Export Postgres csvlog destination logs to Cloudwatch

I understand you're looking for options beyond the log_fdw extension, and I'm pleased to confirm that there are indeed several effective alternatives available to you.

Alternative Methods to Access CSV Log Files:

1. Download via AWS Management Console:

You can easily download log files directly through the console by following these steps:

a. Open the Amazon RDS console

b. Navigate to Databases and select your DB instance

c. Go to the Logs & events tab

d. Locate the csvlog files (they'll follow your log_filename pattern)

e. Click the Download button next to the log file

f. Save the file locally for analysis

2. Download via AWS CLI:

For automated or scripted access, you can use the download-db-log-file-portion command:

To download the entire log file: CLI

aws rds download-db-log-file-portion \
    --db-instance-identifier your-instance-name \
    --log-file-name error/postgresql.log.2026-01-27-10 \
    --starting-token 0 \
    --output text > local-logfile.csv

To download the latest portion only: CLI

aws rds download-db-log-file-portion \
    --db-instance-identifier your-instance-name \
    --log-file-name error/postgresql.log.2026-01-27-10 \
    --output text

3. CloudWatch Logs:

Since you've already enabled CloudWatch Logs export, you have convenient access to csvlog data through the CloudWatch Console:

a. Navigate to CloudWatch → Log groups

b. Access /aws/rds/instance/your-instance-name/postgresql

c. View, search, and filter log streams

d. Export log data to S3 for long-term storage

Test Results and Important Configuration Note

I've conducted testing to verify the configuration, and I'd like to share an important finding:

To successfully generate csvlog files, the log_destination parameter must include both stderr,csvlog as shown below:

sql

postgres=> show log_destination;
 log_destination
-----------------
 stderr,csvlog
(1 row)

Sample Log Output from Testing:

Here are examples of the log entries generated during my testing:

2026-01-27T10:22:14.000Z
2026-01-27 10:22:14 UTC:[IP_ADDRESS].xx.xx(37678):user@postgres:[1583]:ERROR:  relation "some_table" does not exist at character 13

2026-01-27 10:22:14 UTC:[IP_ADDRESS].xx.xx(37678):user@postgres:[1583]:STATEMENT:  INSERT INTO some_table VALUES ('invalid_data_type');

2026-01-27T10:22:37.000Z
2026-01-27 10:22:37 UTC::@:[1341]:LOG:  checkpoint starting: time

These results confirm that the configuration is working as expected and both stderr and csvlog formats are being generated successfully.

Summary:

I hope this information helps clarify the available options for accessing your PostgreSQL log files. Each method has its own advantages depending on your specific use case whether you need manual inspection, automated processing, or real-time monitoring.

Yes, you can export PostgreSQL logs, including those in csvlog format, to Amazon CloudWatch Logs from both Aurora PostgreSQL DB clusters and RDS for PostgreSQL instances.

For Aurora PostgreSQL, you can configure your DB cluster to export log data to CloudWatch Logs on a regular basis. This allows your PostgreSQL log events to be automatically published to CloudWatch, where they're stored in a Log group for your cluster with one or more log streams containing events from each instance.

For RDS for PostgreSQL, you can publish several types of logs to CloudWatch Logs, including the PostgreSQL log, upgrade log, and IAM database authentication error log.

To enable log exports to CloudWatch Logs, you have several options:

1. Using the AWS Management Console: When creating or modifying your PostgreSQL DB instance or Aurora cluster, select the appropriate log types under the "Log exports" option.

2. Using the AWS CLI:

• For Aurora PostgreSQL, use the modify-db-cluster command with the --cloudwatch-logs-export-configuration parameter specifying "postgresql" as the log type.
• For RDS PostgreSQL, use the modify-db-instance command with the --cloudwatch-logs-export-configuration parameter.

3. Using the RDS API: You can use the appropriate API operations to enable log exports.

Once configured, your PostgreSQL logs will be published to CloudWatch Logs, where you can evaluate them, create alarms, view metrics, and perform real-time analysis using CloudWatch Logs Insights.

This approach provides a way to store your PostgreSQL logs in durable storage and analyze them without needing to use the log_fdw extension.
Sources
Publishing Aurora PostgreSQL logs to Amazon CloudWatch Logs - Amazon Aurora
RDS for PostgreSQL database log files - Amazon Relational Database Service
Turning on the option to publish logs to Amazon CloudWatch - Amazon Aurora
Analyze CloudWatch log data for RDS for PostgreSQL database | AWS re:Post