Docker Compose主机名命令不起作用 [英] Docker Compose hostname command not working

问题描述

我无法获得Docker Compose

I'm unable to get the Docker Compose hostname command to work.

我正在运行一个简单的 docker-compose.yml :

I'm running a simple docker-compose.yml:

version: '3'
services:
  redis1:
    image: "redis:alpine"
    hostname: redis1host
  redis2:
    image: "redis:alpine"
    hostname: redis2host

一旦我使用 docker-compose up 运行它，我应该能够运行 docker-compose exec redis1/bin/ash ，然后 ping redis2host 与其他Redis容器通信，但ping不能到达其目的地.我可以使用 ping redis2 ping其他Redis容器.

Once I run this with docker-compose up, I should be able to run docker-compose exec redis1 /bin/ash and then ping redis2host to talk to the other Redis container, but the ping just doesn't reach its destination. I can ping the other Redis container with ping redis2.

ping redishost2 应该可以，不是吗?

推荐答案

hostname 指令只是在容器内设置主机名(即，您为响应而返回的名称主机名或 uname -n 命令).它不会导致该服务的DNS别名.为此，您需要别名指令.由于该指令是针对每个网络的，因此您需要明确说明网络，而不是使用compose默认值，例如:

The hostname directive simply sets the hostname inside the container (that is, the name you get back in response to the hostname or uname -n commands). It does not result in a DNS alias for the service. For that, you want the aliases directive. Since that directive is per-network, you need to be explicit about networks rather than using the compose default, for example:

version: '3'
services:
  redis1:
    image: "redis:alpine"
    hostname: redis1host
    networks:
      redis:
        aliases:
          - redis1host
  redis2:
    image: "redis:alpine"
    hostname: redis2host
    networks:
      redis:
        aliases:
          - redis2host

networks:
  redis:

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