Redis failed to connect: connection refused from Nginx - nginx

Question

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
Update:
Well, I just updated my openresty to latest version and things went back to work

Answer 1

I was having this same issue but figured it out after a bit of help from a Chinese thread from a google group. Essentially we have to add options table with the pool name when connecting. I don't know why, but it worked for me.
Here is my code:
local options_table = {}
options_table["pool"] = "docker_server"
local ok, err = red:connect("10.211.55.8", 6379, options_table)