Installing HAProxy on CentOS 6.3?
Solution 1:
The haproxy package has been removed from EPEL because it is now included with RHEL 6.4 (and will be in derivative distributions after they build 6.4).
Red Hat Enterprise Linux 6.4 introduces the haproxy package as a Technology Preview.
If you need it now, you can obtain Red Hat's 6.4 SRPM and rebuild it on your system (the same way CentOS will shortly). For example:
wget http://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/haproxy-1.4.22-3.el6.src.rpm
mock -r epel-6-x86_64 haproxy-1.4.22-3.el6.src.rpm
Otherwise you can wait for CentOS 6.4 and then it will be available through the base repository.
Solution 2:
HAProxy is not part of the general subscription.
You'll need to add the "RHEL Server Load Balancer (v. 6 for 64-bit x86_64)" channel to your entitlements before you can "yum install haproxy"