First, you’ll need to find the ID or name of the container you want to get the information for, which you can do with: docker ps If you just want the IP address though, it’s pretty simple to get from the host OS. However, you can also just launch the container in both the default and user-defined networks, so it’s not a problem if you choose to make the container visible to others. All containers in the default network can talk to each other, but once it’s removed and placed in a user-defined network, that ability is disabled. The other downside is that because user-defined networks provide better isolation, they also disallow you to access containers across networks with their private IP address. The primary issue is that containers in user-defined networks will be exposed to each other’s ports, regardless of if they’re published, but you can set up multiple networks, so this isn’t usually an issue. There’s a lot of upside to using bridges, and it’s recommended over the legacy -link option, which works on the default network. docker network create exampleĭocker run -net example -name nginx -d nginxĭocker network connect example -alias mongohost mongodb You can then access the other containers using the alias as a hostname for example, the NGINX container here can access the MongoDB instance with the connection string mongodb://mongohost:27017. You can create new networks, run containers in those networks, and connect existing containers to the network. For communication between containers, Docker provides a solution through user-defined bridge networks, which you probably should be using if you have multiple containers talking to each other.Ĭontainers added to non-default networks will be able to access each other through their alias, which will resolve to the private IP automatically. However, IP addresses are ephemeral, and can break easily when containers are stopped and started. This is the primary use case of accessing a container directly through its IP address, but you should probably still just bind a port (you can keep it closed from the internet in your firewall). You can also use this address to communicate from the host OS if you don’t want to bind a port. This can be turned off for true isolation, but it isn’t by default. Containers launched by default will be placed in the default “bridge network,” and are allowed to communicate with other containers directly, provided you have their private IP address. Consider Using a User-Defined Bridgeĭocker networking is a little complicated. But, to communicate, you’ll often need to know each container’s IP address, which you can find with a few commands. Sorry for being not able to guide you through in detail, but hopefully these hints will help you.Docker containers aren’t just about isolation-they’re often used to manage processes that still need to talk to each other directly.

So in case, you may just need a container to be reachable for other systems and you can’t change the ip address, I would think of a little proxy, apache, nginx, etc to do the redirection for you. Then you may create a subnet with the desired ip addresses and so and so forth. The main idea is: You create a virtual network over your LAN with the docker commands network … It wouldn’t make much sense to tell you in brief, what needs to be done, as this may throw up much more questions than answers. So, please have a read about these features HERE! Actually, the doing is no rocket-science, but you have to understand these features first, before you can make use of it. This is not a five minutes task to solve. The error message tells you, that you are not using the networking features of Docker, yet. Well, the issue becomes more complex the longer we discuss it. Sorry for being not a FTE of Docker support

Get docker ip address