Category Archives for "Docker Blog"

Docker Captain Take 5 – Ajeet Singh Raina

Docker Captains are select members of the community that are both experts in their field and are passionate about sharing their Docker knowledge with others. Today, we’re introducing “Docker Captains Take 5”, a regular blog series where we get a closer look at the Docker experts who share their knowledge online and offline around the world. A different Captain will be featured each time and we will ask them the same broad set of questions ranging from what their best Docker tip is to whether they prefer cats or dogs (personally, we like whales and turtles over here). To kick us off we’re interviewing Ajeet Singh Raina who has been a Docker Captain since 2016 and is a DevRel Manager at Redis Labs. He is based in Bangalore, India.  

How/when did you first discover Docker?

It was the year 2013 when I watched Solomon Hykes for the first time presenting “The Future of Linux Containers” at PyCon in Santa Clara. This video inspired me to write my first blog post on Docker and the rest is history.

What is your favorite Docker command?

The docker buildx CLI  is one of my favorite commands. It allows you to Continue reading

Docker Compose for Amazon ECS Now Available

Docker is pleased to announce that as of today the integration with Docker Compose and Amazon ECS has reached V1 and is now GA! 🎉

We started this work way back at the beginning of the year with our first step – moving the Compose specification into a community run project. Then in July we announced how we were working together with AWS to make it easier to deploy Compose Applications to ECS using the Docker command line. As of today all Docker Desktop users will now have the stable ECS experience available to them, allowing developers to use docker compose commands with an ECS context to run their containers against ECS.

As part of this we want to thank the AWS team who have helped us make this happen: Carmen Puccio, David Killmon, Sravan Rengarajan, Uttara Sridhar, Massimo Re Ferre, Jonah Jones and David Duffey.

Getting started with Docker Compose & ECS

As an existing ECS user or a new starter all you will need to do is update to the latest Docker Desktop Community version ( or greater) store your image on Docker Hub so you can deploy it (you can get started with Hub here Continue reading

Rate Limiting by the Numbers

As a critical part of Docker’s transition into sustainability, we’ve been gradually rolling out limits on docker pulls to the heaviest users of Docker Hub. As we near the end of the implementation of the rate limits, we thought we’d share some of the facts and figures behind our effort. Our goal is to ensure that Docker becomes sustainable for the long term, while continuing to offer developers 100% free tools to build, share, and run their applications.

We announced this plan in August with an effective date of November 1. We also shared that “roughly 30% of all downloads on Hub come from only 1% of our anonymous users,” illustrated in this chart:

This shows the dramatic impact that a very small percentage of anonymous, free users have on all of Docker Hub. That excessive usage by just 1%–2% of our users results not only in an unsustainable model for Docker but also slows performance for the other 98%–99% of the 11.3 million developers, CI services, and other platforms using Docker Hub every month. Those developers rely upon us to save and share their own container images, as well as to pull images from Docker Verified Publishers Continue reading

Apple Silicon M1 Chips and Docker

Revealed at Apple’s ‘One More Thing’ event on Nov 10th, Docker was excited to see new Macs feature Apple silicon and their M1 chip. At Docker we have been looking at the new hypervisor features and support that are required for Mac to continue to delight our millions of customers. We saw the first spotlight of these efforts at Apple WWDC in June, when Apple highlighted Docker Desktop on stage. Our goal at Docker is to provide the same great experience on the new Macs as we do today for our millions of users on Docker Desktop for Mac, and to make this transition as seamless as possible. 

Building the right experience for our customers means getting quite a few things right before we push a release. Although Apple has released Rosetta 2 to help move applications over to the new M1 chips, this does not get us all the way with Docker Desktop. Under the hood of Docker Desktop, we run a virtual machine, to achieve this on Apple’s new hardware we need to move onto Apple’s new hypervisor framework. We also need to do all the plumbing that provides the core experience of Docker Continue reading

Taking Your App Live with Docker and the Uffizzi App Platform

Tune in December 10th 1pm EST for our
Live DockTalk:  Simplify Hosting Your App in the Cloud with Uffizzi and Docker

We’re excited to be working with Uffizzi on this joint blog.  Docker and Uffizzi have very similar missions that naturally complement one another.  Docker helps you bring your ideas to life by reducing the complexity of application development and Uffizzi helps you bring your ideas to life by reducing the complexity of cloud application hosting. 

This blog is a step-by-step guide to setting up automated builds from your Github repo via Docker Hub and enabling Continuous Deployment to your Uffizzi app hosting environment.

To complete this tutorial, you will need the following:

Docker Overview

Docker is an open platform for developing, shipping, and running applications. Docker containers separate your applications from your infrastructure so you can deliver software quickly. 

With Docker, you can manage your infrastructure in the same ways you manage your applications. By Continue reading

Rate Limiting Questions? We have answers

As we have been implementing rate limiting on Docker Hub for free anonymous and authenticated image pulls, we’ve heard a lot of questions from our users about how this will affect them. And we’ve also heard a number of statements that are inaccurate or misleading about the potential impacts of the change. We want to provide some answers here to help Docker users clearly understand the changes, quantify what is involved, and help developers choose the right Docker subscription for their needs.

First let’s look at the realities of what rate limiting looks like, and quantify what is still available for free to authenticated Docker users. Anyone can use a meaningful number of Docker Hub images for free. Anonymous, unauthenticated Docker users get 100 container pull requests per six hours. And when a user signs up for a free Docker ID, they get 2X the quantity of pulls. At 200 pulls per six hours, that is approximately 24,000 container image pulls per month per free Docker ID. This egress level is adequate for the bulk of the most common Docker Hub usage by developers. (Docker users can check their usage levels at any time through the command line. Docker developer Continue reading

Combining Snyk Scans in Docker Desktop and Docker Hub to Deploy Secure Containers

Last week, we announced that the Docker Desktop Stable release includes vulnerability scanning, the latest milestone in our container security solution that we are building with our partner Snyk. You can now run Snyk vulnerability scans directly from the Docker Desktop CLI.  Combining this functionality with Docker Hub scanning functionality that we launched in October provides you with the flexibility of including vulnerability scanning along multiple points of your development inner loop, and provides better tooling for deploying secure applications.

You can decide if you want to run your first scans from the Desktop CLI side, or from the Hub.  Customers that have used Docker for a while tend to prefer starting from the Hub. The easiest way to jump in is to configure the Docker Hub repos to automatically trigger scanning every time that you push an image into that repo. This option is configurable for each repository, so that you can decide how to onboard these scans into your security program. (Docker Hub image is available only for Docker Pro and Team subscribers, for more information about subscriptions visit the Docker Pricing Page.)

Once you enable scanning, you can view the scanning results either Continue reading

Compose CLI ACI Integration Now Available

Today we are pleased to announce that we have reached a major milestone, reaching GA and our V1 of both the Compose CLI and the ACI integration. 🎉

In May we announced the partnership between Docker and Microsoft to make it easier to deploy containerized applications from the Desktop to the cloud with Azure Container Instances (ACI). We are happy to let you know that all users of Docker Desktop now have the ACI experience available to them by default, allowing them to easily use existing Docker commands to deploy and manage containers running in ACI. 

As part of this I want to also call out a thank you to the MSFT team who have worked with us to make this all happen! That is a big thank you to Mike Morton, Karol Zadora-Przylecki, Brandon Waterloo, MacKenzie Olson, and Paul Yuknewicz.

Getting started with Docker and ACI 

As a new starter, to get going all you will need to do is upgrade your existing Docker Desktop to the latest stable version ( or later), store your image on Docker Hub so you can deploy it (you can get started with Hub here) and then lastly you Continue reading

Updates on Hub Rate Limits, Partners and Customer Exemptions

The gradual enforcement of the Docker Hub progressive rate limiting enforcement on container image pulls for anonymous and free users began Monday, November 2nd. The next three hour enforcement window on Wednesday, November 4th from 9am to 12 noon Pacific time. During this window, the eventual final limit of 100 container pull requests per six hours for unauthenticated users and 200 for free users with Docker IDs will be enforced. After that window, the limit will rise to 2,500 container pull requests per six hours. 

As we implement this policy, we are looking at the core technologies, platforms and tools used in app pipelines to ensure a transition that supports developers across their entire development lifecycle. We have been working with leading cloud platforms, CI/CD providers and other ISVs to ensure their customers and end users who use Docker have uninterrupted access to Docker Hub images. Among these partners are the major cloud hosting providers, CI/CD vendors such as CircleCI, and OSS entities such as Apache Software Foundation (ASF). You can find more information about programs on our Pricing Page as well as links to contact us for information about programs for ISVs and companies with more than 500 Continue reading

Expanded Support for Open Source Software Projects

Docker remains committed to providing a platform where the non-commercial open source developers can continue collaborating, innovating and pushing this industry into new directions.  

In August, we announced to our dedicated community and ecosystem that we are creating new policies for image retention and data pull rates. We made these changes to make Docker a sustainable business for the long term, so that we can continue supporting the developer community and ecosystem that depends on the Docker platform. We got great feedback from our extensive user base, and adjusted our policies to delay the policies on image retention until mid-2021. The plan for data pull rates is moving forward, and starting today limits will be gradually enforced, with the plan to be fully applied in the coming weeks. The final limits will be:

  • Unauthenticated users will be restricted to 100 pulls every 6 hours
  • Authenticated free users will be restricted to 200 pulls every 6 hours

To support the open source community, Docker has created a special program for Open Source projects to get continued free access and freedom from restrictions for their communities and their users. For the approved, non-commercial, open source projects, we are thrilled to announce Continue reading

Pro and Team Subscriptions Embrace Docker Desktop

About a month ago we talked about how we planned to make Docker Desktop more first class as part of our Pro and Team subscriptions. Today we are pleased to announce that with the latest release of Docker Desktop we are launching support for Docker Desktop for Pro and Team users. This means that customers on Pro plans or team members on Team plans will be able to get support outside of the community support in our Github repository, this will include installation support, issues in running Desktop and of course the existing support for Docker Hub. 

Along with this, we have our first Pro feature available in Docker Desktop! For Pro and Team users who have scanning enabled in Docker Hub, you will be able to see your scan results directly in the Docker Dashboard. 

This is the first step in releasing unique features for Pro and Team users on Docker Desktop.

Along with this we are pleased to announce that in Docker Desktop 2.5 we have the GA release of the docker scan CLI powered by Snyk! To find out more about scanning images locally have a read of Marina’s blog post. 

For customers Continue reading

What you need to know about upcoming Docker Hub rate limiting

On August 13th, we announced the implementation of rate limiting for Docker container pulls for some users. Beginning November 2, Docker will begin phasing in limits of Docker container pull requests for anonymous and free authenticated users.  The limits will be gradually reduced over a number of weeks until the final levels (where anonymous users are limited to 100 container pulls per six hours and free users limited to 200 container pulls per six hours) are reached. All paid Docker accounts (Pro, Team or Legacy subscribers) are exempt from rate limiting. 

The rationale behind the phased implementation periods is to allow our anonymous and free tier users and integrators to see the places where anonymous CI/CD processes are pulling container images. This will allow Docker users to address the limitations in one of two ways:  upgrade to an unlimited Docker Pro or Docker Team subscription,  or adjust application pipelines to accommodate the container image request limits.  After a lot of thought and discussion, we’ve decided on this gradual, phased increase over the upcoming weeks instead of an abrupt implementation of the policy. An up-do-date status update on rate limitations is available at

Docker users Continue reading

Checking Your Current Docker Pull Rate Limits and Status

Continuing with our move towards consumption-based limits, customers will see the new rate limits for Docker pulls of container images at each tier of Docker subscriptions starting from November 2, 2020. 

Anonymous free users will be limited to 100 pulls per six hours, and authenticated free users will be limited to 200 pulls per six hours. Docker Pro and Team subscribers can pull container images from Docker Hub without restriction as long as the quantities are not excessive or abusive.

In this article, we’ll take a look at determining where you currently fall within the rate limiting policy using some command line tools.

Determining your current rate limit

Requests to Docker Hub now include rate limit information in the response headers for requests that count towards the limit. These are named as follows:

  • RateLimit-Limit    
  • RateLimit-Remaining

The RateLimit-Limit header contains the total number of pulls that can be performed within a six hour window. The RateLimit-Remaining header contains the number of pulls remaining for the six hour rolling window. 

Let’s take a look at these headers using the terminal. But before we can make a request to Docker Hub, we need to obtain a bearer token. We will then Continue reading

Setting Up Cloud Deployments Using Docker, Azure and Github Actions

A few weeks ago I shared a blog about how to use GitHub Actions with Docker, prior to that Guillaume has also shared his blog post on using Docker and ACI. I thought I would bring these two together to look at a single flow to go from your code in GitHub all the way through to deploying on ACI using our new Docker to ACI experience!

To start, let’s remember where we were with our last Github action. Last time we got to a point where our builds to master would be re-built and pushed to Docker Hub (and we used some caching to speed these up).  

name: CI to Docker Hub
     - "v*.*.*"
   runs-on: ubuntu-latest
       name: Checkout
       uses: actions/[email protected]
       name: Set up Docker Buildx
       id: buildx
       uses: docker/[email protected]
       name: Cache Docker layers
       uses: actions/[email protected]
         path: /tmp/.buildx-cache
         key: ${{ runner.os }}-buildx-${{ github.sha }}
         restore-keys: |
           ${{ runner.os }}-buildx-
       uses: docker/[email protected]
         username: ${{ secrets.DOCKER_USERNAME }}
         password: ${{ secrets.DOCKER_PASSWORD }}
       name: Build and push
       id: docker_build
       uses: docker/[email protected]
         context: ./
         file: ./Dockerfile
         builder: ${{  Continue reading

Docker’s Next Chapter: Our First Year

2020 has been quite the year. Pandemic, lockdowns, virtual conferences and back-to-back Zoom meetings. Global economic pressures, confinement and webcams aside, we at Docker have been focused on delivering what we set out to do when we announced Docker’s Next Chapter: Advancing Developer Workflows for Modern Apps last November 2019. I wish to thank the Docker team for their “can do!” spirit and efforts throughout this unprecedented year, as well as our community, our Docker Captains, our ecosystem partners, and our customers for their non-stop enthusiasm and support. We could not have had the year we had without you.

This next chapter is being jointly written with you, the developer, as so much of our motivation and inspiration comes from your sharing with us how you’re using Docker. Consider the Washington University School of Medicine (WUSM): WUSM’s team of bioinformatics developers uses Docker to build pipelines – consisting of up to 25 Docker images in some cases – for analyzing the genome sequence data of cancer patients to inform diagnosis and treatments. Furthermore, they collaborate with each other internally and with other cancer research institutions by sharing their Docker images through Docker Hub. In the words of WUSM’s Dr. Continue reading

Docker V2 Github Action is Now GA

Docker is happy to announce the GA of our V2 Github Action. We’ve been working with @crazy-max over the last few months along with getting feedback from the wider community on how we can improve our existing Github Action. We have now moved from our single action to a clearer division and advanced set of options that not only allow you to just build & push but also support features like multiple architectures and build cache.

The big change with the advent of our V2 action is also the expansion of the number of actions that Docker is providing on Github. This more modular approach and the power of Github Actions has allowed us to make the minimal UX changes to the original action and add a lot more functionality.

We still have our more meta build/push action which does not actually require all of these preconfiguration steps and can still be used to deliver the same workflow we had with the previous workflow! To Upgrade the only changes are that we have split out the login to a new step and also now have a step to setup our builder. 

        name: Setup Docker Buildx
        uses: docker/[email protected]

This Continue reading

Docker Hub Image Retention Policy Delayed, Subscription Updates

Today we are announcing that we are pausing enforcement of the changes to image retention until mid 2021. Two months ago, we announced a change to Docker image retention policies to reduce overall resource consumption. As originally stated, this change, which was set to take effect on November 1, 2020, would result in the deletion of images for free Docker account users after six months of inactivity. After this announcement, we heard feedback from many members of the Docker community about challenges this posed, in terms of adjusting to the policy without visibility as well as tooling needed to manage an organization’s Docker Hub images. Today’s announcement means Docker will not enforce image expiration enforcement on November 1. Instead, Docker is focusing on consumption-based subscriptions that meet the needs of all of our customers. In this model, as the needs of a developer grow, they can upgrade to a subscription that meets their requirements without limits.

This change means that developers will get a base level of consumption to start, and can extend their subscriptions as their needs grow and evolve, only paying for what is actually needed. The community of 6.7 million registered Docker developers is incredibly diverse–the Continue reading

Understanding Inner Loop Development and Pull Rates

We have heard feedback that given the changes Docker introduced relating to network egress and the number of pulls for free users, that there are questions around the best way to use Docker as part of your development workflow without hitting these limits. This blog post covers best practices that improve your experience and uses a sensible consumption of Docker which will mitigate the risk of hitting these limits and how to increase the limits depending on your use case. 

If you are interested in how these limits are addressed in a CI/CD pipeline, please have a look at our post: Best Practices for using Docker Hub for CI/CD. If you are using Github Action, have a look at our Docker Github Actions post.


To complete this tutorial, you will need the following:

Determining Number of Pulls

Docker defines pull rate limits as the number of manifest requests to Docker Hub. Rate limits for Docker pulls are based Continue reading

Docker and Snyk Extend Partnership to Docker Official and Certified Images

Today we are pleased to announce that Docker and Snyk have extended our existing partnership to bring vulnerability scanning to Docker Official and certified images. As the exclusive scanning partner for these two image categories, Snyk will work with Docker to provide developers with insights into our most popular images. It builds on our previous announcement earlier this year where Snyk scanning was integrated into the Docker Desktop and Docker Hub. This means that developers can now incorporate vulnerability assessment along each step of the container development and deployment process.

Docker Official images represent approximately 25% of all of the pull activity on Docker Hub. Docker Official images are used extensively by millions of developers and developer world wide teams to build and run tens of millions of containerized applications. By integrating vulnerability scanning from Snyk users are now able to get more visibility into the images and have a higher level of confidence that their applications are secure and ready for production.

Docker Official images that have been scanned by Snyk will be available early next year.

You can read more about it from Snyk here and you can catch Docker CEO Scott Johnson and Snyk CEO Peter McKay Continue reading

Docker at SnykCon 2020

We are excited to be a gold sponsor of the inaugural SnykCon virtual conference, a free online event from Snyk taking place this week on October 21-22, 2020. The conference will look at best practices and technologies for integrating development and security teams, tools, and processes, with a specific nod of the secure use of containers, from images used as a starting point to apps shared with teams and the public.

At Docker, we know that security is vital to successful app development projects, and automating app security early in the development process ensures teams start with the right foundation and ship apps that have vulnerability scanning and remediation included by default. This year we announced a broad partnership with Snyk to incorporate their leading vulnerability scanning across the entire Docker app development lifecycle. At Snykcon, attendees will learn how to successfully incorporate security scanning into their entire Docker app delivery pipeline.

Some of the highlights from Docker at this event include:

  • Docker CEO Scott Scott Johnston will join Snyk CEO Peter McKay in the keynote fireside chat on Thursday, October 22 at 8:30am PDT. Scot and Peter will talk about the partnership between Docker and Snyk and share Continue reading
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