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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. 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. You can review these plugins in the amazon-ecs-cni-plugins GitHub repo. The following commands show that they have a similar view of the network stack and can talk to each other over the localhost interface.

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

This is handled by the ecs-bridge and ecs-ipam plugins, which are invoked next. In this example setup, you have two containers in a task behind an elastic network interface.

Software Dev Engineer Anirudh Aithal. The following diagram illustrates the different steps in this process:.

It then sets up the network namespace of the pause container by executing the previously mentioned CNI plugins. List the last three containers running on the host you launched a task with two containers and the ECS agent launched the additional container ethernwt configure the network namespace: This post is a deep dive into how task networking works with Amazon ECS.

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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 any network device shows up in the global default network namespace of the host.

The ECS agentwhich itself is running as a container, is responsible for:. If you want to learn more about how you can start using task networking for your containerized applications, see Introducing Cloud Native Networking for Amazon ECS Containers.

CNI plugins are executable files that comply with the CNI specification and configure the network connectivity of containers. The diagram above shows a typical container instance. Container instance setup Before I discuss the details of enabling task networking on container instances, look at how a typical instance looks in ECS.

Under the Hood: Task Networking for Amazon ECS | AWS Compute Blog

Before I discuss the details of enabling task networking on container instances, look aya133 how a typical instance looks in ECS. The following diagram illustrates the different steps in this process: You specify the container or its network namespace and invoke es plugin with the ADD command to add network interfaces to a container, and then the DEL command to tear them down. The ECS agentwhich itself is running as a container, is responsible for: The CNI library provides mechanisms to interpret the results from the execution of these plugins, which results in an efficient error handling in the agent.

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. You can review these plugins in the amazon-ecs-cni-plugins GitHub repo. It also starts the rest of the containers in the task so that they share their network stack of the pause container. All of this work means that you can use the new awsvpc networking mode and benefit from native networking support for your containers.

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The following commands etherney that they have a similar view of the network stack and can talk to each other over the localhost interface.

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. 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 the global default network namespace of the host.

In either case, network stacks of containers are configured via network namespaces.