database server offline

The error message you're seeing indicates that your website is unable to establish a connection with its database. This is not likely an issue with Amazon's servers in general, but rather a problem specific to your setup. Here are some steps you can take to troubleshoot and potentially resolve the issue:

1. Check the database service: The database service (likely MySQL or MariaDB) may have stopped running. Try restarting it by connecting to your instance via SSH and running the command:

   sudo /opt/bitnami/ctlscript.sh restart mysql

   You can also check the status of the service with:

   sudo /opt/bitnami/ctlscript.sh status

2. Verify database credentials: Ensure that the database connection details in your configuration files are correct. Sometimes, these can become corrupted or changed unexpectedly.

3. Check resource usage: Your instance may be running low on resources, particularly memory, which can cause database connection issues. Monitor your instance's resource usage and consider upgrading if you're consistently running low.

4. Review error logs: Check your application and database error logs for any specific error messages that might provide more insight into the issue.

5. Ensure database accessibility: If your database is on a separate instance, check the security group settings to make sure the proper ports are open between your web server and database server.

6. Recent changes: If you've recently updated any part of your application or made configuration changes, these might be causing conflicts. Consider rolling back to a previous known-good state if possible.

If these steps don't resolve the issue, you may need to investigate further by examining log files or considering a restoration from a recent backup if available. If you're not comfortable with these technical steps, it may be best to consult with your IT support team or hosting provider for more detailed assistance.
Sources
Error establishing a database connection | AWS re:Post
Error establishing a database connection - Lightsail and Wordpress | AWS re:Post
Lightsail/Wordpress site mysteriously down and inaccessible | AWS re:Post