Set the ip of the docker container

[adixia]

Hello,
I would like to create a docker container from a dockerfile and set its IP, e.g 1.1.1.1, on a custom network called mynetwork, like this:
docker run --net mynetwork --ip '1.1.1.1' -it mycontainer
is it possible with FluentDocker?

Thank you for the support
Alessandro

[mariotoffia]

Hi, I've added support for ipv4 and v6 for both run and create commands. I've also added support for the explicit ip setting on container in the fluent API. Can you checkout the code and have a go to reproduce your specific case? Can you submit that as a unit test as a PR?

I've added test but have not the time to setup a proper network as of now to test this. But along the lines of.

        var cmd = _docker.Run("postgres:9.6-alpine", new ContainerCreateParams
        {
          PortMappings = new[] {"40001:5432"},
          Environment = new[] {"POSTGRES_PASSWORD=mysecretpassword"},
          Network = "mynetwork",
          Ipv4 = "1.1.1.1"
        }, _certificates);
        
        var container = cmd.Data;
        var insp = _docker.InspectContainer(container, _certificates);
        var ip = insp.Data.NetworkSettings.IPAddress;
        Assert.AreEqual("1.1.1.1", ip);

The above example will create a new container using network mynetwork and set the static ip of 1.1.1.1. The fluent API would look something like this:

      using (var nw = Fd.UseNetwork("mynetwork").Build())
      {
        using (
          var container =
            Fd.UseContainer()
              .WithName("mycontainer")
              .UseImage("postgres:9.6-alpine")
              .WithEnvironment("POSTGRES_PASSWORD=mysecretpassword")
              .ExposePort(5432)
              .UseNetwork(nw)
              .UseIpV4("1.1.1.1")              
              .WaitForPort("5432/tcp", 30000 /*30s*/)
              .Build()
              .Start())
        {
          var ip = container.GetConfiguration().NetworkSettings.IPAddress;
          Assert.AreEqual("1.1.1.1", ip);
        }
      }

Cheers,
Mario

[adixia]

Hi Mario,
I am sorry but I am a junior Developer and I don't know how to do the unit Tests correctly...

Anyway I created my own network and then I tried to set the ip of the newer container to one in that network via fluent API, but it raises me this exception :

user specified IP address is supported on user defined networks only Error: failed to start containers....

I think this happens because the "--ip" arguments has to be added after the name of the custom network, and I don't know if this is possible with the API... Thank you for the support.

[mariotoffia]

Thanks @adixia ! Can you checkout and try again? --ip or --ip6 are now emitted after the --network.

Cheers,
Mario

[adixia]

Hi Mario , still receiving
user specified IP address is supported on user defined networks only...
I think that Docker doesn't understand that the IP I passed it's for the new container when it uses the custom network.

Thanks

[adixia]

Hi Mario,
I've inspected deeper this issue and i found that the problem is the parameters order in the command.
The proper command should be:
'docker run --net mynetwork --ip '1.1.1.1' -it mycontainer'.
the --ip flag has to be added as the next command after the name of the custom network, otherwise it doesn't work.
Sorry for bothering you, I hope you can help me.

Have a nice day.

[mariotoffia]

neat, thanks I'll update and release tomorrow.
cheers
mario

[mariotoffia]

I'll release the new version 2.6.6 now (it will be available in a few hours - depending on nuget indexing). I've also created two unit test to ensure that it is really working:

This is the fluent test.

      using (var nw = Fd.UseNetwork("unit-test-nw")
                        .UseSubnet("10.18.0.0/16").Build())
      {
        using (
          var container =
            Fd.UseContainer()
              .WithName("mycontainer")
              .UseImage("postgres:9.6-alpine")
              .WithEnvironment("POSTGRES_PASSWORD=mysecretpassword")
              .ExposePort(5432)
              .UseNetwork(nw)
              .UseIpV4("10.18.0.22")              
              .WaitForPort("5432/tcp", 30000 /*30s*/)
              .Build()
              .Start())
        {
          var ip = container.GetConfiguration().NetworkSettings.Networks["unit-test-nw"].IPAddress;
          Assert.AreEqual("10.18.0.22", ip);
        }
      }

… and this is the command version of the same test...

        var created = _docker.NetworkCreate("unit-test-nw", new NetworkCreateParams
        {
          Subnet  = new [] {"10.18.0.0/16"}
        }, _certificates);
        
        Assert.IsTrue(created.Success);
        id = created.Data[0];

        var cmd = _docker.Run("postgres:9.6-alpine", new ContainerCreateParams
        {
          PortMappings = new[] {"40001:5432"},
          Environment = new[] {"POSTGRES_PASSWORD=mysecretpassword"},
          Network = "unit-test-nw",
          Ipv4 = "10.18.0.22"
        }, _certificates);
        
        Assert.IsTrue(cmd.Success);
        container = cmd.Data;

        var insp = _docker.InspectContainer(container, _certificates);
        Assert.IsTrue(insp.Success);

        var ip = insp.Data.NetworkSettings.Networks["unit-test-nw"].IPAddress;
        Assert.AreEqual("10.18.0.22", ip);

Cheers,
Mario