Route configuration

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

Create a project called hello-openshift by running the following command:
```
$ oc new-project hello-openshift
```

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

Create a service called hello-openshift by running the following command:
```
$ oc expose pod/hello-openshift
```
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}

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

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

HSTS works only with secure routes, either edge-terminated or re-encrypt. The configuration is ineffective on HTTP or passthrough routes.

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

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.

To handle upgraded clusters with non-compliant HSTS routes, you can update the manifests at the source and apply the updates.

You cannot use oc expose route or oc create route commands to add a route in a domain that enforces HSTS, because the API for these commands does not accept annotations.

HSTS cannot be applied to secure, or non-TLS routes, even if HSTS is requested for all routes globally.

Prerequisites

You are logged in to the cluster with a user with administrator privileges for the project.
You installed the oc CLI.

Procedure

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`.

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

Troubleshooting throughput issues

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

Use the following methods to analyze performance issues if pod logs do not reveal any cause of the problem:

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.

tcpdump generates a file at /tmp/dump.pcap containing all traffic between these two pods. Ideally, 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. Run the tool from the pods first, then from the nodes, to locate any bottlenecks.

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.

Cookies cannot be set on passthrough routes, because the HTTP traffic cannot be seen. Instead, a number is calculated based on the source IP address, which determines the backend.

If backends change, the traffic can be directed to the wrong server, making it less sticky. If you are using a load balancer, which hides source IP, the same number is set for all connections and traffic is sent to the same pod.

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

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"
```
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.
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:

Table 1. Route availability
Route	When Compared to	Accessible
www.example.com/test	www.example.com/test	Yes
www.example.com/test	www.example.com	No
www.example.com/test and www.example.com	www.example.com/test	Yes
www.example.com/test and www.example.com	www.example.com	Yes
www.example.com	www.example.com/text	Yes (Matched by the host, not the route)
www.example.com	www.example.com	Yes

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

1	The path is the only added attribute for a path-based route.

Path-based routing is not available when using passthrough TLS, as the router does not terminate TLS in that case and cannot read the contents of the request.

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.

To create a whitelist with multiple source IPs or subnets, use a space-delimited list. Any other delimiter type causes the list to be ignored without a warning or error message.

Table 2. Route annotations
Variable	Description	Environment variable used as default
`haproxy.router.openshift.io/balance`	Sets the load-balancing algorithm. Available options are `random`, `source`, `roundrobin`, and `leastconn`. The default value is `leastconn`.	`ROUTERTCP_BALANCE_SCHEME` for passthrough routes. Otherwise, use `ROUTER_LOAD_BALANCE_ALGORITHM`.
`haproxy.router.openshift.io/disable_cookies`	Disables the use of cookies to track related connections. If set to `‘true’` or `‘TRUE’`, the balance algorithm is used to choose which back-end serves connections for each incoming HTTP request.
`router.openshift.io/cookie_name`	Specifies an optional cookie to use for this route. The name must consist of any combination of upper and lower case letters, digits, ““, and “-“. The default is the hashed internal key name for the route.
`haproxy.router.openshift.io/pod-concurrent-connections`	Sets the maximum number of connections that are allowed to a backing pod from a router. Note: If there are multiple pods, each can have this many connections. If you have multiple routers, there is no coordination among them, each may connect this many times. If not set, or set to 0, there is no limit.
`haproxy.router.openshift.io/rate-limit-connections`	Setting `‘true’` or `‘TRUE’` enables rate limiting functionality which is implemented through stick-tables on the specific backend per route. Note: Using this annotation provides basic protection against distributed denial-of-service (DDoS) attacks.
`haproxy.router.openshift.io/rate-limit-connections.concurrent-tcp`	Limits the number of concurrent TCP connections made through the same source IP address. It accepts a numeric value. Note: Using this annotation provides basic protection against distributed denial-of-service (DDoS) attacks.
`haproxy.router.openshift.io/rate-limit-connections.rate-http`	Limits the rate at which a client with the same source IP address can make HTTP requests. It accepts a numeric value. Note: Using this annotation provides basic protection against distributed denial-of-service (DDoS) attacks.
`haproxy.router.openshift.io/rate-limit-connections.rate-tcp`	Limits the rate at which a client with the same source IP address can make TCP connections. It accepts a numeric value. Note: Using this annotation provides basic protection against distributed denial-of-service (DDoS) attacks.
`haproxy.router.openshift.io/timeout`	Sets a server-side timeout for the route. (TimeUnits)	`ROUTER_DEFAULT_SERVER_TIMEOUT`
`haproxy.router.openshift.io/timeout-tunnel`	This timeout applies to a tunnel connection, for example, WebSocket over cleartext, edge, reencrypt, or passthrough routes. With cleartext, edge, or reencrypt route types, this annotation is applied as a timeout tunnel with the existing timeout value. For the passthrough route types, the annotation takes precedence over any existing timeout value set.	`ROUTER_DEFAULT_TUNNEL_TIMEOUT`
`ingresses.config/cluster ingress.operator.openshift.io/hard-stop-after`	You can set either an IngressController or the ingress config . This annotation redeploys the router and configures the HA proxy to emit the haproxy `hard-stop-after` global option, which defines the maximum time allowed to perform a clean soft-stop.	`ROUTER_HARD_STOP_AFTER`
`router.openshift.io/haproxy.health.check.interval`	Sets the interval for the back-end health checks. (TimeUnits)	`ROUTER_BACKEND_CHECK_INTERVAL`
`haproxy.router.openshift.io/ip_whitelist`	Sets a whitelist for the route. The whitelist is a space-separated list of IP addresses and CIDR ranges for the approved source addresses. Requests from IP addresses that are not in the whitelist are dropped. The maximum number of IP addresses and CIDR ranges allowed in a whitelist is 61.
`haproxy.router.openshift.io/hsts_header`	Sets a Strict-Transport-Security header for the edge terminated or re-encrypt route.
`haproxy.router.openshift.io/log-send-hostname`	Sets the `hostname` field in the Syslog header. Uses the hostname of the system. `log-send-hostname` is enabled by default if any Ingress API logging method, such as sidecar or Syslog facility, is enabled for the router.
`haproxy.router.openshift.io/rewrite-target`	Sets the rewrite path of the request on the backend.
`router.openshift.io/cookie-same-site`	Sets a value to restrict cookies. The values are: `Lax`: cookies are transferred between the visited site and third-party sites. `Strict`: cookies are restricted to the visited site. `None`: cookies are restricted to the visited site. This value is applicable to re-encrypt and edge routes only. For more information, see the SameSite cookies documentation.
`haproxy.router.openshift.io/set-forwarded-headers`	Sets the policy for handling the `Forwarded` and `X-Forwarded-For` HTTP headers per route. The values are: `append`: appends the header, preserving any existing header. This is the default value. `replace`: sets the header, removing any existing header. `never`: never sets the header, but preserves any existing header. `if-none`: sets the header if it is not already set.	`ROUTER_SET_FORWARDED_HEADERS`

Environment variables cannot be edited.

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).

Variable	Default	Description
`ROUTER_BACKEND_CHECK_INTERVAL`	`5000ms`	Length of time between subsequent liveness checks on back ends.
`ROUTER_CLIENT_FIN_TIMEOUT`	`1s`	Controls the TCP FIN timeout period for the client connecting to the route. If the FIN sent to close the connection does not answer within the given time, HAProxy closes the connection. This is harmless if set to a low value and uses fewer resources on the router.
`ROUTER_DEFAULT_CLIENT_TIMEOUT`	`30s`	Length of time that a client has to acknowledge or send data.
`ROUTER_DEFAULT_CONNECT_TIMEOUT`	`5s`	The maximum connection time.
`ROUTER_DEFAULT_SERVER_FIN_TIMEOUT`	`1s`	Controls the TCP FIN timeout from the router to the pod backing the route.
`ROUTER_DEFAULT_SERVER_TIMEOUT`	`30s`	Length of time that a server has to acknowledge or send data.
`ROUTER_DEFAULT_TUNNEL_TIMEOUT`	`1h`	Length of time for TCP or WebSocket connections to remain open. This timeout period resets whenever HAProxy reloads.
`ROUTER_SLOWLORIS_HTTP_KEEPALIVE`	`300s`	Set the maximum time to wait for a new HTTP request to appear. If this is set too low, it can cause problems with browsers and applications not expecting a small `keepalive` value. Some effective timeout values can be the sum of certain variables, rather than the specific expected timeout. For example, `ROUTER_SLOWLORIS_HTTP_KEEPALIVE` adjusts `timeout http-keep-alive`. It is set to `300s` by default, but HAProxy also waits on `tcp-request inspect-delay`, which is set to `5s`. In this case, the overall timeout would be `300s` plus `5s`.
`ROUTER_SLOWLORIS_TIMEOUT`	`10s`	Length of time the transmission of an HTTP request can take.
`RELOAD_INTERVAL`	`5s`	Allows the minimum frequency for the router to reload and accept new changes.
`ROUTER_METRICS_HAPROXY_TIMEOUT`	`5s`	Timeout for the gathering of HAProxy metrics.

A route setting custom timeout

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

1	Specifies the new timeout with HAProxy supported units (`us`, `ms`, `s`, `m`, `h`, `d`). If the unit is not provided, `ms` is the default.

Setting a server-side timeout value for passthrough routes too low can cause WebSocket connections to timeout frequently on that route.

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)
...

1	Sets `/` as rewrite path of the request on the backend.

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.

Table 3. rewrite-target examples:
Route.spec.path	Request path	Rewrite target	Forwarded request path
/foo	/foo	/	/
/foo	/foo/	/	/
/foo	/foo/bar	/	/bar
/foo	/foo/bar/	/	/bar/
/foo	/foo	/bar	/bar
/foo	/foo/	/bar	/bar/
/foo	/foo/bar	/baz	/baz/bar
/foo	/foo/bar/	/baz	/baz/bar/
/foo/	/foo	/	N/A (request path does not match route path)
/foo/	/foo/	/	/
/foo/	/foo/bar	/	/bar

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.

Allowing claims across namespaces should only be enabled for clusters with trust between namespaces, otherwise a malicious user could take over a hostname. For this reason, the default admission policy disallows hostname claims across namespaces.

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

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)
spec:
  rules:
  - host: www.example.com
    http:
      paths:
      - backend:
          service:
            name: frontend
            port:
              number: 443
        path: /
        pathType: Prefix
  tls:
  - hosts:
    - www.example.com
    secretName: example-com-tls-certificate

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.

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

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
  to:
    kind: Service
    name: frontend

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

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.

To view endpoints, enter the following command:
```
$ oc get endpoints
```
To view endpointslices, enter the following command:
```
$ oc get endpointslices
```