Multi-cloud computing, wherein data and applications are distributed across multiple cloud services, is becoming an increasingly popular strategy in the world of software development. While this strategy provides a plethora of undeniable benefits for an organization, it requires an awareness and understanding of several unique security challenges.
Below, I will discuss the advantages of using a multi-cloud strategy as well as the security challenges associated with it. In addition to identifying the areas of concern, I will offer some tips and best practices for keeping your multi-cloud environments manageable and secure.
There are several advantages to moving to a multi-cloud strategy, from bolstering system resilience to increasing organizational flexibility. Let’s take a more in-depth look at a few of these benefits.
One of the most important aspects of building an application is ensuring that it is reliable and available. Multi-cloud architectures help organizations avoid downtime by providing teams with the resources they need to keep their services running when one cloud provider experiences an outage or other major disruption.
As they compete with one another for business, cloud providers regularly innovate and refine their offerings to better meet the needs of development organizations. An organization that leverages the services of multiple cloud providers is in a better position to take advantage of these advancements. This will help move the business forward by enabling developers to continually innovate without worrying about the limitations of any one individual cloud provider.
Locking yourself into a particular cloud vendor can be problematic for several reasons. As mentioned above, the provider may not be capable of effectively running a newly-minted application. In addition, the quality of the service that the cloud vendor provides may decline over time. If such a situation occurs (and an organization is unprepared to leverage another cloud service), the damage to the business can be severe. A multi-cloud strategy inherently reduces your organization’s dependence on any one particular vendor.
With all of these benefits, what could go wrong? When it comes to application, data, and infrastructure security, a lot could go wrong if teams are not prepared to address the challenges associated with the move to multi-cloud.
When organizations make the move to a multi-cloud architecture, they significantly expand their attack surface. This makes appropriate monitoring all the more important – but monitoring in the world of multi-cloud can be a rather complex undertaking. For instance, it’s tempting (and sounds simple enough) to leverage the cloud service provider’s built-in monitoring tools to track actions within their services. However, this approach results in siloed visibility and fails to provide a unified view of what is occurring across the entire multi-cloud infrastructure.
Instead, DevOps teams should utilize modern cloud monitoring tools that provide a holistic and unified view of their cloud deployments across all platforms. That way, issues (security-related or otherwise) can be identified and rectified as soon as possible.
When working with a public cloud service provider, organizations must be aware of something called “shared responsibility.” This means that the cloud service provider is responsible for certain aspects of security while others are left up to the DevOps teams leveraging the service. When taking a multi-cloud approach, the trick is to maintain a keen awareness of where the cloud provider’s responsibility ends and yours begins.
In many instances, the provider will be responsible for securing the infrastructure that powers their cloud services, leaving the organization responsible for securing everything that they store and run in the cloud (including guest operating systems, applications/services, and data). The exact scenario may vary somewhat depending upon the provider and the service. When uncertain, it is a best practice for the organization to assume responsibility and take the necessary steps to ensure that their cloud workloads are as secure as possible. In other words, better safe than sorry.
Leveraging a multi-cloud strategy for the purpose of increasing availability often means that organizations will be deploying the same cloud workloads across multiple cloud platforms. In this case, it’s important to avoid configuration drift, since it can threaten the consistency and security of the cloud deployment. Configuration drift can be prevented by keeping security policies in sync and leveraging cloud-agnostic infrastructure as code tooling to automate environment setup across cloud platforms. This reduces the complexity of managing services running on different cloud platforms while also helping to mitigate the risk of human error in environment configuration. It’s also a best practice to make sure that all IaC templates in use are thoroughly vetted and regularly reviewed to root out misconfigurations that may lead to cloud deployments with security shortfalls.
Multi-cloud is still a relatively new concept. Combine that with the complexities involved in its implementation and the rapid pace of its adoption, and it's easy to see why developers and IT folks have to stay up to speed when organizations go multi-cloud. Ensuring that your teams are familiar with the latest practices and innovative tooling will help enable them to maintain a scalable, flexible, and secure multi-cloud architecture.