Haproxy hitless reload
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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
2.5 multithreading via nbthread
-https://www.haproxy.com/documentation/hapee/latest/management/multi-threading/
Older
https://www.haproxy.com/blog/get-to-know-the-haproxy-process-manager/ https://www.haproxy.com/blog/multithreading-in-haproxy/
global nbproc 1 # 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. nbthread 6 cpu-map auto:1/1-4 0-3
Show threads with -T option
ps -aux
ps -T -p 9
# ps -aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.2 0.0 2420 596 ? Ss 16:51 0:00 /bin/sh -c /usr/local/sbin/haproxy -S 0.0.0.0:1234 -W -db -f /usr/local/etc/haproxy/haproxy.cfg
root 7 0.3 0.0 89244 10500 ? S 16:51 0:00 /usr/local/sbin/haproxy -S 0.0.0.0:1234 -W -db -f /usr/local/etc/haproxy/haproxy.cfg
root 9 0.5 0.1 483484 39624 ? Sl 16:51 0:00 /usr/local/sbin/haproxy -S 0.0.0.0:1234 -W -db -f /usr/local/etc/haproxy/haproxy.cfg
root 16 0.1 0.0 2420 584 pts/0 Ss 16:51 0:00 sh
root 22 0.0 0.0 6700 2900 pts/0 R+ 16:51 0:00 ps -aux
# ps -T -p 9
PID SPID TTY TIME CMD
9 9 ? 00:00:00 haproxy
9 10 ? 00:00:00 haproxy
9 11 ? 00:00:00 haproxy
9 12 ? 00:00:00 haproxy
9 13 ? 00:00:00 haproxy
9 14 ? 00:00:00 haproxy
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://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/