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2025-01-19 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Servers >
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Today, I will talk to you about how Docker components work together, many people may not know much about it. In order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.
Remember the first container we ran? Now use it to experience how the various components of Docker work together.
The container startup process is as follows:
The Docker client executes docker run commands.
Docker daemon found that there is no httpd image locally.
Daemon downloads the image from Docker Hub.
The download is complete and the image httpd is saved locally.
Docker daemon starts the container.
Docker images can see that httpd has been downloaded locally.
Docker ps or docker container ls shows that the container is running.
Docker draws on the concept of container. Standard containers carry goods around the world, and Docker applies this model to his design philosophy, with the only difference: containers transport goods, while Docker transport software.
Each container has a software image, equivalent to the goods in the container. Containers can be created, started, closed, and destroyed. Like containers, Docker does not care what is in the container when performing these operations, whether it is Web Server or Database.
Users do not need to care about where the container will eventually run, because it can be run anywhere.
Developers can build an image on a laptop and upload it to Registry, then QA personnel download the image to a physical or virtual machine for testing, and eventually the container is deployed to a production environment.
Using Docker and container technology, we can quickly build an application server, a message middleware, a database, and a continuous integration environment. Because there are almost all the images we can think of on Docker Hub.
I don't know if you realize that Pandora's box has been opened. Containers not only lower the threshold for us to learn new technologies, but also improve our efficiency.
If you are an operation and maintenance staff, if you want to study the load balancer software HAProxy, you only need to execute docker run haproxy, without tedious manual installation and configuration, you can directly enter the actual combat.
If you are an open person, you want to learn how to develop Python Web applications with django, execute docker run django, and mess around in the container without worrying about messing up the Host environment.
After reading the above, do you have any further understanding of how Docker components work together? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.
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