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monitoring_instances.go
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/
monitoring_instances.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
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 ON or OFF
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] == "ON" {
// 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.MonitorInstancesInput{
InstanceIds: []*string{
aws.String(os.Args[2]),
},
DryRun: aws.Bool(true),
}
result, err := svc.MonitorInstances(input)
awsErr, ok := err.(awserr.Error)
// If the error code is `DryRunOperation` it means we have the necessary
// permissions to monitor this instance
if ok && awsErr.Code() == "DryRunOperation" {
// Let's now set dry run to be false. This will allow us to turn monitoring on
input.DryRun = aws.Bool(false)
result, err = svc.MonitorInstances(input)
if err != nil {
fmt.Println("Error", err)
} else {
fmt.Println("Success", result.InstanceMonitorings)
}
} else {
// This could be due to a lack of permissions
fmt.Println("Error", err)
}
} else if os.Args[1] == "OFF" { // Turn monitoring off
input := &ec2.UnmonitorInstancesInput{
InstanceIds: []*string{
aws.String(os.Args[2]),
},
DryRun: aws.Bool(true),
}
result, err := svc.UnmonitorInstances(input)
awsErr, ok := err.(awserr.Error)
if ok && awsErr.Code() == "DryRunOperation" {
input.DryRun = aws.Bool(false)
result, err = svc.UnmonitorInstances(input)
if err != nil {
fmt.Println("Error", err)
} else {
fmt.Println("Success", result.InstanceMonitorings)
}
} else {
fmt.Println("Error", err)
}
}
}