Redis setup example

To use this script with Redis is very simple / easy.

Spoiler : rewrite_by_lua works with New Nginx Lua versions ONLY

#http block
# you do not need the following line if you are using
# the OpenResty bundle:
# https://github.com/openresty/lua-resty-redis
lua_package_path "./conf/lua/lua-resty-redis/lib/?.lua;;";

lua_shared_dict antiddos 70m; #Anti-DDoS shared memory zone to track requests per each unique user
access_by_lua_file conf/lua/anti_ddos_challenge.lua;

server {

	location /test {

		# need to specify the resolver to resolve the hostname
		resolver 8.8.8.8;

		#open rewrite by lua tag
		# for large configurations use
		#rewrite_by_lua_file custom_settings.lua #you can make your configurations as big as you like without hitting limits
		rewrite_by_lua_block {

			local redis = require "resty.redis"
			local red = redis:new()

			red:set_timeouts(1000, 1000, 1000) -- 1 sec

			--or connect to a unix domain socket file listened
			--by a redis server:
			--local ok, err = red:connect("unix:/path/to/redis.sock")

			-- connect via ip address directly
			local ok, err = red:connect("127.0.0.1", 6379)

			if not ok then
				--ngx.say("failed to connect: ", err)
				return
			end

			if localized_global == nil then --if global not exists
				localized_global = {} --define global var that script can read
			end

			local ok, err = red:set("secret", " enigma")
			if not ok then
				--ngx.say("failed to set secret key: ", err)
				return
			end

			--ngx.say("set result: ", ok)

			local res, err = red:get("secret")
			if not res then
				--ngx.say("failed to get secret: ", err)
				return
			else
				--result found do something
				localized_global.secret = res --nginx will now set secret key via Redis Database
			end

			if res == ngx.null then
				--ngx.say("secret not found.")
				return
			end

			--ngx.say("secret key: ", res)

			-- put it into the connection pool of size 100,
			-- with 10 seconds max idle time
			local ok, err = red:set_keepalive(10000, 100)
			if not ok then
				--ngx.say("failed to set keepalive: ", err)
				return
			end

			--or just close the connection right away:
			--local ok, err = red:close()
			--if not ok then
			--	ngx.say("failed to close: ", err)
			--	return
			--end

		} #end rewrite_by_lua_block

	} #end location block

} #end server block

Spoiler : set_by_lua works with All Old and New Nginx Lua versions

#http block
# you do not need the following line if you are using
# the OpenResty bundle:
# https://github.com/openresty/lua-resty-redis
lua_package_path "./conf/lua/lua-resty-redis/lib/?.lua;;";

lua_shared_dict antiddos 70m; #Anti-DDoS shared memory zone to track requests per each unique user
access_by_lua_file conf/lua/anti_ddos_challenge.lua;

server {

	location /test {

		# need to specify the resolver to resolve the hostname
		resolver 8.8.8.8;

		#open set by lua tag
		# for large configurations use
		#set_by_lua_file $localized_global custom_settings.lua #you can make your configurations as big as you like without hitting limits
		set_by_lua $localized_global '

			local load = load
			local localized_global = [[

			local redis = require "resty.redis"
			local red = redis:new()

			red:set_timeouts(1000, 1000, 1000) -- 1 sec

			--or connect to a unix domain socket file listened
			--by a redis server:
			--local ok, err = red:connect("unix:/path/to/redis.sock")

			-- connect via ip address directly
			local ok, err = red:connect("127.0.0.1", 6379)

			if not ok then
				--ngx.say("failed to connect: ", err)
				return
			end

			if localized_global == nil then --if global not exists
				localized_global = {} --define global var that script can read
			end

			local ok, err = red:set("secret", " enigma")
			if not ok then
				--ngx.say("failed to set secret key: ", err)
				return
			end

			--ngx.say("set result: ", ok)

			local res, err = red:get("secret")
			if not res then
				--ngx.say("failed to get secret: ", err)
				return
			else
				--result found do something
				localized_global.secret = res --nginx will now set secret key via Redis Database
			end

			if res == ngx.null then
				--ngx.say("secret not found.")
				return
			end

			--ngx.say("secret key: ", res)

			-- put it into the connection pool of size 100,
			-- with 10 seconds max idle time
			local ok, err = red:set_keepalive(10000, 100)
			if not ok then
				--ngx.say("failed to set keepalive: ", err)
				return
			end

			--or just close the connection right away:
			--local ok, err = red:close()
			--if not ok then
			--	ngx.say("failed to close: ", err)
			--	return
			--end
			
			]]
			return load(localized_global,"=localized_global_redis1")() --loadstring to run lua code from our set ngx variable

		'; #end set_by_lua tag

	} #end location block

} #end server block

Well done you are on your way to building your very own CDN just like Cloudflare.

How to setup Redis with caching example https://github.com/C0nw0nk/Nginx-Lua-Anti-DDoS/wiki/Redis-Cache-setup-example

You can find more examples on how to Build your own control panel and database here https://github.com/openresty/lua-resty-redis#synopsis