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Use PrivateDnsName as Node name in nodeadm
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| package api | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "time" | ||
|
|
||
| "github.com/aws/aws-sdk-go-v2/feature/ec2/imds" | ||
| "github.com/aws/aws-sdk-go-v2/service/ec2" | ||
| "github.com/aws/aws-sdk-go/aws" | ||
| ec2extra "github.com/awslabs/amazon-eks-ami/nodeadm/internal/aws/ec2" | ||
| ) | ||
|
|
||
| // Fetch information about the ec2 instance using IMDS data. | ||
| // This information is stored into the internal config to avoid redundant calls | ||
| // to IMDS when looking for instance metadata | ||
| func GetInstanceDetails(ctx context.Context, imdsClient *imds.Client, ec2Client *ec2.Client) (*InstanceDetails, error) { | ||
| instanceIdenitityDocument, err := imdsClient.GetInstanceIdentityDocument(ctx, &imds.GetInstanceIdentityDocumentInput{}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| macResponse, err := imdsClient.GetMetadata(ctx, &imds.GetMetadataInput{Path: "mac"}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| mac, err := io.ReadAll(macResponse.Content) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| privateDNSName, err := getPrivateDNSName(ec2Client, instanceIdenitityDocument.InstanceID) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &InstanceDetails{ | ||
| ID: instanceIdenitityDocument.InstanceID, | ||
| Region: instanceIdenitityDocument.Region, | ||
| Type: instanceIdenitityDocument.InstanceType, | ||
| AvailabilityZone: instanceIdenitityDocument.AvailabilityZone, | ||
| MAC: string(mac), | ||
| PrivateDNSName: privateDNSName, | ||
| }, nil | ||
| } | ||
|
|
||
| const privateDNSNameAvailableTimeout = 3 * time.Minute | ||
|
|
||
| // GetPrivateDNSName returns this instance's private DNS name as reported by the EC2 API, waiting until it's available if necessary. | ||
| func getPrivateDNSName(ec2Client *ec2.Client, instanceID string) (string, error) { | ||
| w := ec2extra.NewInstanceConditionWaiter(ec2Client, privateDNSNameAvailable, func(opts *ec2extra.InstanceConditionWaiterOptions) { | ||
| opts.LogWaitAttempts = true | ||
| }) | ||
| out, err := w.WaitForOutput(context.TODO(), &ec2.DescribeInstancesInput{InstanceIds: []string{instanceID}}, privateDNSNameAvailableTimeout) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| privateDNSName := aws.StringValue(out.Reservations[0].Instances[0].PrivateDnsName) | ||
| return privateDNSName, nil | ||
| } | ||
|
|
||
| func privateDNSNameAvailable(out *ec2.DescribeInstancesOutput) (bool, error) { | ||
| if out == nil || len(out.Reservations) != 1 || len(out.Reservations[0].Instances) != 1 { | ||
| return false, fmt.Errorf("reservation or instance not found") | ||
| } | ||
| return aws.StringValue(out.Reservations[0].Instances[0].PrivateDnsName) != "", nil | ||
| } |
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