My docker container has no internet

0 votes

It was working fine before, but it has now stopped. 

I tried the following commands without success:

docker run -dns base ping

base docker ping

sysctl -w net.ipv4.ip_forward=1- on both the host and the container

I only get the unknown host 

Version 0.7.0 of Docker


Any suggestions?

Jan 2, 2023 in DevOps on Cloud by Damonlang
• 1,230 points

1 answer to this question.

0 votes

To begin, run cat /etc/resolv.conf in the docker container. If it uses an invalid DNS server, such as nameserver 127.0.x.x, the container will be unable to resolve domain names into IP addresses, causing ping to fail.

The second step is to run cat /etc/resolv.conf on the host machine. Every time a container is started, Docker copies the host's /etc/resolv.conf to the container. If the host's /etc/resolv.conf is incorrect, the docker container will be as well.

If you discover that the host's /etc/resolv.conf is incorrect, you have two choices:

  1. The DNS server is hardcoded in daemon.json. This is simple, but not ideal if you anticipate the DNS server changing.

  2. Fix the hosts' /etc/resolv.conf file. This is a little more difficult, but it is generated dynamically, and the DNS server is not hardcoded.

answered Jan 3, 2023 by David
• 220 points

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