Alternative of Docker in Kubernetes

Since v1.6.0, Kubernetes has enabled the use of CRI, Container Runtime Interface, by default. The container runtime used by default is Docker, which is enabled through the built-in dockershim CRI implementation inside of the kubelet.

Other CRI-based runtimes which can be Alternative of Docker in Kubernetes include:

containerd (CRI plugin built into containerd) – cri is a containerd plugin implementation of Kubernetes container runtime interface (CRI). With it, you could run Kubernetes using containerd as the container runtime. cri is a native plugin of containerd 1.1 and above. It is built into containerd and enabled by default.
More info – https://github.com/containerd/cri

cri-o – CRI-O is meant to provide an integration path between OCI conformant runtimes and the kubelet. Specifically, it implements the Kubelet Container Runtime Interface (CRI) using OCI conformant runtimes. The scope of CRI-O is tied to the scope of the CRI.

More Info – https://github.com/kubernetes-sigs/cri-o

frakti – Frakti lets Kubernetes run pods and containers directly inside hypervisors via runV. It is light weighted and portable, but can provide much stronger isolation with independent kernel than linux-namespace-based container runtimes.

More Info – https://github.com/kubernetes/frakti

rkt – rktlet is a Kubernetes Container Runtime Interface implementation using rkt as the main container runtime. rkt is an ongoing CNCF effort to develop a pod-native container runtime. The goal of this project is to eventually supplant the rkt package in the main Kubernetes repository.

More info – https://github.com/kubernetes-incubator/rktlet

Rajesh Kumar
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