Form a Cluster

Your goal is to bring up the full cluster, wait for all five members to join, and confirm how many have done so. You already stopped the single instance in an earlier lesson, so the host ports that core-1 needs are free.

The cluster is defined in cluster/docker-compose.yml. It declares the five members as services on a shared skyshard network. The three primaries are nearly identical, so here is core-1: