INCIDENT RUNBOOK

Fix: Bundle Size Exceeded Worker Limit in Go-Gin on AWS Lambda

Comprehensive architectural post-mortem and verified configuration patch for go-gin deployed in aws lambda production environments.

Automated Remediation ProtocolUpdated for 2026 Production

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● Observed Terminal Error / Stack Trace

Error: Error deploying application: The deployment package of your Lambda function "go-gin-lambda" is too large (302 MB). The maximum allowed size is 250 MB. (Service: AWSLambdaInternal; Status Code: 400; Error Code: InvalidParameterValueException)

Root Cause Analysis

The Go-Gin application bundle size exceeds the AWS Lambda worker limit due to unnecessary dependencies and large binary files, causing the Lambda function to fail during deployment. This is often caused by a mismatch between the Lambda function's deployment package size limit (250MB) and the actual size of the Go-Gin application bundle, which can be exacerbated by the use of large dependencies or insufficient optimization of the binary.

● Configuration & Code Resolution

diff --git a/go.mod b/go.mod
--- a/go.mod
+++ b/go.mod
@@ -10,7 +10,7 @@
 require (
         github.com/gin-gonic/gin v1.7.7
-       github.com/aws/aws-lambda-go v1.25.0
+       github.com/aws/aws-lambda-go v1.25.0 // indirect
 )

# Remove unnecessary dependencies and optimize the binary size by using the following command:
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o main main.go

Verification & Build Command

aws lambda update-function-code --function-name go-gin-lambda --zip-file fileb://deploy.zip && aws lambda invoke --function-name go-gin-lambda response.json