The emergence of virtualization started a new era of modern computing with improved system utilization, applications decoupling from the underlying hardware, and enhancing workload mobility & protection. Virtualization in its both forms, Container and VM’s allow multiple operating systems to run on a single physical machine.
Even though containers expedite rapid, agile development, questions are still raised on how they differ from virtual machines?
Containers and virtual machines -two distinctive approaches to set up multiple and segregated administrations on a solitary stage, where a Container framework requires a crucial OS that offers help for the separation; then again, a VM has its own OS utilizing VM support hardware. For better understanding, we can state that a VM resembles a house which is independent and shields from interlopers. So also, a container can be identified with a condo building, which despite the fact that offers insurance, must impart the foundation to different condos.
What are Virtual Machines (VMs)?
A Virtual Machine is a software/firmware that sits between the OS and the hardware to virtualize the server. Each VMs runs on its own unique OS, and VMs with different OS can be run on the same physical server. Along with VMs comes a software component named hypervisor, which acts as an agent between the VM environment and the underlying hardware and provides the necessary layer of abstraction. The size of the VMs can be in gigabytes as each VM has its own libraries and applications that it services and they need a guest operating system to run. This quickly adds up to a lot of RAM and CPU cycles.
What are Containers?
Containers provide a way to run the software predictably and on a single server/host OS when moved from one server environment to another. Containers share the host OS, its binaries and libraries too. Shared components of a container are read-only, which makes it extremely light. The highlight of containers is their speed and lightweight nature. In addition, many more containers can be put onto a server than onto a traditional VM.
Difference between Containers and VMs
Though it seems to be the same, containers and VMs are unique in their own ways. Let’s see the difference between them.
- Containers and VMs vary in their size. Containers involve less space (megabytes) contrasted with VMs, which possesses estimate in gigabytes.
- The speed of Containers is higher contrasted with VMs. Containers will take seconds to begin thinking about of VMs, which will take minutes.
- More containers can be possibly facilitated by an OS than a VM.
- The administration costs of your organization will diminish utilizing Containers set up of VMs as containers share basic working framework.
- The user can’t run a container with guest OS on an alternate OS conveying host, not at all like VMs which can be keep running with an OS on some other host OS.
- Containers are more asset proficient than VMs since the need of extra assets for every OS is dispensed with.
- Danger of single point disappointment is high in containers and any malware assault on the host OS will influence every one of the containers
- Not at all like containers, a VM is a software-based condition custom-made to mimic an equipment based condition, for the applications it will have
Just because containers are more popular these days, don’t think that VMs are out dated. No, they are not! There is a lot more to VMs than just how many apps you can put in a box.
Containers do come with its own disadvantages; the main one is Security.
Reports say that more than 80% of all cyber-attacks are specifically targeting software applications rather than the network and any attack targeted to a container can cause the entire network to crash.
The smartness of a container is breaking deployments into more functional discrete parts, but that also means that we have MORE PARTS to manage.
What to use – Containers or VMs?
You can use a container if your requirement is to run multiple copies of a single app, say MySQL, keeping in mind that you must be alert and focused on your systems running containers until container security is locked down.
If you want the flexibility of running multiple applications, you can use a virtual machine.
Companies these days tend to use containers inside a VM. Docker, for example is the child of virtualization and containerization which utilizes virtualization technology in the Linux kernel to create containers.