Can you explain the concept and main purpose of Docker Swarm?

Docker Swarm is a built-in Docker tool for container orchestration that allows managing a cluster of Docker nodes as a single logical resource. Its main purpose is to automate the deployment, scaling, and management of containerized applications in a distributed environment.

Key features of Docker Swarm:

• Managing multiple Docker daemons as a single cluster.
• Automatic distribution of containers across nodes.
• Load balancing between containers.
• Ensuring high availability through service replication.
• Updating services without downtime (rolling updates).

Thus, Docker Swarm simplifies the operation of containerized applications in production, providing easy scaling and fault tolerance.