Perlbal does manage the health of the web server (which doesn't seem to be
the case for nginx, unfortunately). But perlbal doesn't support HTTPS.

Here is a simple perbal.conf file and it nodelist.dat (which you would need
to rewrite in case of new app node)

*perlbal.conf*
#
# This is an example webserver configuration.
#
# See doc/config-guide.txt for descriptions of each command (line)
# and configuration syntax.
#

CREATE POOL dynamic
  SET nodefile = /etc/perlbal/nodelist.dat

CREATE SERVICE balancer
  SET listen           = 0.0.0.0:80
  SET role             = reverse_proxy
  SET pool             = dynamic
  SET persist_client  = on
  SET persist_backend = on
  SET verify_backend  = on
  SET enable_error_retries = on
ENABLE balancer

# always good to keep an internal management port open:
CREATE SERVICE mgmt
  SET role   = management
  SET listen = 0.0.0.0:60000
ENABLE mgmt

*nodelist.dat* (the IP is the internal IP of your node, of course
# node1
xx.xx.xx.xx.:port
# node2
xx.xx.xx.xx:port

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