What do vps and docker mean?

vps refers to "virtual private server", which is a technology that divides a server into multiple virtual private servers; while docker is an advanced application container engine based on LXC, and the source code is hosted on Github , based on go language and compliant with the Apache2.0 protocol and open source.

The operating environment of this tutorial: linux5.9.8 system, docker-1.13.1 version, Dell G3 computer.

What does vps mean

VPS (Virtual Private Server) splits a server into multiple virtual private servers Technology.

The technologies used to implement VPS are divided into container technology and virtualization technology. In a container or virtual machine, each VPS can be equipped with an independent public IP address and an independent operating system to isolate the disk space, memory, CPU resources, processes and system configurations between different VPSs, simulating a virtual environment for users and applications. The experience of "exclusive" use of computing resources. VPS can reinstall the operating system, install programs, and restart the server independently just like a standalone server. VPS provides users with the freedom to manage configurations and can be used for enterprise virtualization and IDC resource rental.

IDC resource rental, provided by VPS provider. Due to differences in the hardware VPS software used by different VPS providers and different sales strategies, the VPS experience is also quite different. Especially when the VPS provider oversells and causes the physical server to be overloaded, VPS performance will be greatly affected. Relatively speaking, container technology is more efficient in hardware usage than virtual machine technology and is easier to oversell. Therefore, generally speaking, the price of container VPS is higher than the price of virtual machine VPS.

These VPS hosts share hardware, software licenses, and management resources for maximum efficiency. Each VPS host can be equipped with an independent public IP address, independent operating system, independent large space, independent memory, independent CPU resources, independent execution programs and independent system configuration. In addition to assigning multiple virtual hosts and unlimited In addition to corporate mailboxes, it also has independent host functions. You can install programs by yourself and restart or reinstall the host independently (some virtualization/container technologies do not support kernel replacement).

A simple understanding of VPS is a system isolated through virtualization technology

What does docker mean

Docker It is an open source application container engine that allows developers to package their applications and dependency packages into a portable image, and then publish it to any popular Linux or Windows operating system machine, which can also be virtualized. Containers completely use the sandbox mechanism and will not have any interfaces with each other.

Docker is an advanced container engine based on LXC open sourced by PaaS provider dotCloud. The source code is hosted on Github. It is open source based on go language and complies with the Apache2.0 protocol.

What changes will docker bring to server-side development/deployment?

Achieving more lightweight virtualization to facilitate rapid deployment

It can greatly reduce the time cost and labor cost of deployment

Docker It supports packaging applications into a portable container, redefining the process of application development, testing, deployment and online. The core concept is Build once, Run anywhere. A typical application scenario is to provide continuous integration and continuous deployment services on development and operation.

1) Standardized application release, docker container contains running environment and executable program, can be used across platforms and hosts;

2) Save time, rapid deployment and startup, VM The startup time is generally minutes, while the docker container startup time is seconds;

3) It is convenient to build a system based on SOA architecture or microservice architecture, and through service orchestration, better loose coupling;

4 ) Save costs. In the past, a virtual machine required at least several G of disk space, and docker containers can be reduced to MB level;

5) Convenient continuous integration, making continuous integration very convenient by associating it with the code;

6) It can be used as a lightweight host or node in a cluster system. On the IaaS platform, CaaS has appeared, replacing the original host through containers.

Recommended learning: "docker video tutorial"

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