Is it possible to run a VPN client inside a docker container?
And if it is, then will it be possible to communicate between the host and the container?
An example of the architecture -
Host <-> Container <-> VPN
172.0.0.1 172.0.0.3 & 222.104.0.105 222.106.3.5
Thanks in advance!
Configuration example of such scenario can be found here: https://greenfrognest.com/LMDSVPN.php
It is based on a specific VPN docker container client (dperson/openvpn-client), but as far I can see it can be configured using any VPN provider.
Associated YouTube video with above instructions can be found here
Yes it is possible to run openvpn or such a container, you will find many in the docker hub, look at http://registry.hub.docker.com and if you docker run --net=host it will communicate with the host
Related
I am quite new to the docker topics and I have a question of connecting container services with traditional ones.
Currently I am thinking of replacing an traditional grafana installation (directly on a linux server) with a grafana docker container.
In grafana I have to connect to different data sources like a mysql instance, a Winsows SQL Database and so on. So grafana is doing a pull of data. All these data sources reside (and will still reside) on other hosts and they are not containers.
So how can I implement that my container is able to communicate with this data sources? Is it possible by default or do I have to implement a special kind of network? I saw that there is an option called macvlan...is that the correct way?
BR
Jan
This should work out of the box, as far as I understand. At least, I'm using Grafana inside a docker container and it works perfectly.
You can test a connectivity from inside your docker container to some external resource by opening a container shell like this:
docker exec -it <container ID> /bin/bash
And then
root#a9cbebfc4564:/# curl google.com
Or
root#a9cbebfc4564:/# ping <bla-bla>
Commands above depend on a docker image environment (like OS or installed software), but this can be solved in a same was as you can do on a regular Unix env
P.S. I encountered a docker2host connection issue once, but it was due to incorrect firewall configuration on a host side.
Since you are replacing a traditional installation, you can start with host networking. This mode give you same connectivity experience as installing on the host. A quick start is as simple as:
docker run --network host grafana/grafana
Notice there's no need to --publish or --publish-all ports as the Grafana container now share the host network.
Good morning!
Im using check point mobile to connect to my client VPN, and I have 2 containers in docker: mysql and karaf both sharing the network I created using the command docker network create --subnet=vpnAddress mynet
I used the command --network=mynet when running the containers.
Until here its all ok, I can connect via putty ssh to karaf, install the kar and all bundles are ok.
But when calling the services I realize that the container is not connected to the VPN, even so that I created a network with the VPN address. I need to be connected to the VPN in order to call the services.
Im connected externally(outside docker) to the VPN using the check point mobile, but I need docker to add/connect to the VPN.
Im using windows 10 (using docker with linux containers), I tried to go to C:\ProgramData\DockerDesktop\tmp-d4w and edit the file host.docker.internal too and change the IP to my VPN address, but none works.
I searched a lot, and I saw people talking about docker vpn images such as nordVpn or openVpn, but I cant use that.
I have been told I need to add the vpn network to docker, But im green at networking and I dont know how to do it, and what I did didn't work.
Hope you can help me. thanks!
edit: in docker engine i added the "bip": "vpnAddress/24"
I realize now that network bridge uses the VPN address now, tried to --network=bridge in both karaf and mysql container, but now karaf cant connect to mysql, but if I use the default docker create network mynet and run the 2 container using that network it works, but no luck with the VPN this way.
I haven't used Docker on Windows, but a quick look at some VPN containers shows that, in *nix at least, they use --device /dev/net/tun --cap-add=NET_ADMIN to expose the VPN "device" to the container. Other containers then use docker networking or links to connect to this VPN container - so looking at how the VPN containers do it might be helpful.
One suggestion for Mac seems to be using extra_hosts like so:
extra_hosts:
- "vpn.company.com:172.21.1.1"
You might be able to hack it with something like that. (or physically adding 172.21.1.1 vpn.company.com to /etc/hosts in the container). Also, checking for IP address conflicts between the Docker daemon and your host machine.
Windows docs seem to suggest they don't support network interfaces as "devices", so you probably need to either create a very specific docker network or modify host networking settings, starting with getting Docker daemon to recognize the VPN network.
See the Configure Advanced Networking section for some examples. I'd try creating a network associated with the VPN device first, then look into flags like --subnet and --gateway.
docker network create -d transparent \
-o com.docker.network.windowsshim.interface="Ethernet 2" TransparentNet2
This creates a network with a particular subnet and gateway, then runs a container with a statically-assigned IP on that network.
C:\> docker network create -d transparent \
--subnet=10.123.174.0/23 \
--gateway=10.123.174.1 MyTransparentNet
C:\> docker run -it --network=MyTransparentNet \
--ip=10.123.174.105 windowsservercore cmd
Good luck!
we have two machine…one is windows machine and another in Linux machine. My application is running under Docker Container at Linux machine. our data base is running at Windows machine.our application need to get data from windows machine DB.
As we have given proper data source detail like IP, username ,password in our application. it works when we do not use docker container but when we use docker container it do not work.
Can anyone help me out to get this solution that how we can connect outside DB from Docker enabled application as we are totally new guys in term of Docker.
Any help would be much appreciated.
Container's default network is "bridge",you should choose macvlan or host network.
method 1
docker run -d --net host image
this container will share your host IP address and will be able to access your database.
method 2
Use docker network create command to create a macvlan network,refrence here
then create your container by
docker run -d --net YOURNETWORK image
The container will have an IP address which is the same gateway with its host.
There are a lot of issues that could be affecting your container's ability to communicate with your database. In the future you should compose your question with as much detail as possible. To correctly answer this you will, at a minimum, need to include the following details:
Linux distribution name & version
Docker version
Output of docker inspect from the container
Linux firewall configuration
Network configuration
Is your Windows machine running on the same local network / subnet as your Linux machine? If so, please provide information about the subnet, as the default bridge set up by Docker may restrict access to local resources, whereas those over a wide area network would still be accessible.
You can try passing the --network=host option to your docker run command like so: docker run --network=host <image name>. Doing so eliminates the need to specify port mappings in your run command, as they are ignored when using the host's network.
Please edit your question and include the above requested details to get a complete answer.
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.
Now I have two laptops (not necessary in one local network) and docker installed on both of them. My goal is to run docker daemon on the first laptop and be able to execute commands using docker client on the second laptop. What should I do to achieve the goal?
Follow the public API? Docker Engine API
Setup Docker to listen for TCP connections on a specified port and protect that port with TLS. You must setup some environment variables so the Docker client communicates with the Docker daemon.
Here's the relevant documentation:
https://docs.docker.com/engine/admin/
https://docs.docker.com/engine/security/https/
Enjoy, and have fun.