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What exactly is the relationship between container and DevOps? If you can't understand it, you can think of them as "a pair of good partners", indistinguishable from each other.

The reason why container application has developed into a kind of ecology is closely related to the rapid growth of DevOps practice. When containers and DevOps begin to go hand in hand, and when more and more container applications begin to be put into production environment, we also have a deeper and deeper understanding of what is DevOps and what are the ways and methods to implement DevOps.

Containers, more like "pipeline" applications, can directly package the relevant program code, function libraries, and environment configuration files needed by an application to establish an sandboxie execution environment. From the internal structure, strong isolation, high portability, low resource consumption, operators can not consider the host node, cluster and underlying infrastructure and other issues. However, from the perspective of external applications, the programs in the container are the most important part of the overall ecosystem, including: web API, user interface, database, workflow, cache and garbage collector. The technical team sets rules for containers to limit the performance impact of containers on infrastructure. In addition, evaluate the performance of the container itself. Because overloaded workloads may have a negative impact on business units.

The concept of DevOps teaches container development a deep lesson. For developers, whether it is code release or infrastructure construction, each process follows a linear path from concept to implementation. From development to testing to online release, there is no problem in theory, but if a team is stuck in a bottleneck because of a task, then the whole process will be affected.

There are two important methods for DevOps:

First, solve the process problem first. Through technical means to achieve collaborative work, to achieve continuous process management; through the predictability of process management, constantly find and adjust problem points, and then improve work efficiency.

Second, adhere to the principle of feedback. Feedback is to get relevant information quickly. With immediate and useful feedback, many problems can be identified before they occur and resolved before the entire development process is affected. The DevOps team not only focuses on "upstream management", but also focuses on "optimizing downstream", focusing on solving problem points that may affect subsequent teams. Like process management, feedback is an ongoing process, finding ways to quickly access important data and taking action when problems arise. In the process of technology development, the ability to create a fast feedback mechanism determines the late quality realization, and timely feedback is as important as product reliability and safety.

The same is true for container applications, which also establish feedback value. In addition to preventing problems with the container itself, it is also necessary to establish a monitoring mechanism through many monitoring products to understand the dynamics of the container in real time. For example, prometheus is the most popular monitoring alarm tool, which can actively collect data metrics and check whether alarm rules are triggered.

Containers provide a separate, isolated environment for each application running on the server, allowing you to build containers for virtual machines in an instant without having to rely on the operating system. However, this convenience is sometimes at the expense of opaque information, so a quick feedback mechanism must be established to solve the problem quickly.

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