Mruby nginx redirects with redis

docker-compose.yml

version: '2'
services:
  redis:
    image: redis
  nginx:
    build: .
    command: tail -f /var/log/nginx/access.log
    environment:
      - REDIS_URL=redis
    ports:
      - "3000:3000"
    depends_on:
      - redis

Dockerfile

FROM centos:latest
MAINTAINER Mikl Taraskin <example@gmail.com>
ADD nginx-build-rpm /tmp/nginx-build-rpm
WORKDIR /tmp/nginx-build-rpm
RUN rpm -Uvh nginx-build.rpm
RUN yum install -y redis
RUN mkdir -p /etc/nginx/include.d/rewrites/
ADD example.rb /etc/nginx/include.d/rewrites/example.rb
ADD nginx.conf /etc/nginx/nginx.conf

example.rb

client = Redis.new('redis', 6379, 2) # Connect to the server ENV['REDIS_URL']
client.select 0

r = Nginx::Request.new
Nginx.errlogger Nginx::LOG_ERR, "request uri: #{r.uri}"

if matched_redirect = client.get(r.uri)
  matched_redirect
else
  r.uri
end

nginx.conf

# Work around problem 'no "events" section in configuration'
events {  }

http {
  server {
    listen       3000;

    location / {
      mruby_set $redirect_candidate "/etc/nginx/include.d/rewrites/example.rb";
      if ($redirect_candidate != $request_uri) {
        rewrite ^(.*)$ $redirect_candidate permanent;
      }
      return 200 "hello world";
    }
  }
}

Пара вопросов:

1. Надо подумать как сохранить данные при перезапуске redis контейнера
2. Какое время ответа от контейнера, сколько задержка на mruby + сходить в redis?