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Docker is awesome, but what is even more awesome about UNIX philosophy is that you can use combine small tools to create a something that work like docker. Actually Dockerlite used BTRFS and LXC to make a toy version of docker. In this post we are going to discuss show how one can pull a Docker image and run the containers without a docker daemon, of course we do this for fun. We are going the achieve the following: ability to pull docker images space efficient  storage of images and containers even better that docker (not just reuse layers, but even files) run the container We are going to use OSTree : content addressable storage, git-like for OS Images, space efficient and uses hardlinks Skopeo : a way to pull all kinds of images and convert them to all kinds of storage Runc (or any OCI runtime like bubble wraps oci ) In this post we are going to run everything as non-root regular user (to make it even more challenging) let's create a bare OSTr...

Introduction Kubernetes had won the container orchestration war. Here is a summary of its features. It's an API, command line and UI. It uses etcd to keep its state. Every thing is done via Yaml or JSON (your choice). General Node : a machine or instance (used to be called "minion") Namespace: a grouping of resources Label: a tag applied to a resource ex. role=frontend Annotations: another form of meta data  Workloads Container  ( spec ) : the building block of deployable service or runnable task using linux containers ex. docker image and params to pass at runtime. Typically created in a Pod see below Pod  ( spec ) : one of more containers scheduled to nodes together and thus can share volumes. Most common pods have a single container but there are use cases for more (ex. nginx and php-fpm) . If you replicate a pod to have 3 replicas it would have 3 nginx and 3 php-fpm. If php-fpm created a file in the volume, nginx can see it. Typically cr...