Nexus Repository Google Cloud Storage Blobstore

This project adds Google Cloud Object Storage backed blobstores to Sonatype Nexus Repository 3 and later. It allows Nexus Repository to store the components and assets in Google Cloud instead of a local filesystem.

This plugin also uses Google Firestore in Datastore mode to store some metadata about the blobstore. The plugin prioritizes using Small Operations, which have no financial cost, but do use some limited paid operations (read, write, delete) in a cost effective manner.

Which Version do I use?

For the best experience, you should upgrade your Nexus Repository Manager and Google Cloud Blobstore plugin to the latest versions.

1. Navigate to https://search.maven.org/artifact/org.sonatype.nexus.plugins/nexus-blobstore-google-cloud
2. Select the version that matches your Nexus Repository Manager version. Example: 0.39 of the plugin is intended for Repository Manager 3.39, 0.38 for 3.38, etc.
3. Download the corresponding kar archive.

Deploying the Plugin

Google Cloud Services and IAM Roles

This plugin uses the following Google Cloud Platform services:

• Google Cloud Storage - for storing the content blobs
• Google Cloud Firestore in Datastore mode - for storing blobstore metadata

Firestore usage is exclusively in Datastore mode; you must configure the project for your Repository Manager deployment to use "Firestore in Datastore mode".

To use this plugin (or execute the integration tests), you will need a service account with the following scopes:

• https://www.googleapis.com/auth/cloud-platform
• https://www.googleapis.com/auth/compute.readonly
• https://www.googleapis.com/auth/devstorage.read_write
• https://www.googleapis.com/auth/datastore

Optionally, add the following for Cloud Logging:

• https://www.googleapis.com/auth/logging.write

The blobstore will create the storage bucket with the 'Multi-Regional' storage class.

Google Cloud Storage Authentication

Per the Google Cloud documentation:

1. Generate a JSON Service Account key
2. Store this file on the filesystem with appropriate permissions for the user running Nexus to read it.
3. (optional, but recommended) Set the GOOGLE_APPLICATION_CREDENTIALS environment variable for the user running Nexus:

export GOOGLE_APPLICATION_CREDENTIALS=/path/to/my/key.json

Installing

After downloading the kar from Maven Central (links above), copy the kar file to the deploy directory in your Nexus Repository Manager install:

cp nexus-blobstore-google-cloud-*-bundle.kar /path/to/your/nxrm3/install/deploy

Configuration

A restart of Nexus Repository Manager is required to complete the installation process.

Log in as admin and create a new blobstore, selecting 'Google Cloud Storage' as the type.

If you did not set the environment variable in Step 3 above, specify the absolute path to the JSON Service Account key file.

Contributing to Plugin Development

Contribution Guidelines

Go read our contribution guidelines to get a bit more familiar with how we would like things to flow.

Requirements

• Apache Maven 3.3.3+
• Java 8+
• Network access to https://repository.sonatype.org/content/groups/sonatype-public-grid

Also, there is a good amount of information available at Bundle Development Overview

Building from Source

To build the project and generate the bundle use Maven:

mvn clean package

Optional: review the additional documentation to configure and run integration tests.

A docker-compose file is provided to ease setting up a local NXRM instance to test.

1. docker swarm init
2. docker volume create nexus3-data
3. docker secret create google_application_credentials /path/to/your/google/iam/key.json
4. docker-compose up

You can also use the docker-compose file with docker service, like so:

docker stack deploy -c docker-compose.yml sonatype

(Using docker stack assumes you've built the container with docker build -t nexus3-google . or run docker-compose up at least once).

Last manual option: you can install the local development build in any NXRM install with:

cp target/*-bundle.kar /path/to/your/nxrm3/install/deploy

The Fine Print

It is worth noting that this is NOT SUPPORTED by Sonatype, and is a contribution of ours to the open source community (read: you!)

Remember:

• Use this contribution at the risk tolerance that you have
• Do NOT file Sonatype support tickets related to Google Cloud support
• DO file issues here on GitHub, so that the community can pitch in

Phew, that was easier than I thought. Last but not least of all:

Have fun creating and using this plugin and the Nexus platform, we are glad to have you here!

Getting help

Looking to contribute to our code but need some help? There's a few ways to get information:

• Chat with us on Gitter
• Check out the Nexus3 tag on Stack Overflow
• Check out the Nexus Repository User List