LxC can only isolate not just your installed applications, but even the entire OS. How They Workĭocker is really an extension of LxC, which is itself a sort of supercharged Linux chroot. However, Vagrant is still a virtual machine, albeit one with more powerful features than the bog-standard VM tools out there for instance you can integrate Vagrant with CM tools such as Puppet and Chef to provision your own VM setups and configs. However, default support is only included for VirtualBox, for the other providers you must first install their plugins ( ). It is designed to run on top of almost any VM tool – VirtualBox, VMWare, AWS, etc. It allows you to script and package the VM config and the provisioning setup. Vagrant, an open-source product released in 2010, is best described as a VM manager. Because of the shared kernel, Docker’s isolation is not as good as a full VM’s, but it suits many people just fine. It places only a little extra load on the system, so unlike the traditional VM there is very little overhead when using Docker. A VE is VM-lite it rides on the already existing kernel’s image of the underlying hardware, and only creates a ‘container’ in which to run your apps, and even recreate the OS if you want since the OS is also just another app running on the kernel. So unlike a VM, a VE like Docker doesn’t create its own virtual computer with a distinct OS and processors and hardware emulation. It builds on LxC (LinuX Containers), which uses the cgroups functionality to enable creation and running of multiple isolated Linux virtual environments (VE) on a single control host. What They Areĭocker, previously called dotCloud and open-sourced in 2013, is a Linux-only virtual environment (VE) tool, not a VM tool. And Docker and Vagrant are two such solutions that take different roads to solving the limitations of the traditional VM. Is there a better way of doing this? As it turns out yes, although with some caveats. This is inefficient – oftentimes what you really want to recreate is just the OS platform and some apps. You see, a virtualizer works by creating a package or image containing an entire OS and machine setup, including hard drive, virtual processors and network interfaces. As you can imagine, VM images eat up a lot of space and time.īut, an intelligent person observed how VM’s operate and decided that the model needed improvement. Manually creating a full VM on today’s virtualizers, like VMWare and Hyper-V, is a painful process because these products take a snapshot of the entire machine configuration, and then replicate this to another machine. With the huge growth in virtualization and cloud computing, there has also been a corresponding increase in the average number of virtual machines (VM) that today’s admin has to manage.
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