Docker DNS is not working (edit: fixed by stopping firewalld)

[dscottboggs]

Hello there, I have been a Manjaro user on desktop and server for a couple years now and this is the first time I've needed to ask for help, so thank you for that

Currently, my docker containers don't have access to DNS services. For example:

~ >>> curl https://httpbin.org/user-agent                                                                                                                             
{
  "user-agent": "curl/7.67.0"
}
~ >>> docker run -it archlinux/base bash                                                                                                                           [1]
[root@9b8d1aa0da32 /]# curl https://httpbin.org/user-agent
curl: (6) Could not resolve host: httpbin.org
[root@9b8d1aa0da32 /]# cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 9.9.9.9
[root@c2c63431e25a /]# exit
exit
~ >>> cat /etc/resolv.conf                                                                                                                                            
# Generated by NetworkManager
nameserver 9.9.9.9

...why? How do I fix this? But more importantly, why?

[dscottboggs]

I just thought to check and I am able to ping 9.9.9.9 from inside the container. However, predictably, nc -z 9.9.9.9 53 fails (that is, I can't reach the IP on port 53).

[dscottboggs]

The problem seems to have cleared up by running

sudo systemctl stop firewalld
sudo systemctl restart docker

Does anyone have some advice on a more permanent fix?