Securely Connect Google Cloud Applications to On-Premises Database Server
Question
Your company has embraced a hybrid cloud strategy where some of the applications are deployed on Google Cloud.
A Virtual Private Network (VPN) tunnel connects your Virtual Private Cloud (VPC) in Google Cloud with your company's on-premises network.
Multiple applications in Google Cloud need to connect to an on-premises database server, and you want to avoid having to change the IP configuration in all of your applications when the IP of the database changes.
What should you do?
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D.A.
In a hybrid cloud strategy where some applications are deployed on Google Cloud and others are hosted on-premises, it is common to have a Virtual Private Network ( VPN) tunnel connecting the VPC in Google Cloud with the on-premises network. This allows for secure communication between the cloud and on-premises resources.
In this scenario, multiple applications in Google Cloud need to connect to an on-premises database server. However, the IP address of the database server can change frequently, which can be problematic if the applications are hard-coded with the IP address.
To avoid having to change the IP configuration in all of the applications each time the database IP changes, the best approach is to use DNS to provide a hostname that resolves to the current IP address of the database server. This allows the applications to connect to the database server using the hostname instead of the IP address.
Option B is the correct answer: Create a private zone on Cloud DNS, and configure the applications with the DNS name.
To implement this approach, you would need to perform the following steps:
- Create a private DNS zone on Cloud DNS. This zone is only visible to resources within the VPC network.
- Configure the DNS zone with a record that maps a hostname to the current IP address of the database server. This can be done manually or automatically using a script or tool that updates the DNS record when the IP address changes.
- Configure the applications in Google Cloud to connect to the database server using the hostname instead of the IP address. This can be done by updating the application configuration to reference the hostname provided by the DNS zone.
By using DNS to provide a hostname that resolves to the current IP address of the database server, you can ensure that the applications in Google Cloud can connect to the database server even if the IP address changes. This avoids the need to update the IP configuration in all of the applications, which can be time-consuming and error-prone.
Option A is not the correct answer because Cloud NAT is used to provide internet connectivity for resources in private subnets of a VPC. It does not provide a solution for resolving the IP address of a database server.
Option C is not the correct answer because configuring the IP of the database as custom metadata for each instance is not scalable and will require manual intervention each time the IP address changes.
Option D is not the correct answer because Compute Engine internal DNS is used to resolve the internal IP addresses of Compute Engine instances within the same VPC network. It does not provide a solution for resolving the IP address of an on-premises database server.
