Docker Swarm

Docker Swarm is a container orchestration tool from Docker and it is Docker’s answer to K8s. It is a set of machines, can be either physical or virtual, configured and joined together to form a cluster thereby enabling the user to manage single or multiple containers deployed across a number machines in the cluster. Docker swarm enables faster deployments and can be scaled up or down on demand.

When deploying multiple containers in a single go, YAML files are used, for example when deploying a LAMP stack where we need to run Apache, MySQL, PHP all in Linux environment this can be achieved by using YAML file then Docker compose deploys the stack.

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Working with Docker Swarm

Docker Swarm is achieved by configured and joining a group of machines either physical or virtual. A machine can join in the swarm as either a Manager Node or as a Worker Node. There can be multiple Manager nodes and Worker Nodes in a swarm. The swarm is effective until at least there is one Manager node left running in the swarm. A worker node can be promoted to a Manager node likewise a Manager node can be demoted to Worker node in a swarm. By default, a Manager node functions as both a Manager node as well as a Worker node.