What tasks does Docker Swarm solve and in what cases is it used?

Docker Swarm is a built-in Docker tool for container orchestration that allows managing a cluster of Docker nodes and deploying applications as services.

Main tasks of Docker Swarm:

• Cluster management: combining multiple Docker hosts into a single cluster.
• Automatic load distribution: Swarm distributes containers across nodes for balancing.
• Ensuring high availability: in case of node failure, services automatically restart on other nodes.
• Updating services without downtime: support for rolling updates.
• Scaling services: easily increase or decrease the number of replicas.

When to use Docker Swarm:

• If you need simple and quick container orchestration without complex setup.
• For small and medium projects where complex Kubernetes functionality is not required.
• When integration with Docker CLI and Docker Compose is important.

Example of starting a service in Docker Swarm:

docker swarm init

docker service create --name my-web -p 80:80 nginx

Thus, Docker Swarm helps manage containerized applications in a distributed environment with minimal effort.