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Docker Can't Access Local Port

Had an issue with Prometheus in a docker compose container unable to access the node_exporter port (9100)

It turns out the firewall was blocking the docker IP range...

this fixed it: sudo ufw allow from 172.0.0.0/8 to any port 9100

OR BETTER, since I ran into problems again:

sudo ufw allow from 172.0.0.0/8 to any