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Ruben Gromov
Ruben Gromov

Greengrass Nucleus Download: Tips and Tricks for Deploying and Managing Greengrass Components and Applications


The Greengrass nucleus component (aws.greengrass.Nucleus) is a mandatory component and the minimum requirement to run the AWS IoT Greengrass Core software on a device. You can configure this component to customize and update your AWS IoT Greengrass Core software remotely. Deploy this component to configure settings such as proxy, device role, and AWS IoT thing configuration on your core devices.


When you deploy a component, AWS IoT Greengrass installs the latest supported versions of all of that component's dependencies. Because of this, new patch versions of AWS-provided public components might be automatically deployed to your core devices if you add new devices to a thing group, or you update the deployment that targets those devices. Some automatic updates, such as a nucleus update, can cause your devices to restart unexpectedly.




download greengrass nucleus



You can download an installer that sets up the Greengrass nucleus component on your device. This installer sets up your device as a Greengrass core device. There are two types of installations that you can perform: a quick installation that creates required AWS resources for you, or a manual installation where you create the AWS resources yourself. For more information, see Install the AWS IoT Greengrass Core software.


(Optional) You can enable the Greengrass nucleus to interpolate component recipe variables in component configurations and merge configuration updates. We recommend that you set this option to true so that the core device can run Greengrass components that use recipe variables in their configurations.


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(Optional) The maximum total size of log files (in kilobytes) for each component, including the Greengrass nucleus. The Greengrass nucleus' log files also include logs from plugin components. After a component's total size of log files exceeds this maximum size, the AWS IoT Greengrass Core software deletes that component's oldest log files.


This parameter is equivalent to the log manager component's disk space limit parameter (diskSpaceLimit), which you can specify for the Greengrass nucleus (system) and each component. The AWS IoT Greengrass Core software uses the minimum of the two values as the maximum total log size for the Greengrass nucleus and each component.


Fixes an issue where a deployment fails when the local recipe metadata region doesn't match the Greengrass nucleus launch region. The Greengrass nucleus now renegotiates with the cloud when this happens.


Updates the Greengrass nucleus to report a deployment health status response that includes detailed error codes when there is a problem deploying components to a core device. For more information, see Detailed deployment error codes.


Updates the Greengrass nucleus to report a component health status response that includes detailed error codes when a component enters the BROKEN or ERRORED state. For more information, see Detailed component status codes.


Adds support for client certificates signed by a custom certificate authority (CA), where the CA isn't registered with AWS IoT. To use this feature, you can set the new greengrassDataPlaneEndpoint configuration option to iotdata. For more information, see Use a device certificate signed by a private CA.


Updates how the Greengrass nucleus parses Boolean installer arguments, so you can specify a Boolean argument without a Boolean value to specify a true value. For example, you can now specify --provision instead of --provision true to install with automatic resource provisioning.


Changes thing group removal behavior for core devices whose AWS IoT policy doesn't grant the greengrass:ListThingGroupsForCoreDevice permission. With this version, the deployment continues, logs a warning, and doesn't remove components when you remove the core device from a thing group. For more information, see Deploy AWS IoT Greengrass components to devices.


Fixes an issue with system environment variables that the Greengrass nucleus makes available to Greengrass component processes. You can now restart a component for it to use the latest system environment variables.


As a result of this change, a core device's AWS IoT policy must have the greengrass:ListThingGroupsForCoreDevice permission. If you used the AWS IoT Greengrass Core software installer to provision resources, the default AWS IoT policy allows greengrass:*, which includes this permission. For more information, see Device authentication and authorization for AWS IoT Greengrass.


Removes the iot:DescribeCertificate permission from the default token exchange role that the Greengrass nucleus creates when you install the AWS IoT Greengrass Core software with automatic provisioning. This permission isn't used by the Greengrass nucleus.


Adds support for provisioning plugins. You can specify a JAR file to run during installation to provision required AWS resources for a Greengrass core device. The Greengrass nucleus includes an interface that you can implement to develop custom provisioning plugins. For more information, see Install AWS IoT Greengrass Core software with custom resource provisioning.


Updates the nucleus loader symlink to point to the component store in the Greengrass root folder during installation. This update enables you to delete the JAR file and other nucleus artifacts that you download when you install the AWS IoT Greengrass Core software.


To use this feature, a core device's AWS IoT policy must allow the greengrass:GetDeploymentConfiguration permission. If you used the AWS IoT Greengrass Core software installer to provision resources, your core device's AWS IoT policy allows greengrass:*, which includes this permission. For more information, see Device authentication and authorization for AWS IoT Greengrass.


Fix an issue that caused the HOME environment variable to be set to the /greengrass/v2/work directory for Lambda components or for components that run as root. The HOME variable is now correctly set to the home directory for the user that runs the component.


Enables HTTPS traffic over port 443. You can use the new greengrassDataPlanePort configuration parameter for version 2.0.4 of the nucleus component to configure HTTPS communication to travel over port 443 instead of the default port 8443. For more information, see Configure HTTPS over port 443.


Greengrass core devices use an IAM service role, called the token exchange role, to authorize calls to AWS services. The device uses the AWS IoT credentials provider to get temporary AWS credentials for this role, which allows the device to interact with AWS IoT, send logs to Amazon CloudWatch Logs, and download custom component artifacts from Amazon S3. For more information, see Authorize core devices to interact with AWS services.


Earlier, you downloaded your device's certificate to your development computer. In this section, you copy the certificate to your core device to set up the device with the certificates that it uses to connect to AWS IoT. You also download the Amazon root certificate authority (CA) certificate. If you use an HSM, you also import the certificate file into the HSM in this section.


Import the thing certificate file, /greengrass-v2-certs/device.pem.crt, into the HSM. Check the documentation for your HSM to learn how to import certificates into it. Import the certificate using the same token, slot ID, user PIN, object label, and object ID (if your HSM uses one) where you generated the private key in the HSM earlier.


On Windows devices, the LocalSystem account runs the Greengrass nucleus, and you must use the PsExec utility to store the default user information in the LocalSystem account. Using the Credential Manager application stores this information in the Windows account of the currently logged on user, instead of the LocalSystem account.


If you install a version of the Greengrass nucleus earlier than v2.4.0, don't remove this folder after you install the AWS IoT Greengrass Core software. The AWS IoT Greengrass Core software uses the files in this folder to run.


If you are running AWS IoT Greengrass on a device with limited memory, you can control the amount of memory that AWS IoT Greengrass Core software uses. To control memory allocation, you can set JVM heap size options in the jvmOptions configuration parameter in your nucleus component. For more information, see Control memory allocation with JVM options.


In this configuration file, you can customize other nucleus configuration options such as the ports and network proxy to use, as shown in the following example. For more information, see Greengrass nucleus configuration.


To enable the AWS IoT Greengrass Core software to use the private key and certificate in the HSM, install the PKCS#11 provider component when you install the AWS IoT Greengrass Core software. The PKCS#11 provider component is a plugin that you can configure during installation. You can download the latest version of the PKCS#11 provider component from the following location:


sudo -E java -Droot="/greengrass/v2" -Dlog.store=FILE -jar ./GreengrassCore/lib/Greengrass.jar --aws-region eu-west-1 --thing-name GreengrassQuickStartCore-1773dec1ad2 --thing-group-name GreengrassQuickStartGroup --component-default-user ggc_user:ggc_group --provision true --setup-system-service true --deploy-dev-tools true


All seems to be done, my core device was created in aws console and status is "Healty" but on my raspberry the folder /greengrass/v2 does not exist and i cannot see logs etc.If i read documentation for troubleshooting device issues everyone report /greengrass/v2/logs/ as a log folder but on my device greengrass folder does not exist.


Now build a Lambda function and deploy it to the new Greengrass Core instance. You can find example local Lambda functions in the aws-greengrass-lambda-functions GitHub repository. This example will use the Hello World Python 3 function from that repo.


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