docker-compose部署alfg/nginx-rtmp后修改nginx.conf重启失效求助

我通过docker-compose部署了alfg/nginx-rtmp镜像，已将本地./conf/nginx/nginx.conf挂载到容器内的/etc/nginx/nginx.conf。尝试编辑本地nginx.conf文件，删除以下hls_variant条目：

hls_variant _720p2628kbs BANDWIDTH=2628000,RESOLUTION=1280x720;
hls_variant _480p1128kbs BANDWIDTH=1128000,RESOLUTION=854x480;
hls_variant _360p878kbs BANDWIDTH=878000,RESOLUTION=640x360;
hls_variant _240p528kbs BANDWIDTH=528000,RESOLUTION=426x240;
hls_variant _240p264kbs BANDWIDTH=264000,RESOLUTION=426x240;

但系统重启后这些条目又恢复原样，手动编辑也无法解决问题。

我的docker-compose.yml配置 #

version: '3.7'
services:
  rtmp:
    image: alfg/nginx-rtmp
    container_name: my_container
    ports:
      - '800:80'
      - '1935:1935'
    volumes:
      - ./conf/nginx/nginx.conf:/etc/nginx/nginx.conf

原始nginx.conf内容 #

daemon off;

error_log /dev/stdout info;

events {
    worker_connections 1024;
}

rtmp {
    server {
        listen 1935;
        chunk_size 4000;

        application stream {
            live on;

            exec ffmpeg -i rtmp://localhost:1935/stream/$name
              -c:a libfdk_aac -b:a 128k -c:v libx264 -b:v 2500k -f flv -g 30 -r 30 -s 1280x720 -preset superfast -profile:v baseline rtmp://localhost:1935/hls/$name_720p2628kbs
              -c:a libfdk_aac -b:a 128k -c:v libx264 -b:v 1000k -f flv -g 30 -r 30 -s 854x480 -preset superfast -profile:v baseline rtmp://localhost:1935/hls/$name_480p1128kbs
              -c:a libfdk_aac -b:a 128k -c:v libx264 -b:v 750k -f flv -g 30 -r 30 -s 640x360 -preset superfast -profile:v baseline rtmp://localhost:1935/hls/$name_360p878kbs
              -c:a libfdk_aac -b:a 128k -c:v libx264 -b:v 400k -f flv -g 30 -r 30 -s 426x240 -preset superfast -profile:v baseline rtmp://localhost:1935/hls/$name_240p528kbs
              -c:a libfdk_aac -b:a 64k -c:v libx264 -b:v 200k -f flv -g 15 -r 15 -s 426x240 -preset superfast -profile:v baseline rtmp://localhost:1935/hls/$name_240p264kbs;
        }

        application hls {
            live on;
            hls on;
            hls_fragment_naming system;
            hls_fragment 5;
            hls_playlist_length 10;
            hls_path /opt/data/hls;
            hls_nested on;

            hls_variant _720p2628kbs BANDWIDTH=2628000,RESOLUTION=1280x720;
            hls_variant _480p1128kbs BANDWIDTH=1128000,RESOLUTION=854x480;
            hls_variant _360p878kbs BANDWIDTH=878000,RESOLUTION=640x360;
            hls_variant _240p528kbs BANDWIDTH=528000,RESOLUTION=426x240;
            hls_variant _240p264kbs BANDWIDTH=264000,RESOLUTION=426x240;
        }
    }
}

http {
    root /www/static;
    sendfile off;
    tcp_nopush on;
    server_tokens off;
    access_log /dev/stdout combined;

    # Uncomment these lines to enable SSL.
    # ssl_protocols TLSv1.2 TLSv1.3;
    # ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
    # ssl_prefer_server_ciphers off;
    # ssl_session_cache shared:SSL:10m;
    # ssl_session_timeout 1d;

    server {
        listen 80;

        # Uncomment these lines to enable SSL.
        # Update the ssl paths with your own certificate and private key.
            
        # listen 443 ssl;
        # ssl_certificate     /opt/certs/example.com.crt;
        # ssl_certificate_key /opt/certs/example.com.key;

        location /hls {
            types {
                application/vnd.apple.mpegurl m3u8;
                video/mp2t ts;
            }
            root /opt/data;
            add_header Cache-Control no-cache;
            add_header Access-Control-Allow-Origin *;
        }

        location /live {
          alias /opt/data/hls;
          types {
              application/vnd.apple.mpegurl m3u8;
              video/mp2t ts;
          }
          add_header Cache-Control no-cache;
          add_header Access-Control-Allow-Origin *;
        }

        location /stat {
            rtmp_stat all;
            rtmp_stat_stylesheet stat.xsl;
        }

        location /stat.xsl {
            root /www/static;
        }

        location /crossdomain.xml {
            default_type text/xml;
            expires 24h;
        }
    }
}

1. 同步修改FFmpeg命令与hls_variant #

你只删除了hls应用下的hls_variant条目，但stream应用中的FFmpeg命令仍在生成这些变体流，这会导致配置逻辑冲突。打开本地./conf/nginx/nginx.conf，同时删除stream块中对应变体的FFmpeg命令行。
示例（仅保留720p流）：

exec ffmpeg -i rtmp://localhost:1935/stream/$name
  -c:a libfdk_aac -b:a 128k -c:v libx264 -b:v 2500k -f flv -g 30 -r 30 -s 1280x720 -preset superfast -profile:v baseline rtmp://localhost:1935/hls/$name_720p2628kbs;

2. 正确重启容器 #

不要直接重启系统，而是重启Docker容器确保配置生效：

docker-compose down
docker-compose up -d

或直接重启指定容器：

docker restart my_container

3. 验证挂载与文件权限 #

检查本地配置文件权限，确保容器能读取：

chmod 644 ./conf/nginx/nginx.conf

进入容器确认配置是否正确加载：

docker exec -it my_container cat /etc/nginx/nginx.conf

如果显示的仍是原始内容，检查挂载路径是否基于docker-compose.yml所在目录的相对路径。

4. 清理旧流文件 #

容器内/opt/data/hls目录的旧流文件可能残留，可在docker-compose.yml中添加挂载路径方便清理：

volumes:
  - ./conf/nginx/nginx.conf:/etc/nginx/nginx.conf
  - ./data/hls:/opt/data/hls

重启容器后，删除本地./data/hls下的旧文件即可。

内容的提问来源于stack exchange，提问作者Haj-Rezvan