Ceph: Designing and Implementing Scalable Storage Systems

Cluster naming and configuration

The startup configuration file defines values that Ceph components need to start up and find each other. Many Ceph admins think of the file as always being named /etc/ceph/ceph.conf, but other names are possible. The directory /etc/ceph is the default location, but the filename's base is actually the name of a given cluster, which itself defaults to Ceph. Many installations, especially those with a single cluster, leave this defaulted, but custom names are becoming increasingly popular.

Throughout this book, we write in terms of the default cluster name ceph, but let's say we wish our cluster to be known as cephelmerman. Our configuration file will then be found at /etc/ceph/cephelmerman.conf. Most Ceph commands ...