FailOver mode - For last configuration
The idea is in some desaster recovery plan we will want to get NGINX/LLNG up before any SGBD/NOSQL serveur. So in some case, the configuration database(mongo in our case) is offline at start of LLNG.
What we suggest, is to keep a local copy of the lastest push config in a File, and if LLNG fail to retrive the config from it's main source, it's fall back to te lastest config file...
Indeed in case of FailOver, no save change are permitted in Manager, and manger will show in read-only the current config or propose to try back the loading config from the main config server. If working, the serveur reload it's configuration and take a normal state.
This feature it's perfect when we use in LLNG overs Fail-Over NGINX to ensure evry could start and configuration is the same on every instance of LLNG