If we use both a sonic container and a scheduler container, do we need to specify SEARCH_BACKEND_ENGINE from both the main and the scheduler containers?

[melyux]

Or is just setting in the main container's ENV variables enough?

[pirate]

You need to specify it on both if you're using env vars, however an easier way is to set the config value persistently for all instances using archivebox config --set KEY="VALUE" (which is equivalent to adding a line in ArchiveBox.conf).