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ConfigMap and Annotations

The Ingress resource only allows you to use basic NGINX features -- host and path-based routing and TLS termination. Thus, advanced features like rewriting the request URI or inserting additional response headers are not available.

In addition to using advanced features, often it is necessary to customize or fine tune NGINX behavior. For example, set the number of worker processes or customize the access log format.

Special ConfigMap resource and Annotations applied to an Ingress resource allow you to:

  • Use advanced NGINX features.
  • Customize NGINX behavior.

This document describes how to use the ConfigMap resource and Annotations and what features and customization options are available.

Using ConfigMap

  1. Our installation instructions deploy an empty ConfigMap while the default installation manifests specify it in the command-line arguments of the Ingress controller. However, if you customized the manifests, to use ConfigMap, make sure to specify the ConfigMap resource to use through the command-line arguments of the Ingress controller.

  2. Create a ConfigMap file with the name nginx-config.yaml and set the values that make sense for your setup:

    kind: ConfigMap
    apiVersion: v1
    metadata:
      name: nginx-config
      namespace: nginx-ingress
    data:
      proxy-connect-timeout: "10s"
      proxy-read-timeout: "10s"
      client-max-body-size: "2m"

    See the section Summary of ConfigMap and Annotations for the explanation of the available ConfigMap keys (such as proxy-connect-timeout in this example).

  3. Create a new (or update the existing) ConfigMap resource:

    $ kubectl apply -f nginx-config.yaml
    

    The NGINX configuration will be updated.

Using Annotations

Here is an example of using annotations to customize the configuration for a particular Ingress resource:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: cafe-ingress-with-annotations
  annotations:
    nginx.org/proxy-connect-timeout: "30s"
    nginx.org/proxy-read-timeout: "20s"
    nginx.org/client-max-body-size: "4m"
    nginx.org/server-snippets: |
      location / {
        return 302 /coffee;
      }
spec:
  rules:
  - host: cafe.example.com
    http:
      paths:
      - path: /tea
        backend:
          serviceName: tea-svc
          servicePort: 80
      - path: /coffee
        backend:
          serviceName: coffee-svc
          servicePort: 80

Note: Annotations take precedence over the ConfigMap.

Summary of ConfigMap and Annotations

Note: The annotations that start with nginx.com are only supported with NGINX Plus.

Ingress Controller (Not Related to NGINX Configuration)

Annotation ConfigMap Key Description Default Example
kubernetes.io/ingress.class N/A Specifies which Ingress controller must handle the Ingress resource. Set to nginx to make NGINX Ingress controller handle it. N/A Multiple Ingress controllers.
N/A external-status-address Sets the address to be reported in the status of Ingress resources. Requires the -report-status command-line argument. Overrides the -external-service argument. N/A Report Ingress Status.

General Customization

Annotation ConfigMap Key Description Default Example
nginx.org/proxy-connect-timeout proxy-connect-timeout Sets the value of the proxy_connect_timeout and grpc_connect_timeout directive. 60s
nginx.org/proxy-read-timeout proxy-read-timeout Sets the value of the proxy_read_timeout and grpc_read_timeout directive. 60s
nginx.org/client-max-body-size client-max-body-size Sets the value of the client_max_body_size directive. 1m
nginx.org/proxy-buffering proxy-buffering Enables or disables buffering of responses from the proxied server. True
nginx.org/proxy-buffers proxy-buffers Sets the value of the proxy_buffers directive. Depends on the platform.
nginx.org/proxy-buffer-size proxy-buffer-size Sets the value of the proxy_buffer_size and grpc_buffer_size directives. Depends on the platform.
nginx.org/proxy-max-temp-file-size proxy-max-temp-file-size Sets the value of the proxy_max_temp_file_size directive. 1024m
N/A set-real-ip-from Sets the value of the set_real_ip_from directive. N/A
N/A real-ip-header Sets the value of the real_ip_header directive. X-Real-IP
N/A real-ip-recursive Enables or disables the real_ip_recursive directive. False
nginx.org/server-tokens server-tokens Enables or disables the server_tokens directive. Additionally, with the NGINX Plus, you can specify a custom string value, including the empty string value, which disables the emission of the “Server” field. True
N/A worker-processes Sets the value of the worker_processes directive. auto
N/A worker-rlimit-nofile Sets the value of the worker_rlimit_nofile directive. N/A
N/A worker-connections Sets the value of the worker_connections directive. 1024
N/A worker-cpu-affinity Sets the value of the worker_cpu_affinity directive. N/A
N/A worker-shutdown-timeout Sets the value of the worker_shutdown_timeout directive. N/A
N/A server-names-hash-bucket-size Sets the value of the server_names_hash_bucket_size directive. Depends on the size of the processor’s cache line.
N/A server-names-hash-max-size Sets the value of the server_names_hash_max_size directive. 512
N/A resolver-addresses Sets the value of the resolver addresses. Note: If you use a DNS name (ex., kube-dns.kube-system.svc.cluster.local) as a resolver address, NGINX Plus will resolve it using the system resolver during the start and on every configuration reload. As a consequence, If the name cannot be resolved or the DNS server doesn't respond, NGINX Plus will fail to start or reload. To avoid this, consider using only IP addresses as resolver addresses. Supported in NGINX Plus only. N/A Support for Type ExternalName Services.
N/A resolver-ipv6 Enables IPv6 resolution in the resolver. Supported in NGINX Plus only. True Support for Type ExternalName Services.
N/A resolver-valid Sets the time NGINX caches the resolved DNS records. Supported in NGINX Plus only. TTL value of a DNS record Support for Type ExternalName Services.
N/A resolver-timeout Sets the resolver_timeout for name resolution. Supported in NGINX Plus only. 30s Support for Type ExternalName Services.
N/A keepalive-timeout Sets the value of the keepalive_timeout directive. 65s
N/A keepalive-requests Sets the value of the keepalive_requests directive. 100

Logging

Annotation ConfigMap Key Description Default Example
N/A error-log-level Sets the global error log level for NGINX. notice
N/A access-log-off Disables the access log. False
N/A log-format Sets the custom log format. See the template file for the access log.
N/A stream-log-format Sets the custom log format for TCP/UDP load balancing. See the template file.

Request URI/Header Manipulation

Annotation ConfigMap Key Description Default Example
nginx.org/proxy-hide-headers proxy-hide-headers Sets the value of one or more proxy_hide_header directives. Example: "nginx.org/proxy-hide-headers": "header-a,header-b" N/A
nginx.org/proxy-pass-headers proxy-pass-headers Sets the value of one or more proxy_pass_header directives. Example: "nginx.org/proxy-pass-headers": "header-a,header-b" N/A
nginx.org/rewrites N/A Configures URI rewriting. N/A Rewrites Support.

Auth and SSL/TLS

Annotation ConfigMap Key Description Default Example
nginx.org/redirect-to-https redirect-to-https Sets the 301 redirect rule based on the value of the http_x_forwarded_proto header on the server block to force incoming traffic to be over HTTPS. Useful when terminating SSL in a load balancer in front of the Ingress controller — see 115 False
ingress.kubernetes.io/ssl-redirect ssl-redirect Sets an unconditional 301 redirect rule for all incoming HTTP traffic to force incoming traffic over HTTPS. True
nginx.org/hsts hsts Enables HTTP Strict Transport Security (HSTS): the HSTS header is added to the responses from backends. The preload directive is included in the header. False
nginx.org/hsts-max-age hsts-max-age Sets the value of the max-age directive of the HSTS header. 2592000 (1 month)
nginx.org/hsts-include-subdomains hsts-include-subdomains Adds the includeSubDomains directive to the HSTS header. False
nginx.org/hsts-behind-proxy hsts-behind-proxy Enables HSTS based on the value of the http_x_forwarded_proto request header. Should only be used when TLS termination is configured in a load balancer (proxy) in front of the Ingress Controller. Note: to control redirection from HTTP to HTTPS configure the nginx.org/redirect-to-https annotation. False
N/A ssl-protocols Sets the value of the ssl_protocols directive. TLSv1 TLSv1.1 TLSv1.2
N/A ssl-prefer-server-ciphers Enables or disables the ssl_prefer_server_ciphers directive. False
N/A ssl-ciphers Sets the value of the ssl_ciphers directive. HIGH:!aNULL:!MD5
N/A ssl-dhparam-file Sets the content of the dhparam file. The controller will create the file and set the value of the ssl_dhparam directive with the path of the file. N/A
nginx.com/jwt-key N/A Specifies a Secret resource with keys for validating JSON Web Tokens (JWTs). N/A Support for JSON Web Tokens (JWTs).
nginx.com/jwt-realm N/A Specifies a realm. N/A Support for JSON Web Tokens (JWTs).
nginx.com/jwt-token N/A Specifies a variable that contains JSON Web Token. By default, a JWT is expected in the Authorization header as a Bearer Token. Support for JSON Web Tokens (JWTs).
nginx.com/jwt-login-url N/A Specifies a URL to which a client is redirected in case of an invalid or missing JWT. N/A Support for JSON Web Tokens (JWTs).

Listeners

Annotation ConfigMap Key Description Default Example
N/A http2 Enables HTTP/2 in servers with SSL enabled. False
nginx.org/listen-ports N/A Configures HTTP ports that NGINX will listen on. [80]
nginx.org/listen-ports-ssl N/A Configures HTTPS ports that NGINX will listen on. [443]
N/A proxy-protocol Enables PROXY Protocol for incoming connections. False Proxy Protocol.

Backend Services (Upstreams)

Annotation ConfigMap Key Description Default Example
nginx.org/lb-method lb-method Sets the load balancing method. To use the round-robin method, specify "round_robin". "random two least_conn"
nginx.org/ssl-services N/A Enables HTTPS or gRPC over SSL when connecting to the endpoints of services. N/A SSL Services Support.
nginx.org/grpc-services N/A Enables gRPC for services. Note: requires HTTP/2 (see http2 ConfigMap key); only works for Ingresses with TLS termination enabled. N/A GRPC Services Support.
nginx.org/websocket-services N/A Enables WebSocket for services. N/A WebSocket support.
nginx.org/max-fails max-fails Sets the value of the max_fails parameter of the server directive. 1
nginx.org/fail-timeout fail-timeout Sets the value of the fail_timeout parameter of the server directive. 10s
nginx.com/sticky-cookie-services N/A Configures session persistence. N/A Session Persistence.
nginx.org/keepalive keepalive Sets the value of the keepalive directive. Note that proxy_set_header Connection ""; is added to the generated configuration when the value > 0. 0
nginx.com/health-checks N/A Enables active health checks. False Support for Active Health Checks.
nginx.com/health-checks-mandatory N/A Configures active health checks as mandatory. False Support for Active Health Checks.
nginx.com/health-checks-mandatory-queue N/A When active health checks are mandatory, configures a queue for temporary storing incoming requests during the time when NGINX Plus is checking the health of the endpoints after a configuration reload. 0 Support for Active Health Checks.
nginx.com/slow-start N/A Sets the upstream server slow-start period. By default, slow-start is activated after a server becomes available or healthy. To enable slow-start for newly added servers, configure mandatory active health checks. "0s"

Snippets and Custom Templates

Annotation ConfigMap Key Description Default Example
N/A main-snippets Sets a custom snippet in main context. N/A
N/A http-snippets Sets a custom snippet in http context. N/A
nginx.org/location-snippets location-snippets Sets a custom snippet in location context. N/A
nginx.org/server-snippets server-snippets Sets a custom snippet in server context. N/A
N/A stream-snippets Sets a custom snippet in stream context. N/A Support for TCP/UDP Load Balancing.
N/A main-template Sets the main NGINX configuration template. By default the template is read from the file in the container. Custom Templates.
N/A ingress-template Sets the NGINX configuration template for an Ingress resource. By default the template is read from the file on the container. Custom Templates.
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