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This article mainly explains "what are the advantages of docker swarm cluster". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what are the advantages of docker swarm cluster".

Swarm is a cluster management tool provided by Docker officially. Its main function is to abstract several Docker hosts as a whole and manage all kinds of Docker resources on these Docker hosts through an entry.

After all, the role that a single docker container can play is limited and not easy to manage, so Docker has to be used in groups and clusters to give full play to its strong technical advantages. Swarm is a subproject of Docker, and it functions at the cluster level just like Docker does in a single machine. You can use Swarm to manage a single container or list all the containers running in the cluster.

Docker Swarm includes two aspects: an enterprise-class Docker security cluster and a micro-service application orchestration engine.

In terms of cluster

Swarm organizes one or more Docker nodes so that users can manage them in a cluster manner. Swarm comes with encrypted distributed cluster storage, encrypted network, public TLS (Mutual TLS), secure cluster access tokens and a set of PKI to simplify digital certificate management by default. We are free to add or remove nodes.

Arrangement aspect

Swarm provides a rich set of API that makes it easy to deploy and manage complex micro-service applications. By defining the application in a declarative configuration file, deployment can be done using native Docker commands. In addition, rolling upgrade, rollback and scaling operations can even be performed, which can also be done based on simple commands.

From a cluster perspective, a Swarm consists of one or more Docker nodes. These nodes can be physical servers, virtual machines, Raspberry Pi, or cloud instances. The only premise is that all nodes are required to be connected through a reliable network. The node is configured as a management node or a work node. The management node is responsible for the control plane of the cluster and carries out operations such as monitoring the status of the cluster and distributing tasks to the work node. The work node receives the task from the management node and executes it.

The configuration and status information of Swarm is stored in a distributed etcd database located on all management nodes. The database runs in memory and keeps the data up to date. The best thing about the database is that it requires almost no configuration, is installed as part of Swarm and requires no administration.

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