Example of using the Network config class when creating a container

[SeanFarrow]

It would be good to have an example of using the NetworkConfig to show how to add a container to a created network as this is something I'm struggling with.

[danielgamajpa]

I did the following:

CreateContainerParameters create = new CreateContainerParameters();

create.HostConfig = new HostConfig();
create.HostConfig.NetworkMode = "NetworkNameCreatedByYou";

[SeanFarrow]

Thanks, I’ll try that!

From: Daniel Gama [email protected] Sent: 13 August 2018 21:43 To: Microsoft/Docker.DotNet [email protected] Cc: Sean Farrow [email protected]; Author [email protected] Subject: Re: [Microsoft/Docker.DotNet] Example of using the Network config class when creating a container (#331)

I did the following:

CreateContainerParameters create = new CreateContainerParameters();

create.HostConfig = new HostConfig();

create.HostConfig.NetworkMode = "NetworkNameCreatedByYou";

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[darkguy2008]

Hello! I have a question:

In Docker Compose you can specify multiple networks for a container to join to. Here, it seems we can just set only one? Or is NetworkMode a comma-separated list of networks to join to?

Thanks!

[Stadzior]

@darkguy2008 good question. I'm also waiting for the answer.

[HofmeisterAn]

Simply add your network to NetworkingConfig and assign it to CreateContainerParameters. EndpointsConfig receives a dictionary with the network name as key and and instance of EndpointSettings as value Set EndpointSettings.NetworkID too.

[Stadzior]

@HofmeisterAn I've done something like this basing on your suggestion:

    var parameters = new CreateContainerParameters
    {
        Name = $"incoming.api-{fileName}",
        Image = "incoming.api:latest",
        HostConfig = new HostConfig
        {
            AutoRemove = true
        },
        NetworkingConfig = new NetworkingConfig
        {
            EndpointsConfig = new Dictionary<string, EndpointSettings>
            {
                {"eltororojo_incoming-api-network", new EndpointSettings()},
                {"eltororojo_itemdb-network", new EndpointSettings()}
            }
        }
    };

I'm getting the following error when I'm trying to assign container to multiple networks on creation:

Unhandled exception. Docker.DotNet.DockerApiException: Docker API responded with status code=BadRequest, response={"message":"Container cannot be connected to network endpoints: eltororojo_incoming-api-network, eltororojo_itemdb-network"}

I've found the possible cause in the following thread on SO: https://stackoverflow.com/questions/60301221/docker-container-cannot-be-connected-to-network-endpoints What is the common practise in such scenario? Should I connect container to only one network and then after it's creation connect to the rest with e.g. exec?

[HofmeisterAn]

You're missing the NetworkID as mentioned above. It will be something like:

_ = new KeyValuePair<string, EndpointSettings>("18097689-b678-419a-863e-f0eefb1864cc", new EndpointSettings { NetworkID = "97bbb933b398b9ee8492007112b46063c1b6c4749885dca56ad9f4a8cf2db9e4" });

Notice the Name and Id property of docker inspect:

[
  {
    "Name":"18097689-b678-419a-863e-f0eefb1864cc",
    "Id":"97bbb933b398b9ee8492007112b46063c1b6c4749885dca56ad9f4a8cf2db9e4",
    "Created":"2022-12-05T13:49:13.684424004Z",
    "Scope":"local",
    "Driver":"bridge",
    "EnableIPv6":false,
    "IPAM":{
      "Driver":"default",
      "Options":null,
      "Config":[
        {
          "Subnet":"172.18.0.0/16",
          "Gateway":"172.18.0.1"
        }
      ]
    },
    "Internal":false,
    "Attachable":false,
    "Ingress":false,
    "ConfigFrom":{
      "Network":""
    },
    "ConfigOnly":false,
    "Containers":{
      
    },
    "Options":{
      
    },
    "Labels":{
      "org.testcontainers":"true",
      "org.testcontainers.lang":"dotnet",
      "org.testcontainers.resource-reaper-session":"c2b489f7-1ff1-4132-b1bd-ee63b3e341b6",
      "org.testcontainers.version":"2.3.0+a02e1a405f4d5b47dbb291c89c1c1472e3c1a1ff"
    }
  }
]