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This article will explain in detail what to do if the domain name cannot be resolved inside the Docker container. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Find a problem

Recently, a project is deployed in the work, and the external network is needed within the project. Upload a file to a cloud, but keep reporting to unknown host, unable to resolve the domain name, and then find the reason for a long time. Let's take a look at the detailed solution:

Solution method

The IP forwarding feature is not enabled by default on the Linux system. To confirm the status of the IP forwarding feature, you can view the / proc file system and use the following command:

Cat / proc/sys/net/ipv4/ip_forward0

If the value in the above file is 0, IP forwarding is prohibited; if 1, the IP forwarding feature is enabled. To enable the IP forwarding feature, you can modify the above file directly:

Echo 1 > / proc/sys/net/ipv4/ip_forward

Change the contents of the file from 0 to 1. Disable IP forwarding to change 1 to 0.

The above command does not save the changes to the IP forwarding configuration, and the original value will be used the next time the system starts. To permanently modify IP forwarding, you need to modify the / etc/sysctl.conf file and modify the value of the following line:

Net.ipv4.ip_forward = 1

After modification, you can restart the system to make the changes take effect, or you can execute the following command to make the changes take effect:

Sysctl-p / etc/sysctl.conf

After the above configuration, the IP forwarding function is permanently enabled.

This is the end of the article on "what to do if the domain name cannot be resolved inside the Docker container". I hope the above content can be helpful to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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