Home > Storage > ObjectScale and ECS > Product Documentation > Dell ECS with NGINX (OpenResty) > High availability example
The ECS with single OpenResty example in the previous section can be extended to add a second OpenResty to create a redundant OpenResty setup. In this example, another virtual machine (10.246.150.209) with Ubuntu 16.04 LTS operating system and OpenResty was configured the same way as previous example. The “keepalived” utility was installed on both OpenResty servers to do health checks between the two. The redundant OpenResty servers were configured in an active/passive mode. A virtual IP initially maps to the primary OpenResty server and if the primary server fails, then the virtual IP redirects to the IP of the secondary OpenResty server until the primary comes up again. Figure 55 illustrates the setup for the redundant OpenResty load balancers environment described in this example.