AWS Lambda

Manage serverless functions on AWS Lambda.

Environment Variables

• AWS_ACCESS_KEY_ID / AWS_SECRET_ACCESS_KEY - AWS credentials
• AWS_DEFAULT_REGION - Region (e.g. us-east-1)

List functions

aws lambda list-functions --query 'Functions[].{Name:FunctionName,Runtime:Runtime,Memory:MemorySize,Timeout:Timeout,Last:LastModified}' --output table

Get function details

aws lambda get-function --function-name my-function | jq '{Runtime: .Configuration.Runtime, Handler: .Configuration.Handler, Memory: .Configuration.MemorySize, Timeout: .Configuration.Timeout, CodeSize: .Configuration.CodeSize, Env: .Configuration.Environment.Variables}'

Invoke function

aws lambda invoke --function-name my-function \
  --payload '{"key":"value"}' \
  --cli-binary-format raw-in-base64-out \
  /tmp/lambda-out.json && cat /tmp/lambda-out.json | jq .

Invoke async

aws lambda invoke --function-name my-function \
  --invocation-type Event \
  --payload '{"key":"value"}' \
  --cli-binary-format raw-in-base64-out \
  /tmp/lambda-out.json
echo "Invoked async"

View recent logs

aws logs tail /aws/lambda/my-function --since 30m --format short

Update function code (zip)

cd /tmp/lambda-code && zip -r /tmp/function.zip . && \
aws lambda update-function-code --function-name my-function \
  --zip-file fileb:///tmp/function.zip | jq '{FunctionName, LastModified, CodeSha256}'

Update environment variables

aws lambda update-function-configuration --function-name my-function \
  --environment 'Variables={KEY1=value1,KEY2=value2}' | jq '{FunctionName, Environment}'

Update memory / timeout

aws lambda update-function-configuration --function-name my-function \
  --memory-size 512 --timeout 30 | jq '{FunctionName, MemorySize, Timeout}'

List versions / aliases

aws lambda list-versions-by-function --function-name my-function --query 'Versions[].{Version,Description,LastModified}' --output table

aws lambda list-aliases --function-name my-function --output table

Get concurrency

aws lambda get-function-concurrency --function-name my-function

Notes

• Use --cli-binary-format raw-in-base64-out for JSON payloads.
• Confirm before updating function code or configuration.
• For large deployments, use S3 bucket upload instead of zip.