Ec2 Creation with Lambda via Golang

createInstance.go

package main

import (
	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/session"
	"github.com/aws/aws-sdk-go/service/ec2"
	"github.com/aws/aws-lambda-go/lambda"

	"fmt"
	"os"
	"log"
)

func createInstance() {

	// Get credentials from ~/.aws/credentials
	sess, err := session.NewSession(&aws.Config{
		Region: aws.String("us-west-2")},
	)

	// Create EC2 service client
	svc := ec2.New(sess)

	// Specify the details of the instance that you want to create
	runResult, err := svc.RunInstances(&ec2.RunInstancesInput{
		ImageId:      aws.String(os.Getenv("AMI")),
		InstanceType: aws.String(os.Getenv("INSTANCE_TYPE")),
		MinCount:     aws.Int64(1),
		MaxCount:     aws.Int64(1),
		SecurityGroupIds: aws.StringSlice([]string{os.Getenv("SECURITY_GROUP")}),
		KeyName: aws.String(os.Getenv("KEYNAME")),
		SubnetId:     aws.String(os.Getenv("SUBNET_ID")),
	})

	if err != nil {
		fmt.Println("Could not create instance", err)
		return
	}

	fmt.Println("Created instance", *runResult.Instances[0].InstanceId)

	// Add tags to the created instance
	_, errtag := svc.CreateTags(&ec2.CreateTagsInput{
		Resources: []*string{runResult.Instances[0].InstanceId},
		Tags: []*ec2.Tag{
			{
				Key:   aws.String("Name"),
				Value: aws.String("GoInstance"),
			},
		},
	})
	if errtag != nil {
		log.Println("Could not create tags for instance", runResult.Instances[0].InstanceId, errtag)
		return
	}

	fmt.Println("Successfully tagged instance")
}

func main() {
	lambda.Start(createInstance)
}