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ECS Bridge Plugin

Overview

The ECS Bridge plugin configures the network namespace of the container to be able to communicate with the credentials endpoint of the ECS Agent by creating a bridge (if required) and veth pair to connect the container's network namespace to the bridge. An example configuration for invoking this plugin is listed next:

{
    "type":"ecs-bridge",
    "cniVersion":"0.3.0",
    "bridge":"ecs-br0",
    "mtu":1500,
    "ipam":{
	"type":"ecs-ipam",
	"id":"test",
	"cniVersion":"0.3.0",
	"ipv4-subnet":"169.254.172.0/22",
	"ipv4-routes":[
	    {
		"dst":"169.254.172.1"
	    }
	]
    }
}

Parameters

  • bridge (string, required): the name of the bridge
  • ipam (ipam config, required): the ipam configuration to use, refer to ../ipam/README.md for more details
  • mtu (int, optional): the maximum transmission unit size for the bridge

Example

Please ensure that the environment variables needed for running any CNI plugins are appropriately configured:

  • CNI_COMMAND: Command to execute eg: ADD.
  • CNI_PATH: Plugin binary path eg: pwd/bin.
  • CNI_IFNAME: Interface name inside the container

Add:

export CNI_COMMAND=ADD && cat mynet.conf | ../bin/ecs-bridge

Del:

export CNI_COMMAND=DEL && cat mynet.conf | ../bin/ecs-bridge

mynet.conf is the configuration file for the plugin, it's the same as described in the overview above.

Testing

End-to-end Tests

The end-to-end test suite for this package makes the following assumptions:

  1. The ecs-bridge and ecs-ipam plugin executables have been built
  2. The CNI_PATH environment variable points to the location of these plugins
  3. The test is being executed with root user privileges

Since these tests invoke the the ECS Bridge plugin as if an end user such as the ECS Agent is invoking it, additional configuration variables can be set to prevent the test runner from cleaning up the artifacts generated during the test execution for debugging purposes:

  • ECS_PRESERVE_E2E_TEST_LOGS: This is set to false by default. Overriding with true preserves log files from the plugins
  • ECS_BRIDGE_PRESERVE_IPAM_DB: This is set to false by default. Overriding with true preserves the IPAM database generated by the ECS IPAM plugin

Please refer the Makefile for an example of the command line required to run end-to-end tests (under the e2e-test target).