VMs Vs Containers : Difference Between VMs and Containers

by StarAgile

June 09, 2021
Category DevOps


DIFFERENCE BETWEEN VMs AND CONTAINERS

DevOps is an ideology, a culture, and a range of techniques. It improves the stability, integration, and automation between all the people necessary to prepare, design, test, deploy and deliver a solution. 

If you have started to learn about virtualization tools, you may wonder how the technological debate on the difference between VMs and Containers. Containers are now a significant player in cloud-based development, so understanding these is essential. 

Although container and VMs are different and have unique features, they are also related in that they both increase IT performance, enhance DevOps and the lifecycle of software development. DevOps Certification Training contributes to more excellent performance.

Difference Between VMs and Containers:

Virtual machines and containers both allow the deployment of multiple, independent services on a single platform. Both virtual machines (VMs) and containers can assist in maximizing the use of available system hardware and software tools. 

While containers are the newcomers, virtual machines have been and continue to be extremely popular in computer servers of all sizes. Be sure that you clearly understand virtual machines and containers' principles and working strategies before embracing container-based development services for application development and software delivery processes. 

Serial
Virtual Machines
Containers
1Virtual machines are a set of hardware-based guest operating systems that are implemented by a hypervisor.
Containers are a type of application that emulates several virtual environments sharing a single kernel.
2Since each virtual machine in traditional virtualization has its complete operating system, and memory usage can be higher than required when running applications installed into virtual machines.
Containerized programs share an operating system (kernel) environment, consuming fewer resources and putting less pressure on the host's memory than complete virtual machines.
3A significant amount of disc space can be occupied by traditional virtual machines.
Containers are lightweight.
4They have a complete operating system and associated tools.
They contain only the libraries and resources required to run the containerized program, making them more lightweight and faster to start than VMs.
5When it comes to operating system updates or patches, traditional VMs must be upgraded one at a time.
With containers, only the container host's operating system must be upgraded. This greatly simplifies maintenance.
6A virtual machine (VM) is a piece of software that enables you to install other software within it, allowing you to control it virtually rather than installing it directly on the system.
A container is a software program that enables an application's various functionalities to run independently.
7VM system applications can run multiple OS.
In a container system, applications operate on a single operating system.
8Since virtual machines run on a separate OS, it isn't very easy to port a virtual machine.
Containers are conveniently portable due to their lack of distinct operating systems.
9Deployment takes a while because each instance is responsible for execution.
Deployment is easy, as a single containerized image can be used on all platforms.
10Virtual machine virtualizes a computer system completely.
A container, on the other hand, virtualizes only the operating system.
11The size of the virtual machine is enormous.
While the container is very small, it is just a few megabytes in size.
12Due to the VM's size, it takes several minutes to boot.
While containers run in a matter of seconds.
13VM consumes a significant amount of system memory.
But containers consume significantly less amount of memory.
14The virtual machine is more stable and secure.
Containers, on the other hand, are less stable.
15Virtual machines are advantageous when we require the entire OS's resources to run multiple applications.
Containers are advantageous when we need to maximize the performance of running applications while using the least number of servers.
16KVM, Xen, and VMware are all examples of virtual machines.
Containers include RancherOS, PhotonOS, and Docker containers.

 You can also see the difference between docker and virtual machines in detail here. DevOps Training assists in integrating the development and operations processes to achieve the best delivery system possible.

What Is A Virtual Machine?

  • A Virtual Machine (VM) is a software application that simulates the operation of computer hardware or a physical computing system. 
  • In simple words, VM allows you to run multiple distinctive devices on a single computer's hardware.
  • Virtual machines work with physical computers through lightweight software patterns called Hypervisors. These hypervisors can isolate virtual machines from one another and share resources such as processors, memory, and storage. 
  • Additionally, the VM can contain the device binaries and libraries required to run the apps. The hypervisor manages and executes the operating system (OS) on the host computer.

The architecture of a virtual machine can be divided into four distinct parts:

  1. The physical computer and its operating system are part of the underlying system (Hardware/Infrastructure). At this layer, bare-metal hypervisors do not need an underlying operating system.
  2. A hypervisor is a software layer that exists between the hardware and the associated infrastructure systems.
  3. Multiple virtual machines (VMs) that interact with the hypervisor to access the host's resources.
  4. Every guest's operating system has its set of applications and processes.

Until deploying any virtual machines, the hypervisor must be configured appropriately. Administrators can build virtual machines via a command-line interface using KVM, a Linux-based open-source virtualization technology.

What Is A Container?

  • Containers are a type of virtualization for the operating system. 
  • A single container can run anything from a simple microservice or program operation to an extensive application. At the app layer, they're an abstraction that combines package code and dependencies. The host OS kernel, and the binaries and libraries, are shared by the containers. Containers are incredibly lightweight. These are only a few megabytes in size and boot in a matter of seconds.
  • To run a specific program, a container requires an OS, supporting systems and libraries, along with computing resources. 
  • When working within a container, it is necessary to build a template for the environment you need. 
  • The container runs a snapshot of the device at a specific point in time, ensuring that an application performs consistently. 
  • The container utilizes the host's kernel to run all of the container's applications. Each container requires only binaries, libraries, and other runtime elements.

VMs Vs Containers

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Conclusion:

Both virtual machines (VMs) and containers play a very significant role. Containers can operate on virtual machines (VMs), allowing them to use their existing automation, monitoring, and backup resources. Containers on VMs enable IT to work in containerized environments using existing VM-savvy teams.

The benefit of the DevOps Course is to provide more stable operating environments. If the process of DevOps Learning is continued, it can result in customer satisfaction from revenue. 

StarAgile institute provides DevOps training online which discusses the VM's and Containers in detail.