Docker containers cannot access the external network

The Docker container cannot access the external network:

The following situations occur:

The Docker container cannot access the external network

Other machines in the LAN cannot access the docker service

Startup error docker warning ipv4 forwarding is disabled. networking will not work

Solution:

Use the following command to open sysctl.conf File

vi /etc/sysctl.conf

Then add the following code in the sysctl.conf file:

net.ipv4.ip_forward=1

You can use the sysctl net.ipv4.ip_forward command to check whether the modification is successful. The results returned after the modification is successful are as follows:

net.ipv4.ip_forward = 1

Then use the following command to restart the network service:

systemctl restart network

For more related tutorials, please pay attention to thedocker tutorialcolumn of the PHP Chinese website.

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