HAProxy: Give me some logs on CentOS 6.5!

HAProxy is frequently used as a load-balancer in front of a Galera cluster. While diagnosing an issue with HAProxy configuration, I realized that logging doesn’t work out of the box on CentOS 6.5. Here is a simple recipe to fix the issue.

If you look at the top of /etc/haproxy/haproxy.cfg, you will see something like:

    log local2

This means that HAProxy will send its messages to rsyslog on But by default, rsyslog doesn’t listen on any address, hence the issue.

Let’s edit /etc/rsyslog.conf and uncomment these lines:

$ModLoad imudp
$UDPServerRun 514

This will make rsyslog listen on UDP port 514 for all IP addresses. Optionally you can limit to by adding:


Now create a /etc/rsyslog.d/haproxy.conf file containing:

local2.*    /var/log/haproxy.log

You can of course be more specific and create separate log files according to the level of messages:

local2.=info     /var/log/haproxy-info.log
local2.notice    /var/log/haproxy-allbutinfo.log

Then restart rsyslog and see that log files are created:

# service rsyslog restart
Shutting down system logger:                               [  OK  ]
Starting system logger:                                    [  OK  ]
# ls -l /var/log | grep haproxy
-rw-------. 1 root   root      131  3 oct.  10:43 haproxy-allbutinfo.log
-rw-------. 1 root   root      106  3 oct.  10:42 haproxy-info.log

Now you can start your debugging session!

The post HAProxy: Give me some logs on CentOS 6.5! appeared first on MySQL Performance Blog.

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