The docker image started successfully, but it cannot be accessed. What happened?

Problem:

The docker image started successfully but cannot be accessed.

(Related recommendations: docker tutorial)

Solution:

vi /etc/sysctl.conf

or

vi /usr/lib/sysctl.d/00-system.conf

Add the following code:

net.ipv4.ip_forward=1

Restart the network service

systemctl restart network

Check whether the modification is successful

sysctl net.ipv4.ip_forward

If the return value is "net.ipv4.ip_forward = 1", it means success.

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