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To fix the Docker and UFW security flaw without disabling iptables
...It requires disabling docker's iptables function first, but this also means that we give up docker's network management function. This causes containers will not be able to access the external network. It is also mentioned in some articles that you can manually add some rules in the UFW configuration file, such as -A POSTROUTING! -o docker0 -s 172.17.0.0/16 -j MASQUERADE. But this only allows containers that belong to network 172.17.0.0/16 can access outside. If we create a new docker network, we must manually add similar iptables rules for the new network.
SoupToNuts is a repository of technical articles and example software covering Postfix, OpenSSH, C and C++, Live Linux CD, MySQL, SQLite, Berkeley DB, Bash and System Administration.