How do I enable logging for haproxy load balancer in my RHEL-OSP environment?

Solution Verified - Updated

Environment

  • Red Hat Enterprise Linux OpenStack Platform 6.0
  • Red Hat Enterprise Linux OpenStack Platform 7.0
  • Red Hat OpenStack Platform 8.0

Issue

  • I am running a highly available RHEL-OSP environment deployed by RHEL-OSP-INSTALLER. This uses haproxy to load balance requests to API end points and haproxy seems to drop some connections. How can I enable logging for haproxy to get more details on why this happens?

Resolution

  • Remove notice from the following line in your haproxy.cfg (in older versions of haproxy)
log  127.0.0.1 local3 notice

For haproxy >= 1.5 and for global logging

global
(...)
  log  127.0.0.1 local3

defaults
(...)
   option tcplog

Add the 'option tcplog' for detailed logging information.

Or for a specific service in haproxy >= 1.5

listen horizon
(...)
  option  tcplog
  log 127.0.0.1 local3
(...)

Make sure that option httplog is set to troubleshoot http(s) connections

  • Enable the following lines of /etc/rsyslog.conf :
$ModLoad imudp
$UDPServerRun 514
  • Create a haproxy.conf file under /etc/rsyslog.d/ :
# cat >> /etc/rsyslog.d/haproxy.conf << EOF
local3.* /var/log/haproxy.log
EOF
  • Create the log file :
# touch /var/log/haproxy.log
  • Restart rsyslog and haproxy
# systemctl restart rsyslog
# systemctl restart haproxy
SBR
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