This article describes How to Install LXD Hypervisor and Create/Delete/Start/Stop Container on Ubuntu Linux
Linux is an open-source operating system. To really understand what that means, we need to define some terms. An operating system is a layer of software on a computer that acts as a foundation for computer programs. It's the OS's job to monitor computer resources and allocate those resources to programs that need them. When you execute a program, the OS acts like a supervisor and makes sure the program has the processing power, memory and any other resources it might need to function. Operating systems make it easy for program developers to write software -- without an OS, the programmer would have to create software to work directly from the hardware itself.
Ubuntu is a complete Linux operating system, freely available with both community and professional support. The Ubuntu community is built on the ideas enshrined in the Ubuntu Manifesto: that software should be available free of charge, that software tools should be usable by people in their local language and despite any disabilities, and that people should have the freedom to customize and alter their software in whatever way they see fit.
The Ubuntu Project is sponsored by Canonical Ltd. Canonical will not charge licence fees for Ubuntu, now or at any stage in the future. Canonical's business model is to provide technical support and professional services related to Ubuntu. We encourage more companies also to offer support for Ubuntu, and will list those that do on the Support pages of this web site.
Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things
Ubuntu Server is a variant of the standard Ubuntu you already know, tailored for networks and services. It's just as capable of running a simple file server as it is operating within a 50,000 node cloud. Unlike the installation of Ubuntu Desktop, Ubuntu Server does not include a graphical installation program.
Ubuntu Server brings economic and technical scalability to your datacentre, public or private. Whether you want to deploy an OpenStack cloud, a Kubernetes cluster or a 50,000-node render farm, Ubuntu Server delivers the best value scale-out performance available.
LXD is a container hypervisor providing a ReST API to manage LXC containers. It allows running containers and managing related resources, like storage volumes and networks. This tutorial will show how to install and setup LXD on Ubuntu, and how to launch a container and access it.
We can proceed to set up the LXD daemon. To do that, run
sudo lxd init
LXC also known as a Linux Containers is a free, open source, lightweight and operating system-level virtualization software that allows us to run a multiple isolated Linux systems on a single Linux host. LXC provides the cgroups functionality that allows the limitation of resources like, CPU, memory, network without the need for starting any virtual machines. You can start Linux container without using the separate kernel using LXC. LXC allows you to run multiple instances of an operating system or application on a single host, without inducing overhead on CPU and memory. Containers can be used to quickly set up a virtual environment for testing/QA purposes.
You can list the created container with the following command:
lxc list
Images are identified by their hash, but are also aliased. The 'ubuntu' server knows many aliases such as '16.04' and 'xenial'. A list of all images available from the Ubuntu Server can be seen using:
lxc image list
To start a container:
lxc launch
To open a shell in it using:
lxc exec
To stop running container:
lxc stop
To start stopped container:
lxc start
To delete container:
lxc delete
Now you can find some examples in this video.
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