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start_stop_instances.go

Starts and stops an Amazon EC2 instance.

/* Copyright 2010-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved. This file is licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance with the License. A copy of the License is located at http://aws.amazon.com/apache2.0/ This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ package main import ( "fmt" "os" "github.com/aws/aws-sdk-go/aws" "github.com/aws/aws-sdk-go/aws/awserr" "github.com/aws/aws-sdk-go/aws/session" "github.com/aws/aws-sdk-go/service/ec2" ) // Usage: // go run main.go <state> <instance id> // * state can either be START or STOP func main() { // Load session from shared config sess := session.Must(session.NewSessionWithOptions(session.Options{ SharedConfigState: session.SharedConfigEnable, })) // Create new EC2 client svc := ec2.New(sess) // Turn monitoring on if os.Args[1] == "START" { // We set DryRun to true to check to see if the instance exists and we have the // necessary permissions to monitor the instance. input := &ec2.StartInstancesInput{ InstanceIds: []*string{ aws.String(os.Args[2]), }, DryRun: aws.Bool(true), } result, err := svc.StartInstances(input) awsErr, ok := err.(awserr.Error) // If the error code is `DryRunOperation` it means we have the necessary // permissions to Start this instance if ok && awsErr.Code() == "DryRunOperation" { // Let's now set dry run to be false. This will allow us to start the instances input.DryRun = aws.Bool(false) result, err = svc.StartInstances(input) if err != nil { fmt.Println("Error", err) } else { fmt.Println("Success", result.StartingInstances) } } else { // This could be due to a lack of permissions fmt.Println("Error", err) } } else if os.Args[1] == "STOP" { // Turn instances off input := &ec2.StopInstancesInput{ InstanceIds: []*string{ aws.String(os.Args[2]), }, DryRun: aws.Bool(true), } result, err := svc.StopInstances(input) awsErr, ok := err.(awserr.Error) if ok && awsErr.Code() == "DryRunOperation" { input.DryRun = aws.Bool(false) result, err = svc.StopInstances(input) if err != nil { fmt.Println("Error", err) } else { fmt.Println("Success", result.StoppingInstances) } } else { fmt.Println("Error", err) } } }

Sample Details

Service: ec2

Last tested: 2018-03-16

Author: Doug-AWS

Type: full-example

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