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Create a Network and Attach a Container

A 5-step recipe with Docker. We can help you get access.

Recipe · 5 steps

Create a Network and Attach a Container

with Docker

Create a user-defined network and attach a new container to it under an alias.

  1. Create the user-defined network. Unlike the default bridge, a user-defined network gives attached containers automatic DNS resolution of each other by name and alias.
  2. Create the container that will join the network. It is created but not yet started, so the network attachment can be made before the workload comes up.
  3. Attach the container to the network under a DNS alias, so peers can resolve it by that alias rather than by container name alone.
  4. Start the container now that it is attached, so it comes up already resolvable on the network.
  5. Inspect the network in verbose mode to confirm the container appears in its attached container list with an allocated IP address.
What you'll need to have ready
  • networkName: Name of the user-defined network to create (e.g. "app_net").
  • driver: Network driver to use — "bridge" for single host, "overlay" for swarm.
  • image: Image to create the container from. It must already be present locally.
  • containerName: Name to assign to the created container.
  • networkAlias: DNS alias other containers on the network will use to reach this one.
  • internal: Restrict external access to the network.
For your developer

Arazzo workflow docker:provision-network-and-attach, 5 operations: NetworkCreate → ContainerCreate → NetworkConnect → ContainerStart → NetworkInspect. Specs on APIs.io.

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