Swarm tasks and stacks
Swarm Tasks
Swarm Tasks are the atomic unit of scheduling in a Swarm. In simpler terms, a Task is a container and the commands that are running it and it’s a small schedule unit in Swarm. Swarm manager nodes will assign a task to a Worker node and the worker nodes will run it and report on its status. A Task progresses sequentially through a series of states these are assigned, prepared, running, etc.
Example of a task:
docker service create -name redis -replicas=3 redis:3.0.6
We will learn more about tasks in the tutorial section of this article.
Swarm Stacks
Swarm Stacks is used to define a number of services that make up complete application in a specific environment and is a convenient way to automatically deploy multiple services that are linked to each other, without needing to define each one separately.
Swarm Stack is used to build more complex objects. For example, a stack can include a few replicas of nginx and an instance of mysql and it’s all assembled in a docker compose file. It is a similar to the concept of ‘yaml’ file in Kubernetes that could include multiple deployments and other resources and objects that the application might need.
Docker Swarm: Building a Highly Scalable Cluster
Docker Swarm is one of the most popular container orchestration engines. It is not only used by professional engineers but also by people is their learning phase of how operations work. What makes Docker Swarm so popular is the fact that is very lightweight and very simple to understand – you don’t even have to learn a new CLI for Docker Swarm, we can use it with Docker CLI.
In this article, we will learn about Docker Swarm, its features, and use cases and will also go through a tutorial to create highly scalable clusters in Docker Swarm.
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