Chapter 6. Configuring routes

6.1. 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-microshift application as an example.

Prerequisites

You installed the OpenShift CLI (oc).
You have access to your MicroShift cluster.
You have a web application that exposes a port and a TCP endpoint listening for traffic on the port.

Procedure

Create a service called hello-microshift by running the following command:
```
$ oc expose pod hello-microshift -n $namespace
```
Create an unsecured route to the hello-microshift application by running the following command:
```
$ oc expose svc/hello-microshift --hostname=microshift.com $namespace
```

Verification

Verify that the route resource was created by running the following command:
```
$ oc get routes -o yaml <name of resource> -n $namespace 1
```
1
In this example, the route is named hello-microshift and the namespace is named hello-microshift.

Sample YAML definition of the created unsecured route:

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  name: hello-microshift
  namespace: hello-microshift
spec:
  host: microshift.com 1
  port:
    targetPort: 8080 2
  to:
    kind: Service
    name: hello-microshift

1: Example hostname.
2: targetPort is required for the router to map the endpoint port in the service.
Note
MicroShift does not a use an API that creates a default ingress domain, but instead provides a wildcard for automatically generated domains. Each route can also define a separate hostname.

6.2. 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

Important

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

6.3. 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 have root access to the cluster.
You installed the OpenShift CLI (oc).

Procedure

To enable HSTS on a route, add the haproxy.router.openshift.io/hsts_header value to the edge-terminated or re-encrypt route. You can use the oc annotate tool to do this by running the following command:
```
$ oc annotate route <route_name> -n <namespace> --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=31536000;\ 1
includeSubDomains;preload"
```
1
In this example, the maximum age is set to 31536000 ms, which is approximately 8.5 hours.
Note
In this example, the equal sign (=) is in quotes. This is required to properly execute the annotate command.
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.

6.3.1. 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 have root access to the cluster.
You installed the OpenShift CLI (oc).

Procedure

To disable HSTS, set the max-age value in the route annotation to 0, by entering the following command:
```
$ oc annotate route <route_name> -n <namespace> --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=0"
```
Tip
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 following 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

6.3.2. Enforcing HTTP Strict Transport Security per-domain

You can configure a route 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.

Important

HSTS cannot be applied to insecure, or non-TLS, routes.

Prerequisites

You have root access to the cluster.
You installed the OpenShift CLI (oc).

Procedure

Apply HSTS to all routes in the cluster by running the following oc annotate command:

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

Apply HSTS to all routes in a particular namespace by running the following oc annotate command:

$ oc annotate route --all -n <my_namespace> --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=31536000;preload;includeSubDomains" 1

1: Replace <my_namespace> with the namespace you want to use.

Verification

Review the HSTS annotations on all routes by running 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

6.4. Throughput issue troubleshooting methods

Sometimes applications deployed by using MicroShift 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 MicroShift 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 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.

6.5. Using cookies to keep route statefulness

MicroShift 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.

MicroShift 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.

Note

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.

6.6. 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.

The following table shows example routes and their accessibility:

Table 6.1. 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.

Note

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.

6.7. HTTP header configuration

When setting or deleting headers, you can use an individual route to modify request and response headers. You can also set certain headers by using route annotations. The various ways of configuring headers can present challenges when working together.

Note

You can only set or delete headers within a Route CR. You cannot append headers. If an HTTP header is set with a value, that value must be complete and not require appending in the future. In situations where it makes sense to append a header, such as the X-Forwarded-For header, use the spec.httpHeaders.forwardedHeaderPolicy field, instead of spec.httpHeaders.actions.

Example Route spec

apiVersion: route.openshift.io/v1
kind: Route
# ...
spec:
  httpHeaders:
    actions:
      response:
      - name: X-Frame-Options
        action:
          type: Set
          set:
            value: SAMEORIGIN

Any actions defined in a route override values set using route annotations.

6.7.1. Special case headers

The following headers are either prevented entirely from being set or deleted, or allowed under specific circumstances:

Header name	Configurable using `Route` spec	Reason for disallowment	Configurable using another method
`proxy`	No	The `proxy` HTTP request header can be used to exploit vulnerable CGI applications by injecting the header value into the `HTTP_PROXY` environment variable. The `proxy` HTTP request header is also non-standard and prone to error during configuration.	No
`host`	Yes	When the `host` HTTP request header is set using the `IngressController` CR, HAProxy can fail when looking up the correct route.	No
`strict-transport-security`	No	The `strict-transport-security` HTTP response header is already handled using route annotations and does not need a separate implementation.	Yes: the `haproxy.router.openshift.io/hsts_header` route annotation
`cookie` and `set-cookie`	No	The cookies that HAProxy sets are used for session tracking to map client connections to particular back-end servers. Allowing these headers to be set could interfere with HAProxy’s session affinity and restrict HAProxy’s ownership of a cookie.	Yes: * the `haproxy.router.openshift.io/disable_cookie` route annotation * the `haproxy.router.openshift.io/cookie_name` route annotation

6.8. Setting or deleting HTTP request and response headers in a route

You can set or delete certain HTTP request and response headers for compliance purposes or other reasons. You can set or delete these headers either for all routes served by an Ingress Controller or for specific routes.

For example, you might want to enable a web application to serve content in alternate locations for specific routes if that content is written in multiple languages, even if there is a default global location specified by the Ingress Controller serving the routes.

The following procedure creates a route that sets the Content-Location HTTP request header so that the URL associated with the application, https://app.example.com, directs to the location https://app.example.com/lang/en-us. Directing application traffic to this location means that anyone using that specific route is accessing web content written in American English.

Prerequisites

You have installed the OpenShift CLI (oc).
You are logged into an MicroShift cluster 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.

Procedure

Create a route definition and save it in a file called app-example-route.yaml:
YAML definition of the created route with HTTP header directives
```
apiVersion: route.openshift.io/v1
kind: Route
# ...
spec:
  host: app.example.com
  tls:
    termination: edge
  to:
    kind: Service
    name: app-example
  httpHeaders:
    actions: 1
      response: 2
      - name: Content-Location 3
        action:
          type: Set 4
          set:
            value: /lang/en-us 5
```
1
The list of actions you want to perform on the HTTP headers.
2
The type of header you want to change. In this case, a response header.
3
The name of the header you want to change. For a list of available headers you can set or delete, see HTTP header configuration.
4
The type of action being taken on the header. This field can have the value Set or Delete.
5
When setting HTTP headers, you must provide a value. The value can be a string from a list of available directives for that header, for example DENY, or it can be a dynamic value that will be interpreted using HAProxy’s dynamic value syntax. In this case, the value is set to the relative location of the content.
Create a route to your existing web application using the newly created route definition:
```
$ oc -n app-example create -f app-example-route.yaml
```

For HTTP request headers, the actions specified in the route definitions are executed after any actions performed on HTTP request headers in the Ingress Controller. This means that any values set for those request headers in a route will take precedence over the ones set in the Ingress Controller. For more information on the processing order of HTTP headers, see HTTP header configuration.

6.9. 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, MicroShift 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 MicroShift 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 2
spec:
  rules:
  - host: www.example.com 3
    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.
3
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
2
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.

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

6.10. Creating a route using the default certificate through an Ingress object

If you create an Ingress object without specifying any TLS configuration, MicroShift generates an insecure route. To create an Ingress object that generates a secure, edge-terminated route using the default ingress certificate, you can specify an empty TLS configuration as follows.

Prerequisites

You have a service that you want to expose.
You have access to the OpenShift CLI (oc).

Procedure

Create a YAML file for the Ingress object. In this example, the file is called example-ingress.yaml:
YAML definition of an Ingress object
```
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: frontend
  ...
spec:
  rules:
    ...
  tls:
  - {} 1
```
1
Use this exact syntax to specify TLS without specifying a custom certificate.
Create the Ingress object by running the following command:
```
$ oc create -f example-ingress.yaml
```

Verification

Verify that MicroShift has created the expected route for the Ingress object by running the following command:
```
$ oc get routes -o yaml
```
Example output
```
apiVersion: v1
items:
- apiVersion: route.openshift.io/v1
  kind: Route
  metadata:
    name: frontend-j9sdd 1
    ...
  spec:
  ...
    tls: 2
      insecureEdgeTerminationPolicy: Redirect
      termination: edge 3
  ...
```
1
The name of the route includes the name of the Ingress object followed by a random suffix.
2
In order to use the default certificate, the route should not specify spec.certificate.
3
The route should specify the edge termination policy.

6.11. 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

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.

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-----
...

6.12. Secured routes

Secure routes provide the ability to use several types of TLS termination to serve certificates to the client. The following links to the OpenShift Container Platform documentation describe how to create re-encrypt, edge, and passthrough routes with custom certificates.

Questo contenuto non è disponibile nella lingua selezionata.

6.1. Creating an HTTP-based route

6.2. HTTP Strict Transport Security

6.3. Enabling HTTP Strict Transport Security per-route

6.3.1. Disabling HTTP Strict Transport Security per-route

6.3.2. Enforcing HTTP Strict Transport Security per-domain

6.4. Throughput issue troubleshooting methods

6.5. Using cookies to keep route statefulness

6.6. Path-based routes

6.7. HTTP header configuration

6.7.1. Special case headers

6.8. Setting or deleting HTTP request and response headers in a route

6.9. Creating a route through an Ingress object

6.10. Creating a route using the default certificate through an Ingress object

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

6.12. Secured routes

Formazione

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Questo contenuto non è disponibile nella lingua selezionata.

Chapter 6. Configuring routes

6.1. Creating an HTTP-based route

6.2. HTTP Strict Transport Security

6.3. Enabling HTTP Strict Transport Security per-route

6.3.1. Disabling HTTP Strict Transport Security per-route

6.3.2. Enforcing HTTP Strict Transport Security per-domain

6.4. Throughput issue troubleshooting methods

6.5. Using cookies to keep route statefulness

6.5.1. Annotating a route with a cookie

6.6. Path-based routes

6.7. HTTP header configuration

6.7.1. Special case headers

6.8. Setting or deleting HTTP request and response headers in a route

6.9. Creating a route through an Ingress object

6.10. Creating a route using the default certificate through an Ingress object

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

6.12. Secured routes

Formazione

Prova, acquista e vendi

Community

Informazioni sulla documentazione di Red Hat

Rendiamo l’open source più inclusivo

Informazioni su Red Hat

Red Hat legal and privacy links

Red Hat legal and privacy links