lua-resty-lrucache binary package in Ubuntu Oracular amd64

 The LRU cache resides completely in the Lua VM and is subject to Lua GC.
 As such, do not expect it to get shared across the OS process boundary.
 The upside is that you can cache arbitrary complex Lua values (such as deep
 nested Lua tables) without the overhead of serialization (as with ngx_lua's
 shared dictionary API). The downside is that your cache is always limited to
 the current OS process (i.e. the current Nginx worker process). It does not
 really make much sense to use this library in the context of init_by_lua
 because the cache will not get shared by any of the worker processes (unless
 you just want to "warm up" the cache with predefined items which will
 get inherited by the workers via fork()).

Source package