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Docker Swarm mode

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description Docker Swarm mode Overview

Docker Swarm mode is a container orchestration tool built into the Docker Engine that allows users to create and manage a cluster of Docker hosts as a single virtual system for deploying and scaling applications.

help Docker Swarm mode FAQ

How do I create the first manager in Docker Swarm mode?

Run `docker swarm init` on the host you want to use as the manager, then run the generated `docker swarm join` command on worker nodes. Swarm mode is built into Docker Engine. [Docker Swarm docs](https://docs.docker.com/engine/swarm/)

How does Docker Swarm scale a web service across several hosts?

You define a service and its desired replica count, such as three replicas, and Swarm schedules the containers as tasks across available nodes. Overlay networking and Swarm's internal load balancing let those service tasks communicate across the cluster. [Docker service docs](https://docs.docker.com/engine/swarm/how-swarm-mode-works/services/)

Can Docker Swarm apply a rolling update and roll back if the release fails?

Yes, a Swarm service can use a rolling update policy that replaces tasks incrementally instead of stopping every replica at once. The manager can roll the service back to its previous version if the update goes wrong. [Docker Swarm docs](https://docs.docker.com/engine/swarm/)

Are manager and worker connections encrypted in Docker Swarm mode?

Yes, Swarm nodes use mutual TLS authentication and encrypted communication by default. Docker also allows a custom root certificate authority when an organisation needs its own trust chain. [Docker Swarm security](https://docs.docker.com/engine/swarm/)

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