V1.6.10 - Soft reload not working under Centos 7.2

@Arianrhod wrote:

Hi - I have two haproxy servers with identical haproxy.cfg files, one running under Ubuntu 16.04, the other Centos 7.2. I need the option to maintain existing connections while loading a new config file, so choose to use the soft reload option. On the Ubuntu server, I can run /etc/init.d/haproxy reload to 'soft restart' and it works perfectly, but on the Centos server, the same command doesn't work.

Haproxy version is this on both:

HA-Proxy version 1.6.10 2016/11/20
Copyright 2000-2016 Willy Tarreau willy@haproxy.org

Build options :
TARGET = linux2628
CPU = generic
CC = gcc
CFLAGS = -O2 -g -fno-strict-aliasing -Wdeclaration-after-statement
OPTIONS =

Default settings :
maxconn = 2000, bufsize = 16384, maxrewrite = 1024, maxpollevents = 200

Encrypted password support via crypt(3): yes
Built without compression support (neither USE_ZLIB nor USE_SLZ are set)
Compression algorithms supported : identity("identity")
Built without OpenSSL support (USE_OPENSSL not set)
Built without PCRE support (using libc's regex instead)
Built without Lua support
Built with transparent proxy support using: IP_TRANSPARENT IPV6_TRANSPARENT IP_FREEBIND

Available polling systems :
epoll : pref=300, test result OK
poll : pref=200, test result OK
select : pref=150, test result OK
Total: 3 (3 usable), will use epoll.

Error on trying a reload is this:

Feb 7 07:26:31 apl00086i3 haproxy[8092]: Proxy http_frontend started.
Feb 7 07:26:31 apl00086i3 haproxy[8092]: Proxy http_frontend started.
Feb 7 07:26:31 apl00086i3 haproxy[8092]: Proxy sspe started.
Feb 7 07:26:31 apl00086i3 haproxy[8092]: Proxy sspe started.
Feb 7 07:26:31 apl00086i3 haproxy[8092]: Proxy stats started.
Feb 7 07:26:31 apl00086i3 haproxy[8092]: Proxy stats started.
Feb 7 07:26:31 apl00086i3 systemd: Reloaded SYSV: HA-Proxy is a TCP/HTTP reverse proxy which is particularly suited for high availability environments..
Feb 7 07:26:31 apl00086i3 systemd: haproxy.service: main process exited, code=killed, status=9/KILL
Feb 7 07:26:31 apl00086i3 haproxy: Shutting down haproxy: [FAILED]
Feb 7 07:26:31 apl00086i3 systemd: Unit haproxy.service entered failed state.
Feb 7 07:26:31 apl00086i3 systemd: haproxy.service failed.

.. but if I issue /etc/init.d/haproxy start, it starts correctly, even though the previous command had a 'FAILED' state for shutdown:

Feb 7 07:26:41 apl00086i3 systemd: Starting SYSV: HA-Proxy is a TCP/HTTP reverse proxy which is particularly suited for high availability environments....
Feb 7 07:26:41 apl00086i3 haproxy[8122]: Proxy http_frontend started.
Feb 7 07:26:41 apl00086i3 haproxy[8122]: Proxy http_frontend started.
Feb 7 07:26:41 apl00086i3 haproxy[8122]: Proxy sspe started.
Feb 7 07:26:41 apl00086i3 haproxy[8122]: Proxy sspe started.
Feb 7 07:26:41 apl00086i3 haproxy[8122]: Proxy stats started.
Feb 7 07:26:41 apl00086i3 haproxy[8122]: Proxy stats started.
Feb 7 07:26:41 apl00086i3 haproxy: Starting haproxy: [ OK ]
Feb 7 07:26:41 apl00086i3 systemd: Started SYSV: HA-Proxy is a TCP/HTTP reverse proxy which is particularly suited for high availability environments..

Any clues, please, or suggestions how this can be debugged further, since those log entries aren't particularly useful?

thanks ..

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