How to restrict access to specific IPs in Docker?
Docker’s forward rules permit all external source IPs by default. To allow only a specific IP or network to access the containers, insert a negated rule at the top of the DOCKER filter chain. For example, to restrict external access such that only source IP 8.8.8.8 can access the containers, the following rule could be added:
How to see the IP of a docker container?
Docker does the port-mapping in the PREROUTING chain of the nat table. This happens before the filter rules, so –dest and –dport will see the internal IP and port of the container. To access the original destination, you can use -m conntrack –ctorigdstport.
Is the port for MySQL blocked in Docker?
Unlike the chain DOCKER it is not reset on building/starting containers. So you could add these lines to your iptables config/script for provisioning the server even before installing docker and starting the containers: Now the port for MySQL is blocked from external access (eth0) even thought docker opens the port for the world.
How to limit external connections to a docker container?
The answer seems to be in Docker’s documentation at https://docs.docker.com/articles/networking/#the-world Docker’s forward rules permit all external source IPs by default. To allow only a specific IP or network to access the containers, insert a negated rule at the top of the DOCKER filter chain.
How are the iptables rules loaded in Docker?
All of Docker’s iptables rules are added to the DOCKER chain. Do not manipulate this table manually. If you need to add rules which load before Docker’s rules, add them to the DOCKER-USER chain. These rules are loaded before any rules Docker creates automatically.
Can a docker container connect to any IP address?
By default, all external source IPs are allowed to connect to the Docker host. To allow only a specific IP or network to access the containers, insert a negated rule at the top of the DOCKER-USER filter chain. For example, the following rule restricts external access from all IP addresses except 192.168.1.1: