Generic ARK for AWS Transit Gateway Operations Overview

Bringing a Resource In Service (restore)

• Retrieves information for all route tables in the VPC where the local node resides (local VPC). If there is a route table entry with a virtual IP address set as the destination, and the target differs from the local node’s ENI, it changes the target to the local node’s ENI.
• Retrieves the route table information for the Transit Gateway attached to the local VPC (local Transit Gateway). If there is a route table entry with a virtual IP address set as the destination, and the target is different from the local VPC, it changes it to the local VPC.
• If there is another Transit Gateway (remote Transit Gateway) that is peered with the local Transit Gateway, it retrieves the route table information for the remote Transit Gateway. If there is a route table entry with a virtual IP address set as the destination, and the target differs from the local Transit Gateway, change it to the local Transit Gateway.
• If a VPC other than the local VPC (remote VPC) is attached to the local Transit Gateway, it retrieves all route table information for the remote VPC. If there is a route table entry with a virtual IP address set as the destination, and the target differs from the local Transit Gateway, it changes it to the local Transit Gateway.
• Retrieves all route table information for VPCs attached to the remote Transit Gateway (remote VPCs). If there is a route table entry with a virtual set as the destination, and the target is different from the local Transit Gateway, change it to the remote Transit Gateway.

Taking a Resource Out of Service (remove)

No actions are necessary to remove.

Monitoring (quickCheck)

• Retrieves information for all route tables in the VPC where the local node resides (local VPC). If there is a route table entry with a virtual IP address set as the destination, it checks whether the target is identical to the local node’s ENI. If they differ, it determines that the quickCheck has failed, and Monitoring will terminate.
• Retrieves the route table information for the Transit Gateway attached to the local VPC (local Transit Gateway). If there is a route table entry with a virtual set as the destination, it checks whether the target is the same as the local VPC. If they differ, it determines that the quickCheck has failed, and Monitoring will terminate.
• If another Transit Gateway (remote Transit Gateway) peered with the local Transit Gateway exists, it retrieves the route table information from the remote Transit Gateway. If there is a route table entry with a virtual IP address set as the destination, it checks whether the target is the same as the local Transit Gateway. If different, it determines that the quickCheck failed, and Monitoring will terminate.
• When a VPC other than the local VPC (remote VPC) is attached to the local Transit Gateway, it retrieves information for all route tables in the remote VPC. If there is a route table entry with a virtual IP address set as the destination, it verifies whether the target is the same as the local Transit Gateway. If they differ, it determines that the quickCheck has failed, and Monitoring will terminate.
• Retrieves information for all route tables in the VPC attached to the remote Transit Gateway (remote VPC). If there is a route table entry with a virtual IP address set as the destination, it verifies whether the target is the same as the remote Transit Gateway. If they differ, it determines that the quickCheck has failed, and Monitoring will terminate.

Recovery (recover)

Perform the same steps as the restore process.