Do you know why Docker Swarm is becoming popular, if not then I will answer your this question and also inform you about  its working process.

What is Docker Swarm?

Docker Swarm is a cluster of one or more computers running the docker application. It is also acting as scheduling tool for Docker containers. It comes into play when container is running in service mode.

What the service is?

A service is a description of task or the state, it is not the actual task that needs to be done. Only because of this it is possible to assign it to another node.

How it is working?

The working of Swarm is based on nodes. There are two types of nodes:

1. Manager node: Maintains cluster management tasks
2. Worker node: Receives and executes tasks given by manager node.

In Swarm, containers are executed using services not tasks. 

• In Swarm, every worker node has an agent that reports the state of node's task to manager node. 
• When manager node receives any request for any task  it sends that request to any particular node by understanding the state of all nodes. In case if any node fails then it redirects that task to another node and completes the work.
  

The working process of Docker Swarm is also one reason of its popularity.

Features of Docker Swarm:

• Decentralized access : In Swarm the whole work is in the hands of manager node so it is easy for teams to access and manage the environment.

• High Security: Any communication between manager node and client node is highly secure.

• High Scalability: It is possible to increase its scalability by just adding new nodes.

• Roll-back: It is also a great feature, that it allows us to roll-back environment to previous safe environment .

After explaining its working process and special features like high scalability, security, central access and roll-back, I have reached to this conclusion that it is very powerful tool which is making our work easy and quick.

If you still have any doubt then you can write your question in comment section and I will reach you as soon as possible.