Apr. 17, 2020
Leveraging CircleCI to Build a CI/CD Pipeline For The Healthline Media Activation Platform
Healthline Media, a TrackIt AWS Managed DevOps customer, was in need of a CI/CD pipeline for its Healthline Activation Platform packaged in a Windows Docker container.
Healthline leverages CircleCI for all of its existing CI/CD pipelines and wanted the Activation Platform (which up until that point was using Jenkins) to conform to the same standards in order to maintain its normal processes and maximize efficiencies.
“We wanted to streamline the CI/CD pipeline so that it matches what we do everywhere else and also remove the need for an in-house maintained Jenkins server. That was the main driver for us to switch from Jenkins to CircleCI.” — Pierre Grandin, Lead Infrastructure Engineer, Healthline Media
Having already collaborated with TrackIt on previous projects, Pierre Grandin, Lead Infrastructure Engineer at Healthline Media was confident seeking the TrackIt team’s expertise in building this pipeline despite the challenging nature of a Windows container project.
“Victor [DevOps engineer at TrackIt] has worked on a few different projects for us and it went well every time! He was already quite familiar with the project itself, the technologies involved, and the team involved with it. All of this made it very easy for him to start working on the project. For me, it was a no-brainer to ask Victor to work on this for us.” — Pierre Grandin, Lead Infrastructure Engineer, Healthline Media
Strategies Considered to Build the CI/CD Pipeline
Due to the novelty of Windows containers, the Healthline and TrackIt teams considered two separate strategies to build the pipeline — each with its own advantages and disadvantages:
Advantages: The server is highly-customizable and can be kept dry so no update breaks the build in an unforeseen way.
Disadvantages: The server requires maintenance and does not conform to the build pattern used by all the other CircleCI-based projects.
Advantages: A SaaS solution is low maintenance and requires a smaller initial effort to deploy
Disadvantages: Windows containers are relatively new and come with a few caveats (which we’ll describe in the following sections) .
The teams decided to go with the CircleCI SaaS solution approach since it fit homogeneously into the build pipeline for all of Healthline’s projects.
CircleCI’s lack of documentation for Windows containers was an obstacle that the TrackIt team had to overcome. A considerable amount of trial and error was required to resolve several issues due to a lack of adequate documentation.
The available documentation only consisted of a “hello world” pipeline and a list of installed software. The following is the example pipeline that was provided:
One of the challenges encountered was figuring out how the PATH env var worked between Windows and bash, since from within bash the path to C:\ is not formatted the same way as Windows PATH env var. For example, here’s how to add a dependency to the path from within bash:
The TrackIt team also had to navigate through another issue that has more to do with Windows Containers than CircleCI — the fact that Windows containers are version dependent. This means that the Windows instance (in our case, an ECS Windows instance node) must be at least up to date with the version of Windows where the container was built. This version dependency could also pose problems in the future if CircleCI was to update its version of Windows — since the containers would not start with an older version of Windows.
This issue was addressed by looking at the build number of the Docker image created by CircleCI and matching it with the corresponding AMI on the Windows ECS cluster nodes. AWS provides a list of all Windows AMI ids, matching them with Windows build versions: https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/windows-ami-version-history.html.
Since CircleCI doesn’t provide the exact Windows build number, it had to be extracted from the Docker image.
Diagram of the Build Pipeline
Breakdown of the Implemented Pipeline
This step takes the longest amount of time (about 8–9 minutes) since the base docker image needs to be pulled each time (about 2–3 GB to download) and is not cached by CircleCI.
Breakdown of Time Taken by Each Step in the Build Pipeline
“In our ongoing engagement with Healthline, TrackIt has successfully completed the streamlining of challenging workflows that not only improve Healthline’s operating environment but also expands TrackIt’s own expertise. It has been mutually very successful and we look forward to our continued partnership” Ludovic Francois, TrackIt CEO
About Healthline Media
Healthline is the fastest growing health information brand with offices in San Francisco, New York, and the UK. Our vision is to create a stronger, healthier world. Through our three properties — Healthline, Medical News Today, and Greatist, every member of our team works to provide the best news, tools, and information to our consumers. As the #1 health site in the US (per Comscore), we reach over 250 million people a month globally.
TrackIt is an Amazon Web Services Advanced Consulting Partner specializing in cloud management, consulting, and software development solutions based in Venice, CA.
TrackIt specializes in Modern Software Development, DevOps, Infrastructure-As-Code, Serverless, CI/CD, and Containerization with specialized expertise in Media & Entertainment workflows, High-Performance Computing environments, and data storage.
TrackIt’s forté is cutting-edge software design with deep expertise in containerization, serverless architectures, and innovative pipeline development. The TrackIt team can help you architect, design, build and deploy a customized solution tailored to your exact requirements.
In addition to providing cloud management, consulting, and modern software development services, TrackIt also provides an open-source AWS cost management tool that allows users to optimize their costs and resources on AWS.