Advantages of Virtualization
Before virtualization technology became widespread, it was common practice to build one server environment for one server, and as the number of server environments required increased, so did the number of servers.
In recent years, a server environment construction technology that is not bound by a physical configuration has emerged. With the advent of "server virtualization technology," it is now possible to build multiple server environments on a single server. In addition, those server environments can run different server operating systems on the same server.
In some cases, different versions of Windows, Linux, and other operating systems can be mixed and matched on a Windows server. Let's take a look at the benefits of this server virtualization technology.
Let's take a look at the three advantages of server virtualization.
Reduction of Installation Costs
In the conventional system development, when the OS selected depending on the development time and its version differed, a server was procured each time, but with the use of virtualization technology, different OSes can be installed on the same server. It is now possible to stand up and operate each system. As a result, not only hardware procurement costs but also human costs such as setting work can be reduced.
Reduction of server maintenance costs
Server maintenance costs (rental costs, electricity costs, maintenance costs, etc.) can be reduced if a large number of systems can be operated with a small number of servers using server virtualization technology.
Realization of BCP measures by facilitating replication
BCP is a business continuity plan, and it determines in advance how to continue business in the event of an emergency such as a disaster. Once the server virtual environment is in place, the encapsulated virtual server environment can be replicated to a backup site in a remote location along with the capsule, enabling quick switching to the backup site in an emergency and minimizing business continuity risks.
Advantages of Docker
Docker is a platform for building a containerized virtualization environment, actually it is one of the methods of virtualization.
In this article, we will explain Docker in an easy-to-understand manner, focusing on its advantages. We hope you will read this article to the end, as this knowledge is definitely useful for all engineers.
Easy environment construction
One of the advantages of "Docker" is that the difficulty of building an environment is low. For the container environment, you can build the desired environment by downloading the "Docker image" from "Docker Hub" and making some changes.
In addition, "Docker" consumes less resources, and a container can be created in no time just by typing the command to create a "Docker container" from the command prompt.
Easy to share and unify environments
If you install "Docker" in each environment, you can run the application simply by downloading the same "Docker image" and creating a container.
This allows developers to easily share and standardize the development environment. Another advantage is that the production environment can be created in the same environment as the environment created in the development process, so the transition to the production environment can be performed smoothly.
Low resource consumption
Compared to traditional virtual environments, container virtual environments consume less resources such as disk and memory. This is because the hosted virtualization and hypervisor types require a guest OS, while the container type does not require a guest OS and the containers only run the applications.
The disadvantages of Docker
Dependence on a single OS limits flexibility
Since Docker containers run using the kernel part of one OS, the flexibility of the OS is limited. For example, in order to run Windows containers and Linux containers on the same machine, it is necessary to prepare a hypervisor-type virtual environment
Higher security risk compared to virtual machines
Docker containers run multiple containers on one OS, so if a third party deprives privileges, all containers will be affected. Assuming that Docker containers pose a higher security risk than virtual machines, it is necessary to take solid security measures.
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