Thursday 27 January 2022
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Using Containers to “Cloudify” your Legacy Applications

Using Containers to “Cloudify” your Legacy Applications

Many industries continue to be reliant upon legacy applications and depend on the devil they know, but there are many organizations that are proving that legacy app modernization can be done for improved performance and to add cloud benefits. This amazing feat is possible with the use of containers to help ease the burden of operations support.

It can be costly and time-consuming and potentially risky not to update or replace your legacy applications.  Many and most large enterprises run some form of a legacy application. But failing to modernize out-of-date systems can ultimately damage app performance via slow runtime speeds and poor load balancing.

The theory is that if you move legacy apps into containers it ensures that your applications and the business that relies on them will continue without issue. The challenge exists that the transfer may not be smooth and will require some time and expertise. Sometimes, they’re only said and are never done at all.

During the DockerCon 2017 event, docker stated it takes at most five days to port most applications into a containerized environment, although the company also makes it clear this isn’t the entire process. It’s only the first step, and it can be intimidating to take if a given app is old or undocumented.

There are long-term benefits to putting an old-school business app into a container as-is without changing how it works. For one, the app’s lifecycle becomes easier to modernize, as Microsoft Azure CTO Mark Russinovich pointed out.


There are many benefits to using containers with legacy applications




Deployment becomes much easier: replacing the whole container image with a new one.

 Yes Relatively easy to automate deployments, even having them driven completely from a CI (continuous integration) system.
 Yes Rolling back a bad deployment is just a matter of switching back to the previous image.
 Yes Very easy to automate application updates since there are no “intermediate state” steps that can fail (either the whole deployment succeeds, or it all fails).
Yes The same container image can be tested in a separate test environment, and then deployed to the production environment. You can be sure that what you tested is exactly the same as what is running in production.
 Yes Recovering a failed system is much easier, since a new container with exactly the same application can be automatically spun up on new hardware and attached to the same data stores.
 Yes Developers can also run containers locally to test their work in progress in a realistic environment.
 Yes More efficient use of hardware, by running multiple containerized applications on a single host that ordinarily could not easily share a single system.
 Yes Containerizing is a good first step toward supporting no-downtime upgrades, canary deployments, high availability, and horizontal scaling.

Containerization helps legacy apps and businesses in many ways

While it requires some up-front work, containerizing a legacy application will help you get control of, automate, and minimize the stress of deploying it. It sets you on a path toward modernizing your application and supporting no-downtime deployments, high availability, and horizontal scaling.

Telliant’s team has undertaken this process many times in addition to building containerized applications from the ground up.  If you’d like to get on the path to modern and stress-free deployment of your applications, you can benefit from DevOps and Containers and cloudifying your applications.

More Articles about Containers and Legacy Applications:

Docker, Microsoft, HPE partner to port legacy apps to containers

Docker brings containerization to legacy apps

Introducing the Modernize Traditional Apps Program

From containers to microservices: Modernizing legacy applications

Legacy processes are holding back your digital business



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