Locust to Go, Kubernetes to Load

Locust to Go, Kubernetes to Load ===   "Go" to "load" test :dizzy: > [name=郭學聰 Hsueh-Tsung Kuo] [time=Sat, 11 Aug 2018] [color=red] ---  ## who am I? ![fieliapm](https://pbs.twimg.com/profile_images/591670980021387264/aZAYLRUe_400x400.png) ----  * programmer from Rayark, a game company in Taiwan * backend engineer, focus on common service * usually develop something related to my work in Python, Ruby, Golang, C# * built almost entire VOEZ game server by myself only * supported Sdorica backend development ---  ## outline ----  4. Locust <- Python 1. Locust? 2. usage 5. Locust -> Go 1. interoperability 2. boomer 6. play http service 7. docker & Kubernetes 1. docker 2. Kubernetes ----  8. live coding 9. conclusion 10. commercial 11. Q&A ---  ## Locust <- Python ----  ### Locust? ----  ![locust](https://upload.wikimedia.org/wikipedia/commons/thumb/2/25/Locusta-migratoria-wanderheuschrecke.jpg/1280px-Locusta-migratoria-wanderheuschrecke.jpg =800x559) ----  ### Locust? * official website: https://locust.io/ * Define user behaviour with Python code, and swarm your system with millions of simultaneous users. ----  #### framework ```graphviz digraph locust { nodesep=1.0 // increases the separation between nodes node [color="red" shape=box] edge [color="blue" style=dashed] master [label="master (coordinator)"] client1 [label="client 1...n" shape="oval"] client2 [label="client 1...n" shape="oval"] client3 [label="client 1...n" shape="oval"] master->slave1 master->slave2 master->slave3 slave1->client1 [style=solid] slave2->client2 [style=solid] slave3->client3 [style=solid] client1->server client1->server client1->server client1->server client1->server client2->server client2->server client2->server client2->server client2->server client3->server client3->server client3->server client3->server client3->server } ``` ----  #### why slave? * one client vs Google Cloud load balancer * :x: client lose * connections limitation * file descriptors limitation * many clients vs Google Cloud load balancer * :o: client may win * ==**大家一起上!**==  ----  ### usage ----  #### install ```shell pip install locustio ``` ----  run Locust distributed across multiple processes/machines ```shell pip install pyzmq ```  ----  #### code (simple) ```python= from locust import HttpLocust, TaskSet, task class WebsiteTasks(TaskSet): def on_start(self): self.client.post("/login", { "username": "test_user", "password": "" }) @task def index(self): self.client.get("/") @task def about(self): self.client.get("/about/") class WebsiteUser(HttpLocust): task_set = WebsiteTasks min_wait = 5000 max_wait = 15000 ``` ----  #### code (assign weight) ```python= from locust import HttpLocust, TaskSet, task class WebsiteTasks(TaskSet): def on_start(self): self.client.post("/login", { "username": "test_user", "password": "" }) @task(100) def index(self): self.client.get("/") @task(7) def about(self): self.client.get("/about/") class WebsiteUser(HttpLocust): task_set = WebsiteTasks min_wait = 5000 max_wait = 15000 ``` ----  #### build & run ```shell locust -f locustfile.py --host=http://example.com ``` ----  #### monitoring ![monitoring](https://locust.io/static/img/screenshot.png) ---  ## Locust -> Go ----  ### interoperability * Python? * define tasks out of the box (standalone mode) * foreign language? * ZeroMQ (master/slave mode)  ----  ```sequence locust master->locust slave: ZeroMQ: make a request note left of locust slave: log start time locust slave->server: HTTP request server->locust slave: HTTP response note left of locust slave: log end time note left of locust slave: detect response status locust slave->locust master: ZeroMQ: report status ``` ----  #### why Go? * fast  * faster  * fastest  ----  #### why Go? * server is written with Go * client bots written with Python cannot be as fast as Go ----  ### boomer * boomer: https://github.com/myzhan/boomer * Go module * load generator for Locust * be a slave * connect with Locust master via ZeroMQ * dependency: * https://github.com/zeromq/gomq ----  #### code (simple) `dummy.py` ```python= # -*- coding: utf-8 -*- from locust import Locust, TaskSet, task class MyTaskSet(TaskSet): @task(20) def hello(self): pass class Dummy(Locust): task_set = MyTaskSet ``` ----  `main.go` ```go= package main import "github.com/myzhan/boomer" import "time" func foo() { start := boomer.Now() time.Sleep(100 * time.Millisecond) elapsed := boomer.Now() - start // Report your test result as a success, if you write it in python, it will looks like this // events.request_success.fire(request_type="http", name="foo", response_time=100, response_length=10) boomer.Events.Publish("request_success", "http", "foo", elapsed, int64(10)) } ``` ----  `main.go` ```go= func bar() { start := boomer.Now() time.Sleep(100 * time.Millisecond) elapsed := boomer.Now() - start // Report your test result as a failure, if you write it in python, it will looks like this // events.request_failure.fire(request_type="udp", name="bar", response_time=100, exception=Exception("udp error")) boomer.Events.Publish("request_failure", "udp", "bar", elapsed, "udp error") } ``` ----  `main.go` ```go= func main() { task1 := &boomer.Task{ Name: "foo", Weight: 10, Fn: foo, } task2 := &boomer.Task{ Name: "bar", Weight: 20, Fn: bar, } boomer.Run(task1, task2) } ``` ----  #### finite state machine * randomized * finance * social network * \.\.\.\.\.\. etc * ordered * game ----  #### code (finite state machine) `main_seq.go` ```go= package main import "github.com/myzhan/boomer" import "time" func foobar(){ start := boomer.Now() time.Sleep(100 * time.Millisecond) elapsed := boomer.Now() - start // Report your test result as a success, if you write it in python, it will looks like this // events.request_success.fire(request_type="http", name="foo", response_time=100, response_length=10) boomer.Events.Publish("request_success", "http", "foo", elapsed, int64(10)) start = boomer.Now() time.Sleep(100 * time.Millisecond) elapsed = boomer.Now() - start // Report your test result as a failure, if you write it in python, it will looks like this // events.request_failure.fire(request_type="udp", name="bar", response_time=100, exception=Exception("udp error")) boomer.Events.Publish("request_failure", "udp", "bar", elapsed, "udp error") } ``` ----  `main_seq.go` ```go= func main(){ sequencialTask1 := &boomer.Task{ Name: "foobar1", Weight: 10, Fn: foobar, } sequencialTask2 := &boomer.Task{ Name: "foobar2", Weight: 20, Fn: foobar, } boomer.Run(sequencialTask1, sequencialTask2) } ``` ----  #### run as stand alone process (for debug) ```shell go build -o a.out main.go ./a.out --run-tasks foo,bar ``` ----  #### run as slave mode ```shell locust -f dummy.py --master --master-bind-host=127.0.0.1 --master-bind-port=5557 go build -o a.out main.go ./a.out --master-host=127.0.0.1 --master-port=5557 --rpc=zeromq ``` ---  ## play http service ----  ```go= resp, err := http.Get("http://example.com/") ... resp, err := http.Post("http://example.com/upload", "image/jpeg", &buf) ... resp, err := http.PostForm("http://example.com/form", url.Values{"key": {"Value"}, "id": {"123"}}) ``` ----  ```go= func exampleGet() { start := boomer.Now() resp, err := http.Get("https://dl.google.com/go/go1.10.3.src.tar.gz") //resp, err := http.Get("https://cache.ruby-lang.org/pub/ruby/2.5/ruby-2.5.1.tar.gz") if err == nil { func() { defer resp.Body.Close() _, err = ioutil.ReadAll(resp.Body) }() } elapsed := boomer.Now() - start if err == nil { boomer.Events.Publish("request_success", "http", "example_get", elapsed, resp.ContentLength) } else { boomer.Events.Publish("request_failure", "http", "example_get", elapsed, err.Error()) } } ``` ---  ## docker & Kubernetes ----  ### docker ----  ### docker * multiple machine * break connections limitation * break file descriptors limitation * multiple docker instance * break limitation * **easy scale**  ----  ### Kubernetes ----  ### Kubernetes * ~~kill~~ control them all!! ----  ### Kubernetes ![kubernetes](https://d33wubrfki0l68.cloudfront.net/1567471e7c58dc9b7d9c65dcd54e60cbf5870daa/a2249/images/flower.png) ----  #### kubectl scale --replicas=1 locust-slave ```graphviz digraph locust { nodesep=1.0 // increases the separation between nodes node [color="red" shape=box] edge [color="blue" style=dashed] master [label="master (coordinator)"] client1 [label="client 1...n" shape="oval"] master->slave1 slave1->client1 [style=solid] client1->server client1->server client1->server client1->server client1->server } ``` ----  #### kubectl scale --replicas=2 locust-slave ```graphviz digraph locust { nodesep=1.0 // increases the separation between nodes node [color="red" shape=box] edge [color="blue" style=dashed] master [label="master (coordinator)"] client1 [label="client 1...n" shape="oval"] client2 [label="client 1...n" shape="oval"] master->slave1 master->slave2 slave1->client1 [style=solid] slave2->client2 [style=solid] client1->server client1->server client1->server client1->server client1->server client2->server client2->server client2->server client2->server client2->server } ``` ----  #### kubectl scale --replicas=3 locust-slave ```graphviz digraph locust { nodesep=1.0 // increases the separation between nodes node [color="red" shape=box] edge [color="blue" style=dashed] master [label="master (coordinator)"] client1 [label="client 1...n" shape="oval"] client2 [label="client 1...n" shape="oval"] client3 [label="client 1...n" shape="oval"] master->slave1 master->slave2 master->slave3 slave1->client1 [style=solid] slave2->client2 [style=solid] slave3->client3 [style=solid] client1->server client1->server client1->server client1->server client1->server client2->server client2->server client2->server client2->server client2->server client3->server client3->server client3->server client3->server client3->server } ``` ---  ## live coding ----  never live coding ¯\\\_\(ツ\)\_/¯ ----  ~~never~~ live coding ( O\_o) ? ----  重新定義 "living" live coding ( @д@) ! ----  just do it ( >ω•)b ---  ## conclusion ----  > :hash: "倒站即進化" > [name=郭學聰 Hsueh-Tsung Kuo] [time=2018_08_11] [color=red] ----  ### special thanks * backend: yuxioz, bluesky * SRE: haraguroicha, hyww, mswu * QA: xible * others ---  ## commercial Sdorica -sunset- * <small>OP Animation https://youtu.be/ktGRO8tCBqs</small> * <small>Global Launch Trailer https://youtu.be/2aY7il7zuNk</small> * <small>Background Story https://youtu.be/9tOmgueeY7I</small> ----  {%youtube ktGRO8tCBqs %} ----  # Rayark Wants You ! Rayark Careers | Make A Difference * EN https://careers.rayark.com/jobs/ * ZH https://careers.rayark.com/zh/jobs/ ----  # Meet Rayark in COSCUP 攤位區 * 產品展示 * 精美小物 ---  ## Q&A --- <style> .reveal { background: #FFDFEF; color: black; } .reveal h2, .reveal h3, .reveal h4 { color: black; } .reveal code { font-size: 14px !important; line-height: 1.2; } .rightpart{ float:right; width:50%; } .leftpart{ margin-right: 50% !important; height:50%; } .reveal section img { background:none; border:none; box-shadow:none; } p.blo { font-size: 50px !important; background:#B6BDBB; border:1px solid silver; display:inline-block; padding:0.5em 0.75em; border-radius: 10px; box-shadow: 5px 5px 5px #666; } p.blo1 { background: #c7c2bb; } p.blo2 { background: #b8c0c8; } p.blo3 { background: #c7cedd; } p.bloT { font-size: 60px !important; background:#B6BDD3; border:1px solid silver; display:inline-block; padding:0.5em 0.75em; border-radius: 8px; box-shadow: 1px 2px 5px #333; } p.bloA { background: #B6BDE3; } p.bloB { background: #E3BDB3; } .slide-number{ margin-bottom:10px !important; width:100%; text-align:center; font-size:25px !important; background-color:transparent !important; } iframe.myclass{ width:100px; height:100px; bottom:0; left:0; position:fixed; border:none; z-index:99999; } h1.raw { color: #fff; background-image: linear-gradient(90deg,#f35626,#feab3a); -webkit-background-clip: text; -webkit-text-fill-color: transparent; animation: hue 5s infinite linear; } @keyframes hue { from { filter: hue-rotate(0deg); } to { filter: hue-rotate(360deg); } } .progress{ height:14px !important; } .progress span{ height:14px !important; background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAMCAIAAAAs6UAAAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAyJpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuMy1jMDExIDY2LjE0NTY2MSwgMjAxMi8wMi8wNi0xNDo1NjoyNyAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvIiB4bWxuczp4bXBNTT0iaHR0cDovL25zLmFkb2JlLmNvbS94YXAvMS4wL21tLyIgeG1sbnM6c3RSZWY9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9zVHlwZS9SZXNvdXJjZVJlZiMiIHhtcDpDcmVhdG9yVG9vbD0iQWRvYmUgUGhvdG9zaG9wIENTNiAoV2luZG93cykiIHhtcE1NOkluc3RhbmNlSUQ9InhtcC5paWQ6QUNCQzIyREQ0QjdEMTFFMzlEMDM4Qzc3MEY0NzdGMDgiIHhtcE1NOkRvY3VtZW50SUQ9InhtcC5kaWQ6QUNCQzIyREU0QjdEMTFFMzlEMDM4Qzc3MEY0NzdGMDgiPiA8eG1wTU06RGVyaXZlZEZyb20gc3RSZWY6aW5zdGFuY2VJRD0ieG1wLmlpZDpBQ0JDMjJEQjRCN0QxMUUzOUQwMzhDNzcwRjQ3N0YwOCIgc3RSZWY6ZG9jdW1lbnRJRD0ieG1wLmRpZDpBQ0JDMjJEQzRCN0QxMUUzOUQwMzhDNzcwRjQ3N0YwOCIvPiA8L3JkZjpEZXNjcmlwdGlvbj4gPC9yZGY6UkRGPiA8L3g6eG1wbWV0YT4gPD94cGFja2V0IGVuZD0iciI/PovDFgYAAAAmSURBVHjaYvjPwMAAxjMZmBhA9H8INv4P4TPM/A+m04zBNECAAQBCWQv9SUQpVgAAAABJRU5ErkJggg==") repeat-x !important; } .progress span:after, .progress span.nyancat{ content: ""; background: url('data:image/gif;base64,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') !important; width: 34px !important; height: 21px !important; border: none !important; float:right; margin-top:-7px; margin-right:-10px; } </style>

Syntax	Example	Reference
# Header	Header	基本排版
- Unordered List	Unordered List
1. Ordered List	Ordered List
- [ ] Todo List	Todo List
> Blockquote	Blockquote
Bold font	Bold font
Italics font	Italics font
~~Strikethrough~~	~~Strikethrough~~
19^th^	19^th
H~2~O	H₂O
++Inserted text++	Inserted text
==Marked text==	Marked text
[link text](https:// "title")	Link
![image alt](https:// "title")	Image
`Code`	`Code`	在筆記中貼入程式碼
```javascript var i = 0; ```	`var i = 0;`
:smile:		Emoji list
{%youtube youtube_id %}	Externals
$L^aT_eX$	L^aT_eX
:::info This is a alert area. :::	This is a alert area.