Serverless Framework

serverless.com

Install

安裝serverless

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npm install serverless -g

確認是否安裝完成

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serverless -v

Create serverless project

透過 serverless create --help 查看指令功能、支援的樣板

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> serverless create --help
Plugin: Create
create ........................ Create new Serverless service
    --template / -t .................... Template for the service. Available templates: "aws-clojure-gradle", "aws-clojurescript-gradle", "aws-nodejs", "aws-nodejs-typescript", "aws-alexa-typescript",
"aws-nodejs-ecma-script", "aws-python", "aws-python3", "aws-groovy-gradle", "aws-java-maven", "aws-java-gradle", "aws-kotlin-jvm-maven", "aws-kotlin-jvm-gradle", "aws-kotlin-nodejs-gradle", "aws-scala-sbt", "aws-csharp", "aws-fsharp", "aws-go", "aws-go-dep", "aws-go-mod", "aws-ruby", "azure-nodejs", "cloudflare-workers", "cloudflare-workers-enterprise", "fn-nodejs", "fn-go", "google-nodejs", "google-go", "kubeless-python", "kubeless-nodejs", "openwhisk-java-maven", "openwhisk-nodejs", "openwhisk-php", "openwhisk-python", "openwhisk-ruby", "openwhisk-swift", "spotinst-nodejs", "spotinst-python", "spotinst-ruby", "spotinst-java8", "plugin" and "hello-world"
    --template-url / -u ................ Template URL for the service. Supports: GitHub, BitBucket
    --template-path .................... Template local path for the service.
    --path / -p ........................ The path where the service should be created (e.g. --path my-service)
    --name / -n ........................ Name for the service. Overwrites the default name of the created service.

依照個人喜好選擇serverless language template : 這邊我選擇nodejs

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serverless create -t aws-nodejs --name serverless-demo

Set aws config

可以透過aws cli或serverless config credentials來進行設定aws環境
兩者皆會在你目前使用者目錄下建立 ~/.aws/credentials

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> aws configure
   AWS Access Key ID [****]:
   AWS Secret Access Key [****]:
   Default region name [us-west-1]: us-west-2
   Default output format [None]:

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> serverless config credentials -k [your_iam_key] -s [your_iam_secret]

aws cli install

Deploy

將目前的nodejs程式發佈到aws環境
自動將所需要的設定一次部屬完成
若你有更新程式碼
也是同樣用deploy指令進行部屬更新

deploy = delete old code + create new code aws部屬相關東西 : CloudFormation, Lambda, Cloudwatch, S3, IAM …

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serverless deploy -v

部屬完成後會得到下列訊息

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Serverless: Stack update finished...
Service Information
service: serverless-demo
stage: dev
region: us-east-1
stack: serverless-demo-dev
api keys:
  None
endpoints:
  None
functions:
  hello: serverless-demo-dev-hello
layers:
  None

Stack Outputs
HelloLambdaFunctionQualifiedArn: arn:aws:lambda:us-east-1:994755830156:function:serverless-demo-dev-hello:1
ServerlessDeploymentBucketName: serverless-demo-dev-serverlessdeploymentbucket-1rht7cwa1sw7l

Test by inovke

測試你部屬的程式是否運作正常

Online test

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> serverless invoke -f hello -d '{"key3": "value3","key2": "value2","key1": "value1"}'
{
    "statusCode": 200,
    "body": "{\"message\":\"Go Serverless v1.0! Your function executed successfully!\",\"input\":\"{key3: value3,key2: value2,key1: value1}\"}"
}

Local test

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> serverless invoke local -f hello -d '{"key3": "value3","key2": "value2","key1": "value1"}'

Remove

如果你覺得serverless專案不要了
也可以透過remove方法一鍵移除環境

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> serverless remove

若沒有這個東西，傳統清理aws demo環境方法真的痛苦
要一個一個來，還怕哪邊沒清乾淨然後產生莫名的費用
(lambda, s3, cloudwatch, cloudformation…)

Summary

想寫這篇文章想很久了
剛好最近過年有空來研究一下
一開始像無頭蒼蠅那樣找資料
然後去AWS Lambda試老半天
有弄出一些成果
但部屬架設流程不是我想像中那麼順暢
(AWS Console 部屬真的很痛苦…)
後來得知serverless.com的工具後
部屬設定變簡單了
可以專注在核心程式上
這才達到serverless核心開發理念
其實現在有蠻多serverless部屬工具 :
serverless, SAM, Up …
選擇適合自己的serverless工具可以事半功倍

Reference