I have some smart wifi devices on my network I can see from a script on my Mac. But running the same script from within a Docker container those devices are not visible.
I assume this is related to Docker for Mac's inability to connect to the host's network using --network host or network_mode: host. I also assume this issue wouldn't exist on a Linux machine but I don't have one to test on.
What is the workaround?
Edit:
Confirmed this worked fine when running inside an Ubuntu virtualbox, but I'd really not have to develop inside it.
If you start the container with network option as host, the container will share the network stack of the host. Thus any device reachable from you host should be reachable by the container.
docker run --network host ...
Adding containers to a network would allow them to communicate with each other but if you want to access other services running on host then host.docker.internal (from 18.03+). I had to do the same in a mac mini setup to access external service.
[https://docs.docker.com/docker-for-mac/networking/]
If you have to access a service on another host then you can setup an nginx server on the docker host and a proxy pass rule to direct it to the remote service.
Related
I'm running some docker containers on a server and want to access those containers on their ports after connecting to the server with WireGuard. However when I run the containers in host network mode I can't access them over WireGuard.
They can access each other via localhost. I can even redirect to them with NGINX (but I don't want to actually do this due to security reasons). I can access them on their ports via WireGuard if I run them in bridged mode.
Why can't I access them when running them in host mode? And what can I do to access them? I really want to run the docker containers in host networking mode.
Turns out it was a firewall issue. I had to allow the ip of the WireGuard in the firewall settings on the server.
I have an headless server with VirtualBox. It run multiple virtual machines. One of them is a web proxy. It redirect external access to the right VM in function of the subdomain. Those VMs are communicating between them with internal network (intnet).
I would like to add some docker container to this configuration. How could I successfully create a network shared between my docker containers and this proxy VM ?
I tried to create a bridge network with docker docker network create my_net and then connect the VM with a additional network card in 'bridged' mode.
With this config ping works but not the actual connection. It isn't impossible to display the web page into a browser.
Am I missing some configuration here ? Also, is it a good practice to connect one VM to a docker network ?
Run the containers on one of the VMs. Use a totally normal Docker setup here: create a network for inter-container communication but don't configure it, and completely ignore the container-private network details and IP addresses.
When you use the docker run -p option, that will publish a container's port on its VM's network interface(s). From that point, other VMs can call the published port using that VM's IP address, just as if it were a non-container process running on the VM. Conversely, containers should be able to make outbound calls to the other VMs without special setup.
My program is consisting of a network of ROS1 and ROS2 nodes, which are software that work with a publish/subscribe way of communication.
Assume there is 4 nodes running inside a custom network: onboard_network.
Those 4 nodes (ROS1) can only communicate together, therefore we have a bridge node (ROS1 & ROS2) that needs to be sitting on the edge on both onboard_network and host network. The reason why we need the host network is because the host is inside a VPN (Zerotier). Inside the VPN we have also our server (ROS2).
We also need the bride node to work with host network because ROS2 work with some multicast stuff that works only on host mode.
So basically, I want a docker compose file running 4 containers inside an onboard_network & a container running inside the host network. The last container needs to be seen from the containers in the onboard_network and being able to see them too. How could I do it ? Is it even possible ?
If you're running a container on the host network, its network setup is identical to a non-container process running on the host.
A container can't be set to use both host networking and Docker networking.
That means, for your network_mode: host container, it can call other containers using localhost as a hostname and their published ports: (because its network is the host's network). For your bridge-network containers, they can call the host-network container using the special hostname host.docker.internal on MacOS or Windows hosts, or on Linux they need to find some reachable IP address (this is discussed further in From inside of a Docker container, how do I connect to the localhost of the machine?.
I'm new to Docker and Containers, and I'm trying to run a simple asp.net web app in a container but running into issues. My OS is Windows 10 Home, so I have to use the Docker Toolbox, which runs on a VM that only includes a basic Linux OS. When I spin up the container, it seems to start fine, but I can't view the app on the localhost.
$ docker run -p 8342:5000 -it jwarren:project
Hosting environment: Production
Content root path: /app
Now listening on: http://*:5000
Application started. Press Ctrl+C to shut down.
$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
98cc4aed7586 jwarren:project "dotnet run" 8 minutes ago Up 8 minutes 0.0.0.0:8342->5000/tcp naughty_brattain
I've tried several different recommendations that I found on the web, but none have helped so far. However, my knowledge of networking is very limited, so maybe I'm not fully understanding what needs to be done. I've tried accessing it with the default VM machine IP and the container IP. I understand that the port forwarding does not carry over to the container. Any assistance would be great, as this project is due on Tuesday, and this is the last road block before finishing.
I found the following post that was really helpful: How to connect to a docker container from outside the host (same network) [Windows]. Following the steps below worked perfectly:
Open Oracle VM VirtualBox Manager
Select the VM used by Docker
Click Settings -> Network Adapter 1 should (default?) be "Attached
to:NAT"
Click Advanced -> Port Forwarding Add rule: Protocol TCP, Host Port
8080, Guest Port 8080 (leave Host IP and Guest IP empty)
You should now be able to browse to your container via localhost:8080 and your-internal-ip:8080.
Started up the container (Dockerfile EXPOSES 5000):
docker run -p 8080:5000 -it jwarren:project
Was able to connect with http://localhost:8080
There are few things to consider when working with a VM networking.
Virtual Box has 3 types of networking options NAT, Bridged and Host Only.
NAT would allow your VM to access internet through your internet. But won't allow your HOST machine to access the VM
Host Only network will create a network where the VM can reach the host machine and the Host can reach the VM. No internet using this network
Bridged network will allow your VM to assign another IP from your Wifi router or the main network. This IP will allow VM to have net access as well as access to other machines on the network. This will allow even the host machine to reach the IP
Now in most cases when you want to run Docker inside a VM and access that VM using the host machine you want the VM to have both NAT and Host only bridges
Now accessing your app on port 8342 needs few things checked
seliunx, firewalld, ufw are disabled on your VM (or properly configured to allow the port)
Your VM has a host only network or bridged network
iptables -S should not show REJECT rules
Some VMs come pre-configure to only allow port 22 from external network. So you should try access the app on <hostonlyip>:8342 or <bridgedip>:8342.
If you want to test if the app is up or not you can do the following
docker inspect <containerid> | grep IPA
Get the IP from this and run the command
curl http://<containerip>:5000/
This command needs to be execute inside the VM and not on your machine. If this command doesn't work then your container is not listening on 5000. Sometimes app listen to only 127.0.0.1 inside the container. This means they will work only inside the container and not outside. The app inside the container needs to listen to 0.0.0.0
If nothing works you can try an ssh tunnel approach
ssh -L 8342:127.0.0.1:8342 user#<VMIP>
And then you should be able to access the app on localhost:8342
I am wondering if is it possible to connect to an app on local host from Docker container.
I run two Docker container which are connected to each other via link option. But how can I connect one of the containers to the local host?
Yes, use docker run --network=container:<container-id>
--network='container:': reuse another container's network stack
This let you run a container sharing the same network interface (then localhost) from another container.
Alternatively, you can use the host mode to give your containers the same network ips that the host has (including localhost). docker run --network=host:
--network= 'host': use the Docker host network stack
Docs: https://docs.docker.com/engine/reference/run/#name-name
I think it is possible.
Try communicate with the host's<ip:port>
ip: useip addror something similar to get the one of eth0，not the one of docker0
port：the one you assigned to the app
To make the process easier，perhaps turn selinux and firewall down when you try.