Docker For Mac Needs Privileged Access

I searched for hours to find a flyer maker / illustration software, after the one that came standard on my Mac would not function. It wasn’t until I found this app that I was able to make a nice flyer for a benefit to help a child born with a rare and serious congenital disorder. This app helped me to create promotional material to potentially help raise money for this infant who is fighting to survive. Free desktop publishing software for mac.

One of the (many!) features of Docker 0.6 is the new “privileged” mode for containers. It allows you to run some containers with (almost) all the capabilities of their host machine, regarding kernel features and device access. Among the (many!) possibilities of the “privileged” mode, you can now run Docker within Docker itself. First, we will see how to make that happen; next, we will explain what is involved under the hood, and finally, we will show something even more powerful than Docker in Docker!

Docker for Mac was released in 2016 as a native app that keeps itself updated. If the “Docker needs privileged access” pop-up appears, click OK and type it in, then dismiss the pop-up. Docker Setup; Docker Build. Maven on MacOSX. SonarQube static code scan. At the Docker needs privileged access. Prompt, click OK. At the Docker wants to make changes. Prompt, fill in your administrative user credentials and click OK. Docker should now be running in the taskbar tray. Open the Docker menu by clicking: After a minute or two, you should see Docker is running with a green circle.

See Docker-in-Docker in action If you have Docker 0.6, all you have to do is. Docker run -t -i ubuntu bash Note how the container ID changes as you transition from the container running Docker, to the innermost container! What’s special in my dind image? Almost nothing! It is built with a regular. Let’s see what is in that Dockerfile. First, it installs a few packages: lxc and iptables (because Docker needs them), and ca-certificates (because when communicating with the Docker index and registry, Docker needs to validate their SSL certificates).

The Dockerfile also indicates that /var/lib/docker should be a volume. This is important, because the filesystem of a container is an AUFS mountpoint, composed of multiple branches; and those branches have to be “normal” filesystems (i.e. Not AUFS mountpoints). In other words, /var/lib/docker, the place where Docker stores its containers, cannot be an AUFS filesystem. Therefore, we instruct Docker that this path should be a volume. Volumes have many purposes, but in this scenario, we use them as a pass-through to the “normal” filesystem of the host machine. The /var/lib/docker directory of the nested Docker will live somewhere in /var/lib/docker/volumes on the host system.

And of course, the Dockerfile injects the Docker binary in the image, as well as a. The helper script deals with three things. It ensures that the cgroup pseudo-filesystems are properly mounted, because Docker (or, more accurately, lxc-start) needs them. It closes extraneous file descriptors which might have been leaked from the parent process. This is not strictly necessary, but you might notice weird side effects if you don’t do it; so I took care of it for you. It checks if you specified a PORT environment variable through the -e PORT=. Command-line option.

If you did, the Docker daemon starts in the foreground, and listens for API requests on the specified TCP port. If you did not specify a PORT variable, it will start Docker in the background, and give you an interactive shell. In the next section, I’ll tell you why I think that this PORT environment variable can be very useful.

Docker-as-a-Service If you just want to experiment with Docker-in-Docker, just start the image interactively, as shown above. Now, let’s pretend that you want to provide Docker-as-a-Service. I’m not speaking about Containers-as-a-Service here, but whole Docker instances.

Well, each time someone wants their own private Docker instance, just run this. Docker run -privileged -d -p 1234 -e PORT=1234 jpetazzo/dind Then use docker inspect to retrieve the public port allocated to that container, and give it to your user. They will be able to create containers on this “private Docker” by pointing their Docker client to the IP address and port that you gave them. (See for a similar example.) Note, however, that there are serious security implications there: since the private Docker instances run in privileged mode, they can easily escalate to the host, and you probably don’t want this! If you really want to run something like this and expose it to the public, you will have to fine-tune the LXC template file, to restrict the capabilities and devices available to the Docker instances. In the future, Docker will allow fine-grained permission management; but for now, we think that the ability to switch between “locked down” and “privileged” is a great first step. Docker-in-Docker-in-Docker-in Can I Run Docker-in-Docker-in-Docker?

When you are inside a privileged container, you can always nest one more level. Docker run -t -i -privileged jpetazzo/dind And in the resulting container, you can repeat the process, ad lib.

Also, as you exit nested Docker containers, this will happen (note the root prompts): root@975423921ac5:/# exit root@6b2ae8bf2f10:/# exit root@419a67dfdf27:/# exit root@bc9f450caf22:/# exit jpetazzo@tarrasque:/Work/DOTCLOUD/dind$ At that point, you should blast Hans Zimmer’s on your loudspeakers while twirling a spinning top 😀 It doesn’t work! While testing Docker-in-Docker in various environments, I found two possible problems. It looks like the LXC tools cannot start nested containers if the devices control group is not in its own hierarchy. Check the content of /proc/1/cgroup: if devices is standing on a line on its own, you’re good. If you see that another control group is on the same line, Docker-in-Docker won’t work.

The wrapper script will detect this situation and issue a warning. To work around the issue, you should stop all running containers, unmount all the control groups, and remount them one by one, each in its own hierarchy. Also, if you use AppArmor, you need a special policy to support nested containers. If Docker-in-Docker doesn’t work, check your kernel log (with dmesg); if you see messages related to AppArmor, you can start Docker in unconfined mode, like this: docker run -privileged -lxc-conf='aaprofile=unconfined' -t -i dind Take Me To Your Repo The Dockerfile, the wrapper, and some extra documentation is available on my github repository:. By Jerome is a senior engineer at Docker, where he rotates between Ops, Support and Evangelist duties. In another life he built and operated Xen clouds when EC2 was just the name of a plane, developed a GIS to deploy fiber interconnects through the French subway, managed commando deployments of large-scale video streaming systems in bandwidth-constrained environments such as conference centers, and various other feats of technical wizardry. When annoyed, he threatens to replace things with a very small shell script.

21 Responses to “Docker can now run within Docker”. Charles Duffy Hmm.

This is the first in a series of articles we are publishing to provide more details on Docker Desktop Enterprise, which we announced at DockerCon Barcelona. Keep up with the latest Docker Desktop Enterprise news and release updates by signing up for the Docker Desktop Enterprise announcement list. Docker’s engineers have been hard at work completing features and getting everything in ship-shape (pun intended) following our announcement of Docker Desktop Enterprise, a new desktop product that is the easiest, fastest and most secure way to develop production-ready containerized applications and the easiest way for developers to get Kubernetes running on their own machine. In the first post of this series I want to highlight how we are working to bridge the gap between development and production with Docker Desktop Enterprise using our new Version Packs feature.

Version Packs let you easily swap your. As the world celebrates Valentine’s Day, at Docker, we are celebrating what makes our heart all aflutter – gearing up for an amazing DockerCon with the individuals and organizations that make up the Docker community. With that, we are thrilled to announce our first speakers for DockerCon San Francisco, April 29 – May 2. DockerCon fan favorites like Liz Rice, Bret Fisher and Don Bauer are returning to the conference to share new insights and experiences to help you better learn how to containerize.

And we are excited to welcome new speakers to the DockerCon family including Ana Medina, Tommy Hamilton and Ian Coldwater to talk chaos engineering, building your production container platform stack and orchestration with Docker Swarm and Kubernetes. And we’re just getting started! This year DockerCon is going to bring more technical deep dives, practical how-to’s, customer case studies and inspirational stories. Stay. On Monday, February 11, Docker released an update to fix a privilege escalation vulnerability (CVE-2019-5736) in runC, the Open Container Initiative (OCI) runtime specification used in Docker Engine and containerd.

This vulnerability makes it possible for a malicious actor that has created a specially-crafted container image to gain administrative privileges on the host. Docker engineering worked with runC maintainers on the OCI to issue a patch for this vulnerability. Docker recommends immediately applying the update to avoid any potential security threats. For Docker Engine-Community, this means updating to 18.09.2 or 18.06.2. For Docker Engine- Enterprise, this means updating to 18.09.2, 18.03.1-ee-6, or 17.06.2-ee-19.

Read the release notes before applying the update due to specific instructions for Ubuntu and RHEL operating systems. For Docker Desktop, users should download the update for Mac or Windows.

Summary of the Docker Engine versions that address the vulnerability: Docker Engine. Docker is pleased to announce support within the Docker Enterprise container platform for the Windows Server 2019 Long Term Servicing Channel (LTSC) release and the Server 1809 Semi-Annual Channel (SAC) release.

Windows Server 2019 brings the range of improvements that debuted in the Windows Server 1709 and 1803 SAC releases into a LTSC release preferred by most customers for production use. The addition of Windows Server 1809 brings support for the latest release for customers who prefer to work with the Semi-Annual Channel. As with all supported Windows Server versions, Docker Enterprise enables Windows Server 2019 and Server 1809 to be used in a mixed cluster alongside Linux nodes. Windows Server 2019 includes the following improvements: Ingress routing VIP service discovery Named pipe mounting Relaxed image compatibility requirements Smaller base image sizes Docker and Microsoft: A Rich History of. If you can only attend one conference this year – make it matter.

DockerCon is the one-stop event for practitioners, contributors, maintainers, developers, and the container ecosystem to learn, network and innovate. And this year, we will continue to bring you all the things you love about DockerCon like Docker Pals, the Hallway Track and roundtables, and the sessions and content you wanted more of – including open source, transformational, and practical how-to talks. Take advantage of our lowest ticket price when you register by January 31, 2019. No codes required.

And in case you are still not convinced, here are a few more reasons you shouldn’t miss this year’s DockerCon Belong.The Docker Community is one of a kind and the best way to feel a part of it is at DockerCon. Take advantage the Docker Pals Program, Hallway Track. In just over one year, Microsoft support for Windows Server 2008 will come to an end. Without the proper planning in place, the ripple effects may impact your business. The cost of maintenance will skyrocket, while security and compliance risks will increase without regular patches.

So, how can companies beat the clock? The short answer is enterprise container platforms can provide a fast and simple way to transform expensive and difficult-to-maintain applications into efficient, secure and portable applications ready for modern infrastructure – whether current Windows Server releases (such as WS 2016 or later) and/or into the cloud. Taking this approach saves a significant amount of money and improves security and performance across the application lifecycle. We are already seeing immediate demand from customers in modernizing their existing Windows Server applications in preparation for the end of support in January. The Docker community has been at the heart of Docker’s success from the start. We are constantly in awe of the dedication and passion of the practitioners – users, customers, partners, contributors and maintainers – who make up our community. Early in December at DockerCon Barcelona we were humbled to honor a Docker Captain and a few very special Community Leaders whose activities over the past year have made a tremendous difference to us all.

Together, the Docker Community has achieved so much, we can’t wait to see what 2019 has in store. Tip of the Captains Hat Award Bret Fisher Docker Captain (and Community Leader) Bret Fisher was nominated to receive this inaugural award by his fellow Captains because his contribution and leadership serve as an example of what it means to be a Docker Captain. All this week we’ve been bringing you the top 5 blog posts for 2018 –coming in at #1 is our post on open sourcing our Docker Compose on Kubernetes capability. This new capability enables you to simplify the Kubernetes experience. To learn more, continue reading Today we’re happy to announce we’re open sourcing our support for using Docker Compose on Kubernetes. We’ve had this capability in Docker Enterprise for a little while but as of today you will be able to use this on any Kubernetes cluster you choose. Why do I need Compose if I already have Kubernetes? The Kubernetes API is really quite large.

There are more than 50 first-class objects in the latest release, from Pods and Deployments to ValidatingWebhookConfiguration and ResourceQuota. This can lead to a verbosity in configuration, which then needs to be managed.