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The primary reason behind the move was not wanting to manage CI. Since there were no options for a managed Concourse in 2018, we migrated to Circle, one of the Changelog sponsors at the time.
Concourse worked well for us, we didn't have any issues that were being enough to remember. You may be interested in this screenshot that captured the changelog.com pipeline from 2017: https://pipeline.gerhard.io/images/small-oss.png
I missed the simple Concourse pipeline view at first, but CircleCI improved by leaps and bounds in 2020, and the new Circle pipeline view equivalent is even better (compared to Concourse, clicking on jobs always works): https://app.circleci.com/pipelines/github/thechangelog/chang...
The Circle feature which I didn't expect to like as much as I do today, is the dashboard view (list of all pipeline/workflow runs). This is something that Concourse is still missing: https://app.circleci.com/pipelines/github/thechangelog
My favourite Circle 2020 feature is the Insights: https://app.circleci.com/insights/github/thechangelog/change.... Yup, we were one of the first ones to ask for it in 2019.
In 2021, I expect us to spend one migration credit on GitHub Actions, as a Circle replacement. Argo comes as a second close, but that requires an innovation credit which is more precious to us. Because we are already using GitHub Actions for some automation, it would make sense to consolidate, and also leverage the GitHub Container Registry, as a migration from Docker Hub. Watch https://github.com/thechangelog/changelog.com to see what happens : )
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K8S is an API that the majority is agreeing on, which is rare. There is a lot of amazing tooling, a staggering amount of ongoing innovation, all built on solid concepts: declarative models, emitted metrics (the /proc equivalent, but with larger scope) and versioned infrastructure as data (a.k.a. GitOps).
For someone that is known as the King of Bash (self-proclaimed) - https://speakerdeck.com/gerhardlazu/how-to-write-good-bash-c... - and after a decade of Puppet, Chef, Ansible and oh wow that sweet bash https://github.com/gerhard/deliver - even if all my workstations and work servers (yup, all running k3s) are provisioned with Make (bash++), I still think that K8S is the better approach to running production infrastructure. The advantage to using simple and well-defined components (e.g. external-dns, ingress-nginx, prometheus-operator etc.) that adhere to a universal API, and are maintained by many smart people all around the world, is a better proposition than scripting in my opinion.
At the end of the day, I'm in it for the shared mindset, great conversations and a genuine desire to do better, which I have not seen before K8S & the wider CNCF. I will go on a limb here and assume that I love scripting just as much as you do, but go beyond this aspect and you will discover that it's more to it than "thin install scripts that deploy containers" (which are not just glorified jails or unikernels).
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