What is docker?
Docker is an open source application container engine, based on the Go language and open source in compliance with the Apache2.0 protocol.
Docker allows developers to package their applications and dependencies into a lightweight, portable container, and then publish it to any popular Linux machine, which can also be virtualized.
Containers completely use the sandbox mechanism and do not have any interfaces with each other (similar to iPhone apps). More importantly, the container performance overhead is extremely low.
Docker application scenarios
Automated packaging and publishing of Web applications.
Automated testing, continuous integration and release.
Deploy and adjust databases or other back-end applications in service-based environments.
Compile from scratch or extend an existing OpenShift or Cloud Foundry platform to build your own PaaS environment.
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