[LINUX] Check when the Docker container does not connect to the Internet

1. Are the DNS settings appropriate?

In the container

cat /etc/resolv.conf

Let's set the nameserver properly. If you don't know

 Let's set it.

## 2. Is the NAT setting written to iptables?
sudo iptables iptables -t nat -L
sudo systemctl restart docker.service

## 3. Is firewalld set?
 The virtual bridge of docker is docker0

firewall-cmd --permanent --zone=trusted --change-interface=docker0
firewall-cmd --reload
systemctl restart docker

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