Setup for Thalia clustering
Additional Configuration Steps to prepate a Thalia server for Clustering.
1. create subdomain for *.thalia.mit.edu and also subdomain for all the servers that hosts the thalia web app. We only need one subdomain per cluster.
2. Create new Thalia certificate for the cluster, using the wildcard name of
the cluster, ie *.thalia.mit.edu. Do this only once per
cluster.
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