https://github.com/ferranbt/docker-dns-resolution

https://github.com/ferranbt/docker-dns-resolution

Last synced: 10 days ago
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• Host: GitHub
• URL: https://github.com/ferranbt/docker-dns-resolution
• Owner: ferranbt
• Created: 2022-11-20T18:20:00.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2022-11-20T18:20:25.000Z (almost 2 years ago)
• Last Synced: 2024-06-20T23:52:31.256Z (5 months ago)
• Language: Go
• Size: 6.84 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Docker custom DNS resolution

This repo describes how to run a custom DNS resolution system for `Docker` containers that does not require any sudo application (outside `Docker` itself).

By default, `Docker` provides a DNS resolution mechanism in which `Docker` containers with the `--name ` flag can be reached by its name from other `Docker` containers. However, this utility only works for simple use cases.

Deploy `coredns` service:

```

$ docker run --name coredns --restart=always --volume=$PWD/coredns/:/root/ coredns/coredns -conf /root/Corefile

```

Get the ip of the `Dns` server:

```

$ docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' coredns

172.17.0.2

```

Deploy the `Grpc` resolution service:

```

$ go run main.go

```

Deploy a `Docker` container connected to the DNS service and make a DNS query:

```

$ docker run --dns 172.17.0.2 -it tutum/dnsutils /bin/sh

# dig example.com

```

The console of the `Grpc` resolution backend should print the `DNS` query to be resolved.