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create_enable_alarms.go
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/
create_enable_alarms.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
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/cloudwatch"
"fmt"
"os"
)
func main() {
if len(os.Args) != 4 {
fmt.Println("You must supply an instance name, value, and alarm name")
os.Exit(1)
}
instance := os.Args[1]
value := os.Args[2]
name := os.Args[3]
// Initialize a session that the SDK uses to load
// credentials from the shared credentials file ~/.aws/credentials
// and configuration from the shared configuration file ~/.aws/config.
sess := session.Must(session.NewSessionWithOptions(session.Options{
SharedConfigState: session.SharedConfigEnable,
}))
// Create new CloudWatch client.
svc := cloudwatch.New(sess)
// Create a metric alarm that reboots an instance if its CPU utilization is
// greater than 70.0%.
_, err := svc.PutMetricAlarm(&cloudwatch.PutMetricAlarmInput{
AlarmName: aws.String(name),
ComparisonOperator: aws.String(cloudwatch.ComparisonOperatorGreaterThanThreshold),
EvaluationPeriods: aws.Int64(1),
MetricName: aws.String("CPUUtilization"),
Namespace: aws.String("AWS/EC2"),
Period: aws.Int64(60),
Statistic: aws.String(cloudwatch.StatisticAverage),
Threshold: aws.Float64(70.0),
ActionsEnabled: aws.Bool(true),
AlarmDescription: aws.String("Alarm when server CPU exceeds 70%"),
Unit: aws.String(cloudwatch.StandardUnitSeconds),
// This is apart of the default workflow actions. This one will reboot the instance, if the
// alarm is triggered.
AlarmActions: []*string{
aws.String(fmt.Sprintf("arn:aws:swf:us-east-1:%s:action/actions/AWS_EC2.InstanceId.Reboot/1.0", instance)),
},
Dimensions: []*cloudwatch.Dimension{
{
Name: aws.String("InstanceId"),
Value: aws.String(value),
},
},
})
if err != nil {
fmt.Println("Error", err)
return
}
// This will enable the alarm to our instance.
result, err := svc.EnableAlarmActions(&cloudwatch.EnableAlarmActionsInput{
AlarmNames: []*string{
aws.String(name),
},
})
if err != nil {
fmt.Println("Error", err)
return
}
fmt.Println("Alarm action enabled", result)
}