解答：docker部署seafile修改80端口映射到主机其他端口，无法访问

问题见：https://bbs.seafile.com/t/docker-seafile-80/3195/5

但是回答的比较简单，对于刚刚入手 docker 的朋友可能不太熟悉

步骤一

修改部分已用中文标注

#以下为 docker-compose.yml 可适当修改其中的配置
version: '2.0'
services:
  db:
    image: mariadb:10.1
    container_name: seafile-mysql
    environment:
      - MYSQL_ROOT_PASSWORD=db_dev  # Requested, set the root's password of MySQL service.
      - MYSQL_LOG_CONSOLE=true
    volumes:
      - /opt/seafile-mysql/db:/var/lib/mysql  # Requested, specifies the path to MySQL data persistent store.
    networks:
      - seafile-net

  memcached:
    image: memcached:1.5.6
    container_name: seafile-memcached
    entrypoint: memcached -m 256
    networks:
      - seafile-net
          
  seafile:
    image: seafileltd/seafile-mc:latest
    container_name: seafile
    ports:
      - "8088:8088"  # 注意端口在这里更改，如8088(通常只修改宿主机端口号即可如：8088:80)
#      - "443:443"  # If https is enabled, cancel the comment.
    volumes:
      - /opt/seafile-data:/shared   # Requested, specifies the path to Seafile data persistent store.
      - /your/path/seafile.nginx.conf.template:/templates/seafile.nginx.conf.template:ro   # 添加这个文件映射(该命令用于修改docker内部端口号，如不需要可以注释)
    environment:
      - DB_HOST=db
      - DB_ROOT_PASSWD=db_dev  # Requested, the value shuold be root's password of MySQL service.
#      - TIME_ZONE=Asia/Shanghai # Optional, default is UTC. Should be uncomment and set to your local time zone.
      - SEAFILE_ADMIN_EMAIL=me@example.com # Specifies Seafile admin user, default is 'me@example.com'.
      - SEAFILE_ADMIN_PASSWORD=asecret     # Specifies Seafile admin password, default is 'asecret'.
      - SEAFILE_SERVER_LETSENCRYPT=false   # Whether use letsencrypt to generate cert.
      - SEAFILE_SERVER_HOSTNAME=seafile.example.com # Specifies your host name.
    depends_on:
      - db
      - memcached
    networks:
      - seafile-net

networks:
  seafile-net:

步骤二

以下为修改docker内部端口号，如不需要可以忽略。
步骤一中的/your/path/seafile.nginx.conf.template 文件从哪里来呢？
官方GitHub上有： 传送门

当然最稳妥的做法是进入容器内部复制一份出来，因为版本问题可能不一致。拷贝方法：

# 进入容器
docker exec -it seafile /bin/bash
#复制输出的内容，保存成文件
cat /templates/seafile.nginx.conf.template

步骤三

按需修改步骤二中的文件，如修改端口后（修改部分已用中文标注）：

# -*- mode: nginx -*-
# Auto generated Aat {{ current_timestr }}
{% if https -%}
server {
    listen 80; # 这里是https的证书监听端口，没用到可以不用修改
    server_name _ default_server;

    # allow certbot to connect to challenge location via HTTP Port 80
    # otherwise renewal request will fail
    location /.well-known/acme-challenge/ {
        alias /var/www/challenges/;
        try_files $uri =404;
    }

    location / {
        rewrite ^ https://{{ domain }}$request_uri? permanent;
    }
}
{% endif -%}

server {
{% if https -%}
    listen 443; # https 监听端口，没用到可以不修改
    ssl on;
    ssl_certificate      /shared/ssl/{{ domain }}.crt;
    ssl_certificate_key  /shared/ssl/{{ domain }}.key;

    ssl_ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS;

    # TODO: More SSL security hardening: ssl_session_tickets & ssl_dhparam
    # ssl_session_tickets on;
    # ssl_session_ticket_key /etc/nginx/sessionticket.key;
    # ssl_session_cache shared:SSL:10m;
    # ssl_session_timeout 10m;
{% else -%}
    listen 8088; # 默认http访问，修改这里的监听端口
{% endif -%}

    server_name {{ domain }};

    client_max_body_size 10m;

    location / {
        proxy_pass http://127.0.0.1:8000/;
        proxy_read_timeout 310s;
        proxy_set_header Host $host;
        proxy_set_header Forwarded "for=$remote_addr;proto=$scheme";
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Connection "";
        proxy_http_version 1.1;

        client_max_body_size 0;
        access_log      /var/log/nginx/seahub.access.log seafileformat;
        error_log       /var/log/nginx/seahub.error.log;
    }

    location /seafhttp {
        rewrite ^/seafhttp(.*)$ $1 break;
        proxy_pass http://127.0.0.1:8082;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        client_max_body_size 0;
        proxy_connect_timeout  36000s;
        proxy_read_timeout  36000s;
        proxy_request_buffering off;
        access_log      /var/log/nginx/seafhttp.access.log seafileformat;
        error_log       /var/log/nginx/seafhttp.error.log;
    }

    location /seafdav {
        client_max_body_size 0;
        fastcgi_pass    127.0.0.1:8080;
        fastcgi_param   SCRIPT_FILENAME     $document_root$fastcgi_script_name;
        fastcgi_param   PATH_INFO           $fastcgi_script_name;

        fastcgi_param   SERVER_PROTOCOL     $server_protocol;
        fastcgi_param   QUERY_STRING        $query_string;
        fastcgi_param   REQUEST_METHOD      $request_method;
        fastcgi_param   CONTENT_TYPE        $content_type;
        fastcgi_param   CONTENT_LENGTH      $content_length;
        fastcgi_param   SERVER_ADDR         $server_addr;
        fastcgi_param   SERVER_PORT         $server_port;
        fastcgi_param   SERVER_NAME         $server_name;

        access_log      /var/log/nginx/seafdav.access.log seafileformat;
        error_log       /var/log/nginx/seafdav.error.log;
    }

    location /media {
        root /opt/seafile/seafile-server-latest/seahub;
    }

    # For letsencrypt
    location /.well-known/acme-challenge/ {
        alias /var/www/challenges/;
        try_files $uri =404;
    }
}

步骤四

最重要的一步，重启你的 docker，强烈建议先停止容器，再重新启动（docker-compose down、docker-compose up -d）。我的版本（seafile-server-7.0.5）使用 docker-compose restart 并不其作用，浪费了十几分钟排查问题！！！
注意：端口号尽量避开 seafile 内部已经占用的8000、8080、8082等端口

注意⚠️

如果都修改后仍不起效，请检查如下问题：

1. 宿主机是否放行新定义的端口号如：8088
2. 检查docker内部 /shared/nginx/conf/seafile.nginx.conf 生成日期是否是刚刚生成的

针对检查项2可做如下调整：

# 进入容器
docker exec -it seafile /bin/bash
#删除存在的文件, 再次重启 seafile docker 会自动生成
rm -f /shared/nginx/conf/seafile.nginx.conf

问题2来源于网友的机器，排查发现该文件/shared/nginx/conf/seafile.nginx.conf存在 .swp 崩溃文件，猜测很可能是docker启动异常时导致。

有心力的同学可以查看 GitHub 来了解 seafile-docker 的详细内容：https://github.com/haiwen/seafile-docker