Invoke

For some reason the last argument isa file. To output to stdout use /dev/stdout

aws lambda invoke --function-name $fn /dev/stdout

Limitations

​https://docs.aws.amazon.com/lambda/latest/dg/limits.html​

Maximum of 1000 executions at a time

Execution Time

• Default is 6 seconds

  • Just change it to 30 seconds

• Maximum is 15 minutes

• When using with API Gateway, maximum is 30 seconds

• When making web requests, it is easy to pass 6 second limit

Memory

• Minimum is 128MB; goes up in 64MB increments

• Max is 3GB

• When using with Node.js and Express you have to increase to at least 192MB

Python

• Debugging is a little harder

  • For some reason, output isn’t as clean as debugging using Node.js

Debugging

• API Gateway

• Try command line

  • sls invoke local —function $f —data $d

  • aws lambda invoke —function-name $f —post

When not to use Lambda?

• You have more than 1000 concurrent connections

• When you have predictable traffic

• You need something that lasts longer than 15minutes

• The latency to fire has to be fast

• The deployed code is larger than 50mb

Why I like lambda (or faas in general)

I can treat it as a script that doesn’t have a dependency on my computer

Prototype Projects

• ​URL Shortener​

• ​Serverless Prototypes​

• ​build.my or https://github.com/aizatto/build.my​