What to do if yum cannot be used in docker

Problem:

Dockerfile reports that yum cannot be used, as shown in the figure:

Solution:

vim /etc/sysctl.conf

net.ipv4.ip_forward=1   ##添加路由转发

Or:

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

net.ipv4.ip_forward=1

Restart the network card and test again.

Recommended related tutorials: docker tutorial

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