[tjkrusinski]

Less work. You'd need to have a different context for environment variables that adds another level of complexity. Likewise if you had a dependency that needs updating (SSL, etc), you can do it safely on the idle machine without worrying about production traffic.

[xani_]

Eh, it's pretty trivial to do. The reason for 2 servers is high availability, not that it is easier in meaningful way.

I run something similar on personal site and it's literally just 2 identical configs but with different port/directory and some haproxy config.