[{"data":1,"prerenderedAt":812},["ShallowReactive",2],{"/en-us/blog/a-story-of-runner-scaling":3,"navigation-en-us":43,"banner-en-us":443,"footer-en-us":453,"blog-post-authors-en-us-Darwin Sanoy|Brian Wald":695,"blog-related-posts-en-us-a-story-of-runner-scaling":723,"assessment-promotions-en-us":763,"next-steps-en-us":802},{"id":4,"title":5,"authorSlugs":6,"body":9,"categorySlug":10,"config":11,"content":15,"description":9,"extension":29,"isFeatured":13,"meta":30,"navigation":31,"path":32,"publishedDate":22,"seo":33,"stem":37,"tagSlugs":38,"__hash__":42},"blogPosts/en-us/blog/a-story-of-runner-scaling.yml","A Story Of Runner Scaling",[7,8],"darwin-sanoy","brian-wald",null,"engineering",{"slug":12,"featured":13,"template":14},"a-story-of-runner-scaling",false,"BlogPost",{"title":16,"description":17,"authors":18,"heroImage":21,"date":22,"body":23,"category":10,"tags":24},"An SA story about hyperscaling GitLab Runner workloads using Kubernetes","It is important to have the complete picture of scaled effects in view when designing automation.",[19,20],"Darwin Sanoy","Brian Wald","https://res.cloudinary.com/about-gitlab-com/image/upload/v1749669897/Blog/Hero%20Images/kaleidico-26MJGnCM0Wc-unsplash.jpg","2022-06-29","\n\nThe following *fictional story*\u003Csup>1\u003C/sup> reflects a repeating pattern that Solutions Architects at GitLab encounter frequently. In the analysis of this story we intend to demonstrate three things: (a) Why one should be thoughtful in leveraging Kubernetes for scaling, (b) How unintended consequences of an approach to automation can create a net productivity loss for an organization (reversal of ROI) and (c) How solutions architecture perspectives can help find anti-patterns - retrospectively or when applied during a development process.\n\n### A DevOps transformation story snippet\n\nGild Investment Trust went through a DevOps transformational effort to build efficiency in their development process through automation with GitLab. Dakota, the application development director, knew that their current system handled about 80 pipelines with 600 total tasks and over 30,000 CI minutes so they knew that scaled CI was needed. Since development occurred primarily during European business hours, they were interested in reducing compute costs outside of peak work hours. Cloud compute was also a target due to acquring the pay per use model combined with elastic scaling.\n\nIngrid was the infrastructure engineer for developer productivity who was tasked with building out the shared GitLab Runner fleet to meet the needs of the development teams. At the beginning of the project she made a successful bid to leverage Kubernetes to scale CI and CD to take advantage of the elastic scaling and high availability all with the efficiency of containers. Ingrid had recently achieved the Certified Kubernetes Administrator (CKA) certification and she was eager to put her knowledge to practical use. She did some additional reading around applications running on Kubernetes and noted the strong emphasis on minimizing the resource profile of microservices to achieve efficiency in the form of compute density. She defined runner containers with 2GB of memory and 750millicores (about three quarters of a CPU) had good results from running some test CI pipelines. She also decided to leverage the Kubernetes Cluster Autoscaler which would use the overall cluster utilization and scheduling to automatically add and remove Kubernetes worker nodes for smooth elastic scaling in response to demand.\n\nAbout 3 months into the proof of concept implementation, Sasha, a developer team lead, noted that many of their new job types were failing with strange error messages. The same jobs ran fine on quickly provisioned GitLab shell runners. Since the primary difference between the environments was the liberal allocation of machine resources in a shell runner, Sasha reasoned that the failures were likely due to the constrained CPU and memory resources of the Kubernetes pods.\n\nTo test this hypothesis, Ingrid decided to add a new pod definition. She found it was difficult to discern which of the job types were failing due to CPU constraints, which ones due to memory constraints and which ones due to the combination of both. She knew it could be a lot of her time to discern the answer. She decided to simply define a pod that was more liberal on both CPU and memory and have it be selectable by runner tagging when more resources were needed for certain CI jobs. She created a GitLab Runner pod definition with 4GB of memory and 1750 millicores of CPU to cover the failing job types. Developers could then use these larger containers when the smaller ones failed by adding the ‘large-container’ tag to their GitLab job.\n\nSasha redid the CI testing and was delighted to find that the new resourcing made all the troubling jobs work fine. Sasha created a guide for developers to try to help discern when mysterious error messages and failed CI jobs were probably the fault of resourcing and then how to add a runner tag to the job to expand the resources.\n\nSome weeks later two of the key jobs that were fixed by the new container resourcing started intermittently failing on NPM package creation jobs for just 3 pipelines on 2 different teams. Of course Sasha tried to understand what the differences were and found that these particular pipelines were packaging notably large file sets because they were actually packaging testing data and the NPM format was a convenient way to provide testing data during automated QA testing.\n\nSasha brought this information to Ingrid and together they did testing to figure out that a 6GB container with 2500 millicores would be sufficient for creating an NPM package out of the current test dataset size. They also discussed whether the development team might want to use a dedicated test data management solution, but it turned out that the teams needs were very simple and that their familiarity with NPM packaging meant that bending NPM packaging to suit their purpose was actually more efficient than acquiring, deploying, learning and maintaining a special system for this purpose. So a new pod resourcing profile was defined and could be accessed with the runner tag ‘xlarge’.\n\nSasha updated the guide for finding the optimal container size through failure testing of CI jobs - but they were not happy with how large the document was getting and how imprecise the process was for determining when a CI job failure was, most likely due to container resource constraints. They were concerned that developers would not go through the process and instead simply pick the largest container resourcing profile in order to avoid the effort of optimizing and they shared this concern with Ingrid. In fact, Sasha noted, they were hard pressed themselves to follow their own guidelines and not to simply choose the largest container for all jobs themselves.\n\nThe potential for this cycle to repeat was halted several months later when Dakota, the app dev director, generated a report that showed a 2% increase in developer time spent optimizing CI jobs using failure testing for container size optimization. Dakota considered this work to be a net new increase because when the company was not using container-based CI, the developers did not have to manage this concern at all. Across 298 developers this amounted to around $840,000/yr dollars of total benefits per month\u003Csup>2\u003C/sup>. It was also thought to add about 2 hours (and growing) to developer onboarding training. It was noted that the report did not attempt to account for the opportunity cost tax - what would these people be doing to solve customer problems with that time? It also did not account for the \"critical moments tax\" (when complexity has an outsized frustration effect and business impact on high pressure, high risk situations).\n\n### Solution architecture retrospective: What went wrong?\n\nThis story reflects a classic antipattern we see at GitLab, not only with regard to Kubernetes runner optimization, but also across other areas, such as overly minimalized build containers and the potential for resultant pipeline complexity as was discussed in a previous blog called [When the pursuit of simplicity creates complexity in container-based CI pipelines](/blog/second-law-of-complexity-dynamics/). Frequently this result comes from inadvertent adherance to heuristics of a small part of the problem as though they were applicable to the entirety of the problem (a type of a logical “fallacy of composition”).\n\nThankfully the emergence of the anti-pattern follows a pattern itself :). Let’s apply a little retrospective solution architecture to the \"what happened\" in order to learn what might be done proactively next time to create better iterations on the next automation project.\n\nThere is a certain approach to landscaping shared greenspaces where, rather than shame people into compliance with signs about not cutting across the grass in key locations, the paths that humans naturally take are interpreted as the signal “there should be a path here.” Humans love beauty and detail in the environments they move through, but depending on the space, they can also value the efficiency of the shortest possible route slightly higher than aesthetics. A wise approach to landscaping holds these factors in a balance that reflects the efficiency versus aesthetic appeal balance of the space user. The space stays beautiful without any shaming required.\n\nIn our story Sasha and Ingrid had exactly this kind of cue where the developers were likely to walk across the grass. If that cue is taken to be a signal that reflects efficiency, we can quickly see what can be done to avoid the antipattern when it starts to occur.\n\nThe signal was the observation that developers might simply choose the largest container all the time to avoid the fussy process of optimizing the compute resources being consumed. Some would consider that laziness and not a good signal to heed. However, most human laziness is deeply rooted in efficiency trade-offs. The developers intuitively understand that their time fussing with failure testing to optimize job containers and their time diagnosing intermittent failures due to the varying content of those jobs, is not worth the amount of compute saved. That is especially true given the opportunity cost of not spending that time innovating the core software solution for the revenue generating application.\n\nIngrid and Sasha’s collaboration has initially missed the scaled human toil factor that was introduced to keep container resources at the minimum tolerable levels. They failed to factor in the escalating cost of scaled human toil to have a comprehensive efficiency measurement. They were following a microservices resourcing pattern which assumes the compute is purpose designed around minimal and well known workloads. When taken as a whole in a shared CI cluster, CI compute follows generalized compute patterns where the needs for CPU, Memory, Disk IO and Network IO can vary wildly from one moment to the next.\n\nIn the broadest analysis, the infrastructure team over indexed to the “team local” optimization of compute efficiency and unintentionally created a global de-optimization of scaled human toil for another team.\n\n## How can this antipattern be avoided?\n\nOne way to combat over indexing on a criteria is to have balancing objectives. This need is covered in \"Measure What Matters\" with the concept of counter balancing objectives. There are some counter balancing questions that can be asked of almost any automation effort. When solution architecture is functioning well these counter balancing questions are asked during the iterative process of building out a solution. Here are some applicable ones for this effort:\n\n**Approporiate Rules: Does the primary compute optimization heuristic match the characteristics of the actual compute workload being optimized?**\n\nThe main benefits of container compute for CI are dependency isolation, dependency encapsulation and a clean build environment for every job. None of these benefits has to do with the extreme resource optimizations available to engineer microservices architected applications. As a whole, CI compute reflects generalized compute, not the ultra-specialized compute of a 12 factor architected micro-service.\n\n**Appropriate granularity: Does optimization need to be applied at every level?**\n\nThe fact that the cluster itself has elastic scaling at the Kubernetes node level is a higher order optimization that will generate significant savings. Another possible optimization that would not require continuous fussing by developers is having a node group running on spot compute (as long as the spot compute runners self-identify their compute as spot so pipeline engineers can select appropriate jobs for spot). These optimizations can create huge savings, without creating scaled human toil.\n\n**People and processes counter check: Does the approach to optimization create scaled human toil by its intensity and/or frequency and/or lack of predictability for any people anywhere in the organization?**\n\nAutomation is all about moving human toil into the world of machines. While optimizing machine resources must always be a primary consideration, it is a lower priority objective than creating a net increase in human toil anywhere in your company. Machines can efficiently and elastically scale, while human workforces respond to scaling needs in months or even years.\n\n### Avoid scaled human toil\n\nNotice that neither the story, nor the qualifying questions, imply there is never a valid reason to have specialized runners that developers might need to select using tags. If a given attribute of runners could be selected once and with confidence then the antipattern would not be in play. One example would be selecting spot compute backed runners for workloads that can tolerate termination. It is the potential for repeated needed attention to calibrate container sizing - made worse by the possibility of intermittent failure based on job content - that pushes this specific scenario into the potential realm of “scaled human toil.” The ability to leverage elastic cluster autoscaling is also a huge help to managing compute resources more efficiently.\n\nIf the risk of scaled human toil could be removed then some of this approach may be able to be preserved. For example, having very large minimum pod resourcing and then a super-size for stuff that breaks the standard pod size just once. Caution is still warranted because it is still possible that developers have to fuss a lot to get a two pod approach working in practice.\n\n### Beware of scaled human toil of an individual\n\nOne thing the story did not highlight is that even if we were able to move all the fussing of such a design to the Infrastructure Engineer persona (perhaps by building an AI tuning mechanism that guesses at pod resourcing for a given job), the cumulative taxes on their role are frequently still not worth the expense. This is, in part, because they have a leveraged role - they help with all the automation of the scaled developer workforce and any time they spend on one activity can’t be spent on another. We humans are generally bad at accounting for opportunity costs - what else could that specific engineer be innovating on to make a stronger overall impact to the organization’s productivity or bottom line? Given the very tight IT labor market, a given function may not be able to add headcount, so opportunity costs take on an outsized importance.\n\n### Unlike people’s time, cloud compute does not carry opportunity cost\n\nA long time ago people had to schedule time on shared computing resources. If the time was used for low-value compute activities it could be taking away time from higher value activities. In this model compute time has an opportunity cost - the cost of what it could be using that time for if it wasn’t doing a lower value activity. Cloud compute has changed this because when compute is not being used, it is not being paid for. Additionally, elastic scaling eliminates the costs of over provisioning hardware and completely eliminates the administrative overhead of procuring capacity - if you need lots for a short period of time it is immediately available. In contrast, people time is not elastically scalable nor pay per use. This means that the opportunity cost question “What could this time be used for if it didn’t have to be spent on low value activities?” is still relevant for anything that creates activities for people.\n\n### The first corollary to the Second Law of Complexity Dynamics\n\nThe Second Law of Complexity Dynamics was introduced in an earlier blog. The essence is that complexity is never destroyed - it is only reformed - and primarily it is moved across a boundary line that dictates whether the management of the complexity is in our domain or externalized. For instance, if you write a function for md5 hashing in your code, you are managing the complexity of that code. If you install a dependency package that contains a premade md5 hash function that you simply use, then the complexity is externalized and managed for you by someone else.\n\nIn this story we are introducing the corollary to that “Law” that “**Exchanging Raw Machine Resources for Complexity Management is Generally a Reasonable Trade-off.**” In this case our scaled human toil is created due to the complexity of unending, daily management of optimizing compute efficiency. This does not mean that burning thousands of dollars of inefficient compute is OK because it saved someone 20 minutes of fussing. It is scoped in the following way:\n\n- scoped to “complexity management” (which is creating the “scaled human toil” in our story) - many minutes of toil that increases proportionally or compounds with more of the activity.\n- scoped to “raw machine resources” - meaning that there is not additional logistics nor human toil to gain the resources. In the cloud raw machine resources are generally available via configuration tweaks.\n- scoped to “generally reasonable” - this indicates a disposition of being very cautious about increasing human toil with an automatoin solution - but it still makes sense to use models or calculations to check if the rule actually holds in a given case.\n\nSo if we can externalize complexity management that is great (The Second Law of Complexity Dynamics). If we can trade complexity management for raw computing resource, that is likely still better than managing it ourselves (The First Corollary).\n\n### Iterating SA: Experimental improvements for your next project\n\nThis post contains specifics that can be used to avoid antipatterns in building out a Kubernetes cluster for GitLab CI. However, in the qualifying questions we’ve attempted to kick it up to one meta-level higher to help assess whether any automation effort may have an “overly local” optimization focus which can inadvertently create a net loss of efficiency across the more global “company context.” It is our opinion that automation efforts that create a net loss in human productivity should not be classified as automation at all. While it’s strong medicine to apply to one’s work, we feel that doing so causes appropriate innovation pressure to ensure that individual automation efforts truly deliver on their inherent promise of higher human productivity and efficiency. So simply ask “Does this way of solving a problem cause recurring work for anyone?”\n\n### DevOps transformation and solution architecture perspectives\n\nA technology architecture focus rightfully hones in on the technology choices for a solution build. However, if it is the only lens, it can result in scenarios like our story. Solutions architecture steps back to a broader perspective to sanity-check that solution iterations account for a more complete picture of both the positive and negative impacts across all three of people, processes and technology. As an organizational competency, DevOps emphasis solution architecture perspectives when it is defined as a collaborative and cultural approach to people, processes and technology.\n\nFootnotes:\n\n1. This fictional story was devised specifically for this article and does not knowingly reflect the details of any other published story or an actual situation. The names used in the story are from [GitLab’s list of personas](https://handbook.gitlab.com/handbook/product/personas/).\n2. Across a team of 300 full time developers. 9.6min/workday x 250 workdays / year = 2400mins / 8hrs/workday  = 5 workdays x $560 per day (140K Total Comp/250days) = $2800/dev/year x 300 developers = $840,000/yr\n\nCover image by [Kaleidico](https://unsplash.com/@kaleidico?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText) on [Unsplash](https://unsplash.com/)\n",[25,26,27,28],"CI","CD","performance","solutions 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statement",{"items":685},[686,689,692],{"text":687,"config":688},"Terms",{"href":513,"dataGaName":514,"dataGaLocation":461},{"text":690,"config":691},"Cookies",{"dataGaName":523,"dataGaLocation":461,"id":524,"isOneTrustButton":31},{"text":693,"config":694},"Privacy",{"href":518,"dataGaName":519,"dataGaLocation":461},[696,711],{"id":697,"title":19,"body":9,"config":698,"content":700,"description":9,"extension":29,"meta":706,"navigation":31,"path":707,"seo":708,"stem":709,"__hash__":710},"blogAuthors/en-us/blog/authors/darwin-sanoy.yml",{"template":699},"BlogAuthor",{"role":701,"name":19,"config":702},"Field Chief Cloud Architect",{"headshot":703,"linkedin":704,"ctfId":705},"https://res.cloudinary.com/about-gitlab-com/image/upload/v1749659751/Blog/Author%20Headshots/Darwin-Sanoy-headshot-395-square-gitlab-teampage-avatar.png","https://linkedin.com/in/darwinsanoy","DarwinJS",{},"/en-us/blog/authors/darwin-sanoy",{},"en-us/blog/authors/darwin-sanoy","UkMMwmU5o2e6Y-wBltA9E_z96LvHuB-bG6VW9DsLzIY",{"id":712,"title":20,"body":9,"config":713,"content":714,"description":9,"extension":29,"meta":718,"navigation":31,"path":719,"seo":720,"stem":721,"__hash__":722},"blogAuthors/en-us/blog/authors/brian-wald.yml",{"template":699},{"name":20,"config":715},{"headshot":716,"ctfId":717},"https://res.cloudinary.com/about-gitlab-com/image/upload/v1749659488/Blog/Author%20Headshots/gitlab-logo-extra-whitespace.png","78qOxgHKlgDY2IxMrBrgCu",{},"/en-us/blog/authors/brian-wald",{},"en-us/blog/authors/brian-wald","5Q1gvafW_GWqOIMuzuluMCFYFcgFz-Zdg1I0S9LPU6k",[724,739,752],{"content":725,"config":737},{"title":726,"description":727,"authors":728,"heroImage":730,"date":731,"body":732,"category":10,"tags":733},"How to use GitLab Container Virtual Registry with Docker Hardened Images","Learn how to simplify container image management with this step-by-step guide.",[729],"Tim Rizzi","https://res.cloudinary.com/about-gitlab-com/image/upload/v1772111172/mwhgbjawn62kymfwrhle.png","2026-03-12","If you're a platform engineer, you've probably had this conversation:\n  \n*\"Security says we need to use hardened base images.\"*\n\n*\"Great, where do I configure credentials for yet another registry?\"*\n\n*\"Also, how do we make sure everyone actually uses them?\"*\n\nOr this one:\n\n*\"Why are our builds so slow?\"*\n\n*\"We're pulling the same 500MB image from Docker Hub in every single job.\"*\n\n*\"Can't we just cache these somewhere?\"*\n\nI've been working on [Container Virtual Registry](https://docs.gitlab.com/user/packages/virtual_registry/container/) at GitLab specifically to solve these problems. It's a pull-through cache that sits in front of your upstream registries — Docker Hub, dhi.io (Docker Hardened Images), MCR, and Quay — and gives your teams a single endpoint to pull from. Images get cached on the first pull. Subsequent pulls come from the cache. Your developers don't need to know or care which upstream a particular image came from.\n\nThis article shows you how to set up Container Virtual Registry, specifically with Docker Hardened Images in mind, since that's a combination that makes a lot of sense for teams concerned about security and not making their developers' lives harder.\n\n## What problem are we actually solving?\n\nThe Platform teams I usually talk to manage container images across three to five registries:\n\n* **Docker Hub** for most base images\n* **dhi.io** for Docker Hardened Images (security-conscious workloads)\n* **MCR** for .NET and Azure tooling\n* **Quay.io** for Red Hat ecosystem stuff\n* **Internal registries** for proprietary images\n\nEach one has its own:\n\n* Authentication mechanism\n* Network latency characteristics\n* Way of organizing image paths\n\nYour CI/CD configs end up littered with registry-specific logic. Credential management becomes a project unto itself. And every pipeline job pulls the same base images over the network, even though they haven't changed in weeks.\n\nContainer Virtual Registry consolidates this. One registry URL. One authentication flow (GitLab's). Cached images are served from GitLab's infrastructure rather than traversing the internet each time.\n\n## How it works\n\nThe model is straightforward:\n\n```text\nYour pipeline pulls:\n  gitlab.com/virtual_registries/container/1000016/python:3.13\n\nVirtual registry checks:\n  1. Do I have this cached? → Return it\n  2. No? → Fetch from upstream, cache it, return it\n\n```\n\nYou configure upstreams in priority order. When a pull request comes in, the virtual registry checks each upstream until it finds the image. The result gets cached for a configurable period (default 24 hours).\n\n```text\n┌─────────────────────────────────────────────────────────┐\n│                    CI/CD Pipeline                       │\n│                          │                              │\n│                          ▼                              │\n│   gitlab.com/virtual_registries/container/\u003Cid>/image   │\n└─────────────────────────────────────────────────────────┘\n                           │\n                           ▼\n┌─────────────────────────────────────────────────────────┐\n│            Container Virtual Registry                   │\n│                                                         │\n│  Upstream 1: Docker Hub ────────────────┐               │\n│  Upstream 2: dhi.io (Hardened) ────────┐│               │\n│  Upstream 3: MCR ─────────────────────┐││               │\n│  Upstream 4: Quay.io ────────────────┐│││               │\n│                                      ││││               │\n│                    ┌─────────────────┴┴┴┴──┐            │\n│                    │        Cache          │            │\n│                    │  (manifests + layers) │            │\n│                    └───────────────────────┘            │\n└─────────────────────────────────────────────────────────┘\n```\n\n## Why this matters for Docker Hardened Images\n\n[Docker Hardened Images](https://docs.docker.com/dhi/) are great because of the minimal attack surface, near-zero CVEs, proper software bills of materials (SBOMs), and SLSA provenance. If you're evaluating base images for security-sensitive workloads, they should be on your list.\n\nBut adopting them creates the same operational friction as any new registry:\n\n* **Credential distribution**: You need to get Docker credentials to every system that pulls images from dhi.io.\n* **CI/CD changes**: Every pipeline needs to be updated to authenticate with dhi.io.\n* **Developer friction**: People need to remember to use the hardened variants.\n* **Visibility gap**: It's difficulat to tell if teams are actually using hardened images vs. regular ones.\n\nVirtual registry addresses each of these:\n\n**Single credential**: Teams authenticate to GitLab. The virtual registry handles upstream authentication. You configure Docker credentials once, at the registry level, and they apply to all pulls.\n\n**No CI/CD changes per-team**: Point pipelines at your virtual registry. Done. The upstream configuration is centralized.\n\n**Gradual adoption**: Since images get cached with their full path, you can see in the cache what's being pulled. If someone's pulling `library/python:3.11` instead of the hardened variant, you'll know.\n\n**Audit trail**: The cache shows you exactly which images are in active use. Useful for compliance, useful for understanding what your fleet actually depends on.\n\n## Setting it up\n\nHere's a real setup using the Python client from this demo project.\n\n### Create the virtual registry\n\n```python\nfrom virtual_registry_client import VirtualRegistryClient\n\nclient = VirtualRegistryClient()\n\nregistry = client.create_virtual_registry(\n    group_id=\"785414\",  # Your top-level group ID\n    name=\"platform-images\",\n    description=\"Cached container images for platform teams\"\n)\n\nprint(f\"Registry ID: {registry['id']}\")\n# You'll need this ID for the pull URL\n```\n\n### Add Docker Hub as an upstream\n\nFor official images like Alpine, Python, etc.:\n\n```python\ndocker_upstream = client.create_upstream(\n    registry_id=registry['id'],\n    url=\"https://registry-1.docker.io\",\n    name=\"Docker Hub\",\n    cache_validity_hours=24\n)\n```\n\n### Add Docker Hardened Images (dhi.io)\n\nDocker Hardened Images are hosted on `dhi.io`, a separate registry that requires authentication:\n\n```python\ndhi_upstream = client.create_upstream(\n    registry_id=registry['id'],\n    url=\"https://dhi.io\",\n    name=\"Docker Hardened Images\",\n    username=\"your-docker-username\",\n    password=\"your-docker-access-token\",\n    cache_validity_hours=24\n)\n```\n\n### Add other upstreams\n\n```python\n# MCR for .NET teams\nclient.create_upstream(\n    registry_id=registry['id'],\n    url=\"https://mcr.microsoft.com\",\n    name=\"Microsoft Container Registry\",\n    cache_validity_hours=48\n)\n\n# Quay for Red Hat stuff\nclient.create_upstream(\n    registry_id=registry['id'],\n    url=\"https://quay.io\",\n    name=\"Quay.io\",\n    cache_validity_hours=24\n)\n```\n\n### Update your CI/CD\n\nHere's a `.gitlab-ci.yml` that pulls through the virtual registry:\n\n```yaml\nvariables:\n  VIRTUAL_REGISTRY_ID: \u003Cyour_virtual_registry_ID>\n\n  \nbuild:\n  image: docker:24\n  services:\n    - docker:24-dind\n  before_script:\n    # Authenticate to GitLab (which handles upstream auth for you)\n    - echo \"${CI_JOB_TOKEN}\" | docker login -u gitlab-ci-token --password-stdin gitlab.com\n  script:\n    # All of these go through your single virtual registry\n    \n    # Official Docker Hub images (use library/ prefix)\n    - docker pull gitlab.com/virtual_registries/container/${VIRTUAL_REGISTRY_ID}/library/alpine:latest\n    \n    # Docker Hardened Images from dhi.io (no prefix needed)\n    - docker pull gitlab.com/virtual_registries/container/${VIRTUAL_REGISTRY_ID}/python:3.13\n    \n    # .NET from MCR\n    - docker pull gitlab.com/virtual_registries/container/${VIRTUAL_REGISTRY_ID}/dotnet/sdk:8.0\n```\n\n### Image path formats\n\nDifferent registries use different path conventions:\n\n| Registry | Pull URL Example |\n|----------|------------------|\n| Docker Hub (official) | `.../library/python:3.11-slim` |\n| Docker Hardened Images (dhi.io) | `.../python:3.13` |\n| MCR | `.../dotnet/sdk:8.0` |\n| Quay.io | `.../prometheus/prometheus:latest` |\n\n### Verify it's working\n\nAfter some pulls, check your cache:\n\n```python\nupstreams = client.list_registry_upstreams(registry['id'])\nfor upstream in upstreams:\n    entries = client.list_cache_entries(upstream['id'])\n    print(f\"{upstream['name']}: {len(entries)} cached entries\")\n\n```\n\n## What the numbers look like\n\nI ran tests pulling images through the virtual registry:\n\n| Metric | Without Cache | With Warm Cache |\n|--------|---------------|-----------------|\n| Pull time (Alpine) | 10.3s | 4.2s |\n| Pull time (Python 3.13 DHI) | 11.6s | ~4s |\n| Network roundtrips to upstream | Every pull | Cache misses only |\n\n\n\n\nThe first pull is the same speed (it has to fetch from upstream). Every pull after that, for the cache validity period, comes straight from GitLab's storage. No network hop to Docker Hub, dhi.io, MCR, or wherever the image lives.\n\nFor a team running hundreds of pipeline jobs per day, that's hours of cumulative build time saved.\n\n## Practical considerations\nHere are some considerations to keep in mind:\n\n### Cache validity\n\n24 hours is the default. For security-sensitive images where you want patches quickly, consider 12 hours or less:\n\n```python\nclient.create_upstream(\n    registry_id=registry['id'],\n    url=\"https://dhi.io\",\n    name=\"Docker Hardened Images\",\n    username=\"your-username\",\n    password=\"your-token\",\n    cache_validity_hours=12\n)\n```\n\nFor stable, infrequently-updated images (like specific version tags), longer validity is fine.\n\n### Upstream priority\n\nUpstreams are checked in order. If you have images with the same name on different registries, the first matching upstream wins.\n\n### Limits\n\n* Maximum of 20 virtual registries per group\n* Maximum of 20 upstreams per virtual registry\n\n## Configuration via UI\n\nYou can also configure virtual registries and upstreams directly from the GitLab UI—no API calls required. Navigate to your group's **Settings > Packages and registries > Virtual Registry** to:\n\n* Create and manage virtual registries\n* Add, edit, and reorder upstream registries\n* View and manage the cache\n* Monitor which images are being pulled\n\n## What's next\n\nWe're actively developing:\n\n* **Allow/deny lists**: Use regex to control which images can be pulled from specific upstreams.\n\nThis is beta software. It works, people are using it in production, but we're still iterating based on feedback.\n\n## Share your feedback\n\nIf you're a platform engineer dealing with container registry sprawl, I'd like to understand your setup:\n\n* How many upstream registries are you managing?\n* What's your biggest pain point with the current state?\n* Would something like this help, and if not, what's missing?\n\nPlease share your experiences in the [Container Virtual Registry feedback issue](https://gitlab.com/gitlab-org/gitlab/-/work_items/589630).\n## Related resources\n- [New GitLab metrics and registry features help reduce CI/CD bottlenecks](https://about.gitlab.com/blog/new-gitlab-metrics-and-registry-features-help-reduce-ci-cd-bottlenecks/#container-virtual-registry)\n- [Container Virtual Registry documentation](https://docs.gitlab.com/user/packages/virtual_registry/container/)\n- [Container Virtual Registry API](https://docs.gitlab.com/api/container_virtual_registries/)",[734,735,736],"tutorial","product","features",{"featured":13,"template":14,"slug":738},"using-gitlab-container-virtual-registry-with-docker-hardened-images",{"content":740,"config":750},{"title":741,"description":742,"authors":743,"heroImage":745,"date":746,"category":10,"tags":747,"body":749},"How IIT Bombay students are coding the future with GitLab","At GitLab, we often talk about how software accelerates innovation. But sometimes, you have to step away from the Zoom calls and stand in a crowded university hall to remember why we do this.",[744],"Nick Veenhof","https://res.cloudinary.com/about-gitlab-com/image/upload/v1750099013/Blog/Hero%20Images/Blog/Hero%20Images/blog-image-template-1800x945%20%2814%29_6VTUA8mUhOZNDaRVNPeKwl_1750099012960.png","2026-01-08",[265,617,748],"open source","The GitLab team recently had the privilege of judging the **iHack Hackathon** at **IIT Bombay's E-Summit**. The energy was electric, the coffee was flowing, and the talent was undeniable. But what struck us most wasn't just the code — it was the sheer determination of students to solve real-world problems, often overcoming significant logistical and financial hurdles to simply be in the room.\n\n\nThrough our [GitLab for Education program](https://about.gitlab.com/solutions/education/), we aim to empower the next generation of developers with tools and opportunity. Here is a look at what the students built, and how they used GitLab to bridge the gap between idea and reality.\n\n## The challenge: Build faster, build securely\n\nThe premise for the GitLab track of the hackathon was simple: Don't just show us a product; show us how you built it. We wanted to see how students utilized GitLab's platform — from Issue Boards to CI/CD pipelines — to accelerate the development lifecycle.\n\nThe results were inspiring.\n\n## The winners\n\n### 1st place: Team Decode — Democratizing Scientific Research\n\n**Project:** FIRE (Fast Integrated Research Environment)\n\nTeam Decode took home the top prize with a solution that warms a developer's heart: a local-first, blazing-fast data processing tool built with [Rust](https://about.gitlab.com/blog/secure-rust-development-with-gitlab/) and Tauri. They identified a massive pain point for data science students: existing tools are fragmented, slow, and expensive.\n\nTheir solution, FIRE, allows researchers to visualize complex formats (like NetCDF) instantly. What impressed the judges most was their \"hacker\" ethos. They didn't just build a tool; they built it to be open and accessible.\n\n**How they used GitLab:** Since the team lived far apart, asynchronous communication was key. They utilized **GitLab Issue Boards** and **Milestones** to track progress and integrated their repo with Telegram to get real-time push notifications. As one team member noted, \"Coordinating all these technologies was really difficult, and what helped us was GitLab... the Issue Board really helped us track who was doing what.\"\n\n![Team Decode](https://res.cloudinary.com/about-gitlab-com/image/upload/v1767380253/epqazj1jc5c7zkgqun9h.jpg)\n\n### 2nd place: Team BichdeHueDost — Reuniting to Solve Payments\n\n**Project:** SemiPay (RFID Cashless Payment for Schools)\n\nThe team name, BichdeHueDost, translates to \"Friends who have been set apart.\" It's a fitting name for a group of friends who went to different colleges but reunited to build this project. They tackled a unique problem: handling cash in schools for young children. Their solution used RFID cards backed by a blockchain ledger to ensure secure, cashless transactions for students.\n\n**How they used GitLab:** They utilized [GitLab CI/CD](https://about.gitlab.com/topics/ci-cd/) to automate the build process for their Flutter application (APK), ensuring that every commit resulted in a testable artifact. This allowed them to iterate quickly despite the \"flaky\" nature of cross-platform mobile development.\n\n![Team BichdeHueDost](https://res.cloudinary.com/about-gitlab-com/image/upload/v1767380253/pkukrjgx2miukb6nrj5g.jpg)\n\n### 3rd place: Team ZenYukti — Agentic Repository Intelligence\n\n**Project:** RepoInsight AI (AI-powered, GitLab-native intelligence platform)\n\nTeam ZenYukti impressed us with a solution that tackles a universal developer pain point: understanding unfamiliar codebases. What stood out to the judges was the tool's practical approach to onboarding and code comprehension: RepoInsight-AI automatically generates documentation, visualizes repository structure, and even helps identify bugs, all while maintaining context about the entire codebase.\n\n**How they used GitLab:** The team built a comprehensive CI/CD pipeline that showcased GitLab's security and DevOps capabilities. They integrated [GitLab's Security Templates](https://gitlab.com/gitlab-org/gitlab/-/tree/master/lib/gitlab/ci/templates/Security) (SAST, Dependency Scanning, and Secret Detection), and utilized [GitLab Container Registry](https://docs.gitlab.com/user/packages/container_registry/) to manage their Docker images for backend and frontend components. They created an AI auto-review bot that runs on merge requests, demonstrating an \"agentic workflow\" where AI assists in the development process itself.\n\n![Team ZenYukti](https://res.cloudinary.com/about-gitlab-com/image/upload/v1767380253/ymlzqoruv5al1secatba.jpg)\n\n## Beyond the code: A lesson in inclusion\n\nWhile the code was impressive, the most powerful moment of the event happened away from the keyboard.\n\nDuring the feedback session, we learned about the journey Team ZenYukti took to get to Mumbai. They traveled over 24 hours, covering nearly 1,800 kilometers. Because flights were too expensive and trains were booked, they traveled in the \"General Coach,\" a non-reserved, severely overcrowded carriage.\n\nAs one student described it:\n\n*\"You cannot even imagine something like this... there are no seats... people sit on the top of the train. This is what we have endured.\"*\n\nThis hit home. [Diversity, Inclusion, and Belonging](https://handbook.gitlab.com/handbook/company/culture/inclusion/) are core values at GitLab. We realized that for these students, the barrier to entry wasn't intellect or skill, it was access.\n\nIn that moment, we decided to break that barrier. We committed to reimbursing the travel expenses for the participants who struggled to get there. It's a small step, but it underlines a massive truth: **talent is distributed equally, but opportunity is not.**\n\n![hackathon class together](https://res.cloudinary.com/about-gitlab-com/image/upload/v1767380252/o5aqmboquz8ehusxvgom.jpg)\n\n### The future is bright (and automated)\n\nWe also saw incredible potential in teams like Prometheus, who attempted to build an autonomous patch remediation tool (DevGuardian), and Team Arrakis, who built a voice-first job portal for blue-collar workers using [GitLab Duo](https://about.gitlab.com/gitlab-duo/) to troubleshoot their pipelines.\n\nTo all the students who participated: You are the future. Through [GitLab for Education](https://about.gitlab.com/solutions/education/), we are committed to providing you with the top-tier tools (like GitLab Ultimate) you need to learn, collaborate, and change the world — whether you are coding from a dorm room, a lab, or a train carriage. **Keep shipping.**\n\n> :bulb: Learn more about the [GitLab for Education program](https://about.gitlab.com/solutions/education/).\n",{"slug":751,"featured":13,"template":14},"how-iit-bombay-students-code-future-with-gitlab",{"content":753,"config":761},{"title":754,"description":755,"authors":756,"heroImage":757,"date":758,"category":10,"tags":759,"body":760},"Artois University elevates research and curriculum with GitLab Ultimate for Education","Artois University's CRIL leveraged the GitLab for Education program to gain free access to Ultimate, transforming advanced research and computer science curricula.",[744],"https://res.cloudinary.com/about-gitlab-com/image/upload/v1750099203/Blog/Hero%20Images/Blog/Hero%20Images/blog-image-template-1800x945%20%2820%29_2bJGC5ZP3WheoqzlLT05C5_1750099203484.png","2025-12-10",[617,265,735],"Leading academic institutions face a critical challenge: how to provide thousands of students and researchers with industry-standard, **full-featured DevSecOps tools** without compromising institutional control. Many start with basic version control, but the modern curriculum demands integrated capabilities for planning, security, and advanced CI/CD.\n\nThe **GitLab for Education program** is designed to solve this by providing access to **GitLab Ultimate** for qualifying institutions, allowing them to scale their operations and elevate their academic offerings. \n\nThis article showcases a powerful success story from the **Centre de Recherche en Informatique de Lens (CRIL)**, a joint laboratory of **Artois University** and CNRS in France. After years of relying solely on GitLab Community Edition (CE), the university's move to GitLab Ultimate through the GitLab for Education program immediately unlocked advanced capabilities, transforming their teaching, research, and contribution workflows virtually overnight. This story demonstrates why GitLab Ultimate is essential for institutions seeking to deliver advanced computer science and research curricula.\n\n## GitLab Ultimate unlocked: Managing scale and driving academic value\n\n**Artois University's** self-managed GitLab instance is a large-scale operation, supporting nearly **3,000 users** across approximately **19,000 projects**, primarily serving computer science students and researchers. While GitLab Community Edition was robust, the upgrade to GitLab Ultimate provided the sophisticated tooling necessary for managing this scale and facilitating advanced university-level work.\n\n***\"We can see the difference,\" says Daniel Le Berre, head of research at CRIL and the instance maintainer. \"It's a completely different product. Each week reveals new features that directly enhance our productivity and teaching.\"***\n\nThe institution joined the GitLab for Education program specifically because it covers both **instructional and non-commercial research use cases** and offers full access to Ultimate's features, removing significant cost barriers.\n\n### Key GitLab Ultimate benefits for students and researchers\n\n* **Advanced project management at scale:** Master's students now benefit from **GitLab Ultimate's project planning features**. This enables them to structure, track, and manage complex, long-term research projects using professional methodologies like portfolio management and advanced issue tracking that seamlessly roll up across their thousands of projects.\n\n* **Enhanced visibility:** Features like improved dashboards and code previews directly in Markdown files dramatically streamline tracking and documentation review, reducing administrative friction for both instructors and students managing large project loads.\n\n## Comprehensive curriculum: From concepts to continuous delivery\n\nGitLab Ultimate is deeply integrated into the computer science curriculum, moving students beyond simple `git` commands to practical **DevSecOps implementation**.\n\n* **Git fundamentals:** Students begin by visualizing concepts using open-source tools to master Git concepts.\n\n* **Full CI/CD implementation:** Students use GitLab CI for rigorous **Test-Driven Development (TDD)** in their software projects. They learn to build, test, and perform quality assurance using unit and integration testing pipelines—core competency made seamless by the integrated platform.\n\n* **DevSecOps for research and documentation:** The university teaches students that DevSecOps principles are vital for all collaborative work. Inspired by earlier work in Delft, students manage and produce critical research documentation (PDFs from Markdown files) using GitLab, incorporating quality checks like linters and spell checks directly in the CI pipeline. This ensures high-quality, reproducible research output.\n\n* **Future-proofing security skills:** The GitLab Ultimate platform immediately positions the institution to incorporate advanced DevSecOps features like SAST and DAST scanning as their research and development code projects grow, ensuring students are prepared for industry security standards.\n\n## Accelerating open source contributions with GitLab Duo\n\nAccess to the full GitLab platform, including our AI capabilities, has empowered students to make impactful contributions to the wider open source community faster than ever before.\n\nTwo Master's students recently completed direct contributions to the GitLab product, adding the **ORCID identifier** into user profiles. Working on GitLab.com, they leveraged **GitLab Duo's AI chat and code suggestions** to navigate the codebase efficiently.\n\n***\"This would not have been possible without GitLab Duo,\" Daniel Le Berre notes. \"The AI features helped students, who might have lacked deep codebase knowledge, deliver meaningful contributions in just two weeks.\"***\n\nThis demonstrates how providing students with cutting-edge tools **accelerates their learning and impact**, allowing them to translate classroom knowledge into real-world contributions immediately.\n\n## Empowering open research and institutional control\n\nThe stability of the self-managed instance at Artois University is key to its success. This model guarantees **institutional control and stability** — a critical factor for long-term research preservation.\n\nThe institution's expertise in this area was recently highlighted in a major 2024 study led by CRIL, titled: \"[Higher Education and Research Forges in France - Definition, uses, limitations encountered and needs analysis](https://hal.science/hal-04208924v4)\" ([Project on GitLab](https://gitlab.in2p3.fr/coso-college-codes-sources-et-logiciels/forges-esr-en)). The research found that the vast majority of public forges in French Higher Education and Research relied on **GitLab**. This finding underscores the consensus among academic leaders that self-hosted solutions are essential for **data control and longevity**, especially when compared to relying on external, commercial forges.\n\n## Unlock GitLab Ultimate for your institution today\n\nThe success story of **Artois University's CRIL** proves the transformative power of the GitLab for Education program. By providing **free access to GitLab Ultimate**, we enable large-scale institutions to:\n\n1.  **Deliver a modern, integrated DevSecOps curriculum.**\n\n2.  **Support advanced, collaborative research projects with Ultimate planning features.**\n\n3.  **Empower students to make AI-assisted open source contributions.**\n\n4.  **Maintain institutional control and data longevity.**\n\nIf your academic institution is ready to equip its students and researchers with the complete DevSecOps platform and its most advanced features, we invite you to join the program.\n\nThe program provides **free access to GitLab Ultimate** for qualifying instructional and non-commercial research use cases.\n\n**Apply now [online](https://about.gitlab.com/solutions/education/join/).**\n",{"slug":762,"featured":31,"template":14},"artois-university-elevates-curriculum-with-gitlab-ultimate-for-education",{"promotions":764},[765,779,790],{"id":766,"categories":767,"header":769,"text":770,"button":771,"image":776},"ai-modernization",[768],"ai-ml","Is AI achieving its promise at scale?","Quiz will take 5 minutes or less",{"text":772,"config":773},"Get your AI maturity score",{"href":774,"dataGaName":775,"dataGaLocation":247},"/assessments/ai-modernization-assessment/","modernization assessment",{"config":777},{"src":778},"https://res.cloudinary.com/about-gitlab-com/image/upload/v1772138786/qix0m7kwnd8x2fh1zq49.png",{"id":780,"categories":781,"header":782,"text":770,"button":783,"image":787},"devops-modernization",[735,563],"Are you just managing tools or shipping innovation?",{"text":784,"config":785},"Get your DevOps maturity score",{"href":786,"dataGaName":775,"dataGaLocation":247},"/assessments/devops-modernization-assessment/",{"config":788},{"src":789},"https://res.cloudinary.com/about-gitlab-com/image/upload/v1772138785/eg818fmakweyuznttgid.png",{"id":791,"categories":792,"header":794,"text":770,"button":795,"image":799},"security-modernization",[793],"security","Are you trading speed for security?",{"text":796,"config":797},"Get your security maturity score",{"href":798,"dataGaName":775,"dataGaLocation":247},"/assessments/security-modernization-assessment/",{"config":800},{"src":801},"https://res.cloudinary.com/about-gitlab-com/image/upload/v1772138786/p4pbqd9nnjejg5ds6mdk.png",{"header":803,"blurb":804,"button":805,"secondaryButton":810},"Start building faster today","See what your team can do with the intelligent orchestration platform for DevSecOps.\n",{"text":806,"config":807},"Get your free trial",{"href":808,"dataGaName":54,"dataGaLocation":809},"https://gitlab.com/-/trial_registrations/new?glm_content=default-saas-trial&glm_source=about.gitlab.com/","feature",{"text":499,"config":811},{"href":58,"dataGaName":59,"dataGaLocation":809},1773350802096]