This way every running container can be made public on the network.įor convenience, I created a script that does all of this at once. The main advantage is that the service container does not have to know about the public IP, DHCP, etc. The network container acquires an address from DHCP.įrom this point on the network container is available on the network and routes the ports to the service container.Create a network bridge from the Docker host to the container using jpetazzo's Pipework ( ).This container will have an extra network interface bridged with the host so it can acquire an IP from DHCP. Create a new 'network' container that is linked with the service container and does routing to the ports exposed by the service container.Start the 'service' container that I want to be available on the public IP.** Warning: shameless plug ** - but it will probably solve your problem. Recently I had the same problem and solved it using Network Containers. $docker_gateway should be the ip address of the docker host.As by now, the dockers are perfectly reachable from the clients in the LAN. Route add -net $docker_subnet netmask 255.255.255.0 gw $docker_gateway dev $lan_iface Notes: In that case, I opted to use a network route (I'm still experimenting) on the clients which should see the dockers.
This method is useful when the container is needed to be exposed to a public (WAN) ip address, but in a LAN scenario, when several services and dockers may coexist in the same host, the same port being used by the virtual NIC is a problem waiting to happen. In this way, the docker container is accessible from the LAN network I assume it would also work for public addresses. # run $options -p $new_ip:$port1:$port1 -p $new_ip:$port2:$port2 -p $new_ip:$port3:port3 $instance_id $command # ifconfig eth0:1 $new_ip netmask $netmask broadcast $broadcast_address (We’re doing port 5000 specifically because that’s where our Docker image is listening, Flask’s default port.Hi, I was able to workaround this by creating a virtual interface on top of the hosts's NIC. p 8080:80 would redirect traffic from port 8080 on all interfaces in the main network namespace to port 80 on the container’s external interface. To break it down explicitly: -p 5000:5000 means redirecting traffic from port 5000 on all interfaces in the main network namespace to the container’s port 5000 on its external interface. If we run docker run with -p 5000:5000, it will forward from all interfaces where the Docker daemon is running (for our purposes, the main network namespace) to the external IP address of the containter. Docker run port-forwarding (is not enough) How do we connect the two network namespaces? With Docker port-forwarding. The browser is connecting to 127.0.0.1 in the main, default network namespace.īut those are different interfaces, so no connection is made. Now it’s clear why there’s a connection refused: the server is listening on 127.0.0.1 inside the container’s network namespace. The resulting network setup looks like this: Your operating system has multiple network “interfaces”.įor example, on my computer (with output shortened for clarity): Docker runs on non-Linux OSes like macOS by running a Linux virtual machine, but the practical consequences are the same.
I’m going to assume the main OS is Linux, for simplicity of explanation. Let’s start with our first scenario: you run a server directly inside your operating system, and then connect to it.
#DOCKER IP ASSIGNMENT HOW TO#
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