@lorelore75
You can install it while running, though it might cause a interruption regarding the handling of requests, and do check the new version is running after installing. Haproxy-devel replaces haproxy, and uses the same configuration settings so 'upgrade' should be pretty much seamless. Going back to 'haproxy' package should also be possible but sometimes 'upgraded' settings don't take effect in the older version.. So careful a quick comparison of the expected haproxy.cfg is wise to do :), but i guess thats also true when performing upgrades :)