Canary Releasing

What’s this?

F5 CIS AS3 support Canary Releasing, no matter two services in sample namespaces of single K8S cluster, or two services in different namespaces of different K8S clusters.

This page contains the demonstrations that 5 types of Canary Releasing F5 CIS AS3 supported.

F5 CIS support Canary Releasing via iRules.

Five types of Canary Releasing

Deploy Services
kubectl apply -f backend-canary.yaml

This will deploy 2 services, the /version will return app version, the 1st return {"appVersion": "1.0"}, the 2nd service return {"appVersion": "1.1"}.

URL

1. Key iRules
when HTTP_REQUEST {
   if { [HTTP::uri] starts_with "/foo" } {
    pool /test001/test001_app-v2-svc_svc/test001_app-v2-svc_80_pool
    } else {
    pool /test001/test001_app-v1-svc_svc/test001_app-v1-svc_80_pool
   }
}
2. Deploy to F5
kubectl apply -f cm-canary-url.yaml
3. Demonstrations
$ curl http://192.168.5.40/bar

F5 Demo App

    Request URI: /bar

    Server IP: 10.244.2.78
    Server Port: 8080
    Server Hostname: app-v1-ff65997d6-h28f4

$ curl http://192.168.5.40/foo

F5 Demo App

    Request URI: /foo

    Server IP: 10.244.2.77
    Server Port: 8080
    Server Hostname: app-v2-548875d666-tzc5c

Source Address

1. Key iRules
when CLIENT_ACCEPTED {
  if {[IP::addr [IP::client_addr] equals 192.168.5.30] or [IP::addr [IP::client_addr] equals 192.168.5.0/24]} {
    pool /test001/test001_app-v2-svc_svc/test001_app-v2-svc_80_pool
  } else {
    pool /test001/test001_app-v1-svc_svc/test001_app-v1-svc_80_pool
  }
}
2. Deploy to F5
kubectl apply -f cm-canary-sourceaddr.yaml
3. Demonstrations
$ curl http://192.168.5.40/bar

F5 Demo App

    Request URI: /bar

    Server IP: 10.244.2.77
    Server Port: 8080
    Server Hostname: app-v2-548875d666-tzc5c

Http Header

1. Key iRules
when HTTP_REQUEST {
  if {[HTTP::header exists "Canary"] and [HTTP::header values "Canary"] equals "true"} {
    pool /test001/test001_app-v2-svc_svc/test001_app-v2-svc_80_pool
  } else {
    pool /test001/test001_app-v1-svc_svc/test001_app-v1-svc_80_pool
  }
}
2. Deploy to F5
kubectl apply -f cm-canary-headers.yaml
3. Demonstrations
$ curl http://192.168.5.40/bar

F5 Demo App

    Request URI: /bar

    Server IP: 10.244.2.78
    Server Port: 8080
    Server Hostname: app-v1-ff65997d6-h28f4

$ curl --header "Canary: true" http://192.168.5.40/bar

F5 Demo App

    Request URI: /bar

    Server IP: 10.244.2.77
    Server Port: 8080
    Server Hostname: app-v2-548875d666-tzc5c

Cookie

1. Key iRules
when HTTP_REQUEST {
  if {[HTTP::cookie exists "Canary"] and [HTTP::cookie value "Canary"] equals "true"} {
    pool /test001/test001_app-v2-svc_svc/test001_app-v2-svc_80_pool
  } else {
    pool /test001/test001_app-v1-svc_svc/test001_app-v1-svc_80_pool
  }
}
2. Deploy to F5
kubectl apply -f cm-canary-cookie.yaml
3. Demonstrations
$ curl  http://192.168.5.40/bar

F5 Demo App

    Request URI: /bar

    Server IP: 10.244.2.78
    Server Port: 8080
    Server Hostname: app-v1-ff65997d6-h28f4

$ curl --cookie "Canary=true" http://192.168.5.40/bar

F5 Demo App

    Request URI: /bar

    Server IP: 10.244.2.77
    Server Port: 8080
    Server Hostname: app-v2-548875d666-tzc5c

Ratio

1. Key iRules
// option 1:
when HTTP_REQUEST {
  if {[format %0.2f [expr {rand()}]] < 0.25} {
      pool /test001/test001_app-v2-svc_svc/test001_app-v2-svc_80_pool
  } else {
      pool /test001/test001_app-v1-svc_svc/test001_app-v1-svc_80_pool
  }
}

// option 2:
when CLIENT_ACCEPTED {
  if {[expr {[expr {0xffffffff & [crc32 [IP::client_addr]]}] % 100}] < 25} {
    pool /test001/test001_app-v2-svc_svc/test001_app-v2-svc_80_pool
  } else {
    pool /test001/test001_app-v1-svc_svc/test001_app-v1-svc_80_pool
  }
}
2. Deploy to F5
kubectl apply -f cm-canary-ratio.yaml

cm-canary-ratio.yaml

3. Demonstrations
$ curl  http://192.168.5.40/

F5 Demo App

    Request URI: /

    Server IP: 10.244.2.77
    Server Port: 8080
    Server Hostname: app-v2-548875d666-tzc5c

$ curl  http://192.168.5.40/

F5 Demo App

    Request URI: /

    Server IP: 10.244.2.78
    Server Port: 8080
    Server Hostname: app-v1-ff65997d6-h28f4

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