Redis failed to connect: connection refused

I'm struggling with this issue more than a week, and still cannot pull it off.
I'm trying to provision our environment using Ansible, and I want to provision a staging server, with the same environment as production, I have setup the Redis server, and it's running listening on 6379 I have nginx up and running and it's serving requests, but when it's got to the part of lua to connect to redis, it throw on me connection refused error.
Here is nginx debug log: Link

Redis Listening on 6379

$ sudo lsof -i -P -n | grep LISTEN | grep 6379
redis-ser  1978         redis    4u  IPv6 138447828      0t0  TCP *:6379 (LISTEN)
redis-ser  1978         redis    5u  IPv4 138447829      0t0  TCP *:6379 (LISTEN)

Connecting to Redis through Python

Python 2.7.12 (default, Oct  8 2019, 14:14:10) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
import redis
redis.Redis(host='127.0.0.1', port=6379, db='0')
r.set("Test", 'value')
True
r.get("Test")
'value'

Lua Code:

local red = redis:new()
red:set_timeout(500)
local ok, err = red:connect("127.0.0.1", 6379)
if not ok then
     ngx.say("Redis failed to connect: ", err)
     return
end

Nginx conf:

server {
    listen 8080;
    server_name xxx.com;
    access_log /var/log/nginx/xxxx_access.log;
    error_log /var/log/nginx/xxxx_error.log debug;

    proxy_redirect     off;
    proxy_set_header Host   $host;
    proxy_set_header REMOTE_ADDR $http_cf_connecting_ip;
    proxy_set_header X-Real-IP  $http_cf_connecting_ip;
    proxy_set_header X-URI  $uri;
    proxy_set_header X-Scheme $scheme;
    proxy_set_header X-Forwarded-Protocol $scheme;

    location / {
        rewrite_by_lua_file '/var/www/xxxx/nginx/add_header_web.lua';
        proxy_pass http://xxxxx/;
    }
}

Environment

Redis 3.2.0
Nginx: openresty/1.7.7.2
configure arguments: --prefix=/usr/local/openresty/nginx --with-debug --with-cc-opt='-I/opt/ngx_openresty-1.7.7.2/build/luajit-root/usr/local/openresty/luajit/include/luajit-2.1 -DNGX_LUA_USE_ASSERT -DNGX_LUA_ABORT_AT_PANIC -O2 -O2' --add-module=../ngx_devel_kit-0.2.19 --add-module=../echo-nginx-module-0.57 --add-module=../xss-nginx-module-0.04 --add-module=../ngx_coolkit-0.2rc2 --add-module=../set-misc-nginx-module-0.28 --add-module=../form-input-nginx-module-0.10 --add-module=../encrypted-session-nginx-module-0.03 --add-module=../srcache-nginx-module-0.28 --add-module=../ngx_lua-0.9.14 --add-module=../ngx_lua_upstream-0.02 --add-module=../headers-more-nginx-module-0.25 --add-module=../array-var-nginx-module-0.03 --add-module=../memc-nginx-module-0.15 --add-module=../redis2-nginx-module-0.11 --add-module=../redis-nginx-module-0.3.7 --add-module=../rds-json-nginx-module-0.13 --add-module=../rds-csv-nginx-module-0.05 --with-ld-opt='-Wl,-rpath,/usr/local/openresty/luajit/lib -L/opt/ngx_openresty-1.7.7.2/build/luajit-root/usr/local/openresty/luajit/lib -Wl,-rpath,/usr/local/lib' --conf-path=/etc/nginx/nginx.conf --with-http_realip_module --with-http_stub_status_module --with-http_geoip_module --with-http_ssl_module --with-http_sub_module --add-module=/opt/nginxmodules/nginx-upload-progress-module --add-module=/opt/nginxmodules/nginx-push-stream-module

Start with the Lua connection call, the nginx configuration, and the linked debug log, then compare the Redis listener details with the runtime environment provisioned by Ansible. Done means identifying why the nginx Lua request receives “connection refused” and documenting a verified working configuration or reproducible failure.