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Posted on • Edited on • Originally published at burakberk.dev

Sonatype Nexus Usage 101 | Best Practices & Example Use Cases

#nexus #registry #sonatype #repository

Overview

In my previous blog post, we embarked on a journey to set up Sonatype Nexus with an Nginx reverse proxy. We covered everything from the initial server preparation to accessing the Nexus Web UI securely via HTTPS. Now that you've got Nexus up and running, it's time to roll up our sleeves and dive into the nitty-gritty of using this powerful tool effectively.

Nexus Dashboard

Upon logging into the Nexus web UI, you'll be greeted by a dashboard showcasing several pre-defined repositories.

Predefined Repositories

For those of us who prefer a clean slate and better organization, we're going to start by decluttering. We'll remove all the pre-defined repositories and the default blob storage. This approach allows us to create a more tailored setup, with dedicated repositories and blobs for each category we'll be working with.

Let's begin by logging in with the admin user and navigating to the administration section.

Clearing the Slate

First, we'll tackle the repositories. One by one, we'll select each repository and hit that Delete repository button.

Delete Predefined Repositories 1

Hit Delete and confirm your choice.

Delete Predefined Repositories 2

Next, we'll turn our attention to the default blob storage.

Head over to the Blob Stores section and locate the default blob store.

Delete Predefined Blob 1

Hit Delete and confirm your choice.

Delete Predefined Blob 2

Building Our Custom Setup

Now that we've cleared the decks, it's time to start building our custom setup. We'll create new blob stores, each dedicated to a specific type of repository. This approach allows for better organization and management of our assets.

Let's start by creating a new blob store for our Maven repositories. Navigate to the administrator blob stores menu and click on Create blob store.

Create new blobs

Select File as the type and name it maven. This will be our dedicated storage space for all things Maven.

Predefined Repositories

Repeat this process to create blob stores for other types of repositories you'll be working with. In our case, we'll set up separate stores for:

  • Maven
  • NPM
  • Docker
  • Yum

By the end of this process, you'll have a clean, organized foundation for your Nexus setup.

Maven Repository

Now that we've laid the groundwork, it's time to set up our Maven repositories. Maven is a staple in the Java ecosystem, and having a well-configured Maven repository in Nexus can significantly streamline your development process.

Maven Proxy Repository

We're going to create two Maven proxy repositories. We'll set up one for the central Maven repository and another for the Google Maven repository.

Let's start by navigating to the repositories administrator menu and clicking that inviting Create repository button.

Create maven repositories 1

Select maven2 (proxy) from the list.

create-maven-repo-2

Now, let's fill in the details for our central Maven repository:

Name: maven-central
Remote Storage: https://repo1.maven.org/maven2/
Blob Store: maven
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create-maven-repo-3

create-maven-repo-4

Hit Create to create the repository.

Great! Now let's repeat this process for the Google Maven repository. Use these values:

Name: maven-google
Remote Storage: https://maven.google.com/
Blob Store: maven
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Maven Group Repository

Now that we have our individual Maven proxy repositories set up, it's time to group them together. You can give clients the single URL of the group repository and manage the group repository on the Nexus side without having to change the repository URL.

Head back to the repositories administrator menu and click Create repository  again. This time, select maven2 (group).

create-maven-group-repo-1.

Select maven2 (group).
create-maven-group-repo-2

Let's set it up with these details:

Name: maven
Blob: maven
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In the group section, click on the previously created repositories and use the right arrow to move both repositories to the members column.

create-maven-group-repo-3

Hit that 'Create repository' button, and voila! Your Maven repository is ready to serve.

Raw Proxy for Gradle Zip File

If you're planning to use this Maven repository for Android development, there's one more piece of the puzzle we need to address. The gradlew tool needs to download the Gradle distribution zip file, and we want to ensure it does so through our Nexus repository.

Go to the repositories administrator menu and click Create repository.

Select raw (proxy).
create-maven-raw-proxy-repo-1.

Fill in the details:

Name: gradle-distributions
Remote storage: https://services.gradle.org/distributions/
Blob store: maven
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create-maven-raw-proxy-repo-2

Now maven repositories are ready to use. You can head to the [[#Maven Usage Examples]] if you want to skip other repository configuration examples.

NPM Repository

Next up, let's set up our NPM repository to manage JavaScript packages efficiently.

NPM Proxy Repository

We'll create two NPM proxy repositories: one for the main npm registry and another for the Yarn package registry. This dual setup helps reduce potential downtime and provides a fallback option.

Navigate to the repositories menu and create a new repository, selecting npm (proxy).

create-npm-proxy-repo-1

create-npm-proxy-repo-2

For the npm registry, use these settings:

Name: npmjs
Remote Storage: https://registry.npmjs.org
Blob: npm
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create-npm-proxy-repo-3
Hit "Create repository".

Repeat the process for the Yarn registry:

Name: yarnpkg
Remote Storage: https://registry.yarnpkg.com
Blob: npm
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NPM Group Repository

Now, let's group these repositories for easier management:

create-npm-group-repo-1

create-npm-group-repo-2
Now NPM repositories are ready to use. You can head to the [[#NPM Usage Examples]] if you want to skip other repository configuration examples.

Docker Repository

Last but not least, let's set up Docker repositories to manage container images efficiently.

We'll create proxy repositories for Docker Hub, GitHub Container Registry, and Red Hat Registry.

create-docker-proxy-repo-1

create-docker-proxy-repo-2

For Docker Hub:

Name: dockerhub
Allow anonymous docker pull: true
Remote Storage: https://registry-1.docker.io
Docker Index: Use Docker Hub 
Blob: docker
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create-docker-proxy-repo-4

Hit Create repository button.

Repeat the same process for GitHub container registry

Name: github-container-registry
Allow anonymous docker pull: true
Remote Storage: https://ghcr.io
Docker Index: Use proxy registry
Blob: docker
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[!important]
We didn't specify any HTTP or HTTPS port for the dockerhub and github-container-registry repository since we will group them and publish as groupped.

Now create another Docker proxy repository for Red Hat registry but with the values below:

Name: redhat-registry
HTTP: Enable and enter `8083`
Allow anonymous docker pull: true
Remote Storage: https://registry.access.redhat.com
Docker Index: Use proxy registry
Blob: docker
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[!important]
We are publishing the Red Hat registry directly, without a group. I am configuring the ports this way since my Nginx configuration is ready for that. You can check the previous blog for the configuration.

Container Registry Group Repository

We will group dockerhub and github-container-registry repositories.

create-docker-group-repo-1

Name: cr
HTTP: enabled on port `8082`
Blob store: docker
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create-docker-group-repo-2

create-docker-group-repo-3

Hit create repository.

Maven Usage Examples

To use your Maven repository, update your build.gradle or pom.xml files with the Nexus repository URL. For Android projects, also update the Gradle wrapper properties.

Check the Repository URLs

Go to the repositories section and check the public URL of the maven and gradle-distributions repositories.
check-maven-group-repo-url-1

Copy the URL.
check-maven-group-repo-url-2

In my example, the repository URLs:

maven: https://registry.burakberk.dev/repository/maven/
gradle distributions: https://registry.burakberk.dev/repository/gradle-distributions/
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Usage For an Android Gradle App

Create an react native application just to test android app.

npx @react-native-community/cli init myreactnativeapp && \
cd myreactnativeapp/android
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Edit the build.gradle file and add custom maven url. Remove the google() and other maven repositories.

vim build.gradle
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buildscript {
    ext {
        buildToolsVersion = "34.0.0"
        minSdkVersion = 23
        compileSdkVersion = 34
        targetSdkVersion = 34
        ndkVersion = "26.1.10909125"
        kotlinVersion = "1.9.24"
    }
    repositories {
      maven {
        url 'https://registry.burakberk.dev/repository/maven'
      }
    }
    dependencies {
        classpath("com.android.tools.build:gradle")
        classpath("com.facebook.react:react-native-gradle-plugin")
        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin")
    }
}

apply plugin: "com.facebook.react.rootproject"
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Also edit the gradle wrapper properties file to download the zip from the Nexus raw repository. Also update the timeout to a higher rate.

vim gradle/wrapper/gradle-wrapper.properties
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cat gradle/wrapper/gradle-wrapper.properties
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://registry.burakberk.dev/repository/gradle-distributions/gradle-8.8-all.zip
networkTimeout=120000
validateDistributionUrl=true
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
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Usage for other Java Applications

Edit the pom.xml  file of the project.

vim pom.xml
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Change or edit the repositories section. Add the public URL you copied from the nexus.

<repositories>
    <repository>
        <id>nexus-repo</id>
        <url>https://registry.burakberk.dev/repository/maven/</url>
    </repository>
</repositories>
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Browse the Maven Repository From Nexus UI

Check the maven repository if there are any downloaded and cached packages to make sure your configurations are correct and the packages are being downloaded from the Nexus.

check-maven-group-repo-1

NPM Usage Examples

Update your package-lock.json or yarn.lock files to use the Nexus NPM repository URL:

Head to the Nexus UI and NPM group repository named npm if you followed the guides above.
check-npm-group-repo-1

Note the repository URL
check-npm-group-repo-2

Sample NodeJS Application

Create a new react application to test the Nexus repository.

mkdir my-app && cd my-app/ && \
npx create-react-app . my-app --template typescript
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Usage for NPM

This command will replace all https://registry.npmjs.org URLs in your package-lock.json file with your own Nexus repository URL. It will also backup the original file before replacing the URLs.

NEXUS_NPM_REGISTRY_URL=https://registry.burakberk.dev/repository/npm  && \
DEFAULT_NPM_REGISTRY_URL=https://registry.npmjs.org && \
sed -i '.backup' "s#${DEFAULT_NPM_REGISTRY_URL}#${NEXUS_NPM_REGISTRY_URL}#g" package-lock.json
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Install packages.

npm install
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If you want to be sure about the downloaded packages are being downloaded from the Nexus URL, you can add --verbose flag to the npm install command.

npm install --verbose
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Usage for Yarn

This command will replace all https://registry.npmjs.org URLs in your yarn.lock file with your own Nexus repository URL. It will also backup the original file before replacing the URLs.

NEXUS_NPM_REGISTRY_URL=https://registry.burakberk.dev/repository/npm  && \
DEFAULT_NPM_REGISTRY_URL=https://registry.yarnpkg.com && \
sed -i '.backup' "s#${DEFAULT_NPM_REGISTRY_URL}#${NEXUS_NPM_REGISTRY_URL}#g" yarn.lock
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Install packages.

yarn install
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If you want to be sure about the downloaded packages are being downloaded from the Nexus URL, you can add --verbose flag to the npm install command.

yarn install --verbose
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Browse the NPM Repository From Nexus UI

Check the NPM repository if there are any downloaded and cached packages to make sure your configurations are correct and the packages are being downloaded from the Nexus.

check-npm-group-repo-3

Docker Usage Examples

CR registry: Group of Docker Hub and Github Container Registry

Try to pull a standart image like nginx or ubuntu.

$ docker pull cr.burakberk.dev/nginx
Using default tag: latest
latest: Pulling from nginx
302e3ee49805: Pull complete
d07412f52e9d: Pull complete
9ab66c386e9c: Pull complete
4b563e5e980a: Pull complete
55af3c8febf2: Pull complete
5b8e768fb22d: Pull complete
85177e2c6f39: Pull complete
Digest: sha256:d2eb56950b84efe34f966a2b92efb1a1a2ea53e7e93b94cdf45a27cf3cd47fc0
Status: Downloaded newer image for cr.burakberk.dev/nginx:latest
cr.burakberk.dev/nginx:latest
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Successfully pulled the image from the Nexus repository. The image is downloaded from the Docker Hub proxy registry.

Now lets try to pull a Github container registry specific image.

docker pull cr.burakberk.dev/github/super-linter:latest
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Successfully pulled ✅

check-docker-group-repo-1

Red Hat Registry

Run the docker pull command on two different registries and see if you can pull the images from the Nexus installation.

For example, pulling the ubi:8.10-1088 image from the redhat-registry.

$ docker pull redhat-registry.burakberk.dev/ubi8/ubi:8.10-1088
8.10-1088: Pulling from ubi8/ubi
148a3ed2f70e: Pull complete
Digest: sha256:a965f33ee4ee57dc8e40a1f9350ddf28ed0727b6cf80db46cdad0486a7580f9d
Status: Downloaded newer image for redhat-registry.burakberk.dev/ubi8/ubi:8.10-1088
redhat-registry.burakberk.dev/ubi8/ubi:8.10-1088
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Successfully pulled ✅

Also browse the Nexus repository and check if the image exists.

create-docker-group-repo-4

Conclusion

Congratulations! You've now set up a comprehensive Nexus repository manager capable of handling Maven, NPM, and Docker packages. This setup will provide faster access to packages and greater control over your dependencies.

Remember to regularly maintain your Nexus instance, keeping an eye on storage usage and updating proxy repositories as needed.

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