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How to solve the problem of domain name resolution failure in docker container

王林

Apr 14, 2020 am 10:56 AM

dockerdomain name

How to solve the problem of domain name resolution failure in docker container

Cause:

Linux system does not turn on the IP forwarding function by default.

Solution:

Just turn on the IP forwarding function.

Solution:

1. Confirm the status of the IP forwarding function

Use the following command to view the /proc file system,

cat /proc/sys/net/ipv4/ip_forward012

If the value in the above file is 0, it means that IP forwarding is prohibited; if it is 1, it means that the IP forwarding function has been turned on.

2. If you want to turn on the IP forwarding function, you can directly modify the above file:

echo 1 > /proc/sys/net/ipv4/ip_forward1

Change the content of the file from 0 to 1. Disabling IP forwarding changes 1 to 0.

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

net.ipv4.ip_forward = 11

4. After modification, you can restart the system to make the modification effective, or execute the following command to make the modification effective

sysctl -p /etc/sysctl.conf1

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

Note: centos7 operates the /usr/lib/sysctl.d/50-default.conf file

Recommended tutorial: docker tutorial

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