Tag Archives: linux

Redundant Load Balancers – HAProxy and Keepalived

In this article, we’ll build a pair of HAProxy load balancers running on Ubuntu 14.04 LTS, and use keepalived to provide failover of our virtual IP address(es).  This article is part of our series on building a highly available OpenStack controller stack, but it can also be used on its own.  We’ll install the services… Read More »

Rethinking Your Choice of Hypervisor

In a few short years it seems like most enterprises have transitioned to virtual infrastructure in a pretty big way.  How many of your servers are VMs now, 50%?  70%?  The key enabling technology in this transition has clearly been VMware vSphere.  They have been the market leaders up to this point in terms of… Read More »

OpenStack – I need how many NICs?

I’m currently working on an OpenStack deployment.  Looking at the documentation and the various deployment scenarios, each host appears to require at least two if not three or four network interface cards, depending on the OpenStack services running on that particular host.  For me, and I suspect for a lot of enterprises, this just isn’t… Read More »