docker中如何通过nginx+confd动态生成配置

当我们项目越来越多时手动去服务器修改nginx配置是一件很麻烦而且可能出错的事情。我们可以通过nginx+confd+配置中心实现一套方案避免出错并减少繁琐的流程。

首先直接上nginx+confd的dockerfile

FROM nginx:1.21.6
# 拷贝confd二进制可执行文件 https://github.com/kelseyhightower/confd/releases/tag/v0.16.0
COPY ./confd-0.16.0-linux-amd64 /usr/local/bin/confd
# 拷贝wait-for脚本 https://github.com/Eficode/wait-for
COPY ./wait-for /
# 安装nc支持wait-for脚本
RUN apt-get update \
  && DEBIAN_FRONTEND=noninteractive apt-get install -y \
    net-tools \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/*
RUN apt-get update \
  && DEBIAN_FRONTEND=noninteractive apt-get install -y \
    netcat \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/*
# 创建配置文件目录
RUN mkdir -p /etc/confd/conf.d \
# 给可执行权限
&& chmod +x /usr/local/bin/confd \
&& chmod 777 /wait-for \
# 使用脚本启动多进程
&& echo "#!/bin/bash" >> start.sh \
&& echo "nohup /usr/local/bin/confd -config-file /etc/confd/conf/confd.toml &" >> start.sh \
&& echo "nginx -g 'daemon off;'" >> start.sh \
&& chmod 664 ./start.sh 
CMD ["bash", "start.sh"]

如果不想自己生成可以用:

https://hub.docker.com/repository/docker/lablelan/nginx-confd

这里使用docker-compose来演示如何使用nginx+confd+etcd+etcdkeeper通过图形化修改nginx配置

version: '2'
networks:
  app-tier:
    driver: bridge
    ipam:
      driver: default
      config:
        - subnet: 172.22.0.0/16
services:
  Etcd:
    image: 'bitnami/etcd:3.5.2'
    environment:
      - ALLOW_NONE_AUTHENTICATION=yes
      - ETCD_ADVERTISE_CLIENT_URLS=http://etcd:2379
    ports:
      - 2379:2379
      - 2380:2380
    networks:
      app-tier:
        ipv4_address: 172.22.0.2
  EtcdKeeper:
    image: 'deltaprojects/etcdkeeper:latest'
      - 8000:8080
        ipv4_address: 172.22.0.3
  Nginx:
    image: 'lablelan/nginx-confd'
    command: sh -c '/wait-for Etcd:2379 -- bash start.sh'
    depends_on: 
      - Etcd
    volumes:
      - "./confd.toml:/etc/confd/conf/confd.toml"
      - "./nginx.tmpl:/etc/confd/templates/nginx.tmpl"
      - "./myapp-nginx.toml:/etc/confd/conf.d/myapp-nginx.toml"
      - "./nginx.conf:/etc/nginx/nginx.conf"
      - "./conf.d:/etc/nginx/conf.d"
      - 80:80
        ipv4_address: 172.22.0.4

启动后当通过etcdkeeper创建或更新/myapp/services/web/www/1会动态生成nginx配置(80端口转发8080端口)并自动生效。这里ip配置的是内网ip不使用127.0.0.1，因为服务并不跑在nginx容器上(注意www.lablelan.com我本地hosts设置成了127.0.0.1)