Docker - Nginx 自动重新加载配置文件更改

Question

我有一个 nginx 容器，带有以下 Dockerfile:

FROM nginx:1.19.2

COPY ./nginx.conf /etc/nginx/nginx.conf
COPY ./conf.d /etc/nginx/conf.d

WORKDIR /etc/nginx/conf.d

RUN ln -s /etc/nginx/conf.d/my-site/my-domain.generic.conf \
  && ln -s /etc/nginx/conf.d/my-site/my-domain.conf

COPY ./certs/* /etc/ssl/

我有以下 docker-compose 文件:

version: '3.5'

services:
  my-site_nginx:
    container_name: my-site_nginx
    build:
      context: ./nginx
      network: host
    image: my-site_nginx
    ports:
      - '80:80'
      - '443:443' # SSL
    volumes:
      - ./nginx/conf.d:/etc/nginx/conf.d:ro

当我更改 conf.d 文件夹中的任何内容时，我正在寻找一种方法让容器内的 nginx 服务自动重新加载(nginx -s reload)以及与 conf.d 文件夹位于同一级别的 nginx.conf 文件。

我发现的最接近的是这里的教程:https://cyral.com/blog/how-to-auto-reload-nginx/但是我不得不稍微调整一下路径，我不知道 openresty 是什么，我想它是自定义图像还是什么？ (这里是 Docker noob)...无论如何，我已经从该链接尝试了以下内容:

创建了 docker-entrypoint.sh 和 nginxReloader.sh 文件:

docker 入口点.sh:

#!/bin/bash
###########

sh -c "nginxReloader.sh &"
exec "$@"

nginxReloader.sh:

#!/bin/bash
###########

while true
do
  inotifywait --exclude .swp -e create -e modify -e delete -e move /etc/nginx/conf.d
  nginx -t
  if [ $? -eq 0 ]
  then
    echo "Detected Nginx Configuration Change"
    echo "Executing: nginx -s reload"
    nginx -s reload
  fi
done

并将其添加到 Dockerfile 中:

# [...]

COPY ./nginxReloader.sh /usr/local/bin/nginxReloader.sh
COPY ./docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
RUN chmod +x /usr/local/bin/nginxReloader.sh
RUN chmod +x /usr/local/bin/docker-entrypoint.sh

RUN apt-get update && apt-get install -y --no-install-recommends apt-utils
RUN apt-get install inotify-tools -y

ENTRYPOINT [ "/usr/local/bin/docker-entrypoint.sh" ]
# CMD ["/usr/local/openresty/bin/openresty", "-g", "daemon off;"] (don't know what this would do, but I wouldn't know what to replace `openresty` with in my case, so I omitted this line from the tutorial at the link I provided)

但是，当尝试 docker-compose up --build 时，它会出现 No such file or directory for line exec "$@" 错误> 在 nginxReloader.sh 文件中或者我在执行 docker-compose up 时得到了 nginx exited with code 0 (当然，我尝试了不同的东西在这些错误之间，但不记得到底是什么)。

此外，我尝试将 Dockerfile 中的 ENTRYPOINT 直接指向 nginxReloader.sh (ENTRYPOINT [ "/usr/local/bin/nginxReloader.sh"]) 但是当尝试 docker -compose up 我只得到 2 行输出:

Setting up watches.
Watches established.

nginx 永远不会启动(我想这是因为 while true 循环)。

此外，如果我在运行 docker-compose up 时完全删除 Dockerfile 中的 ENTRPOINT 行，我仍然会得到以下输出:

my-site_nginx    | /docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
my-site_nginx    | /docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
my-site_nginx    | /docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
my-site_nginx    | 10-listen-on-ipv6-by-default.sh: error: can not modify /etc/nginx/conf.d/default.conf (read-only file system?)
my-site_nginx    | /docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
my-site_nginx    | /docker-entrypoint.sh: Configuration complete; ready for start up

就像 Docker 以某种方式知道该文件在文件夹中，与 Dockerfile 处于同一级别...没有错误，但更改配置仍然不会触发 nginx -s reload

Answer 1

你的问题是当你用你的新入口点覆盖它时你没有运行原始入口点，所以 nginx 将不会启动。改变

docker-entrypoint.sh:

#!/bin/bash
###########

sh -c "nginxReloader.sh &"
exec "$@"

到

docker-entrypoint.sh:

#!/bin/bash
###########

sh -c "nginxReloader.sh &"
exec /docker-entrypoint.sh "$@"