Background
etcd is a key-value database with consistency and high availability. It is simple, safe, fast, and reliable and the primary data store for Kubernetes. Let’s start with an official description of etcd’s name.
he name “etcd” originated from two ideas, the unix “/etc” folder and “d”istributed systems. The “/etc” folder is a place to store configuration data for a single system whereas etcd stores configuration information for large scale distributed systems. Hence, a “d”istributed “/etc” is “etcd”.
The above quote comes from etcd officialwebsite. etcd imaginatively combines the concepts of etc (where Linux systems typically store their configuration files) and distributed.** However, since etcd is served via HTTP API, so “unfortunately” a truly distributed /etc directory was not implemented. Below we will introduce how etcd can be used to implement a truly distributed /etc directory via JuiceFS.**
We use JuiceFS, an open…