The result is a container provides workload isolation and portability. This is really well highlighted technically in this forum answer: It shares with the host in a ring-fenced manner.
A full operating system is installed so the VM only shares underlying hardware with the host.Ī Container (the container OS and Apps running on it) is and running entirely in the application layer. Applications can then be ran on the VM which are compatible with the guest OS (regardless of the host). See the following post and find the other posts in the series on his blog:Ī VM is a guest OS which is installed on the host OS on a hypervisor (Virtual Machine Manager). Ian Lewis is a Developer Advocate at Google and has produced the best / most accessible content on the topic. There is other container software and container runtimes (and it’s quite a confusing topic) but docker is the most popular. Docker will provide a lightweight, throwaway environment with the added benefit of learning more about docker its self.
It does need to be unix for all of the common CLI tools which are assumed. Lots of RHCSA tasks can be performed on any unix-like environment. The recent release of RHEL8 in May, 2019 comes with a ‘Universal Base Image’ for containers: This you will likely install in a VM following this guide: Docker Docker Registry could be hosted by a third party as a public or private registry, like Docker Hub.The material requests a Red Hat Enterprise Linux 8 environment. Docker Registry : Docker images can be stored in order to be publicly or privately in a Docker registry. The docker containers on the other hand are spun-off from docker image and adds a read-write layer on top of it. Docker Containers : The docker images are read-only and stateless. These files in the Docker image are read-only and hence the content of the image cannot be altered. Docker Images : It is a collection of files like libraries, binaries, and other dependencies just needed to run the application. Enterprise Edition (EE) : Officially supported and paid version from Docker. Community Edition (CE): do-it-yourself, community supported version of Docker that’s available for free of cost. Docker Editionsĭocker is available in 2 editions namely: 1. It is also supported on many cloud platforms, such as Amazon EC2, Rackspace Cloud, and Google Compute Engine. Docker is supported on many Linux platforms, such as RHEL, Ubuntu, Fedora, CentOS, Debian, Arch Linux, and so on. Docker is a container-management system that helps us easily manage Linux Containers (LXC) in an easier and universal fashion.
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