Unless you've been hiding under a rock in a datacenter from the last century, chances are you've heard of Docker, the leading software container solution on the market. And if so, you've likely heard of its chief competitor CoreOS as well. Let's see how the two stack up in this comparison.
This is a clash of virtualization titans: one virtual machine, the other a containerization technology. In reality, both are complementary technologies—as hardware virtualization and containerization each have their distinct qualities and can be used in tandem for combinatorial benefits. Let’s take a look at each to find out how they stack up against each other, as well as how the two can be used in tandem for achieving maximum agility.
In a few short years DevOps has gone from a fringe movement to a must-have for any IT leader. There's a lot of buzz around it, but there's alot of practical knowledge in there as well. Provisioning environments, deploying applications, maintaining infrastructures--these are all critical yet delicate tasks traditionally done by hand. What if we could get a machine to do all that stuff for us, not just saving hours of work but also removing the element of human error?
With the huge growth in virtualization and cloud computing, there has also been a correspondent increase in the average number of virtual machines (VM) that today’s admin has to manage. Manually creating a full VM on today’s virtualizers, like VMWare and Hyper-V, is a real pain because they have to take a snapshot of the entire machine config, and then replicate this to another machine. As you can imagine, VM images eat up a lot of space and time.
Shipping Containers and Compute? LXC (LinuX Containers) is a OS-level virtualization technology that allows creation and running of multiple isolated Linux virtual environments (VE) on a single control host. These isolation levels or containers can be used to either sandbox specific applications, or to emulate an entirely new host. LXC uses Linux’s cgroups functionality, which was introduced in version 2.6.24 to allow the host CPU to better partition memory allocation into isolation levels called namespaces . Note that a VE is distinct from a virtual machine (VM), as we will see below.