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Re:How Stack Overflow upgraded from Windows Server 2012 by timrichard on Tuesday July 23, 2019 @05:31AM (#20505484)
IIRC from previous articles, HAProxy and Redis are key components too.
Re:How Stack Overflow upgraded from Windows Server 2012 by p_l on Sunday July 28, 2019 @01:22PM (#20548685)
running on linux servers, too. (as well as the ELK stack, which handles logging)