openresty redis all in one docker demo

 

一个简单的docker demo 集成openresty+ redis，可以实现基于redis的动态修改反向代理的处理

环境准备

• docker-compose 文件

version: "3"
services:
    nginx-redis:
      build: ./
      image: dalongrong/appdemorong
      tty: true
      ports:
      - "6379:6379"
      - "8099:80"

• dockerfile

FROM openresty/openresty:alpine
RUN apk add --update 
    && apk add redis
ADD entrypoint.sh /entrypoint.sh
COPY redis.conf /redis.conf
COPY nginx.conf usr/local/openresty/nginx/conf/
ENV PATH=$PATH:/usr/bin
EXPOSE 6379
EXPOSE 80
ENTRYPOINT ["sh", "/entrypoint.sh"]

• redis.conf 配置文件
  很简单主要是使用后台任务运行，同时禁用保护模式,添加以下内容就可以了

daemonize yes
protected-mode no 

• nginx.conf
  基于redis 的host 查找，实现动态负载（需要手工修改redis key 信息）

worker_processes 1;
events {
    worker_connections 1024;
}
http {
    include mime.types;
    default_type application/octet-stream;
    sendfile on;
    keepalive_timeout 65;
    gzip on;
    resolver 114.114.114.114;
    real_ip_header X-Forwarded-For;
    real_ip_recursive on;
    server {
        listen 80;
        server_name localhost;
        charset utf-8;
        location / {
           set $subdomain api.yonyou.com;
           access_by_lua_block {
            local redis = require "resty.redis"
            local red = redis:new()
            red:set_timeout(1000)
            local ok, err = red:connect("127.0.0.1", 6379)
            if not ok then
               ngx.say("failed to connect: ", err)
               return
            end
            local host = ngx.var.host;
            local res, err = red:get(host)
            ngx.var.subdomain = res
            }
            proxy_pass http://$subdomain/$uri;
            proxy_set_header Host $subdomain;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }

        location /ip {
            default_type text/html;
            content_by_lua_block{
                ngx.say(ngx.var.remote_addr)
            }
        }
        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
            root html;
        }
    }
}

• entrypoint.sh
  很简单就是启动redis以及openresty

#!/bin/bash
redis-server /redis.conf
exec /usr/local/openresty/bin/openresty -g "daemon off;"

运行&&测试

• 构建&&启动

docker-compose build && docker-compose up -d

• 添加负载均衡配置
  
• 访问效果
  当前是一个jenkins 界面
  
  重新修改为一个git的界面
  
  

说明

demo 很简单，主要是为了运行一个测试环境，但是同时为了方便进行反向代理后端的调整，所以写了一个简单的demo
实际上更好的方式可能是使用supervisor，tini,或者docker 自带的init 功能
tini 参考dockerfile 如下：

FROM openresty/openresty:alpine
ENV TINI_VERSION v0.18.0
RUN apk add --update 
    && apk add redis 
    && apk add --no-cache tini
ADD entrypoint.sh /entrypoint.sh
COPY redis.conf /redis.conf
COPY nginx.conf usr/local/openresty/nginx/conf/
ENV PATH=$PATH:/usr/bin
EXPOSE 6379
EXPOSE 80
ENTRYPOINT ["/sbin/tini","-s", "--", "/entrypoint.sh"]