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Docker is an open platform for developing, shipping, and running applications. Docker is designed to deliver your applications faster. With Docker you can separate your applications from your infrastructure and treat your infrastructure like a managed application. Docker helps you ship code faster, test faster, deploy faster, and shorten the cycle between writing code and running code. Docker does this by combining a lightweight container virtualization platform with workflows and tooling that help you manage and deploy your applications.
At its core, Docker provides a way to run almost any application securely isolated in a container. The isolation and security allow you to run many containers simultaneously on your host. The lightweight nature of containers, which run without the extra load of a hypervisor, means you can get more out of your hardware.
Docker has two major components:
Docker uses a client-server architecture. The Docker client talks to the Docker daemon, which does the heavy lifting of building, running, and distributing the Docker containers. Both the Docker client and the daemon can run on the same system, or you can connect a Docker client to a remote Docker daemon. The Docker client and daemon communicate via sockets or through a RESTful API.
Figure 1 : The Docker architecture
The Docker daemon runs on a host machine. The user does not directly interact with the daemon, but instead through the Docker client.
The Docker client, in the form of the docker binary, is the primary user interface to Docker. It accepts commands from the user and communicates back and forth with a Docker daemon.
To understand Docker’s internals, you need to know about three components:
Due to the lightweight architecture of the docker and fast accessibility of the applications, Docker is gaining a rapid foothold among IT giants. As continuous access to the applications is the key in such environments, even the smallest slip in the performance of the Docker would result in huge losses. To ensure the 24x7 availability of the Docker and high performance rate, administrators need to closely monitor the performance and status of the Docker and its associated components, promptly detect abnormalities, and fix them before end-users notice. This is where eG Enterprise helps administrators.
eG Enterprise provides monitoring support to Docker on Linux platforms only, and not on Windows.