleted.

Procedure

1. Define an Ingress object in the OKD console or by entering the oc create command:

   YAML Definition of an Ingress

   apiVersion: networking.k8s.io/v1
   kind: Ingress
   metadata:
     name: frontend
     annotations:
       route.openshift.io/termination: "reencrypt" (1)
       route.openshift.io/destination-ca-certificate-secret: secret-ca-cert (3)
   spec:
     rules:
     - host: www.example.com (2)
       http:
         paths:
         - backend:
             service:
               name: frontend
               port:
                 number: 443
           path: /
           pathType: Prefix
     tls:
     - hosts:
       - www.example.com
       secretName: example-com-tls-certificate

   1	The route.openshift.io/termination annotation can be used to configure the spec.tls.termination field of the Route as Ingress has no field for this. The accepted values are edge, passthrough and reencrypt. All other values are silently ignored. When the annotation value is unset, edge is the default route. The TLS certificate details must be defined in the template file to implement the default edge route.
   2	When working with an Ingress object, you must specify an explicit hostname, unlike when working with routes. You can use the <host_name>.<cluster_ingress_domain> syntax, for example apps.openshiftdemos.com, to take advantage of the *.<cluster_ingress_domain> wildcard DNS record and serving certificate for the cluster. Otherwise, you must ensure that there is a DNS record for the chosen hostname. If you specify the passthrough value in the route.openshift.io/termination annotation, set path to ‘’ and pathType to ImplementationSpecific in the spec: spec: rules: - host: www.example.com http: paths: - path: ‘’ pathType: ImplementationSpecific backend: service: name: frontend port: number: 443 $ oc apply -f ingress.yaml
   3	The route.openshift.io/destination-ca-certificate-secret can be used on an Ingress object to define a route with a custom destination certificate (CA). The annotation references a kubernetes secret, secret-ca-cert that will be inserted into the generated route. To specify a route object with a destination CA from an ingress object, you must create a kubernetes.io/tls or Opaque type secret with a certificate in PEM-encoded format in the data.tls.crt specifier of the secret.

2. List your routes:

   $ oc get routes

   The result includes an autogenerated route whose name starts with frontend-:

   NAME             HOST/PORT         PATH    SERVICES    PORT    TERMINATION          WILDCARD
   frontend-gnztq   www.example.com           frontend    443     reencrypt/Redirect   None

   If you inspect this route, it looks this:

   YAML Definition of an autogenerated route

   apiVersion: route.openshift.io/v1
   kind: Route
   metadata:
     name: frontend-gnztq
     ownerReferences:
     - apiVersion: networking.k8s.io/v1
       controller: true
       kind: Ingress
       name: frontend
       uid: 4e6c59cc-704d-4f44-b390-617d879033b6
   spec:
     host: www.example.com
     path: /
     port:
       targetPort: https
     tls:
       certificate: |
         -----BEGIN CERTIFICATE-----
         [...]
         -----END CERTIFICATE-----
       insecureEdgeTerminationPolicy: Redirect
       key: |
         -----BEGIN RSA PRIVATE KEY-----
         [...]
         -----END RSA PRIVATE KEY-----
       termination: reencrypt
       destinationCACertificate: |
         -----BEGIN CERTIFICATE-----
         [...]
         -----END CERTIFICATE-----
     to:
       kind: Service
       name: frontend

Creating a route using the destination CA certificate in the Ingress annotation

The route.openshift.io/destination-ca-certificate-secret annotation can be used on an Ingress object to define a route with a custom destination CA certificate.

Prerequisites

• You may have a certificate/key pair in PEM-encoded files, where the certificate is valid for the route host.

• You may have a separate CA certificate in a PEM-encoded file that completes the certificate chain.

• You must have a separate destination CA certificate in a PEM-encoded file.

• You must have a service that you want to expose.

Procedure

1. Add the route.openshift.io/destination-ca-certificate-secret to the Ingress annotations:

   apiVersion: networking.k8s.io/v1
   kind: Ingress
   metadata:
     name: frontend
     annotations:
       route.openshift.io/termination: "reencrypt"
       route.openshift.io/destination-ca-certificate-secret: secret-ca-cert (1)
   ...

   1	The annotation references a kubernetes secret.

2. The secret referenced in this annotation will be inserted into the generated route.

   Example output

   apiVersion: route.openshift.io/v1
   kind: Route
   metadata:
     name: frontend
     annotations:
       route.openshift.io/termination: reencrypt
       route.openshift.io/destination-ca-certificate-secret: secret-ca-cert
   spec:
   ...
     tls:
       insecureEdgeTerminationPolicy: Redirect
       termination: reencrypt
       destinationCACertificate: |
         -----BEGIN CERTIFICATE-----
         [...]
         -----END CERTIFICATE-----
   ...

Configuring the OKD Ingress Controller for dual-stack networking

If your OKD cluster is configured for IPv4 and IPv6 dual-stack networking, your cluster is externally reachable by OKD routes.

The Ingress Controller automatically serves services that have both IPv4 and IPv6 endpoints, but you can configure the Ingress Controller for single-stack or dual-stack services.

Prerequisites

• You deployed an OKD cluster on bare metal.

• You installed the OpenShift CLI (oc).

Procedure

1. To have the Ingress Controller serve traffic over IPv4/IPv6 to a workload, you can create a service YAML file or modify an existing service YAML file by setting the ipFamilies and ipFamilyPolicy fields. For example:

   Sample service YAML file

   apiVersion: v1
   kind: Service
   metadata:
     creationTimestamp: yyyy-mm-ddT00:00:00Z
     labels:
       name: <service_name>
       manager: kubectl-create
       operation: Update
       time: yyyy-mm-ddT00:00:00Z
     name: <service_name>
     namespace: <namespace_name>
     resourceVersion: "<resource_version_number>"
     selfLink: "/api/v1/namespaces/<namespace_name>/services/<service_name>"
     uid: <uid_number>
   spec:
     clusterIP: 172.30.0.0/16
     clusterIPs: (1)
     - 172.30.0.0/16
     - <second_IP_address>
     ipFamilies: (2)
     - IPv4
     - IPv6
     ipFamilyPolicy: RequireDualStack (3)
     ports:
     - port: 8080
       protocol: TCP
       targetport: 8080
     selector:
       name: <namespace_name>
     sessionAffinity: None
     type: ClusterIP
   status:
     loadbalancer: {}

   1	In a dual-stack instance, there are two different clusterIPs provided.
   2	For a single-stack instance, enter IPv4 or IPv6. For a dual-stack instance, enter both IPv4 and IPv6.
   3	For a single-stack instance, enter SingleStack. For a dual-stack instance, enter RequireDualStack.

   These resources generate corresponding endpoints. The Ingress Controller now watches endpointslices.

2. To view endpoints, enter the following command:

   $ oc get endpoints

3. To view endpointslices, enter the following command:

   $ oc get endpointslices