If you looked at the description of the
glideinWMS, you probably guessed that installing a glideinWMS is
a multi-step process.
While the documents presented here assume you will install each component on a different machine, there is nothing preventing you from installing all of them on fewer machines, or even on one machine only (excluding GCB, but you should not use it anyhow).
However, it is recommended that the glidein WMS Collector and collocated glidein Factory node stay on their own node.
The minimum recommended configuration would thus be composed of 2 nodes:
If you want to scale above a few 1000 glideins, it is recommended that you keep the scheduler for user submissions on a dedicated node: