☰

Docker Swarm 和 Netfilter

tag-icon • tag-icon nginx debian iptables asp.net docker-swarm
Docker Swarm 和 Netfilter

我已经在我的 VPS 上部署了一个 Docker Swarm 服务器，用于处理 Asp.Net Core 应用程序。我想通过 Nginx Web 服务器来提供此应用程序。

假设我的 Web 应用程序是我通过 .Net Core CLI 命令创建的原始应用程序：

dotnet new webapp mywebapp

Dockerfile（简化）：

FROM mcr.microsoft.com/dotnet/core/sdk:3.0-alpine as builder
WORKDIR /app
COPY . .
RUN dotnet publish -c Release -o publish
WORKDIR /app/publish
ENTRYPOINT ["dotnet", "MyWebApp.dll"]

我的docker-compose.yml样子如下（简化）：

version: '3'

services:
  app:
    image: edouard/mywebapp:latest
    ports:
      - 9000:80

我的 nginx 配置如下：

server {
    listen 443 ssl;
    server_name myservername.com;

    ssl_certificate     /path/to/ssl_certificate;
    ssl_certificate_key /path/to/ssl_certificate_key;

   location / {
        proxy_pass         http://localhost:9000;
        proxy_http_version 1.1;
        proxy_set_header   Upgrade $http_upgrade;
        proxy_set_header   Connection keep-alive;
        proxy_set_header   Host $host;
        proxy_cache_bypass $http_upgrade;
        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header   X-Forwarded-Proto $scheme;
    } 

}
server {
    listen 80;
    server_name myservername.com;
    return 301 https://$host$request_uri;
}

如您所见，我使用 Nginx 作为反向代理服务器，将所有 HTTP/HTTPS 流量从 80 和 443 端口重定向到本地 9000 端口，Docker Swarm 将其映射到容器内的 80 端口，Kestrel 服务器正在该端口上运行。

在 上https://myservername.com，一切都运行良好。但问题是：人们还可以在 上访问我的 Web 应用程序http://myservername.com:9000！这是我不想要的。

我想我必须配置防火墙，以便只允许流量到 80 和 443 端口（注意让 22 端口用于 SSH 等）。我读了一些教程来了解如何做到这一点，但是，Docker Swarm 也在处理防火墙！

当我启动时sudo iptables -L -v：

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain FORWARD (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         
 3417  873K DOCKER-USER  all  --  any    any     anywhere             anywhere            
 3417  873K DOCKER-INGRESS  all  --  any    any     anywhere             anywhere            
   31  9043 DOCKER-ISOLATION-STAGE-1  all  --  any    any     anywhere             anywhere            
    0     0 ACCEPT     all  --  any    docker0  anywhere             anywhere             ctstate RELATED,ESTABLISHED
    0     0 DOCKER     all  --  any    docker0  anywhere             anywhere            
    0     0 ACCEPT     all  --  docker0 !docker0  anywhere             anywhere            
    0     0 ACCEPT     all  --  docker0 docker0  anywhere             anywhere            
   18  7620 ACCEPT     all  --  any    docker_gwbridge  anywhere             anywhere             ctstate RELATED,ESTABLISHED
    0     0 DOCKER     all  --  any    docker_gwbridge  anywhere             anywhere            
   13  1423 ACCEPT     all  --  docker_gwbridge !docker_gwbridge  anywhere             anywhere            
    0     0 DROP       all  --  docker_gwbridge docker_gwbridge  anywhere             anywhere            

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain DOCKER (2 references)
 pkts bytes target     prot opt in     out     source               destination         

Chain DOCKER-ISOLATION-STAGE-1 (1 references)
 pkts bytes target     prot opt in     out     source               destination         
    0     0 DOCKER-ISOLATION-STAGE-2  all  --  docker0 !docker0  anywhere             anywhere            
   13  1423 DOCKER-ISOLATION-STAGE-2  all  --  docker_gwbridge !docker_gwbridge  anywhere             anywhere            
   31  9043 RETURN     all  --  any    any     anywhere             anywhere            

Chain DOCKER-ISOLATION-STAGE-2 (2 references)
 pkts bytes target     prot opt in     out     source               destination         
    0     0 DROP       all  --  any    docker0  anywhere             anywhere            
    0     0 DROP       all  --  any    docker_gwbridge  anywhere             anywhere            
   13  1423 RETURN     all  --  any    any     anywhere             anywhere            

Chain DOCKER-USER (1 references)
 pkts bytes target     prot opt in     out     source               destination         
 3417  873K RETURN     all  --  any    any     anywhere             anywhere            

Chain DOCKER-INGRESS (1 references)
 pkts bytes target     prot opt in     out     source               destination         
 1567  101K ACCEPT     tcp  --  any    any     anywhere             anywhere             tcp dpt:9000
 1270  698K ACCEPT     tcp  --  any    any     anywhere             anywhere             state RELATED,ESTABLISHED tcp spt:9000
   31  9043 RETURN     all  --  any    any     anywhere             anywhere

我该如何配置防火墙以使其不与Docker Swarm交互？ 我找到了部分答案：

然而，我发现它非常复杂，而且令我惊讶的是 Docker 的博客上没有对这个问题的官方答案。

版本：

  • VPS: Debian 10.2
  • Docker 引擎：19.03.5
  • Nginx：1.16.1
  • Iptables：1.8.2

感谢您的帮助。

答案1

您可以尝试绑定 localhost 而不是默认的 0.0.0.0 地址：

services:
  app:
    image: edouard/mywebapp:latest
    ports:
      - '127.0.0.1:9000:80'

https://docs.docker.com/compose/compose-file/#ports

相关内容