aws lambda使用
Before getting started with lambda setup lets take a look at our use case and how we landed on serverless as a solution to our problem .
在开始使用lambda设置之前，让我们看一下用例以及如何使用无服务器作为解决问题的方法。
Problem statement :- Every product has its website and so did ours but it wasn’t accessed very frequently as majority of our traffic was on the mobile application , but sometimes we witnessed traffic surge .
问题陈述：-每个产品都有其网站，我们的网站也有它的网站，但是由于我们的大部分流量是通过移动应用程序进行的，因此它的访问频率并不高，但是有时我们目睹了流量的激增。
Solution :- To serve the Rest APIs required by the website , provisioning a server was not the best solution as it would require more maintenance and we had to pay even if there was no traffic
解决方案：-为了满足网站所需的Rest API，配置服务器不是最佳解决方案，因为它将需要更多维护，即使没有流量，我们也必须付费
[ENTER SERVERLESS]
[无服务器]
Using serverless functions we could easily serve the needs of the website without worrying much about the provisioning , maintenance of the server and also paying only for what we use
使用无服务器功能，我们可以轻松满足网站的需求，而不必担心服务器的配置，维护以及仅为使用的服务器付费
Summary :- This is why we chose serveless as a solution to our problem but this is not the case every time as lambda itself has some drawbacks and in a few cases provisioning a server is better , so choose wisely
简介：-这就是为什么我们选择“无用”作为解决问题的原因，但并非每次Lambda本身都有一些缺点，并且在某些情况下配置服务器更好的情况下并非如此，因此请明智地选择
To build a serverless backend you’ll need ,
要构建无服务器后端，您需要，
A lambda function Lambda函数 An API gateway (to trigger lambda function) API网关(触发lambda函数)Some IAM Stuff (https://docs.aws.amazon.com/lambda/latest/dg/lambda-permissions.html)
一些IAM资料( https://docs.aws.amazon.com/lambda/latest/dg/lambda-permissions.html )
Made by me on onenote 我在onenote上制作的Setting up aws lambda is very easy , all you need is good code . You can find awesome guides on getting started with serverless and that should help you set up a basic “ hello world “ function . I’ve listed down a few steps incase you need them
设置aws lambda非常容易，您只需要好的代码。 您可以找到有关无服务器入门的出色指南，这些指南应有助于您建立基本的“ hello world”功能。 我列出了一些步骤，以防您需要
these steps are too simple 这些步骤太简单了And here is a sample serverless.yml file to define your function
这是一个示例serverless.yml文件，用于定义您的功能
service: demo-service provider: name: aws runtime: nodejs12.x stage: dev region: ap-south-1 functions: webApp: handler: handler.index events: - http: ANY / - http: 'ANY {proxy +}'But wait , you don’t run “ hello world “ in production ? The basic example has some drawbacks if you're running it in production
但是，等等，您不在生产中运行“ hello world”吗？ 如果您在生产环境中运行基本示例，则存在一些缺陷
You need to zip the code every time and update it through the lambda console , which is not considered a very good practice 您每次都需要压缩代码并通过lambda控制台对其进行更新，这不是很好的做法 If you’ve multiple event triggers , you’ll have to set them up and update them manually 如果您有多个事件触发器，则必须对其进行设置并手动更新Sam is a service provided by AWS to deploy serverless applications with ease , Sam takes care of provisioning and updating every service related to the service definition . SAM is basically a wrapper around Cloudformation , if you’ve used that , Also it makes local development a lot easy . All you need is a template.yml file.
Sam是AWS提供的一项服务，用于轻松部署无服务器应用程序，Sam负责配置和更新与服务定义相关的每项服务。 SAM基本上是Cloudformation的包装，如果您使用过SAM，那么它也使本地开发变得非常容易。 您只需要一个template.yml文件。
AWSTemplateFormatVersion: '2010-09-09' Transform: AWS::Serverless-2016-10-31 #this defines that is a SAM template Description: > # Description Sample lambda server SAM Template for lambda-api-gateway Resources: # Resources that this SAM wil configure it can contain (API gateway definition,Lambda and many more) WebsiteLambda: Type: AWS::Serverless::Function Properties: CodeUri: ./package #this is where my code is Handler: index.handler # {EntryFile}.{HandlerFunction} Runtime: nodejs12.x Timeout : 5 #Optional Role : lambda-arn #Role required by your function,if not provided SAM will create one for you Environment: #ENV variables Variables: NODE_ENV: staging LAMBDA : false Events: # trigger events WebsiteApi: Type: Api # API-> API gateway Properties: Path: /{proxy+} # wildcard for accept anything Method: any # ANY method Outputs: #Outputs of the sam template WebsiteLambdaAPI: Description: "API Gateway endpoint URL for website function" Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/" WebsiteLambda: Description: "website lambda function" Value: !GetAtt WebsiteLambda.ArnAnd now you can use simple commands to deploy , test your function . Before starting make sure you’ve properly configure AWS-cli with proper roles
现在，您可以使用简单的命令来部署，测试功能。 在开始之前，请确保已正确配置具有适当角色的AWS-cli
Build 建立 sam build Deploy 部署 sam deploy --guided Test 测试 sam local invoketo test using the api gateway
使用api网关进行测试
sam local start-apiGetting started with sam might take a while if you’re not familiar with cloudformation , but it’ll make developing and deploying lambda easier
如果您不熟悉cloudformation，可能需要一段时间才能开始使用sam，但这会使lambda的开发和部署更加容易
You cannot access the Internet from Lambda , for that you’ll need to add a NAT gateway to your VPC
您无法从Lambda访问Internet，因为您需要向VPC添加NAT网关
If you want to access RDS from lambda , it is highly recommended that you use RDS Proxy (https://aws.amazon.com/rds/proxy/) to connect to database . RDS Proxy will manage a pool of warm connections so that when functions scale , they do not overload your db by eating up all the connections also make sure your lambda is in the same VPC .
如果要从lambda访问RDS，强烈建议您使用RDS代理( https://aws.amazon.com/rds/proxy/ )连接到数据库。 RDS代理将管理一个热连接池，以便在函数扩展时，它们不会通过耗尽所有连接来使您的数据库过载，并且还要确保您的lambda位于同一VPC中。
to access s3 from lambda , you need to add a VPC Endpoint (https://docs.aws.amazon.com/vpc/latest/userguide/vpce-gateway.html) to s3 in your VPC , you cannot directly access s3 from lambda
要从lambda访问s3，您需要将VPC端点( https://docs.aws.amazon.com/vpc/latest/userguide/vpce-gateway.html )添加到VPC中的s3，您不能直接从拉姆达
Now since we’re ready with our setup , its time to write some code . See you in the follow up article . Feel free to drop a question or a feedback below :)
现在，既然我们已经准备好设置，就该写一些代码了。 在后续文章中见。 请在下面随意提出问题或反馈：)
Part 0 :
第0部分：
翻译自: https://medium.com/swlh/using-aws-lambda-1-setup-820f794d4d1c
aws lambda使用
