Let’s start a simple service by executing the following on the manager node, node-01 - remember to execute eval $(docker-machine env node-01) to point your local Docker client at the Docker daemon running on node-01, first: We’ll talk some more about these topics in a moment, but first, let’s remind ourselves of how to execute a simple update. In addition to the configurable aspects of a service, the manner in which the services are updated is also highly configurable. It provides a bewildering array of config options, which allows a user to update just about every configurable aspect of a service. The Docker CLI command for updating services is the docker service update command. In fact, we did just this in the last tutorial in this series, when we removed a scheduling constraint. Updating a service deployed on a Swarm Mode cluster can be relatively straightforward. All commands are executed against the manager node, node-01, unless explicitly stated otherwise. The most straightforward configuration can be achieved by following the first tutorial. a direct, command-line access to each node, or, access to a local Docker client configured to communicate with the Docker Engine on each node.a single manager node ( node-01), with three worker nodes ( node-02, node-03, node-04), and.a four-node Swarm Mode cluster, as detailed in the first tutorial of this series,.In order to follow the tutorial, the following items are required: This tutorial explores how services can be updated in-flight, and how these updates can be configured to adhere to a predefined policy. Things change, and there needs to be a mechanism for updating services, after they’ve initially been deployed. Deploying services, however, is not necessarily a one-time activity. In this series of tutorials, we’ve seen how to establish a Docker Swarm cluster, schedule services to the cluster’s nodes, and make those services consumable from within and outside the cluster.
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