如何在docker-compose中设置DNS容器？ [英] How do I set up a DNS container inside docker-compose?

问题描述

我认为这可能是一个XY问题，所以我将包括问题的上下文，因为我不知道解决这个问题的最佳方法。

I think this may be an XY problem, so I'll include the context of the question since I don't know the best way to solve this problem.

我在AWS上设置了一个kubernetes环境，这样我有两个部分，一个nginx容器和一个后端服务（我称之为SvcA）。由于后端服务可以来回，在我的nginx配置中，我有一些看起来像：

I have a kubernetes environment set up on AWS such that I have two parts, an nginx container, and a backend service (which I'll call SvcA). Since the backend service can come and go, in my nginx config I have something that looks like:

resolver kube-dns.kube-system.svc.cluster.local valid=60s ipv6=off;

server {
   # stuff
   location / {
       set $backend "SvcA.default.svc.cluster.local:8000";
       proxy_pass http://$backend;
   }
}

此设置在kubernetes上运行良好，但我想要方式在我的本地机器上（几乎）完全相同，用于测试/开发，但没有使用kubernetes的所有开销。我想做的是将这两个容器（nginx，SvcA）粘贴到docker-compose文件中并使其工作。我遇到的问题是，nginx的解析器是硬编码为kubernetes的URL，我认为可能的工作的解决方案是容器是一个dns，它的唯一条目是指向 SvcA.default.svc.cluster.local到名称docker-compose assigns。

This setup works well on kubernetes, but I want a way have having the (almost) exact same set up on my local machine for testing/development but without all the overhead of using kubernetes. What I want to do is stick these two containers (nginx, SvcA) into a docker-compose file and have it working that way. The problem I've run into, is that the resolver for the nginx is hard-coded to be the url on kubernetes, and the solution I think may work is to have container that is a dns, and it's sole entry is to point "SvcA.default.svc.cluster.local" to the name docker-compose assigns.

我不确定这是解决问题的最佳方式，如果这是我不够了解DNS配置来设置这个。这是我问题的最佳解决方案吗？如果是这样，我如何配置一个dns服务器来处理这个问题？

I'm unsure if this is the best way to solve the problem, and if it is, I don't know enough about DNS configuration to set this up. Is this the best solution to my problem, and if so, how would I configure a dns server to handle this?

推荐答案

我不知道你是否需要一个dns。

i am not sure if you need a dns.

你可以这样做，即使URL是硬编码的
例如docker-compose.yml

you can do something like this, even if the URL is hardcoded eg docker-compose.yml

version: '2'
services:
  service1:
    ...
   networks:
     back-tier:
       ipv4_address: "172.16.238.10"
  service2:
    ...
    networks:
      back-tier:
        ipv4_adress: "172.16.238.11"
networks:
  back-tier:
    driver: bridge
    ipam:
      driver: default
      config:
      - subnet: 172.16.238.0/24
        gateway: 172.16.238.1

你可以甚至设置每个容器等的主机名，你也可以在它们之间建立一个链接。如果你需要它是循环的，你可以使用extra_hosts参数来实现。

you can even set hostnames for each container, etc, you could also make a link between them. if you need it to be circular you can do it with extra_hosts parameter.

如果应该能够找到你需要的所有信息：
https://docs.docker.com/compose/compose-file/

if should be able to find all the info you need over here: https://docs.docker.com/compose/compose-file/

如果容器在同一个网络上，他们应该能够相互交谈

if the containers are on the same network they should be able to talk to each other

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