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CoreOS Essentials by Rimantas Mocevicius

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Use cases of etcd

Application containers running on worker nodes with etcd in proxy mode can read and write to an etcd cluster.

Very common etcd use cases are as follows: storing database connection settings, cache settings, and shared settings. For example, the Vulcand proxy server (http://vulcanproxy.com/) uses etcd to store web host connection details, and it becomes available for all cluster-connected worker machines. Another example could be to store a database password for MySQL and retrieve it when running an application container.

We will cover more details about cluster setup, central services, and worker role machines in the upcoming chapters.

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