Service annotations

These annotations can be set in a Kubernetes Service object’s metadata.annotations section to change how requests are routed for a particular service.

Service annotations reference Jump to heading #

backend-config-snippet Jump to heading #

Defines a group of configuration directives to add directly to a HAProxy backend section.

Values

• One or more valid HAProxy directives

Default

• No default value

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/backend-config-snippet: |
      http-send-name-header x-dst-server
      stick-table type string len 32 size 100k expire 30m
      stick on req.cook(sessionid)

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/backend-config-snippet: |
      http-send-name-header x-dst-server
      stick-table type string len 32 size 100k expire 30m
      stick on req.cook(sessionid)

check Jump to heading #

Enables TCP level health checks on pods and attempts a TCP connection periodically.

Values

• true
• false

Default

• true

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/check: "true"

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/check: "true"

check-http Jump to heading #

Enables HTTP level health checks on pods and sends an HTTP request periodically. The check setting must be true.

Values

• URI to make HTTP requests to, e.g. /health
• URI with method, e.g. HEAD /health
• URI, method and HTTP version, e.g. HEAD /health HTTP/1.1

Default

• No default value

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/check: "true"
    haproxy.org/check-http: "/health"

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/check: "true"
    haproxy.org/check-http: "/health"

check-interval Jump to heading #

Sets the interval between health checks when check is enabled.

Values

• Integer with time unit suffix (1m = 1 minute, 10s = 10 seconds)

Default

• No default value

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/check: "true"
    haproxy.org/check-interval: "1m"

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/check: "true"
    haproxy.org/check-interval: "1m"

cookie-persistence Jump to heading #

Enables persistent connections (sticky sessions) between a client and a pod by inserting a cookie into the client’s browser that is used to remember which backend pod they connected to before. Dynamic cookies are used by default via a dynamic-cookie-key in order to support sticky sessions across multiple Ingress Controller instances/replicas.

• This will insert the following cookie configuration in the corresponding backend cookie <cookie-name> insert indirect nocache dynamic with <cookie-name> the value of this annotation.

Values

• A name for the cookie

Default

• No default value

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/cookie-persistence: "mycookie"

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/cookie-persistence: "mycookie"

forwarded-for Jump to heading #

Adds the X-Forwarded-For HTTP header to requests to capture and relay the client’s source IP address to backend pods.

Values

• true
• false

Default

• true

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/forwarded-for: "true"

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/forwarded-for: "true"

load-balance Jump to heading #

Sets the load-balancing algorithm to use.

Values

• roundrobin
• static-rr
• leastconn
• first
• source
• uri [path-only] [whole] [len num] [depth num]
• url_param name [check_post num]
• hdr[(name)] [use_domain_only]
• random[(draws)]
• rdp-cookie[(name)]

Default

• roundrobin

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/load-balance: "leastconn"

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/load-balance: "leastconn"

pod-maxconn Jump to heading #

Sets the maximum number of concurrent connections (maxconn) on a backend server (application pod).

• NB, If multiple HAProxy instances are running, the maxconn will be pod-maxconn number devided by the number of haproxy instances.

Values

• An integer setting the maximum number of concurrent backend connections

Default

• No default value

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/pod-maxconn: 30

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/pod-maxconn: 30

route-acl Jump to heading #

Insert a custom route (use_backend rule) to route ingress traffic to the annotated service based on the provided ACL.

• In order for the service to be handled by the Ingress Controller, it is still mandatory to put it in an ingress rule. Using only route-acl won’t be enough.
• Note that this annotation is not compatible with an Ingress having multiple paths that will match a request. Without this annotation, the precedence is given first to the longest matching path. But with the annotation, the first use_backend rule in the config that matches the request will be used.

Values

• A string describing an in-line HAProxy ACL.

Default

• No default value

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/route-acl: cookie(staging) -m found

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/route-acl: cookie(staging) -m found

scale-server-slots Jump to heading #

Sets the number of server slots to provision in order for HAProxy to scale dynamically with no reload. If this number is greater than the available endpoints/addresses, the remaining slots will be disabled (put on stand-by) and ready to be used. If this number is lower, the remaining endpoints/addresses will be added after scaling the HAProxy backend with a reload.

• Equivalent old annotations are servers-increment and server-slots

Values

• Integer value indicating the number of backend servers to provision. Defaults to 42.

Default

• 42

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/scale-server-slots: "75"

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/scale-server-slots: "75"

send-proxy-protocol Jump to heading #

Uses the PROXY Protocol when connecting to backend servers.

Values

• proxy - Uses PROXY v1
• proxy-v1 - Uses PROXY v1
• proxy-v2 - Uses PROXY v2
• proxy-v2-ssl Uses PROXY v2 with SSL information extension
• proxy-v2-ssl-cn Uses PROXY v2 with SSL and Common Name information extension

Default

• No default value

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/send-proxy-protocol: proxy-v2

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/send-proxy-protocol: proxy-v2

server-ca Jump to heading #

Sets the certificate authority for backend servers enabling HAProxy to check backend certificates (TLS authentication) when sending encrypted traffic to the kubernetes applications.

• When used with server-crt resulting configuration provides mutual TLS authentication (mTLS).
• The secret must use ‘tls.crt’ key.

Values

• Secret path following namespace/secretname format.

Default

• No default value

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/server-ca: "ns1/ca"

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/server-ca: "ns1/ca"

server-crt Jump to heading #

Specifies the path of a secret containing a certificate that HAProxy can provide during TLS communication with the backend servers.

• The secret must use ‘tls.key’ and ‘tls.crt’ keys.
• When used with server-ca resulting configuration provides mutual TLS authentication (mTLS).

Values

• Secret path following namespace/secretname format.

Default

• No default value

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/server-crt: "ns1/client"

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/server-crt: "ns1/client"

server-proto Jump to heading #

HTTP/1.1 is the default protocol for backend servers communication. Currently, the server-proto annotation supports only “h2” as a value (supporting fcgi is also planned) which transmits HTTP/2 messages in the clear to the backend servers. However, when SSL is enabled on the backend, server-proto is ignored and both HTTP/1.1 and HTTP/2 are advertised via ALPN and transmitted as encrypted messages.

Values

• h2

Default

• No default value

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/server-proto: "h2"

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/server-proto: "h2"

server-ssl Jump to heading #

Enables SSL to pods.

• Enable HTTP/2 support for backend severs.

Values

• true
• false

Default

• false

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/server-ssl: "true"

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/server-ssl: "true"

ssl-passthrough Jump to heading #

Passes SSL/TLS traffic through at Layer 4 directly to the backend service without Layer 7 inspection.

• Traffic is proxied in TCP mode which makes unavailable a number of the controller annotations (requiring HTTP mode).
• HTTPS frontend is conserved and still listening at port 8444 when previous HTTPS port is moved to SSL Frontend.

Values

• true
• false

Default

• false

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/ssl-passthrough: "true"

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/ssl-passthrough: "true"

standalone-backend Jump to heading #

Creates a specific and separated backend for this ingress in case multiple ingresses refer to the same service.

• With this annotation you can create your own separate backend whose configuration won’t be impacted by others ingresses. As a reminder, all ingresses refering to the same service have their configuration inserted in the same backend which can cause some conflict.

Values

• true
• false

Default

• No default value

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/standalone-backend: "true"

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/standalone-backend: "true"

timeout-check Jump to heading #

Sets an additional check timeout, but only after a connection has been already established.

Values

• An integer with a unit of time (1 second = 1s, 1 minute = 1m, 1h = 1 hour)

Default

• No default value

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/timeout-check: 5s

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/timeout-check: 5s

timeout-server Jump to heading #

Sets the maximum inactivity time on the server side.

Values

• An integer with a unit of time (1 second = 1s, 1 minute = 1m, 1h = 1 hour); Defaults to 50s

Default

• 50s

Example

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/timeout-server: 5s

yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    run: web
  name: web
  annotations:
    haproxy.org/timeout-server: 5s