Kubernetes Cookbook - Second Edition

Clustering etcd 

etcd stores network information and states in Kubernetes. Any data loss could be crucial. Clustering etcd is strongly recommended in a production environment. etcd comes with support for clustering; a cluster of N members can tolerate up to (N-1)/2 failures. Typically, there are three mechanisms for creating an etcd cluster. They are as follows:

• Static
• etcd discovery
• DNS discovery

Static is a simple way to bootstrap an etcd cluster if we have all etcd members provisioned before starting. However, it's more common if we use an existing etcd cluster to bootstrap a new member. Then, the discovery method comes into play. The discovery service uses an existing cluster to bootstrap itself. It allows a new member in an etcd cluster ...