Docker Swarm: An Introduction to Docker Orchestration

Docker Swarm is a native clustering and orchestration tool for Docker. This article introduces Docker Swarm and its basic usage.

Initializing a Swarm

Initialize a new swarm:

docker swarm init

Adding Nodes to the Swarm

To add a worker node to the swarm, run the following command on the worker node:

docker swarm join --token SWMTKN-1-...<manager-ip>:2377

Deploying a Service

Deploy a service to the swarm:

docker service create --name my_service -p 80:80 nginx

Managing Services

List the services running on the swarm:

docker service ls

Scale the service to 3 replicas:

docker service scale my_service=3

Conclusion

Docker Swarm provides an easy way to manage and orchestrate Docker containers across multiple hosts, ensuring high availability and scalability.