Some parts of the content come from https://hostedtalk.net/t/connecting-uptime-robot-with-ns1-dns-api/3883 。 Goal I have quite a few VPSes around the world, but my website had been served by a single VPS in Los Angeles for a long time. Because I purchase VPSes from small providers for their specific routing configuration or low price, the network of this VPS can be unstable from time to time. Although it's rare, I had to manually point the DNS to another VPS in case of an outage and switch back after it's back up. Therefore, I want to serve my website with all my VPSes, and automatically reroute traffic to other VPSes if one VPS is down. Synchronizing website data is of no difficulty since I use Hexo, a static site generator....