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You can run an nginx web server as your own Linux user with one command: boxr run -d --name web -p 8080:80 nginx:latest. The workflow needs no root-owned daemon and no sudo for routine commands. That is the path described in the DEV Community tutorial by Ryo Tanaka (posted September 26; the year is not shown in the copy available to us). The tutorial describes Boxr as beta software in the 0.1.x series.
The steps below follow the tutorial’s account. We could not check the current Boxr project documentation or release notes, so confirm each command’s syntax and each requirement against the version you install by running boxr --help and reading the project’s own installation instructions.
What Boxr is, as the tutorial describes it
The tutorial presents Boxr as an OCI container engine written in Rust that runs rootless by default. It says the workflow has no root-owned daemon, no sudo for routine commands, and no setuid helper binaries.
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Rootlessness comes from a Linux user namespace. The tutorial explains that UID 0 inside the container maps to your own UID on the host. A process that appears as root inside the container therefore runs under your account on the host, not as host root.
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Before you start
- A Linux machine with user namespaces available. This is the only prerequisite the tutorial states. Its installation options are Homebrew and a shell installer; check the project’s release notes before assuming macOS support.
- Docker’s subordinate-ID requirements do not transfer. Docker’s Rootless mode documents
newuidmap,newgidmap, and at least 65,536 entries in/etc/subuidand/etc/subgid. Those are Docker’s requirements. Boxr’s own requirements are not confirmed here, so do not copy them into Boxr setup without the project saying so. - “No sudo” describes the routine workflow. Host configuration, such as kernel settings or subordinate-ID ranges, may still need an administrator once. Whether it does depends on your distribution.
Install and confirm the version
- Install Boxr using the route the project currently documents. The tutorial lists Homebrew and a shell installer.
- Run the version check:
boxr --versionThe tutorial’s release is in the 0.1.x series. If your output shows a different version, check the project’s documentation for changes before following the rest of this walkthrough.
Run your first container
- Start nginx in the background, name it
web, and publish container port 80 on host port 8080:boxr run -d --name web -p 8080:80 nginx:latestThe
-dflag detaches the container,--name webgives it a name you can reuse in later commands, and-p 8080:80maps host port 8080 to container port 80. The tutorial says Boxr pullsnginx:latestautomatically on first use. - Request the page from the host:
curl -s http://localhost:8080 | head -5A working server returns the opening lines of an HTML page. This confirms that the port mapping and nginx are both responding.
Inspect a running container
The tutorial introduces two commands for checking state. boxr ps lists running containers, and boxr logs web shows nginx’s startup output, which is the first place to look if the curl check fails.
boxr ps
boxr logs webBind mounts and file ownership
The tutorial’s second example mounts a host directory into a container and writes a file from inside it. Files written through a mount like this appear owned by your host user, so the tutorial avoids a later sudo chown.
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- Create a host directory for the mount:
mkdir -p ~/boxr-data - Start a container that mounts it read-write at
/data. Thesleep 3600command keeps the container alive for one hour, so run the next step within that window:boxr run -d --name files -v ~/boxr-data:/data:rw alpine sleep 3600 - Write a file from inside the container:
boxr exec files sh -c "echo hello > /data/greeting.txt" - Read the file from the host:
cat ~/boxr-data/greeting.txtConfirm ownership with
ls -l ~/boxr-data/greeting.txt. The owner should be your own user, which is the result the tutorial describes.
Port 8080 and low ports
The tutorial says Boxr’s user-space TCP proxy handles published ports without binding privileged ports, which is why its example uses 8080 rather than 80 on the host. Treat that as the tutorial’s claim until you have tested it. Publishing a host port below 1024 is the case to check if you need one.
Clean up
Stop and remove the example containers when you finish:
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boxr stop files && boxr rm files
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