Then sends them to the specified Docker registry. This tool, written in Go, it collects images of containers from a Dockerfile without a Docker. That’s why we didn’t want to touch Docker-in-Docker. But at the same time there are problems with security: for example, you have to work with different file systems (host and container) or use the build cache from the host system. To do this, run the container in privileged mode - to gain access to the host system. That is, if you want to run the Docker-daemon in a container, you need to use nested virtualization. A docker daemon is a virtualized environment, and the container in Kubernetes is virtualized by itself. To collect container images in Docker, we need a running Docker daemon in the container, that is, Docker-in-Docker. ) in a container, we need something like Docker-in-Docker. If now we want to use Docker (for example, docker build. Typically, the Docker CLI is used directly to implement these functions:īut in the Kubernetes cluster, we host containers based on small and elementary Linux images, in which the Docker is not included by default. Secondly, to implement sending the collected images to the Docker private registry. In the public Docker Hub, there are two functions that we are especially interested in.įirst, we wanted to create a queue that would asynchronously collect Docker images at Kubernetes. We in the native web have quite a few Docker private images that need to be stored somewhere.
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Finally, we will learn how to set up image assembly in a Kubernetes cluster.Ī general description of Kubernetes is in the book "Kubernetes in Action" ("Kubernetes in action"). We will also talk about Docker-in-Docker and its alternative - kaniko, with which you can collect Docker images without using Docker. What is convenient, consider the real example, so clearer. Suppose you decide to collect Docker images in a Kubernetes cluster (well, that's necessary). Let's learn how to run kaniko locally and in the Kubernetes cluster. You can use kaniko to collect Docker images in a container while doing without Docker.
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