Replicated vs. Global Services In Docker Swarm-FAQ’s

What will happen to global service when a new node is added to cluster ?

On adding a new node to the cluster , it will lead to automatic deploy of an instance on the new node.

What happens on node failure in replication service ?

Docker Swarm will automatically reschedule deploy instances on the available nodes to maintain the desired number of replicas.

Do replication service guarantee to run one replica on each node in a cluster ?

No , replication service does not guarantee of running one replica on each node in a cluster.

How does Docker Swarm handles service discovery in replication and global services ?

Docker Swarm uses built in DNS based service discovery for both replication and global service.

Is there any limitation on number of replicas in replication service ?

No there is no limitation on number of replicas in replication service.

Replicated VS Global Services In Docker Swarm

Docker Swarm is a container orchestration tool used to manage multiple Docker containers across a cluster. In this guide, I will first discuss what Docker Swarm is. Then I will discuss the difference between the key services, which are replicated services and global services. After this, I will walk you through the different steps to perform both replication service and global service in a Docker Swarm.