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Container instance setup Before I discuss the details of enabling task networking on container instances, look at how a typical instance looks in ECS. This is handled by the ecs-bridge and ecs-ipam plugins, which are invoked next. This means that all containers in a task are addressable by the IP addresses of the elastic network interface, and they can communicate with each other over the localhost interface. The ECS agent , which itself is running as a container, is responsible for: You specify the container or its network namespace and invoke the plugin with the ADD command to add network interfaces to a container, and then the DEL command to tear them down.

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This means that all containers in a task are addressable by the IP addresses of the elastic network interface, and they can communicate with each other over the localhost interface. Software Dev Engineer Anirudh Aithal. Container instance setup Before I discuss the details of enabling task networking on container instances, look at how a typical instance looks in ECS.

For example, the reference bridge plugin adds all containers on the same host into a bridge that resides in the host network namespace.

The ECS agentwhich itself is running as a container, is responsible for: All of this work means that you can use the new awsvpc networking mode and benefit from native networking support etherndt your containers. In this ethegnet setup, you have two containers in a task behind an elastic network interface.

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Before I discuss the details of enabling task networking on container instances, look at how a typical instance looks in ECS.

If you want to learn more about how you can start using task networking for your containerized applications, see Introducing Cloud Native Ethrenet for Amazon ECS Containers. The following diagram illustrates the different steps in this process:.

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This is handled by the ecs-bridge and ecs-ipam plugins, which are invoked next. It also starts the rest of the containers in the task so that they share their network stack of the pause container.

In either case, network stacks of containers are configured via network namespaces. The following commands show that they have a similar view of the network stack and can talk to each other over the localhost interface.

It then sets up the network namespace of the pause container by executing the previously mentioned CNI plugins.

Invoking CNI plugins from the ECS agent When ECS attaches an elastic network interface to the instance and sends the message to the agent to provision the elastic network interface for containers in a task, the elastic network interface as with etnernet network device shows up in the global default network namespace of the host.

This post is a deep dive into how task networking works with Amazon ECS. The following diagram illustrates the different steps in this process: List the last three containers running on the host you launched a task with two containers and the ECS agent launched the additional container to configure the network namespace: The CNI project defines a specification for the plugins and provides a library for interacting with plugins, thus providing a consistent, reliable, and simple interface with which to interact with the plugins.

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You specify the container or its network namespace and invoke the plugin with the ADD command to add network interfaces to a container, and then the DEL command to tear them down. The diagram above shows a typical container instance. CNI plugins are executable files that comply with the CNI specification and configure the network connectivity of containers. When ECS attaches an elastic network interface to the instance and sends the message to the agent to provision the elastic network interface for containers in a task, the elastic network interface as with any network device shows up in ethrnet global default network namespace of the host.

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The CNI library provides mechanisms to interpret the results from the execution of these plugins, which results in an efficient error handling ecz the agent. The ECS agentwhich itself is running as a container, is responsible for:.

You can review these plugins in the amazon-ecs-cni-plugins GitHub repo.