This is a comprehensive list of the terms used when discussing the functionalities and the configuration options of LXDock.
- Or Linux containers. Whenever we use the term “container”, we are referring to LXD containers. LXD focuses on system containers / infrastructure containers and thus provides an elegant solution to the problem of how to reliably run software in multiple computing environments (eg. for development or tests execution).
- An image (or container image) is necessary to build a container. Basically container images embed a snapshot of a full filesystem and some configuration-related tools. All containers are built from “local” images; but images can also be pulled from a remote image server (the default LXD’s image server is at https://images.linuxcontainers.org/). This a good option because users don’t have to manage their own images but they have to trust the image server they are using!
- LXC stands for “Linux containers”. It is a technology that allows to virtualize software (which can be an entire operating system) at the operating system level, within the Linux kernel.
- LXD can be seen as an extension of LXC. It’s a container system that makes use of LXC. It provides many tools built around LXC such as a REST API to interact with your containers, an intuitive command line tool, a container image system, …
- Privileged container
- Privileged containers are containers where the root user (in the container) is mapped to the host’s root user. This is not really “root-safe” and could lead to potential security flaws. That said it should be noted that privileged containers come with some protection mechanisms in order to protect the host. You can refer to LXC’s documentation for more details on this topic.
- Unprivileged container
- Unprivileged containers are containers where the root user (in the container) is mapped to an unprivileged container on the host. So the user that corresponds to the container’s root user only has advanced rights and permissions on the resources related to the container it is associated to.