[ 常見問題 ] DNS Not Resolving under Network [CentOS8]

 Source From Here

Question
We can't ping google.com inside Docker container in CentOS8:

$ docker exec -it traefik ping google.com
ping: bad address 'google.com

HowTo
Fast workaround

# sudo nano /etc/firewalld/firewalld.conf

in config file change

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1. FirewallBackend=nftables  

to

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1. FirewallBackend=iptables  

Save change and reload firewalld

# sudo systemctl restart firewalld.service

it should help you work with docker but I advise rollback this setting when docker provides solution.