In old days, under the pressure of budge, we decided to utilize open source HA solution for the production database system.
I struggled to install Linux packages and find the right version dependencies between packages. After writing the configuration files for each layer like corosync, pacemake, and hearbeat, I tested individual layers and then all layers together. This had ran on the production for quite a while.
Nowadays DBaaS is really good to lighten the burden of setup.