Painless Docker - 2nd Edition

Docker Swarm Global Services

A global service is a service that runs one task on each node in the cluster. This mode is also referred to as the global mode.

Let's say you want to run a logging agent on every node in the cluster to collect logs from all the containers. To achieve this, you need to ensure two things:

• The logging agent should run on all nodes.
• Only one instance of the logging agent should be running on each node.

In the following example, we'll be using Fluentd as the logging agent. To create a global service, run the following command on the manager node and include the --mode global option:

docker service create \