Cloud adoption is growing significantly as more enterprises see the business value of having a scalable, elastic pool of computing resources at their fingertips. However, enterprise CIOs are concerned with building application silos in the cloud that don’t integrate with the rest of their systems, data, and infrastructure. One survey asked respondents to rank their areas of satisfaction for a set of SaaS applications and found that integration with on-premises systems was the area with the most frustration. Another survey found that 67% of CIOs reported problems integrating data between cloud applications. The long-term competitive advantage you gain from the cloud will likely depend – in part – on how well you can connect your assets, regardless of location. There are unique considerations for integrating with the cloud, but the core business needs remain the same. We at CenturyLink Cloud see four areas that require focus from both the cloud provider and the customer.

Application Integration

Each application – whether packaged or custom built – serves a unique functional purpose. Frequently, information from another applications is required to meet this purpose. For example, a CRM system may submit a query to an accounting system so that a call center agent can get a full picture of the customer’s billing history with a company. Or, an application that validates employee security badges may rely on a real-time feed of data from an ERP system that stores employee status information. Application integration is about connecting business applications at a functional level. It’s not simply data sharing, but rather, involves triggering some activity in another application by issuing requests or sending “live” business events.

So how does this affect applications in the cloud? Architects are wary of attempting synchronous remote procedure calls across the Internet. Latency is a big factor, and synchronous actions don’t scale particularly well.One alternative approach: “callbacks” where the application request is issued asynchronously, and the reply is sent to a pre-determined location that is monitored by the calling application. Or, embrace the more scalable asynchronous messaging strategy where business data is sent between systems using a fire-and-forget technique. Whether synchronous or asynchronous, application integration with cloud endpoints involves a high likelihood of encountering REST (vs. traditional SOAP) web service endpoints, so choose your tools accordingly!

To this end, you’ll come across two types of application integration products: traditional platforms that have been extended to work with the cloud, as well as entirely new platforms that are built and hosted in cloud platforms. Because each CenturyLink Cloud customer gets their own VLAN(s) that can connect to the corporate network (see Network Integration below), it’s relatively straightforward to use existing on-premise integration servers (e.g. Microsoft BizTalk Server, TIBCO ActiveMatrix Service Bus, IBM WebSphere MQ) to link to applications running in the CenturyLink Cloud cloud.

If you’re looking to do application integration between SaaS applications and servers in the CenturyLink Cloud cloud, you can either use on-premises integration servers or one of the newer cloud-based tools. For one-way messaging that requires durability but not the weight of an integration server, consider cloud-based queues such as Amazon SQS. Note that CenturyLink Cloud servers don’t receive a public IP address by default, so any integration tool that requires a “push” from the public internet to a CenturyLink Cloud server will require you to add a public IP address to the target server. If you need a full-fledged messaging engine that runs in the cloud and has adapters for cloud endpoints, consider something like the CloudHub from Mulesoft.

Data Integration

Data integration refers to the synchronization, transformation, quality processing, and  transportation of large amounts of data between repositories. Unlike application integration, data integration is typically batch-oriented and works against data that’s already been processed by transactional systems. You’ll often find the need for data integration when doing master data management (MDM) solutions, importing dirty data from a variety of sources, or loading data warehouses for in-depth analysis.

Doing extract-transform-load (ETL) processes in the cloud introduces a few new considerations. While latency may not be as big of a factor for batch processes, bandwidth will be. Moving petabytes of data over an Internet connection is still not a speedy endeavor. Where possible, consider a Cross Connect architecture to maximize bandwidth while minimizing latency. Data integration solutions frequently include staging databases where data is manipulated or standardized as part of the processing pipeline. Depending on where the data is coming from, you may choose to stage sensitive data on your internal network instead of storing it temporarily on public cloud-based servers. Also, keep in mind that data integration tools are oriented towards relational databases, but many cloud databases leverage NoSQL designs or highly distributed architectures that may be unfamiliar to enterprise staff that primarily works with Oracle, Microsoft, and IBM technologies.

As with the application integration tools, the data integration tools market consists of existing players that may offer adapters to cloud endpoints, as well as entirely new providers that are oriented to cloud-based data repositories. Tools like Microsoft SQL Data Sync make it easy to synchronize Microsoft SQL Server databases running in Windows Azure to SQL Servers running on-premises or in public clouds like CenturyLink Cloud. Traditional ETL provider Informatica has an innovative cloud service called Informatica Cloud which includes a growing set of adapters for connecting cloud databases to on-premises databases. Even the Amazon Web Services Data Pipeline service makes it simple to transfer data between AWS databases and on-premises databases. In each case, the ETL tool uses a locally-installed server agent that securely connects the data repositories to your network. This means that you do NOT need to have your internal databases exposed to the public internet in order to synchronize with cloud-based data repositories.

If you run your enterprise databases in the CenturyLink Cloud cloud, you can perform data integration using existing ETL tools or any of this new crop of cloud-friendly products.

Network Integration

Ideally, cloud servers are simply an extension of on-premises servers. To have a fully integrated enterprise landscape, servers in the corporate data center should be able to freely communicate with servers running off-premises. For example, CenturyLink Cloud customers use our cloud to run their enterprise collaboration environment, email infrastructure, line of business applications, and many other critical internal-facing systems. In order for these scenarios to work, the enterprise network must be extended to include the cloud network.

One choice is to set up simple client virtual private networks (VPNs) that connect an individual machine to the cloud network. In this case, an individual user would establish a VPN connection and access the application or database residing on the cloud server. However, this only works well for small businesses or temporary access to applications. For a persistent connection between networks, consider working with the cloud provider on a point-to-point VPN tunnel. This provides a much better end user experience. An even tighter integration is possible through Direct Connect. For enterprises that use one of our co-location partners for their data center hosting, CenturyLink Cloud can establish a cross-connect between the physical hardware. This ensures a high performing connection that doesn’t travel over the public internet channel. If cross-connect isn’t an option, then perhaps a MPLS network mesh with any number of major network carriers is feasible. We can easily add a secure connection from your MPLS network to the CenturyLink Cloud cloud.

Identity Integration

Finally, security. It’s an important consideration when working with distributed systems, and identity management is an oft overlooked area. We’ve all become accustomed to countless credentials for the variety of business systems (on-premises and off-premises) that we use every day. Whether accessing cloud systems, integrating with partner systems, or enabling a remote workforce, a strong identity management strategy is key. How can employees use a single set of credentials to access a diverse range of systems across the Internet? Is centralized role-based-access-control possible or does each application have to maintain their own role hierarchy? These are among the many questions you should ask yourself when figuring out a long term identity strategy.

Identity federation is an emerging area in the cloud. There are multiple standards that come into play, including SAML, XACML, and WS-Trust. Microsoft offers its Windows Active Directory Federation Services and Windows Azure Active Directory products. You’ll also find strong products from Ping Identity and CA. As enterprises face more and more demand by employees and partners to “bring your own identity”, there will be a greater need to invest in a complete identity management solution.

CenturyLink Cloud supports SAML for access to our Control Portal. So, our customers can manage their cloud environment without ever manually logging in. This not only makes it convenient, but also creates a more secure environment where there are fewer passwords to remember and access is controlled from a central location.


By planning for all four of these integration dimensions, enterprises can more fully achieve the benefit of cloud computing while getting maximum reuse out of existing assets. Neglecting any one of these can introduce barriers to adoption or lead to inefficient or insecure workarounds.

Want our help designing your solution for each of these integration dimensions? Contact us to set up a working session with our experienced services team.