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In this blog post, we’ve covered the difference between the Virtual Machine vs Docker vs Physical Host which is the first and important topic you should understand before start learning Docker & Kubernetes.
In this video, I will be discussing the difference between the Virtual Machine vs Docker vs Physical Host.
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Difference Between Docker and VM
The major difference between the VMs and Container is In VMs a hypervisor is used to virtualize physical hardware. Each VM contains a guest OS, a virtual copy of the hardware that the OS requires to run while in Containers Instead of virtualizing the underlying hardware, containers virtualize the operating system so each container contains only the application and its libraries.
1) Operating System: In virtual machine has its guest OS above the host OS, which makes virtual machines heavy. While in multiple containers share the host OS, and that is why they are lightweight.
2) Security: VM does not share OS, and there is strong isolation in the host kernel. Hence, they are more secure as compared to Containers. A container has a lot of security risks, and vulnerabilities because the containers have a shared host kernel.
3) Performance: Containers are lightweight and consume fewer resources While VM is heavy and consumes more resources so containers give better performance then VM.
4) Portability: Containers are easily portable because they do not have separate operating systems. While virtual machines have separate OS, so porting a virtual machine is very difficult.
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Difference Between Physical Server and VM
A virtual machine (VM) is used as a copy of an actual physical computer. A virtual server operates in a multi-tenant environment, meaning that multiple VMs run on the same physical hardware. Physical server runs a single application, these generally provide applications and data for a single tenant. The resources and components of a physical server are not shared between multiple users.
1) Performance: Physical server also known as a bare-metal server. the performance of the bare-metal server is better than the virtual machine because the physical host is dedicated to a single host/application while in VM multiple application uses the same resources.
2) Cost: Building and maintaining a physical server environment is very expensive because due to the constant hardware and software upgrades, frequent system failures. On the other hand, A virtual server environment allows you to distribute resources among all running VMs, thus ensuring capacity optimization for a minimal price.
3) Disaster Recovery And High-Availability: Virtual machines have a definite advantage when compared to running workloads on physical servers in terms of DR and HA. In a physical server, it is very hard and very costly to do disaster recovery while in VM we can easily perform DR via cloud vendor VM machine in different regions.
4) System Recovery: It is essential to quickly restore mission-critical data and operations in case of any disaster so as to reduce system downtime. It can take several hours or days to restore applications running on a physical server. You can restore the entire VM at a DR site with the help of previously created VM backups, resulting in almost zero downtime.
- [Video] Containers (Docker) & Kubernetes In Azure For Beginners
- Certified Kubernetes Administrator (CKA) Certification Exam: Everything You Must Know
- Certified Kubernetes Administrator (CKA) Certification: Step By Step Activity Guides/Hands-On Lab Exercise
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