Amazon S3 Logs

Amazon S3 server access logging provides detailed records for the requests made to the bucket. S3 access logs can be enabled and saved in another S3 bucket.

Create log ingestion

You can create a log ingestion into Amazon OpenSearch Service either by using the Centralized Logging with OpenSearch console or by deploying a standalone CloudFormation stack.

Important

The S3 Bucket region must be the same as the Centralized Logging with OpenSearch solution region.
The Amazon OpenSearch Service index is rotated on a daily basis by default, and you can adjust the index in the Additional Settings.

Using the Centralized Logging with OpenSearch Console

Sign in to the Centralized Logging with OpenSearch Console.
In the navigation pane, under Log Analytics Pipelines, choose Service Log.
Choose the Create a log ingestion button.
In the AWS Services section, choose Amazon S3.
Choose Next.
Under Specify settings, choose Automatic or Manual for S3 Access Log enabling. The automatic mode will enable the S3 Access Log and save the logs to a centralized S3 bucket if logging is not enabled yet.
- For Automatic mode, choose the S3 bucket from the dropdown list.
- For Manual mode, enter the Bucket Name and S3 Access Log location.
- (Optional) If you are ingesting Amazon S3 logs from another account, select a linked account from the Account dropdown list first.
Choose Next.
In the Specify OpenSearch domain section, select an imported domain for Amazon OpenSearch domain.
Choose Yes for Sample dashboard if you want to ingest an associated built-in Amazon OpenSearch Service dashboard.
You can change the Index Prefix of the target Amazon OpenSearch Service index if needed. The default prefix is your bucket name.
In the Log Lifecycle section, enter the number of days to manage the Amazon OpenSearch Service index lifecycle. The Centralized Logging with OpenSearch will create the associated Index State Management (ISM) policy automatically for this pipeline.
Choose Next.
Add tags if needed.
Choose Create.

Using the CloudFormation Stack

This automated AWS CloudFormation template deploys the Centralized Logging with OpenSearch - S3 Access Log Ingestion solution in the AWS Cloud.

	Launch in AWS Console	Download Template
AWS Regions		Template
AWS China Regions		Template

Log in to the AWS Management Console and select above button to launch the AWS CloudFormation template. You can also download the template as a starting point for your own implementation.
To launch the stack in a different AWS Region, use the Region selector in the console navigation bar.
On the Create stack page, verify that the correct template URL shows in the Amazon S3 URL text box and choose Next.
On the Specify stack details page, assign a name to your solution stack.
Under Parameters, review the parameters for the template and modify them as necessary. This solution uses the following parameters.

Parameter	Default	Description
Log Bucket Name	`<Requires input>`	The S3 bucket name which stores the logs.
Log Bucket Prefix	`<Requires input>`	The S3 bucket path prefix which stores the logs.
Log Source Account ID	`<Optional>`	The AWS Account ID of the S3 bucket. Required for cross-account log ingestion (Please add a member account first). By default, the Account ID you logged in at Step 1 will be used.
Log Source Region	`<Optional>`	The AWS Region of the S3 bucket. By default, the Region you selected at Step 2 will be used.
Log Source Account Assume Role	`<Optional>`	The IAM Role ARN used for cross-account log ingestion. Required for cross-account log ingestion (Please add a member account first).
KMS-CMK ARN	`<Optional>`	The KMS-CMK ARN for encryption. Leave it blank to create a new KMS CMK.
Enable OpenSearch Ingestion as processor	`<Optional>`	Ingestion table Arn. Leave empty if you do not use OSI as Processor.
S3 Backup Bucket	`<Requires input>`	The S3 backup bucket name to store the failed ingestion logs.
Engine Type	OpenSearch	The engine type of the OpenSearch. Select OpenSearch or Elasticsearch.
OpenSearch Domain Name	`<Requires input>`	The domain name of the Amazon OpenSearch cluster.
OpenSearch Endpoint	`<Requires input>`	The OpenSearch endpoint URL. For example, `vpc-your_opensearch_domain_name-xcvgw6uu2o6zafsiefxubwuohe.us-east-1.es.amazonaws.com`
Index Prefix	`<Requires input>`	The common prefix of OpenSearch index for the log. The index name will be `<Index Prefix>-<Log Type>-<Other Suffix>`.
Create Sample Dashboard	Yes	Whether to create a sample OpenSearch dashboard.
VPC ID	`<Requires input>`	Select a VPC which has access to the OpenSearch domain. The log processing Lambda will reside in the selected VPC.
Subnet IDs	`<Requires input>`	Select at least two subnets which have access to the OpenSearch domain. The log processing Lambda will reside in the subnets. Make sure the subnets have access to the Amazon S3 service.
Security Group ID	`<Requires input>`	Select a Security Group which will be associated with the log processing Lambda. Make sure the Security Group has access to the OpenSearch domain.
Number Of Shards	5	Number of shards to distribute the index evenly across all data nodes. Keep the size of each shard between 10-50 GB.
Number of Replicas	1	Number of replicas for OpenSearch Index. Each replica is a full copy of an index. If the OpenSearch option is set to Domain with standby, you need to configure it to 2.
Age to Warm Storage	`<Optional>`	The age required to move the index into warm storage (e.g. 7d). Index age is the time between its creation and the present. Supported units are d (days) and h (hours). This is only effective when warm storage is enabled in OpenSearch.
Age to Cold Storage	`<Optional>`	The age required to move the index into cold storage (e.g. 30d). Index age is the time between its creation and the present. Supported units are d (days) and h (hours). This is only effective when cold storage is enabled in OpenSearch.
Age to Retain	`<Optional>`	The age to retain the index (e.g. 180d). Index age is the time between its creation and the present. Supported units are d (days) and h (hours). If value is "", the index will not be deleted.
Rollover Index Size	`<Optional>`	The minimum size of the shard storage required to roll over the index (e.g. 30GB).
Index Suffix	yyyy-MM-dd	The common suffix format of OpenSearch index for the log(Example: yyyy-MM-dd, yyyy-MM-dd-HH). The index name will be `<Index Prefix>-<Log Type>-<Index Suffix>-000001`.
Compression type	best_compression	The compression type to use to compress stored data. Available values are best_compression and default.
Refresh Interval	1s	How often the index should refresh, which publishes its most recent changes and makes them available for searching. Can be set to -1 to disable refreshing. Default is 1s.
EnableS3Notification	True	An option to enable or disable notifications for Amazon S3 buckets. The default option is recommended for most cases.
LogProcessorRoleName	`<Optional>`	Specify a role name for the log processor. The name should NOT duplicate an existing role name. If no name is specified, a random name is generated.
QueueName	`<Optional>`	Specify a queue name for an SQS. The name should NOT duplicate an existing queue name. If no name is given, a random name will be generated.

Choose Next.
On the Configure stack options page, choose Next.
On the Review page, review and confirm the settings. Check the box acknowledging that the template creates AWS Identity and Access Management (IAM) resources.
Choose Create stack to deploy the stack.

You can view the status of the stack in the AWS CloudFormation console in the Status column. You should receive a CREATE_COMPLETE status in approximately 10 minutes.

View dashboard

The dashboard includes the following visualizations.

Visualization Name	Source Field	Description
Total Requests	log event	A visualization showing the total number of requests made to the AWS S3 bucket, including all types of operations (e.g., GET, PUT, DELETE).
Unique Visitors	log event	This visualization displays the count of unique visitors accessing the AWS S3 bucket, identified by their IP addresses.
Access History	log event	Provides a chronological log of all access events made to the AWS S3 bucket, including details about the operations and their outcomes.
Request By Operation	operation	This visualization categorizes and shows the distribution of requests based on different operations, such as GET, PUT, DELETE, etc.
Status Code	http_status	Displays the count of requests made to the AWS S3 bucket, grouped by HTTP status codes returned by the server (e.g., 200, 404, 403, etc.).
Status Code History	http_status	Shows the historical trend of HTTP status codes returned by the AWS S3 server over a specific period of time.
Status Code Pie	http_status	Represents the distribution of requests based on different HTTP status codes using a pie chart.
Average Time	total_time	This visualization calculates and presents the average time taken for various operations in the AWS S3 bucket (e.g., average time for GET, PUT requests, etc.).
Average Turn Around Time	turn_around_time	Shows the average turnaround time for different operations, which is the time between receiving a request and sending the response back to the client.
Data Transfer	bytes_sent object_size operation	Provides insights into data transfer activities, including the total bytes transferred, object sizes, and different operations involved.
Top Client IPs	remote_ip	Displays the top client IP addresses with the highest number of requests made to the AWS S3 bucket.
Top Request Keys	key object_size	Shows the top requested keys in the AWS S3 bucket along with the corresponding object sizes.
Delete Events	operation key version_id object_size remote_ip http_status error_code	Focuses on delete events, including the operation, key, version ID, object size, client IP, HTTP status, and error code associated with the delete requests.
Access Failures	operation key version_id object_size remote_ip http_status error_code	Highlights access failures, showing the details of the failed requests, including operation, key, version ID, object size, client IP, HTTP status, and error code.

Sample Dashboard

You can access the built-in dashboard in Amazon OpenSearch to view log data. For more information, see Access Dashboard.

You can click the below image to view the high-resolution sample dashboard.