HAproxy crash when reload with systemd
Hi, I use HAproxy on a CentOS 7, shipped with systemd. Whenever I want to reload it with systemctl reload haproxy.service, HAproxy crash every time. I need to restart it with systemctl start haproxy.service Here is the reload command in the systemd unit file: ExecReload=/bin/bash -c exec /usr/sbin/haproxy -D -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid -sf $MAINPID Any ideas why it crashed and how fix it ? Regards Kevin C
Re: HAproxy crash when reload with systemd
Hi Kevin, On 15:51 Wed 23 Jul , Kevin COUSIN wrote: Here is the reload command in the systemd unit file: ExecReload=/bin/bash -c exec /usr/sbin/haproxy -D -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid -sf $MAINPID This command will not work, because it will replace the already running haproxy process and systemd does not really like this. You have to use the dedicated systemd wrapper shipped with haproxy instead. There is also a sample systemd unit file in contrib/systemd in HAProxy's source that you can use as-is or as a reference. Regards, Apollon
Re: Question about graceful restart and SO_REUSEPORT
On Wed, Jul 23, 2014 at 8:22 AM, Vincent Bernat ber...@luffy.cx wrote: Thanks to the work for CRIU, it is now possible to implement TCP handover in userland. After unbinding from listening ports, the old HAProxy could handover the remaining opened connections to the new process. However, this is no easy task since all the internal state needs to be serialized to the new process and unserialized there. See: http://lwn.net/Articles/495304/ Yes, maybe it could work, but using CRIU looks like a complex way to solve the problem of zero downtime restarts :)
Re: Question about graceful restart and SO_REUSEPORT
❦ 23 juillet 2014 16:48 +0200, Nicolas Grilly nico...@vocationcity.com : If I'm correct on the above, then I don't understand why the problem is limited to connections during the 3WHS. Why established connections are not lost? Why are they transferred correctly from the old to the new process? From my understanding, they are not. Maybe the confusion comes from sticky tables being synchronized. But they are here to schedule new connections. -- # Basic IBM dingbats, some of which will never have a purpose clear # to mankind 2.4.0 linux/drivers/char/cp437.uni
Re: Problems When Upgrading HaProxy from 1.4.18 to 1.5.2
Le 23/07/2014 22:07, Tamim Khan a écrit : That settings seems to have fixed our lockup problem. Unfortunately, much like the docs say, since the setting only processes the first request and just tunnels the rest. This prevents us from using option forwardfor which is required by our application. Indeed, and with your configuration, that was already not the case with haproxy 1.4.18, where the X-Forwarded-For header was only added on the first request in the connection. Switching to 1.5.2 has the advantage to fix your configuration transparently. From reading the docs, it seems like keep alives to the backend should be enabled by default in the default mode of http-keep-alive. Is this not the case? If not then what do we need to do in order to enable keep alives on the backend and keep the X-Forwarded-For header? This is the case, but your configuration doesn't stick on a server for successive requests (no cookie, round robin load balancing algorithm used, ...). You may require option prefer-last-server [1] [1] http://cbonte.github.io/haproxy-dconv/configuration-1.5.html#option%20prefer-last-server -- Cyril Bonté
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