Linkerd traffic splitting 🧙🏼

This demonstrates Linkerd's traffic splitting with real code.

• This code deploys 3 Apps with 1 client
• go-open-api-v2 will start rejecting the client creation calls as it has a change in it's spec.

This example deploys three backends that all operate slightly differently. We can deploy traffic split to measure their performance...

As seen here...

And now we see our split traffic ✨

Setup 🙋

• kind create cluster --image rossgeorgiev/kind-node-arm64:v1.20.0
• linkerd install | kubectl apply -f -
• linkerd viz install | kubectl apply -f -
• kubectl create ns apps
• kubectl annotate ns apps "linkerd.io/inject=enabled"

cd demo
./deploy_with_helm.sh

❯ k get pods -n apps
NAME                                 READY   STATUS    RESTARTS   AGE
go-openapi-client-668b94dbf4-wp46d   2/2     Running   0          2m24s
go-openapi-v1-549c9cb676-kj7z7       2/2     Running   0          2m34s
go-openapi-v2-7bb874cf5b-qbtpf       2/2     Running   0          2m30s
go-openapi-v3-7d4dfcd8d4-fq7vd       2/2     Running   0          115s

Apply the traffic split kubectl apply -f demo/traffic-split.yaml 💅

Code differences with go-openapi-v2

The V2 API decided all users need to state their food preferences for the international buffet. 🥝🫑🌶🥒🥬

#go-openapi-v2
definitions:
  User:
    type: "object"
    required:
      - foodPreference
    properties:
      id:
        type: "integer"
        format: "int64"
      username:
        type: "string"
      firstName:
        type: "string"
      lastName:
        type: "string"
      foodPreference:
        type: "string"

Let's post to test that new API directly...

curl -X POST "http://localhost:8080/v2/user" -H  "accept: application/xml" -H  "Content-Type: application/json" -d "{  \"email\": \"string\",  \"firstName\": \"string\",  \"id\": 0,  \"lastName\": \"string\",  \"password\": \"string\",  \"phone\": \"string\",  \"userStatus\": 0,  \"username\": \"alex\"}"
{"code":602,"message":"foodPreference in body is required"}%

Bummer! 🙅🏽

See that a bunch of stuff is erroring out due to missing field on the User object yay, it works! 👍

│ go-openapi-client &{madisonwhite662@example.org Matthew Harris <nil> 0 Wilson Cougarfir +243 56 11472 4389 0 Spiritshell}                                                           │
│ go-openapi-client Error:  [POST /user][422] createUser default                                                                                                                      │
│ go-openapi-client &{charlottejones332@example.net Addison Robinson <nil> 0 Thomas Painterrust +371 750 5343 155 2 0 Fishersleet}                                                    │
│ go-openapi-client Error:  [POST /user][422] createUser default                                                                                                                      │
│ go-openapi-client &{aidenwilson270@example.net Olivia White <nil> 0 Thompson Whipwheat +241 665 6 0395302 0 Thiefdark}                                                              │
│ go-openapi-client &{williamgarcia341@example.com Madison Miller <nil> 0 Davis Touchplanet +972 037 3996359 5 0 Tradergravel}                                                        │
│ go-openapi-client Error:  [POST /user][422] createUser default                                                                                                                      │
│ go-openapi-client &{madisongarcia667@example.org William Williams <nil> 0 Garcia Binderplume +880 304 77801444 0 Foxrowan}                                                          │
│ go-openapi-client Error:  [POST /user][422] createUser default                                                                                                                      │
│ go-openapi-client &{madisonthompson427@example.org Olivia Wilson <nil> 0 Williams Salmonoasis +252 4 1543558433 0 Ladysplit}                                                        │
│ go-openapi-client Error:  [POST /user][422] createUser default                                                                                                                      │
│ go-openapi-client &{joshuamiller826@example.com Matthew Miller <nil> 0 White Volescratch +506 201 753 611 52 0 Whipchrome}                                                          │
│ go-openapi-client Error:  [POST /user][422] createUser default                                                                                                                      │
│ go-openapi-client &{noahmartin562@example.org James Anderson <nil> 0 Taylor Butterflysugar +45 33 817 26608 55 0 Cowlbrick}                                                         │
│ go-openapi-client &{addisonbrown520@test.org Avery White <nil> 0 Thomas Napeshadow +33 73 9182632411 0 Servantharvest}                                                              │
│ go-openapi-client &{aidenwhite622@example.org Natalie Jones <nil> 0 Robinson Pixieglory +993 85 23550 92 3 2 0 Vulturetulip}                                                        │
│ go-openapi-client &{sofiajones246@example.net Benjamin Thompson <nil> 0 White Slicerweak +963 717 1 6 124055 0 Shirttranslucent}                                                    │
│ go-openapi-client &{zoeywilson061@example.com Mia Williams <nil> 0 Miller Whaleolive +218 53 81547153 6 0 Princessbog}

Code differences with go-openapi-v3

This backend introduces heavy latency