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Creating an Nginx Ingress on the Console
In Kubernetes, an ingress is a resource object that controls how Services within a cluster can be accessed from outside the cluster. You can use ingresses to configure different forwarding rules to access pods in a cluster. The following uses an Nginx workload as an example to describe how to create an Nginx ingress on the console.
Prerequisites
- An ingress provides network access for backend workloads. Ensure that a workload is available in a cluster. If no workload is available, deploy a workload by referring to Creating a Deployment, Creating a StatefulSet, or Creating a DaemonSet.
- A ClusterIP or NodePort Service has been configured for the workload. For details about how to configure the Service, see ClusterIP or NodePort.
- To add Nginx Ingress, ensure that the NGINX Ingress Controller add-on has been installed in the cluster. For details, see Installing the Add-on.
Notes and Constraints
- It is not recommended modifying any configuration of a load balancer on the ELB console. Otherwise, the Service will be abnormal. If you have modified the configuration, uninstall the nginx-ingress add-on and reinstall it.
- The URL registered in an ingress forwarding policy must be the same as the URL used to access the backend Service. Otherwise, a 404 error will be returned.
- The selected or created load balancer must be in the same VPC as the current cluster, and it must match the load balancer type (private or public network).
- The load balancer has at least two listeners, and ports 80 and 443 are not occupied by listeners.
Creating an Nginx Ingress
This section uses an Nginx workload as an example to describe how to create an Nginx ingress.
- Log in to the CCE console and click the cluster name to access the cluster console.
- Choose Services & Ingresses in the navigation pane, click the Ingresses tab, and click Create Ingress in the upper right corner.
- Configure ingress parameters.
- Name: Customize the name of an ingress, for example, nginx-ingress-demo.
- Namespace: Select the namespace to which the ingress is to be added.
- nginx-ingress: This option is displayed only after the NGINX Ingress Controller add-on is installed in the cluster.
- External Protocol: The options are HTTP and HTTPS. The default number of the listening port reserved when NGINX Ingress Controller is installed is 80 for HTTP and 443 for HTTPS. To use HTTPS, configure a certificate.
- Certificate Source: source of a certificate for encrypting and authenticating HTTPS data transmission.
- If you select a TLS key, you must create a key certificate of the IngressTLS or kubernetes.io/tls type beforehand. For details, see Creating a Secret.
- If you select the default certificate, NGINX Ingress Controller will use its default certificate for encryption and authentication. You can configure the default certificate during NGINX Ingress Controller installation. If the default certificate is not configured, the certificate provided by NGINX Ingress Controller will be used.
- SNI: stands for Server Name Indication (SNI), which is an extended protocol of TLS. SNI allows multiple TLS-compliant domain names for external access using the same IP address and port number, and different domain names can use different security certificates. After SNI is enabled, the client is allowed to submit the requested domain name when initiating a TLS handshake request. After receiving the TLS request, the load balancer searches for the certificate based on the domain name in the request. If the certificate corresponding to the domain name is found, the load balancer returns the certificate for authorization. Otherwise, the default certificate (server certificate) is returned for authorization.
- Forwarding Policy: When the access address of a request matches the forwarding policy (a forwarding policy consists of a domain name and URL), the request is forwarded to the corresponding target Service for processing. Click Add Forwarding Policies to add multiple forwarding policies.
- Domain Name: actual domain name. Ensure that the entered domain name has been registered and archived. After the ingress is created, bind the domain name to the IP address of the automatically created load balancer (IP address of the ingress access address). If a domain name rule is configured, the domain name must always be used for access.
- Path Matching Rule:
- Default: Prefix match is used by default.
- Prefix match: If the URL is set to /healthz, the URL that meets the prefix can be accessed, for example, /healthz/v1 and /healthz/v2.
- Exact match: The URL can be accessed only when it is fully matched. For example, if the URL is set to /healthz, only /healthz can be accessed.
- Path: access path, for example, /healthz
NOTE:
- The access path matching rule of Nginx Ingress is based on the path prefix separated by the slash (/) and is case-sensitive. If the subpath separated by a slash (/) matches the prefix, the access is normal. However, if the prefix is only a part of the character string in the subpath, the access is not matched. For example, if the URL is set to /healthz, /healthz/v1 is matched, but /healthzv1 is not matched.
- The access path added here must exist in the backend application. Otherwise, the forwarding fails.
For example, the default access URL of the Nginx application is /usr/share/nginx/html. When adding /test to the ingress forwarding policy, ensure the access URL of your Nginx application contains /usr/share/nginx/html/test. Otherwise, error 404 will be returned.
- Destination Service: Select an existing Service or create a Service. Any Services that do not match the search criteria will be filtered out automatically.
- Destination Service Port: Select the access port of the destination Service.
- Operation: Click Delete to delete the configuration.
- Annotation: The value is in the format of key:value. You can use annotations to query the configurations supported by nginx-ingress.
- Click OK.
After the ingress is created, it is displayed in the ingress list.
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