[systemd-devel] Zero downtime restart of Web application (Nginx, Puma, JRuby)

[David Timothy Strauss]

You either need a load balancer (less elegant) or need to make use of the
Linux kernel's SO_REUSEPORT option so the new application can bind to the
same port as the old one (at which point the old application should unbind
the port and shut itself down).
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