nginx - 当 docker-compose 的一部分时，自定义 nginx 容器立即退出

Question

我正在尝试学习如何将 docker compose 与一个简单的 nginx 容器设置一起使用，该容器将请求重新路由到一个 ghost 容器。我使用的是标准的 ghost 镜像，但有一个自定义的 nginx 镜像(继承自标准镜像)。

当我使用“docker-compose up”运行组合时，它会立即以“docker_nginx_1 exited with code 0”退出。但是，当我手动构建和运行它时，它运行良好，我可以将浏览器导航到容器并查看默认的 nginx 页面。我对我的撰写文件有什么误解，导致它的行为与自定义构建不同？我可以改变什么让它继续运行？

免责声明:我也在学习 nginx，所以一次学习两件事可能会给我带来不必要的问题。

编辑:原始文件有点复杂，但我将问题简化为:如果我对自定义图像使用 build 命令，该图像除了继承默认 nginx 图像之外什么都不做，它会立即退出。如果我使用默认的 nginx 镜像，它可以工作。这些是现在相关的文件:

编写文件:

ghost:
 expose:
   - "2368"
 image: ghost

nginx:
  # image: nginx << If I use this instead of my custom build, it doesn't exit
  build: ./nginx
  ports:
    - "80:80"
    - "443:443"
  links:
   - ghost

nginx/Dockerfile:

FROM nginx

原始文件(与上述相同的撰写文件):

nginx/Dockerfile:

FROM nginx
RUN rm /etc/nginx/nginx.conf
COPY conf/nginx.conf /etc/nginx/nginx.conf
COPY conf/sites-available/ghost /etc/nginx/sites-available/ghost
RUN mkdir /etc/nginx/sites-enabled
RUN ln -s /etc/nginx/sites-available/ghost /etc/nginx/sites-enabled/ghost

EXPOSE 80 443

# Is this even the right command I have no idea

CMD service nginx start

nginx/conf/nginx.conf:

daemon off;

user  nginx;
# Let nginx figure out the processes I guess
worker_processes  auto;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    include /etc/nginx/conf.d/*.conf;
}

nginx/conf/sites-available/ghost

server {
  listen 80;
  server_name 127.0.0.1;
  access_log /var/log/nginx/localhost.log;

  location / {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header HOST $http_host;
    proxy_set_header X-NginX-Proxy true;

    proxy_pass http://0.0.0.0:2368;
    proxy_redirect off;
  }
}

运行作曲:

plays-MacBook-Pro:docker play$ docker-compose up
Creating docker_ghost_1...
Creating docker_nginx_1...
Attaching to docker_ghost_1, docker_nginx_1
docker_nginx_1 exited with code 0
Gracefully stopping... (press Ctrl+C again to force)
Stopping docker_ghost_1... done

手动运行:

plays-MacBook-Pro:nginx play$ docker build --no-cache -t nginx_custom .
Sending build context to Docker daemon 8.704 kB
Step 0 : FROM nginx
 ---> 914c82c5a678
Step 1 : RUN rm /etc/nginx/nginx.conf
 ---> Running in 4ce9de96bb36
 ---> 98f97a9da4fc
Removing intermediate container 4ce9de96bb36
Step 2 : ADD conf/nginx.conf /etc/nginx/nginx.conf
 ---> dd3e089208a9
Removing intermediate container 36b9a47e0806
Step 3 : ADD conf/sites-available/ghost /etc/nginx/sites-available/ghost
 ---> 55fae53e5810
Removing intermediate container a82741d24af4
Step 4 : RUN mkdir /etc/nginx/sites-enabled
 ---> Running in 7659ead01b7b
 ---> 406be1c42394
Removing intermediate container 7659ead01b7b
Step 5 : RUN ln -s /etc/nginx/sites-available/ghost /etc/nginx/sites-enabled/ghost
 ---> Running in e9658a08affa
 ---> 021a84216e8a
Removing intermediate container e9658a08affa
Step 6 : EXPOSE 80 443
 ---> Running in 230e4523794c
 ---> 23d85e1a04cb
Removing intermediate container 230e4523794c
Step 7 : CMD service nginx start
 ---> Running in 209e129cae21
 ---> d7004d6fa223
Removing intermediate container 209e129cae21
Successfully built d7004d6fa223
plays-MacBook-Pro:nginx play$ docker run -t nginx_custom
[It sits here on an empty line, running in the background]

Answer 1

Dockerfile 中的 CMD 应该启动一个需要在前台运行的进程。命令 service nginx start 以守护模式运行进程，因此您的容器干净地退出，因为 service 命令退出。

使用下面的CMD ["nginx", "-g", "daemon off;"]启动nginx(取自official image)，应该可以正常工作了。