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ViewsWindows docker container cannot ping host
I am running a windows docker container on a Windows Server 2016 host, running default configuration.
When running the docker container using the command:
docker run -it microsoft/windowsservercore powershell
When I run the command:
ping <hostIPAddress>
It just says that the request times out. I have checked that I can ping 8.8.8.8 and google.com etc... and even other machines on the same subnet. The only one I cannot ping is the host.
I have added '--dns ' to the 'docker run' command but this only allows me to ping the host machine via hostname and not IP.
Has anyone else seen this problem and have a solution?
3 answers
Answer question0
I found a workaround (I'm not willing to call it a solution):
Windows Container Network Drivers: create a 'transparent' network:
docker network create -d transparent trans
Attach container to this network
docker run --network=trans ...
Important: Please note, that with this network, your container needs to obtain an IP Adress from the Host Subnet and it is directly exposed to it.
maybe related (this is about access the containers from the host):
According to https://github.com/Microsoft/Virtualization-Documentation/issues/253#issuecomment-217975932 (JMesser81):
This is a known limitation in our Windows NAT implementation (WinNAT) that you cannot access the external port in a static port mapping directly from the container (NAT) host.
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In my case I have a corporate managed McAfee firewall running on my Windows host. I could not add any additional rules on the firewall, but fortunately there was a rule that allowed access from 172.16.0.0/24.
I used "docker network create -d transparent trans" and it worked as described, but I was not happy with an IP from my host network assigned to the container.
I did the following:
- docker network create --driver=nat --subnet=172.16.0.0/24 br0
- Added --network=br0 to my docker run command
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Hoping this might help somebody.
On Windows 10 when hosting a Linux container on 0.0.0.0:5057 I was able to ping my server from my Windows host (powershell) using the IP address of the vEthernet (Default Switch) NIC found in Control Panel>All Control Panel Items>Network Connections:
