August 2017
Intermediate to advanced
332 pages
9h 16m
English
Content preview from Continuous Delivery with Docker and Jenkins
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Rolling updates
Imagine you deploy a new version of your application. You need to update all replicas in the cluster. One option would be to stop the whole Docker Swarm service and to run a new one from the updated Docker image. Such approach, however, causes downtime between the moment when the service is stopped and the moment when the new one is started. In the Continuous Delivery process, downtime is not acceptable, since the deployment can take place after every source code change, which is simply often. Then, how can we provide zero-downtime deployment in a cluster? This is the role of rolling updates.
A rolling update is an automatic method for replacing a service, replica by a replica, in a way that some of the replicas are working ...
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