Manage object lifecycles

Overview Configuration samples

This page describes how to set Object Lifecycle Management on a bucket and how to view a bucket's current lifecycle configuration. Lifecycle configurations apply to all current and future objects in the bucket.

Required roles

To get the permissions that you need to set and manage Object Lifecycle Management for a bucket, ask your administrator to grant you the Storage Admin (roles/storage.admin) role on the bucket. This predefined role contains the permissions required to set and manage Object Lifecycle Management for a bucket. To see the exact permissions required, expand the Required permissions section:

Required permissions

  • storage.buckets.get
  • storage.buckets.list
    • This permission is only required if you plan on using the Google Cloud console to perform the instructions on this page.
  • storage.buckets.update

You might also be able to get these permissions with custom roles.

For information about granting roles on buckets, see Set and manage IAM policies on buckets.

Set the lifecycle configuration for a bucket

Console

  1. In the Google Cloud console, go to the Cloud Storage Buckets page.

    Go to Buckets

  2. In the bucket list, find the bucket you want to enable, and click the bucket's name.

  3. Click the Lifecycle tab.

    The lifecycle rules page appears. From here you can edit or delete existing rules. To add a new rule:

  4. Click Add a rule.

  5. In the page that appears, specify a configuration.

    1. Select the action to take when an object meets the conditions.

    2. Click Continue.

    3. Select the conditions under which an action is taken.

    4. Click Continue.

    5. Click Create.

To learn how to get detailed error information about failed Cloud Storage operations in the Google Cloud console, see Troubleshooting.

Command line

  1. Create a JSON file with the lifecycle configuration rules you would like to apply. See configuration examples for sample JSON files.

  2. Use the gcloud storage buckets update command with the --lifecycle-file flag:

    gcloud storage buckets update gs://BUCKET_NAME --lifecycle-file=LIFECYCLE_CONFIG_FILE

    Where:

    • BUCKET_NAME is the name of the relevant bucket. For example, my-bucket.
    • LIFECYCLE_CONFIG_FILE is the path for the JSON file that you created in Step 1.

Client libraries

C++

For more information, see the Cloud Storage C++ API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample sets a lifecycle configuration on a bucket:

namespace gcs = ::google::cloud::storage; using ::google::cloud::StatusOr; [](gcs::Client client, std::string const& bucket_name) {  gcs::BucketLifecycle bucket_lifecycle_rules = gcs::BucketLifecycle{  {gcs::LifecycleRule(gcs::LifecycleRule::ConditionConjunction(  gcs::LifecycleRule::MaxAge(30),  gcs::LifecycleRule::IsLive(true)),  gcs::LifecycleRule::Delete())}};  StatusOr<gcs::BucketMetadata> updated_metadata = client.PatchBucket(  bucket_name,  gcs::BucketMetadataPatchBuilder().SetLifecycle(bucket_lifecycle_rules));  if (!updated_metadata) throw std::move(updated_metadata).status();  if (!updated_metadata->has_lifecycle() ||  updated_metadata->lifecycle().rule.empty()) {  std::cout << "Bucket lifecycle management is not enabled for bucket "  << updated_metadata->name() << ".\n";  return;  }  std::cout << "Successfully enabled bucket lifecycle management for bucket "  << updated_metadata->name() << ".\n";  std::cout << "The bucket lifecycle rules are";  for (auto const& kv : updated_metadata->lifecycle().rule) {  std::cout << "\n " << kv.condition() << ", " << kv.action();  }  std::cout << "\n"; }

The following sample removes any existing lifecycle configuration from on a bucket:

namespace gcs = ::google::cloud::storage; using ::google::cloud::StatusOr; [](gcs::Client client, std::string const& bucket_name) {  StatusOr<gcs::BucketMetadata> updated_metadata = client.PatchBucket(  bucket_name, gcs::BucketMetadataPatchBuilder().ResetLifecycle());  if (!updated_metadata) throw std::move(updated_metadata).status();  std::cout << "Successfully disabled bucket lifecycle management for bucket "  << updated_metadata->name() << ".\n"; }

C#

For more information, see the Cloud Storage C# API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample sets a lifecycle configuration on a bucket:

 using Google.Apis.Storage.v1.Data; using Google.Cloud.Storage.V1; using System; using System.Collections.Generic; public class EnableBucketLifecycleManagementSample {  public Bucket EnableBucketLifecycleManagement(string bucketName = "your-unique-bucket-name")  {  var storage = StorageClient.Create();  var bucket = storage.GetBucket(bucketName);  bucket.Lifecycle = new Bucket.LifecycleData  {  Rule = new List<Bucket.LifecycleData.RuleData>  {  new Bucket.LifecycleData.RuleData  {  Condition = new Bucket.LifecycleData.RuleData.ConditionData { Age = 100 },  Action = new Bucket.LifecycleData.RuleData.ActionData { Type = "Delete" }  }  }  };  bucket = storage.UpdateBucket(bucket);  Console.WriteLine($"Lifecycle management is enabled for bucket {bucketName} and the rules are:");  foreach (var rule in bucket.Lifecycle.Rule)  {  Console.WriteLine("Action:");  Console.WriteLine($"Type: {rule.Action.Type}");  Console.WriteLine($"Storage Class: {rule.Action.StorageClass}");  Console.WriteLine("Condition:");  Console.WriteLine($"Age: \t{rule.Condition.Age}");  Console.WriteLine($"Created Before: \t{rule.Condition.CreatedBefore}");  Console.WriteLine($"Time Before: \t{rule.Condition.CustomTimeBefore}");  Console.WriteLine($"Days Since Custom Time: \t{rule.Condition.DaysSinceCustomTime}");  Console.WriteLine($"Days Since Non-current Time: \t{rule.Condition.DaysSinceNoncurrentTime}");  Console.WriteLine($"IsLive: \t{rule.Condition.IsLive}");  Console.WriteLine($"Storage Class: \t{rule.Condition.MatchesStorageClass}");  Console.WriteLine($"Noncurrent Time Before: \t{rule.Condition.NoncurrentTimeBefore}");  Console.WriteLine($"Newer Versions: \t{rule.Condition.NumNewerVersions}");  }  return bucket;  } }

The following sample removes any existing lifecycle configuration from on a bucket:

 using Google.Apis.Storage.v1.Data; using Google.Cloud.Storage.V1; using System; public class DisableBucketLifecycleManagementSample {  public Bucket DisableBucketLifecycleManagement(string bucketName = "your-unique-bucket-name")  {  var storage = StorageClient.Create();  var bucket = storage.GetBucket(bucketName);  bucket.Lifecycle = null;  bucket = storage.UpdateBucket(bucket);  Console.WriteLine($"Lifecycle management is disabled for bucket {bucketName}.");  return bucket;  } }

Go

For more information, see the Cloud Storage Go API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample sets a lifecycle configuration on a bucket:

import ( "context" "fmt" "io" "time" "cloud.google.com/go/storage" ) // enableBucketLifecycleManagement adds a lifecycle delete rule with the // condition that the object is 100 days old. func enableBucketLifecycleManagement(w io.Writer, bucketName string) error { // bucketName := "bucket-name" ctx := context.Background() client, err := storage.NewClient(ctx) if err != nil { return fmt.Errorf("storage.NewClient: %w", err) } defer client.Close() ctx, cancel := context.WithTimeout(ctx, time.Second*10) defer cancel() bucket := client.Bucket(bucketName) bucketAttrsToUpdate := storage.BucketAttrsToUpdate{ Lifecycle: &storage.Lifecycle{ Rules: []storage.LifecycleRule{ { Action: storage.LifecycleAction{Type: "Delete"}, Condition: storage.LifecycleCondition{ AgeInDays: 100, }, }, }, }, } attrs, err := bucket.Update(ctx, bucketAttrsToUpdate) if err != nil { return fmt.Errorf("Bucket(%q).Update: %w", bucketName, err) } fmt.Fprintf(w, "Lifecycle management is enabled for bucket %v\n and the rules are:\n", bucketName) for _, rule := range attrs.Lifecycle.Rules { fmt.Fprintf(w, "Action: %v\n", rule.Action) fmt.Fprintf(w, "Condition: %v\n", rule.Condition) } return nil }

The following sample removes any existing lifecycle configuration from on a bucket:

import ( "context" "fmt" "io" "time" "cloud.google.com/go/storage" ) // disableBucketLifecycleManagement removes all existing lifecycle rules // from the bucket. func disableBucketLifecycleManagement(w io.Writer, bucketName string) error { // bucketName := "bucket-name" ctx := context.Background() client, err := storage.NewClient(ctx) if err != nil { return fmt.Errorf("storage.NewClient: %w", err) } defer client.Close() ctx, cancel := context.WithTimeout(ctx, time.Second*10) defer cancel() bucket := client.Bucket(bucketName) bucketAttrsToUpdate := storage.BucketAttrsToUpdate{ Lifecycle: &storage.Lifecycle{}, } _, err = bucket.Update(ctx, bucketAttrsToUpdate) if err != nil { return fmt.Errorf("Bucket(%q).Update: %w", bucketName, err) } fmt.Fprintf(w, "Lifecycle management is disabled for bucket %v.\n", bucketName) return nil }

Java

For more information, see the Cloud Storage Java API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample sets a lifecycle configuration on a bucket:

import static com.google.cloud.storage.BucketInfo.LifecycleRule.LifecycleAction; import static com.google.cloud.storage.BucketInfo.LifecycleRule.LifecycleCondition; import com.google.cloud.storage.Bucket; import com.google.cloud.storage.BucketInfo.LifecycleRule; import com.google.cloud.storage.Storage; import com.google.cloud.storage.StorageOptions; import com.google.common.collect.ImmutableList; public class EnableLifecycleManagement {  public static void enableLifecycleManagement(String projectId, String bucketName) {  // The ID of your GCP project  // String projectId = "your-project-id";  // The ID of your GCS bucket  // String bucketName = "your-unique-bucket-name";  Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();  Bucket bucket = storage.get(bucketName);  // See the LifecycleRule documentation for additional info on what you can do with lifecycle  // management rules. This one deletes objects that are over 100 days old.  // https://googleapis.dev/java/google-cloud-clients/latest/com/google/cloud/storage/BucketInfo.LifecycleRule.html  bucket.toBuilder()  .setLifecycleRules(  ImmutableList.of(  new LifecycleRule(  LifecycleAction.newDeleteAction(),  LifecycleCondition.newBuilder().setAge(100).build())))  .build()  .update();  System.out.println("Lifecycle management was enabled and configured for bucket " + bucketName);  } }

The following sample removes any existing lifecycle configuration from on a bucket:

import com.google.cloud.storage.Bucket; import com.google.cloud.storage.Storage; import com.google.cloud.storage.Storage.BucketTargetOption; import com.google.cloud.storage.StorageOptions; public class DisableLifecycleManagement {  public static void disableLifecycleManagement(String projectId, String bucketName) {  // The ID of your GCP project  // String projectId = "your-project-id";  // The ID of your GCS bucket  // String bucketName = "your-unique-bucket-name";  Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();  // first look up the bucket, so we will have its metageneration  Bucket bucket = storage.get(bucketName);  storage.update(  bucket.toBuilder().deleteLifecycleRules().build(),  BucketTargetOption.metagenerationMatch());  System.out.println("Lifecycle management was disabled for bucket " + bucketName);  } }

Node.js

For more information, see the Cloud Storage Node.js API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample sets a lifecycle configuration on a bucket:

/**  * TODO(developer): Uncomment the following lines before running the sample.  */ // The ID of your GCS bucket // const bucketName = 'your-unique-bucket-name'; // Imports the Google Cloud client library const {Storage} = require('@google-cloud/storage'); // Creates a client const storage = new Storage(); async function enableBucketLifecycleManagement() {  const [metadata] = await storage.bucket(bucketName).addLifecycleRule({  action: {  type: 'Delete',  },  condition: {age: 100},  });  console.log(  `Lifecycle management is enabled for bucket ${bucketName} and the rules are:`  );  console.log(metadata.lifecycle.rule); } enableBucketLifecycleManagement().catch(console.error);

The following sample removes any existing lifecycle configuration from on a bucket:

/**  * TODO(developer): Uncomment the following lines before running the sample.  */ // The ID of your GCS bucket // const bucketName = 'your-unique-bucket-name'; // Imports the Google Cloud client library const {Storage} = require('@google-cloud/storage'); // Creates a client const storage = new Storage(); async function disableBucketLifecycleManagement() {  await storage.bucket(bucketName).setMetadata({lifecycle: null});  console.log(`Lifecycle management is disabled for bucket ${bucketName}`); } disableBucketLifecycleManagement().catch(console.error);

PHP

For more information, see the Cloud Storage PHP API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample sets a lifecycle configuration on a bucket:

use Google\Cloud\Storage\StorageClient; use Google\Cloud\Storage\Bucket; /**  * Enable bucket lifecycle management.  *  * @param string $bucketName The name of your Cloud Storage bucket.  * (e.g. 'my-bucket')  */ function enable_bucket_lifecycle_management(string $bucketName): void {  $storage = new StorageClient();  $bucket = $storage->bucket($bucketName);  $lifecycle = Bucket::lifecycle()  ->addDeleteRule([  'age' => 100  ]);  $bucket->update([  'lifecycle' => $lifecycle  ]);  $lifecycle = $bucket->currentLifecycle();  printf('Lifecycle management is enabled for bucket %s and the rules are:' . PHP_EOL, $bucketName);  foreach ($lifecycle as $rule) {  print_r($rule);  print(PHP_EOL);  } }

The following sample removes any existing lifecycle configuration from on a bucket:

use Google\Cloud\Storage\StorageClient; /**  * Disable bucket lifecycle management.  *  * @param string $bucketName The name of your Cloud Storage bucket.  * (e.g. 'my-bucket')  */ function disable_bucket_lifecycle_management(string $bucketName): void {  $storage = new StorageClient();  $bucket = $storage->bucket($bucketName);  $bucket->update([  'lifecycle' => null  ]);  printf('Lifecycle management is disabled for bucket %s.' . PHP_EOL, $bucketName); }

Python

For more information, see the Cloud Storage Python API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample sets a lifecycle configuration on a bucket:

from google.cloud import storage def enable_bucket_lifecycle_management(bucket_name):  """Enable lifecycle management for a bucket""" # bucket_name = "my-bucket" storage_client = storage.Client() bucket = storage_client.get_bucket(bucket_name) rules = bucket.lifecycle_rules print(f"Lifecycle management rules for bucket {bucket_name} are {list(rules)}") bucket.add_lifecycle_delete_rule(age=2) bucket.patch() rules = bucket.lifecycle_rules print(f"Lifecycle management is enable for bucket {bucket_name} and the rules are {list(rules)}") return bucket

The following sample removes any existing lifecycle configuration from on a bucket:

from google.cloud import storage def disable_bucket_lifecycle_management(bucket_name):  """Disable lifecycle management for a bucket""" # bucket_name = "my-bucket" storage_client = storage.Client() bucket = storage_client.get_bucket(bucket_name) bucket.clear_lifecyle_rules() bucket.patch() rules = bucket.lifecycle_rules print(f"Lifecycle management is disable for bucket {bucket_name} and the rules are {list(rules)}") return bucket

Ruby

For more information, see the Cloud Storage Ruby API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

The following sample sets a lifecycle configuration on a bucket:

def enable_bucket_lifecycle_management bucket_name:  # Enable lifecycle management for a bucket  # The ID of your GCS bucket  # bucket_name = "your-unique-bucket-name"  require "google/cloud/storage"  storage = Google::Cloud::Storage.new  bucket = storage.bucket bucket_name  rules = bucket.lifecycle do |l|  l.add_delete_rule age: 2  end  puts "Lifecycle management is enabled for bucket #{bucket_name} and the rules are #{rules}" end

The following sample removes any existing lifecycle configuration from on a bucket:

def disable_bucket_lifecycle_management bucket_name:  # Disable lifecycle management for a bucket  # The ID of your GCS bucket  # bucket_name = "your-unique-bucket-name"  require "google/cloud/storage"  storage = Google::Cloud::Storage.new  bucket = storage.bucket bucket_name  bucket.lifecycle do |l|  l.clear  end  puts "Lifecycle management is disabled for bucket #{bucket_name}" end

Terraform

You can use a Terraform resource to set a lifecycle configuration for a bucket managed by Terraform. To set a lifecycle configuration on an existing bucket that isn't yet managed by Terraform, you must first import the existing bucket.

To find out whether a lifecycle condition is supported by Terraform, see the Terraform documentation for the condition block.

resource "random_id" "bucket_prefix" { byte_length = 8 } resource "google_storage_bucket" "auto_expire" { provider = google-beta name = "${random_id.bucket_prefix.hex}-example-bucket" location = "US" lifecycle_rule { condition { age = 3 } action { type = "Delete" } } }

REST APIs

JSON API

  1. Have gcloud CLI installed and initialized, which lets you generate an access token for the Authorization header.

  2. Create a JSON file with the lifecycle configuration rules you would like to apply. See configuration examples for sample JSON files.

  3. Use cURL to call the JSON API with a PATCH Bucket request:

    curl -X PATCH --data-binary @LIFECYCLE_CONFIG_FILE \ -H "Authorization: Bearer $(gcloud auth print-access-token)" \ -H "Content-Type: application/json" \ "https://storage.googleapis.com/storage/v1/b/BUCKET_NAME?fields=lifecycle"

    Where:

    • LIFECYCLE_CONFIG_FILE is the path for the JSON file that you created in Step 2.
    • BUCKET_NAME is the name of the relevant bucket. For example, my-bucket.

XML API

  1. Have gcloud CLI installed and initialized, which lets you generate an access token for the Authorization header.

  2. Create an XML file with the lifecycle configuration rules you would like to apply. See configuration examples for sample XML files.

  3. Use cURL to call the XML API with a PUT Bucket request and lifecycle query string parameter:

    curl -X PUT --data-binary @XML_FILE_NAME \ -H "Authorization: Bearer $(gcloud auth print-access-token)" \ "https://storage.googleapis.com/BUCKET_NAME?lifecycle"

    Where:

    • XML_FILE_NAME is the path for the XML file that you created in Step 2.
    • BUCKET_NAME is the name of the relevant bucket. For example, my-bucket.

Check the lifecycle configuration for a bucket

Console

  1. In the Google Cloud console, go to the Cloud Storage Buckets page.

    Go to Buckets

  2. In the bucket list, the lifecycle status of each bucket is found in the Lifecycle column.

    You can click this status to add, view, edit, and delete rules.

To learn how to get detailed error information about failed Cloud Storage operations in the Google Cloud console, see Troubleshooting.

Command line

Use the gcloud storage buckets describe command with the --format flag:

gcloud storage buckets describe gs://BUCKET_NAME --format="default(lifecycle_config)"

Where BUCKET_NAME is the name of the bucket whose lifecycle configuration you want to view. For example, my-bucket.

Client libraries

C++

For more information, see the Cloud Storage C++ API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries. 

namespace gcs = ::google::cloud::storage; using ::google::cloud::StatusOr; [](gcs::Client client, std::string const& bucket_name) {  StatusOr<gcs::BucketMetadata> updated_metadata =  client.GetBucketMetadata(bucket_name);  if (!updated_metadata) throw std::move(updated_metadata).status();  if (!updated_metadata->has_lifecycle() ||  updated_metadata->lifecycle().rule.empty()) {  std::cout << "Bucket lifecycle management is not enabled for bucket "  << updated_metadata->name() << ".\n";  return;  }  std::cout << "Bucket lifecycle management is enabled for bucket "  << updated_metadata->name() << ".\n";  std::cout << "The bucket lifecycle rules are";  for (auto const& kv : updated_metadata->lifecycle().rule) {  std::cout << "\n " << kv.condition() << ", " << kv.action();  }  std::cout << "\n"; }

C#

For more information, see the Cloud Storage C# API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

To view the bucket's lifecycle policies, follow the instructions for displaying a bucket's metadata and look for the lifecycle policy fields in the response. 
 using Google.Apis.Storage.v1.Data; using Google.Cloud.Storage.V1; using System; public class GetBucketMetadataSample {  public Bucket GetBucketMetadata(string bucketName = "your-unique-bucket-name")  {  var storage = StorageClient.Create();  var bucket = storage.GetBucket(bucketName, new GetBucketOptions { Projection = Projection.Full });  Console.WriteLine($"Bucket:\t{bucket.Name}");  Console.WriteLine($"Acl:\t{bucket.Acl}");  Console.WriteLine($"Billing:\t{bucket.Billing}");  Console.WriteLine($"Cors:\t{bucket.Cors}");  Console.WriteLine($"DefaultEventBasedHold:\t{bucket.DefaultEventBasedHold}");  Console.WriteLine($"DefaultObjectAcl:\t{bucket.DefaultObjectAcl}");  Console.WriteLine($"Encryption:\t{bucket.Encryption}");  if (bucket.Encryption != null)  {  Console.WriteLine($"KmsKeyName:\t{bucket.Encryption.DefaultKmsKeyName}");  }  Console.WriteLine($"Id:\t{bucket.Id}");  Console.WriteLine($"Kind:\t{bucket.Kind}");  Console.WriteLine($"Lifecycle:\t{bucket.Lifecycle}");  Console.WriteLine($"Location:\t{bucket.Location}");  Console.WriteLine($"LocationType:\t{bucket.LocationType}");  Console.WriteLine($"Logging:\t{bucket.Logging}");  Console.WriteLine($"Metageneration:\t{bucket.Metageneration}");  Console.WriteLine($"ObjectRetention:\t{bucket.ObjectRetention}");  Console.WriteLine($"Owner:\t{bucket.Owner}");  Console.WriteLine($"ProjectNumber:\t{bucket.ProjectNumber}");  Console.WriteLine($"RetentionPolicy:\t{bucket.RetentionPolicy}");  Console.WriteLine($"SelfLink:\t{bucket.SelfLink}");  Console.WriteLine($"StorageClass:\t{bucket.StorageClass}");  Console.WriteLine($"TimeCreated:\t{bucket.TimeCreated}");  Console.WriteLine($"Updated:\t{bucket.Updated}");  Console.WriteLine($"Versioning:\t{bucket.Versioning}");  Console.WriteLine($"Website:\t{bucket.Website}");  Console.WriteLine($"TurboReplication:\t{bucket.Rpo}");  if (bucket.Labels != null)  {  Console.WriteLine("Labels:");  foreach (var label in bucket.Labels)  {  Console.WriteLine($"{label.Key}:\t{label.Value}");  }  }  return bucket;  } }

Go

For more information, see the Cloud Storage Go API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

To view the bucket's lifecycle policies, follow the instructions for displaying a bucket's metadata and look for the lifecycle policy fields in the response. 
import ( "context" "fmt" "io" "time" "cloud.google.com/go/storage" ) // getBucketMetadata gets the bucket metadata. func getBucketMetadata(w io.Writer, bucketName string) (*storage.BucketAttrs, error) { // bucketName := "bucket-name" ctx := context.Background() client, err := storage.NewClient(ctx) if err != nil { return nil, fmt.Errorf("storage.NewClient: %w", err) } defer client.Close() ctx, cancel := context.WithTimeout(ctx, time.Second*10) defer cancel() attrs, err := client.Bucket(bucketName).Attrs(ctx) if err != nil { return nil, fmt.Errorf("Bucket(%q).Attrs: %w", bucketName, err) } fmt.Fprintf(w, "BucketName: %v\n", attrs.Name) fmt.Fprintf(w, "Location: %v\n", attrs.Location) fmt.Fprintf(w, "LocationType: %v\n", attrs.LocationType) fmt.Fprintf(w, "StorageClass: %v\n", attrs.StorageClass) fmt.Fprintf(w, "Turbo replication (RPO): %v\n", attrs.RPO) fmt.Fprintf(w, "TimeCreated: %v\n", attrs.Created) fmt.Fprintf(w, "Metageneration: %v\n", attrs.MetaGeneration) fmt.Fprintf(w, "PredefinedACL: %v\n", attrs.PredefinedACL) if attrs.Encryption != nil { fmt.Fprintf(w, "DefaultKmsKeyName: %v\n", attrs.Encryption.DefaultKMSKeyName) } if attrs.Website != nil { fmt.Fprintf(w, "IndexPage: %v\n", attrs.Website.MainPageSuffix) fmt.Fprintf(w, "NotFoundPage: %v\n", attrs.Website.NotFoundPage) } fmt.Fprintf(w, "DefaultEventBasedHold: %v\n", attrs.DefaultEventBasedHold) if attrs.RetentionPolicy != nil { fmt.Fprintf(w, "RetentionEffectiveTime: %v\n", attrs.RetentionPolicy.EffectiveTime) fmt.Fprintf(w, "RetentionPeriod: %v\n", attrs.RetentionPolicy.RetentionPeriod) fmt.Fprintf(w, "RetentionPolicyIsLocked: %v\n", attrs.RetentionPolicy.IsLocked) } fmt.Fprintf(w, "ObjectRetentionMode: %v\n", attrs.ObjectRetentionMode) fmt.Fprintf(w, "RequesterPays: %v\n", attrs.RequesterPays) fmt.Fprintf(w, "VersioningEnabled: %v\n", attrs.VersioningEnabled) if attrs.Logging != nil { fmt.Fprintf(w, "LogBucket: %v\n", attrs.Logging.LogBucket) fmt.Fprintf(w, "LogObjectPrefix: %v\n", attrs.Logging.LogObjectPrefix) } if attrs.CORS != nil { fmt.Fprintln(w, "CORS:") for _, v := range attrs.CORS { fmt.Fprintf(w, "\tMaxAge: %v\n", v.MaxAge) fmt.Fprintf(w, "\tMethods: %v\n", v.Methods) fmt.Fprintf(w, "\tOrigins: %v\n", v.Origins) fmt.Fprintf(w, "\tResponseHeaders: %v\n", v.ResponseHeaders) } } if attrs.Labels != nil { fmt.Fprintf(w, "\n\n\nLabels:") for key, value := range attrs.Labels { fmt.Fprintf(w, "\t%v = %v\n", key, value) } } return attrs, nil }

Java

For more information, see the Cloud Storage Java API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

To view the bucket's lifecycle policies, follow the instructions for displaying a bucket's metadata and look for the lifecycle policy fields in the response. 
 import com.google.cloud.storage.Bucket; import com.google.cloud.storage.BucketInfo; import com.google.cloud.storage.Storage; import com.google.cloud.storage.StorageOptions; import java.util.Map; public class GetBucketMetadata {  public static void getBucketMetadata(String projectId, String bucketName) {  // The ID of your GCP project  // String projectId = "your-project-id";  // The ID of your GCS bucket  // String bucketName = "your-unique-bucket-name";  Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();  // Select all fields. Fields can be selected individually e.g. Storage.BucketField.NAME  Bucket bucket =  storage.get(bucketName, Storage.BucketGetOption.fields(Storage.BucketField.values()));  // Print bucket metadata  System.out.println("BucketName: " + bucket.getName());  System.out.println("DefaultEventBasedHold: " + bucket.getDefaultEventBasedHold());  System.out.println("DefaultKmsKeyName: " + bucket.getDefaultKmsKeyName());  System.out.println("Id: " + bucket.getGeneratedId());  System.out.println("IndexPage: " + bucket.getIndexPage());  System.out.println("Location: " + bucket.getLocation());  System.out.println("LocationType: " + bucket.getLocationType());  System.out.println("Metageneration: " + bucket.getMetageneration());  System.out.println("NotFoundPage: " + bucket.getNotFoundPage());  System.out.println("RetentionEffectiveTime: " + bucket.getRetentionEffectiveTime());  System.out.println("RetentionPeriod: " + bucket.getRetentionPeriod());  System.out.println("RetentionPolicyIsLocked: " + bucket.retentionPolicyIsLocked());  System.out.println("RequesterPays: " + bucket.requesterPays());  System.out.println("SelfLink: " + bucket.getSelfLink());  System.out.println("StorageClass: " + bucket.getStorageClass().name());  System.out.println("TimeCreated: " + bucket.getCreateTime());  System.out.println("VersioningEnabled: " + bucket.versioningEnabled());  System.out.println("ObjectRetention: " + bucket.getObjectRetention());  if (bucket.getLabels() != null) {  System.out.println("\n\n\nLabels:");  for (Map.Entry<String, String> label : bucket.getLabels().entrySet()) {  System.out.println(label.getKey() + "=" + label.getValue());  }  }  if (bucket.getLifecycleRules() != null) {  System.out.println("\n\n\nLifecycle Rules:");  for (BucketInfo.LifecycleRule rule : bucket.getLifecycleRules()) {  System.out.println(rule);  }  }  } }

Node.js

For more information, see the Cloud Storage Node.js API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

To view the bucket's lifecycle policies, follow the instructions for displaying a bucket's metadata and look for the lifecycle policy fields in the response. 
// Imports the Google Cloud client library const {Storage} = require('@google-cloud/storage'); // Creates a client const storage = new Storage(); async function getBucketMetadata() {  /**  * TODO(developer): Uncomment the following lines before running the sample.  */  // The ID of your GCS bucket  // const bucketName = 'your-unique-bucket-name';  // Get Bucket Metadata  const [metadata] = await storage.bucket(bucketName).getMetadata();  console.log(JSON.stringify(metadata, null, 2)); }

PHP

For more information, see the Cloud Storage PHP API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

To view the bucket's lifecycle policies, follow the instructions for displaying a bucket's metadata and look for the lifecycle policy fields in the response. 
use Google\Cloud\Storage\StorageClient; /**  * Get bucket metadata.  *  * @param string $bucketName The name of your Cloud Storage bucket.  * (e.g. 'my-bucket')  */ function get_bucket_metadata(string $bucketName): void {  $storage = new StorageClient();  $bucket = $storage->bucket($bucketName);  $info = $bucket->info();  printf('Bucket Metadata: %s' . PHP_EOL, print_r($info, true)); }

Python

For more information, see the Cloud Storage Python API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

To view the bucket's lifecycle policies, follow the instructions for displaying a bucket's metadata and look for the lifecycle policy fields in the response. 
 from google.cloud import storage def bucket_metadata(bucket_name):  """Prints out a bucket's metadata.""" # bucket_name = 'your-bucket-name' storage_client = storage.Client() bucket = storage_client.get_bucket(bucket_name) print(f"ID: {bucket.id}") print(f"Name: {bucket.name}") print(f"Storage Class: {bucket.storage_class}") print(f"Location: {bucket.location}") print(f"Location Type: {bucket.location_type}") print(f"Cors: {bucket.cors}") print(f"Default Event Based Hold: {bucket.default_event_based_hold}") print(f"Default KMS Key Name: {bucket.default_kms_key_name}") print(f"Metageneration: {bucket.metageneration}") print( f"Public Access Prevention: {bucket.iam_configuration.public_access_prevention}" ) print(f"Retention Effective Time: {bucket.retention_policy_effective_time}") print(f"Retention Period: {bucket.retention_period}") print(f"Retention Policy Locked: {bucket.retention_policy_locked}") print(f"Object Retention Mode: {bucket.object_retention_mode}") print(f"Requester Pays: {bucket.requester_pays}") print(f"Self Link: {bucket.self_link}") print(f"Time Created: {bucket.time_created}") print(f"Versioning Enabled: {bucket.versioning_enabled}") print(f"Labels: {bucket.labels}")

Ruby

For more information, see the Cloud Storage Ruby API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

To view the bucket's lifecycle policies, follow the instructions for displaying a bucket's metadata and look for the lifecycle policy fields in the response. 
def get_bucket_metadata bucket_name:  # The ID of your GCS bucket  # bucket_name = "your-unique-bucket-name"  require "google/cloud/storage"  storage = Google::Cloud::Storage.new  bucket = storage.bucket bucket_name  puts "ID: #{bucket.id}"  puts "Name: #{bucket.name}"  puts "Storage Class: #{bucket.storage_class}"  puts "Location: #{bucket.location}"  puts "Location Type: #{bucket.location_type}"  puts "Cors: #{bucket.cors}"  puts "Default Event Based Hold: #{bucket.default_event_based_hold?}"  puts "Default KMS Key Name: #{bucket.default_kms_key}"  puts "Logging Bucket: #{bucket.logging_bucket}"  puts "Logging Prefix: #{bucket.logging_prefix}"  puts "Metageneration: #{bucket.metageneration}"  puts "Retention Effective Time: #{bucket.retention_effective_at}"  puts "Retention Period: #{bucket.retention_period}"  puts "Retention Policy Locked: #{bucket.retention_policy_locked?}"  puts "Requester Pays: #{bucket.requester_pays}"  puts "Self Link: #{bucket.api_url}"  puts "Time Created: #{bucket.created_at}"  puts "Versioning Enabled: #{bucket.versioning?}"  puts "Index Page: #{bucket.website_main}"  puts "Not Found Page: #{bucket.website_404}"  puts "Labels:"  bucket.labels.each do |key, value|  puts " - #{key} = #{value}"  end  puts "Lifecycle Rules:"  bucket.lifecycle.each do |rule|  puts "#{rule.action} - #{rule.storage_class} - #{rule.age} - #{rule.matches_storage_class}"  end end

REST APIs

JSON API

  1. Have gcloud CLI installed and initialized, which lets you generate an access token for the Authorization header.

  2. Use cURL to call the JSON API with a GET Bucket request:

    curl -X GET \ -H "Authorization: Bearer $(gcloud auth print-access-token)" \ "https://storage.googleapis.com/storage/v1/b/BUCKET_NAME?fields=lifecycle"

    Where BUCKET_NAME is the name of the relevant bucket. For example, my-bucket.

XML API

  1. Have gcloud CLI installed and initialized, which lets you generate an access token for the Authorization header.

  2. Use cURL to call the XML API with a GET Bucket request and a lifecycle query string parameter:

    curl -X GET \ -H "Authorization: Bearer $(gcloud auth print-access-token)" \ "https://storage.googleapis.com/BUCKET_NAME?lifecycle"

    Where BUCKET_NAME is the name of the relevant bucket. For example, my-bucket.

What's next