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This article mainly introduces "what is the role of docker cluster". In daily operation, I believe many people have doubts about what is the role of docker cluster. Xiaobian consulted all kinds of materials and sorted out simple and easy operation methods. I hope to help you answer the doubts of "what is the role of docker cluster"! Next, please follow the small series to learn together!

What is Docker Cluster for? A cluster is a group of multiple machines running docker and joining a group. After joining the cluster, you can continue to run your own docker commands, but now these machines are executed by the cluster manager on the cluster.

For large companies, docker clusters have many advantages, including scalability, rolling upgrades, and fast deployment.

Docker containers can package your programs in linux systems and isolate your programs from other programs. It's equivalent to installing software in a virtual machine that has no connection with the software on the computer, but the biggest difference between it and the virtual machine is that it has a very small performance overhead.

The machines in a cluster can be physical or virtual, and after joining the cluster, each machine is called a node. Cluster managers can use different policies to manage running containers, such as emptiest node, which populates containers with the least utilized, and global, which ensures that each machine gets only one instance of a given Kubernetes Engine.

You can enforce the policies of the cluster manager by writing these policies to a file.

Cluster manager is the only machine in the cluster that can execute commands. You can also delegate other machines to participate in cluster management. Workers are just there to provide capacity, and cannot tell other machines to do or not do anything.

When docker turns on cluster mode, your machine becomes a cluster manager, and docker runs commands that manage clusters, not just on your current machine.

At this point, the study of "what is the role of docker clusters" is over, hoping to solve everyone's doubts. Theory and practice can better match to help everyone learn, go and try it! If you want to continue learning more relevant knowledge, please continue to pay attention to the website, Xiaobian will continue to strive to bring more practical articles for everyone!

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