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The best practice is to regularly review if you need proxies and take them offline when they are not actively being used. Every proxy in a group repository adds time to resolve dependencies and overhead to the server. You may accumulate a number of proxies over time and not remember why or who uses them unless you start out with a clear onboarding process, strict RBAC roles, and good documentation. This happens when a proxy is made against a remote group repository which may also include a proxy to the source repository.

When proxying remote group repositories, it is pretty easy to create circle references.

Keep group repositories to only the proxies that are needed for the build and leverage a single hosted repository for teams where possible.

Avoid using large group repositories (hundreds) where many remote proxies are configured as this will very negatively affect performance as the group will need to check each remote repository for every request.

They are more complicated to backup and recover from any form of outage. Each additional remote location will require an exponential number of connections and proxies to keep the organization connected.

The central hub and spoke model, where built artifacts are written to a central server, is far easier to manage and scale than trying to set up a bi-direction configuration.

Here are some considerations to keep in mind. When building artifacts remotely they may also want to set up a bidirectional flow of artifacts using a combination of proxies and hosted repositories. Remote teams may choose to run a local repository manager to proxy components from a centrally managed server.

For other repositories, only ALLOW access to the namespaces that are required from that repository.ĭevelopment teams are often located across the globe.

For public repositories, BLOCK access to internal namespaces to prevent dependency confusion attacks.

It is a best practice to use routing rules on all proxy repositories.

Routing rules will speed up access times for group repositories by limiting requests to only the proxies where the components should be fetched. Routing rules can help with dependency confusion like attacks against an organization’s internal namespace. Administrators use routing rules to limit requests to external repositories to only the artifacts needed from the proxy. Routing rules are incredibly useful tools that are often overlooked. We will go through the most common ones here. There are a number of recommendations regarding proxy repositories that are fairly universal to any production instance.

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The component is then forwarded to your build.įuture requests for the same component skip the external request and immediately deliver the component.Īs part of a Nexus Repository Manager Health check workshop, we review the server configuration and provide detailed recommendations on how to better optimize your repository instance.

If the component is not cached, the request is forwarded to the remote repository, downloaded, and cached to the local storage.

Your build makes a request for a component from the proxy repository.Here is a simple example of the proxy in action. They respond in exactly the same way as the public repository would however they allow your organization to centrally manage to cache, ensure your dependencies are always available, and greatly reduce traffic to external servers. These could be the public repositories for open source components or private repositories such as another Nexus Repository for instance. Redirecting traffic through proxy repositories is a primary use case when using a universal artifact repository like Repository Manager.Ī proxy repository is a substitute access point and managed cache for remote repositories. In a modern DevOps pipeline, organizations have multiple build servers and development teams so trying to manage multiple component caches is not efficient or cost-effective. This speeds up build times and keeps the final output consistent, however it can introduce risk as the local cache is not centrally managed or consistent everywhere the application is built.

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They will often use the local cache first to see if the component already exists in order t o reduce the number of requests and the bandwidth used to download all the components from the remote repository.

Share best practices when using proxies at scaleĭependency managers use components from public open-source repositories such as Central, npm, and PyPI to build applications.

Discuss audit guidelines for proxy repositories.

Explain the value of proxy repositories.