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ec2_release_address.go
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/
ec2_release_address.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"
"path/filepath"
"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"
)
// Releases an Elastic IP address allocation ID. If the address is associated
// with a EC2 instance the association will be removed.
//
// Usage:
//
// go run ec2_release_address.go ALLOCATION_ID
func main() {
if len(os.Args) != 2 {
exitErrorf("allocation ID required\nUsage: %s allocation_id",
filepath.Base(os.Args[0]))
}
allocationID := os.Args[1]
// Initialize a session in us-west-2 that the SDK will use to load
// credentials from the shared credentials file ~/.aws/credentials.
sess, err := session.NewSession(&aws.Config{
Region: aws.String("us-west-2")},
)
// Create an EC2 service client.
svc := ec2.New(sess)
// Attempt to release the Elastic IP address.
_, err = svc.ReleaseAddress(&ec2.ReleaseAddressInput{
AllocationId: aws.String(allocationID),
})
if err != nil {
if aerr, ok := err.(awserr.Error); ok && aerr.Code() == "InvalidAllocationID.NotFound" {
exitErrorf("Allocation ID %s does not exist", allocationID)
}
exitErrorf("Unable to release IP address for allocation %s, %v",
allocationID, err)
}
fmt.Printf("Successfully released allocation ID %s\n", allocationID)
}
func exitErrorf(msg string, args ...interface{}) {
fmt.Fprintf(os.Stderr, msg+"\n", args...)
os.Exit(1)
}