Docker容器无法连接到主机：没有路由到主机 [英] Docker container cannot connect to host machine: No route to host

问题描述

我一直在尝试使用docker compose设置docker环境。让我感到困扰的一个问题是我的docker容器无法访问我的主机。

I've been trying to setup a docker environment using docker compose. One issue that has me stumped is that my docker containers cannot reach my host machine.

我使用以下撰写文件设置了一个容器：

I setup a container using the following compose file:

version: '3'
services:
  webapp:
    image: ...
    ports:
      - "8080:8080"

当我进入容器时，可以对主机进行ping操作机器：

When I enter the container, I am able to ping my host machine:

ping ${dockerHostIP}

但是，当我尝试使用容器内的curl检索主页时：

However when I try and retrieve the home page using curl inside the container:

curl http://${dockerHostIP}:8080

我知道了：

curl: (7) Failed connect to ${dockerHostIP}:8080; No route to host

我无法弄清楚该如何解决此无托管路径错误。不幸的是，由于Web应用程序在内部使用其主机名发出请求，因此我必须能够做到这一点。

I cannot figure out what should be done to resolve this No route to host error. Unfortunately I need to be able to do this as the web application makes requests using its hostname internally.

Traceroute结果：

Traceroute Results:

traceroute ${dockerHostIP}
traceroute to ${dockerHostIP} (${dockerHostIP}), 30 hops max, 60 byte packets
 1  ${dockerHostName} (${dockerHostIP})  0.039 ms !X  0.012 ms !X  0.007 ms !X

推荐答案

令我惊讶的是，这实际上是我的防火墙问题。

To my surprise, it was actually a firewall issue in my case.

在Docker主机上更新/启用tcp端口[2375]

Update/Enable the tcp port [2375] on the docker host machine fixes the issue.

sudo firewall-cmd --zone=public --add-port=2375/tcp --permanent

sudo firewall-cmd --reload 

有用的链接：
1. 在此处输入链接描述
2. 在此处输入链接描述

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