April 2018
Intermediate to advanced
250 pages
5h 42m
English
Content preview from Docker for Serverless Applications
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Docker Swarm clusters
A cluster is a group of machines connecting together to do work. A Docker host is a physical or virtual machine with the Docker Engine installed. We create a Docker Swarm cluster by connecting many Docker hosts together. We refer to each Docker host as a Docker Swarm node, simply a node.
In version 1.12, Docker introduced Swarm mode, a new orchestration engine to replace the old Swarm cluster, which is now referred to as Swarm classic. The main difference between Swarm classic and Swarm mode is that Swarm classic uses an external service, such as Consul, etcd, or Apache ZooKeeper as its key/value store, but Swarm mode has this key/value built in. With this, Swarm mode keeps orchestration latency at a minimum, and is ...
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