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A developer’s October 22, 2026, blog post describes lessons from starting a personal container-runtime project, including how containers rely on Linux processes and kernel features rather than a separate container object. The post also discusses image filesystems, runc’s use of Go, and root privileges; it is a first-person technical account, not an announcement of a Docker change.
A developer building a container runtime as a personal project has published an account of what they learned about Docker, describing containers as ordinary Linux processes restricted by several kernel features rather than as miniature virtual machines. The post, published on October 22, 2026, offers a hands-on explanation of Docker and runc internals, but does not report a change to Docker or a new release.
The author’s central point is that a Linux container is still a process running under the host kernel. Linux does not provide one single feature called “containers”; instead, container runtimes combine mechanisms. The post identifies namespaces, which separate what processes can see, and control groups, which limit resource use, alongside networking and other setup.
The article also describes container images as filesystem contents arranged for a process to use as its root directory. In the author’s simplified example, Docker obtains an Ubuntu image, places its files in storage, and starts a shell using that filesystem, with root-directory setup involving mechanisms such as chroot or pivot_root. This account is an overview, not a complete description of Docker’s image and container lifecycle.
On implementation, the author says Docker’s low-level runtime, runc, is written in Go. They describe a complication: some system calls involved in setting up a container need to run in a single-threaded context, while Go’s runtime uses multiple threads. The post says runc uses a C component before Go’s runtime initializes for some of this work, and uses execution of /proc/self/exe with a special argument to create a child-process path rather than relying on a conventional Go fork.
How Linux Builds a Container
The explanation matters because it corrects a common mental model: containers can look like compact virtual machines to users, but the author describes them as isolated processes sharing the host’s Linux kernel. That distinction helps readers understand both what containerization provides and why it is not the same boundary as running a separate guest operating system.
It also makes clear that container behavior depends on several layers working together: process isolation, resource limits, filesystem setup and networking. Those details are relevant to developers diagnosing runtime behavior or thinking about security. The post does not establish that Docker is unsafe; rather, the author says the mechanisms and privileges involved make container security a difficult area.
The account’s value is educational rather than a product announcement. By building a runtime, the author is learning how familiar commands are implemented beneath the interface. Their observations can help readers ask more precise questions about which kernel features are in use and what a particular runtime does.
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From Docker Commands to Kernel Features
Docker lets users start applications from images through commands such as docker run. That interface conceals work performed by Docker components and lower-level runtime software. The author uses the example of running an Ubuntu shell to connect the visible command with image retrieval, filesystem preparation and process launch.
The post also raises privilege and networking. The author says Docker commonly involves a root-running daemon on Linux, reflecting kernel operations that require elevated privileges or historically have done so. They note that their experience running Docker on macOS can obscure this, since Docker there operates through a Linux environment rather than directly using the Mac kernel for Linux containers. The author says rootless operation has improved, while suggesting networking can require user-space handling to provide comparable features. These are the author’s observations, not a full comparison of current runtime implementations.
“Containers aren’t real”
— The developer, in the Code and Cake post
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What the Early Account Leaves Open
The developer says they have only just started building their own runtime. The post does not describe a completed implementation, publish comparative tests, or show that the project is ready for others to use. It also does not provide a detailed technical review of every Docker component or runtime configuration.
Some of the security and rootless-runtime discussion is expressly tentative. The author says they can “only imagine” container security is difficult and describes networking as an apparent exception for rootless runtimes. The post does not name a specific runtime setup, enumerate networking features, or establish that all rootless implementations work the same way. Those details should be treated as the author’s current understanding, not universal findings.
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The Runtime Project’s Next Steps
The author says the personal runtime project is still in its early stages and offers no announced release date or planned feature list. The next development is therefore whether they continue the project and publish further findings. Readers seeking implementation-specific conclusions will need more detail from the author or documentation for the particular Docker and runtime versions they use.
For now, the post is best read as a developer’s learning report: it explains several mechanisms behind container execution while leaving the project’s eventual scope and technical results open.
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Key Questions
Did Docker announce a new product or change?
No. The source is a personal technical post about a developer’s early effort to build a container runtime. It does not announce a Docker release or policy change.
Are containers virtual machines?
Not in the account’s explanation. A Linux container runs as a process on the host kernel, with isolation and resource controls supplied by kernel features. That differs from a virtual machine, which runs a guest operating system.
What does the post say Docker uses to isolate containers?
It names Linux namespaces for separating what processes can see and control groups for limiting resource use, as well as networking mechanisms and other setup.
The post says the project is at an early stage and does not provide a release announcement or evidence that it is ready for general use.
Source: hn
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