Free Service test files and sample generator
A systemd service unit. Generate valid .service sample files to test deployment tooling, config parsers and Linux packaging pipelines.
What is a .service file?
SERVICE: systemd Unit File. A systemd .service unit declares how a daemon starts, in [Unit], [Service] and [Install] sections. Deploying one changes how a machine boots, so a sample is safer than editing a live unit.
Why generate a test Service file?
- Test a deployment or configuration-management step that installs units.
- Verify a parser handles repeated directives such as Environment=.
- Check unit validation in CI without touching a running system.
How a .service file is identified
A .service file has no signature at the start. A text format has no identifying leading bytes, so the extension and the reported media type are the only claims about it until a parser actually reads it, which is why validating uploads by extension alone is unsafe.
How the size lands on the exact byte
The format allows comments, so the padding is comment lines, legal, inert, and visible if you open the file.
Negative testing with broken Service files
- Invalid. Identifiable, but wrong inside, so it fails during parsing.
- Corrupted. The leading bytes are destroyed. Same length as the valid file.
- Incomplete. Truncated part-way, so it is genuinely shorter.
- Empty. Chosen under Content rather than File Condition: valid structure, no data.
Which failure to reach for, and what to assert for each, is covered in how to make a corrupted file for testing. For upload limits and type checks see testing file upload validation, and for this format's encodings, UTF-16 and BOM test files.
Sample Service content
[Unit] Description=Software Test Data sample service [Service] Type=simple ExecStart=/bin/true [Install] WantedBy=multi-user.target
This shows the shape of the file. Your download is generated fresh at the size you choose, so the values will differ.
How to open and verify the file
Validate with `systemd-analyze verify file.service` on Linux.
Media type text/plain · extension .service · category Config & DevOps
Generate a .service file → · questions about sizes, privacy or cost are answered on the site FAQ.
Frequently asked questions about Service files
What identifies a .service file?
Nothing at the start of the file does. A text format has no identifying leading bytes, so the extension and the reported media type are the only claims about it until a parser actually reads it, which is why validating uploads by extension alone is unsafe.
How can a .service file be an exact number of bytes?
The format allows comments, so the padding is comment lines, legal, inert, and visible if you open the file.
Can I download several broken Service files at once?
Yes, select more than one File Condition and you get one ZIP containing a .service per condition, each named after its condition.
Can the Service file use UTF-16 or a byte-order mark?
Yes. .service is a text format, so it can be generated as UTF-8, UTF-8 with a byte-order mark, UTF-16 LE or UTF-16 BE. The body is shortened before re-encoding so the finished file still lands on the exact size you asked for. Note that a UTF-16 file always has an even byte count.
How do I open or verify the Service file?
Validate with systemd-analyze verify file.service on Linux.
Related Config & DevOps formats
ENV · INI · TOML · Dockerfile · gitignore · CONF · Properties · Makefile