At the same time that Docker offered to donate its containerd technology to the Cloud Native Computing Foundation (CNCF), CoreOS did the same with its competing rkt. Containerd (pronounced “container dee”) and rkt (say “rocket”) are both container runtime facilities, managing container images, a key component of cloud native computing.
Both can work for any number of container managers, but the CNCF is probably best known as the open forum overseeing the development of Kubernetes, the container manager that Google devised in 2014 and donated to the CNCF in 2015.
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