AWS CLI Automation for Disaster Recovery and Database Failover

Automating the process of creating daily snapshots of your Amazon EC2 instances, copying those snapshots to a backup region, and setting up restoration procedures in case of a disaster in the primary region can be achieved using the AWS Command Line Interface (AWS CLI). Below are the general steps to perform this task. Note that this is a complex task, and you should customize it to your specific setup and needs.

1. Schedule Daily Snapshot Creation:

First, you need to schedule the creation of daily snapshots for your EC2 instances in the primary region. You can use AWS Lambda and CloudWatch Events to trigger this process.

  1. Copy Snapshots to Backup Region:

You can use the aws ec2 copy-snapshot command to copy the snapshots created in the primary region to the backup region. Here’s an example:

  1. Restore Backups in Case of Disaster:

To restore backups in case of a disaster in the primary region, you should set up a disaster recovery plan. You would need to script the process of launching EC2 instances, attaching EBS volumes, and other necessary configuration in the backup region.

You can use AWS CloudFormation, AWS Elastic Beanstalk, or other orchestration tools to automate this process. The specific steps and scripts for restoring backups will depend on your application and infrastructure setup.

Setting up a cross-region read replica of an Amazon Aurora database using the AWS CLI and promoting it as the master database in case of a disaster in the primary region involves several steps. Below, I’ll provide you with a general outline of the process. Please adapt it to your specific needs and configurations.

Step 1: Create a Cross-Region Read Replica

To create a cross-region read replica of an Amazon Aurora database in the backup region, you can use the create-db-instance command with the --db-instance-identifier and --source-db-instance-identifier parameters:

Step 2: Monitor the Replication Status

You can use the AWS CLI or the RDS Console to monitor the replication status of the read replica. Wait until the replica is fully synchronized with the primary database.

Step 3: Promote the Read Replica

In case of a disaster in the primary region, you can promote the read replica to be the master database in the backup region using the promote-read-replica command:

This command promotes the specified read replica to become the new primary database. You should also update your application’s configuration to point to the newly promoted database endpoint.

Step 4: Modify Security Groups and Network Configuration

Ensure that the security groups and network configuration in the backup region allow incoming traffic to the promoted database. This might involve updating the security group rules, adjusting the VPC peering, or VPN/Direct Connect configurations as needed.

Please note that this process is a simplified overview, and the actual implementation may vary depending on your specific Aurora setup, replication configuration, and network topology. You should thoroughly test and document this failover process to ensure that it works as expected in a disaster recovery scenario. Additionally, you might want to consider other aspects of disaster recovery, such as automated DNS failover or application-level failover mechanisms.

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