Haproxy hitless reload

https://www.haproxy.com/blog/haproxy-process-management/

echo "show proc" | socat stdio tcp4-connect:192.168.48.2:1234
echo "reload" | socat stdio tcp4-connect:192.168.48.2:1234

https://www.haproxy.com/blog/get-to-know-the-haproxy-process-manager/

nbproc to 3
haproxy_1  | [ALERT]    (7) : config : parsing [/usr/local/etc/haproxy/haproxy.cfg:10] : nbproc is not supported any more since HAProxy 2.5. Threads will automatically be used on multi-processor machines if available.

More

https://www.haproxy.com/documentation/hapee/latest/api/runtime-api/overview/

https://www.haproxy.com/blog/haproxy-process-management/

https://github.com/snorwin/haproxy-reload-wrapper/blob/main/main.go

https://stackoverflow.com/questions/52725226/docker-compose-entrypoint-using-command-exit-code-as-a-failure-detection-mechani

https://cdn.haproxy.com/wp-content/uploads/2020/04/20.-Master-CLI_Configuration.png

https://www.haproxy.com/blog/truly-seamless-reloads-with-haproxy-no-more-hacks/

https://www.haproxy.org/download/2.6/doc/configuration.txt