How to: Active-Passive
![active-passive](https://raw.githubusercontent.com/karanpratapsingh/portfolio/master/public/static/courses/system-design/chapter-I/clustering/active-passive.png)

Like the active-active cluster configuration, an active-passive cluster also consists of at least two nodes. However, as the name _active-passive_ implies, not all nodes are going to be active. For example, in the case of two nodes, if the first node is already active, then the second node must be passive or on standby.