Application Hosting on Cisco Catalyst Switches

AWS Greengrass

AWS IoT Greengrass is software that extends cloud capabilities to local devices. This enables devices to collect and analyze data closer to the source of information, react autonomously to local events, and communicate securely with each other on local networks. AWS IoT Greengrass developers can use AWS Lambda functions and prebuilt connectors to create serverless applications that are deployed to devices for local execution. More details click here .

The following section explains how to install AWS greengrass in Catalyst 9000.

Step 1: Configure AWS IoT Greengrass on AWS IoT

Complete the AWS Greengrass setup required in AWS IoT Cloud as explained here

Notes: a. After complete step 1, select Greengrass group, "settings" section and update "Default Lambda function containerization" to "No container" option.

b. Download certificates/key/config from AWS console associated to Greengrass group and root CA certificate from recommended ATS (Amazon Trust Services) location.

Step 2: Create and package Lambda function

Create and deploy a Lambda function on AWS IoT Greengrass core, follow instructions here

Step 3: Configure the Lambda function

Follow this link to configure Lambda function.

Note: a. On the "Group Specific Lambda Configuration", select "No Container (always)" on Containerization option and select "Make this function long-lived and keep it running indefinitely" on Lambda Lifecycle

Step 4: Deploy on Catalyst 9000

a. Copy Docker image usbflash1

b. Configure Greengrass Application

Code Snippet
Copyapp-hosting appid Greengrass
    app-vnic managment guest-inerface 0
        guest-ipaddress 10.195.184.1 netmask 255.255.255.0
    app-default-gateway 10.195.184.1 guest-interface 0
    app-resource docker
        runopts "entrypoint /greengrassentrypoint.sh v $(APP_DATA)/certs:/greengrass/certs $(APP_DATA)/config:/greengrass/config"
    app-resource package-profile custom
    app-resource profile custom
        cpu 5000
        memory 1000

c. Install the greengrass Docker image and activate it

Code Snippet
Copyapp-hosting install appid Greengrass pacakge usbflash1:aws_gg.tar
app-hosting activate appid Greengrass

d. If Catalyst 9000 is in corporate network behind firewall, update config.json file downloaded from AWS console with appropriate HTTP proxy details. If Catalyst 9000 is connected network with accessibility to AWS Cloud, then skip this step.

Here is sample config.json file:

Code Snippet
Copy{
"coreThing" : {
  "caPath" : "root.ca.pem",
  "certPath" : "653c7192eb.cert.pem",
  "keyPath" : "653c7192eb.private.key",
  "thingArn" : "arn:aws:iot:uswest2:591120533562:thing/ gg_apr3_2019_Core", "iotHost" :
  "a3251ha57e0fzgats.iot.uswest2.amazonaws.com", "iotMqttPort" : 443,
  "iotHttpPort" : 443,
  "ggHttpPort" : 443,
  "ggHost" : "greengrassats.iot.uswest2.amazonaws.com",
  "keepAlive" : 600,
  "networkProxy": {
    "noProxyAddresses" : "localhost,127.0.0.1,198.18.134.1,.cisco.com", "proxy" : {
      "url" : "http://proxywsa.esl.cisco.com:80" }
    }
  } ....
}

e. Copy certs and config to Greengrass container Using app-hosting data command copy root CA, Keys and Cerificate to container.

For example:

Code Snippet
Copyapp-hosting data appid greengrass copy usbflash1:653c7192eb.private.key certs/653c7192eb.private.key

f. Start Application hosting container

Code Snippet
Copyapp-hosting start appid greengrass

Step 5: Deploy subscription

In AWS IoT console, in Cloud > Select Greengrass group which is used to obtain certs/keys > Select subscriptions section and Deploy subscription.

Step 6: Test

In AWS IoT dashboard, select "Test" and subscribe to a topic "hello/world". Now you should see the messages sent from hello world lambda running on Catalyst 9000 to AWS IoT cloud on topic hello/world.

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