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Reprepro lets you host a private Debian package archive on a VPS while keeping the repository metadata signed. The secure pattern is to keep the signing key and Reprepro’s internal directories private, publish only the generated repository tree over HTTPS, and give clients a scoped key through APT’s signed-by option.
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What Reprepro does—and what a secure deployment must protect
Reprepro creates and manages a Debian package repository that clients can use through the normal APT workflow. It stores package files in a pool hierarchy, maintains distribution metadata, and signs the generated index information with OpenPGP. Debian describes it as particularly suitable for an individual package archive or “PPA”-style repository.
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- Public repository data: the
dists/metadata tree, thepool/package tree, and the exported public signing key. - Administrative data: the
conf/configuration directory, thedb/database directory, and the OpenPGP secret key.
Only the first category should be available through the web server. APT verifies signed metadata, but HTTPS still matters during key bootstrap: without HTTPS, an attacker could replace the public key while a client is downloading it and then present a repository signed by the attacker’s key.
The design below uses /srv/repo as the repository base, repo.example.com as its hostname, and the Debian bookworm codename. Replace those values with your own stable names before deploying.
Plan the repository before installing anything
Choose the codename and suite deliberately
Reprepro identifies a distribution block by its Codename. That value should remain stable for the lifetime of the repository. The Suite is the moving label clients may use for a release channel such as stable or testing. If you change the suite label while retaining the same codename, clients can continue referring to the stable codename while the channel moves according to your release policy.
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| Setting | Example | Purpose |
|---|---|---|
Codename |
bookworm |
Stable identifier used by Reprepro commands and APT source entries. |
Suite |
stable |
Release-channel label; it can move independently of the codename. |
Architectures |
amd64 arm64 source |
Indexes and packages to publish. |
Components |
main |
Component names clients place in their APT source line. |
SignWith |
your full key fingerprint | OpenPGP key used to sign generated Release metadata. |
Origin, Label, Description |
Project-specific values | Human-readable identity shown in repository metadata. |
Separate administration from publication
Use a dedicated repository account or another tightly restricted administrative account for Reprepro operations. The account that owns the repository database and configuration should not be the account used by the web server to serve files. Uploaders should receive a controlled upload path rather than shell access to the public document root.
Keep the signing workstation, or at least the secret-key material, separate from the nginx document root. The VPS can perform exports while the secret key remains in a restricted administrative account, but never place the secret key under a path that the web server can publish.
Install Reprepro and create the private tree
Install the required packages
On a Debian VPS, refresh APT and install Reprepro, GnuPG, and nginx:
sudo apt update
sudo apt install reprepro gnupg nginxThe following directory command creates the configuration directory with restrictive permissions and assigns it to a reprepro account and group:
sudo install -d -m 0750 -o reprepro -g reprepro /srv/repo/confThe account and group names are deployment choices. If your system uses a different dedicated account, substitute it consistently for ownership, command execution, and permissions. Create the repository’s db/, dists/, and pool/ content through Reprepro rather than making the internal database publicly writable.
Check ownership and web-server boundaries
Before publishing anything, verify that the administrative account can write the repository and that nginx cannot read the internal configuration or database paths through HTTP. The web server needs read access to generated public files, not write access to the repository and not access to the secret key.
A practical boundary is:
/srv/repo/conf/: Reprepro configuration; private./srv/repo/db/: Reprepro database; private./srv/repo/pool/: package files; public after validation./srv/repo/dists/: signed metadata; public after validation./srv/repo/repository-key.asc: exported public key; public over HTTPS.
Create and protect the OpenPGP signing key
Generate the key in a controlled account
Create the OpenPGP key using a controlled administrative account or a dedicated signing workstation. Record the complete fingerprint, not a shortened key ID. The exact fingerprint is what belongs in the SignWith field, and it is the value you should retain in your operational records for later rotation or recovery.
Protect the secret key with a strong passphrase and restrictive filesystem permissions. Back it up separately from the VPS. A backup of the package pool without the signing-key recovery material will not let you continue publishing trusted metadata after a server loss.
Choose unattended signing carefully
Reprepro can request a passphrase with --ask-passphrase, but its manual warns that this is less secure than agent-based handling for unattended operation. For an automated build or upload process, use a controlled GnuPG agent arrangement rather than placing a passphrase in a script, environment variable, or web-server configuration. If signing is performed interactively, keep the key access limited to the administrative operator.
Export only the public key
Export the public part to a file that clients can download after you have configured HTTPS:
gpg --armor --export <fingerprint> > /srv/repo/repository-key.ascThe placeholder above must be replaced by the full fingerprint. This file contains no secret-key material, but it is still part of the trust-bootstrap process, so serve it only from the intended repository hostname over HTTPS.
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Define a distribution in conf/distributions
Write the distribution block
Create /srv/repo/conf/distributions with one block for each codename you support:
Codename: bookworm
Suite: stable
Architectures: amd64 arm64 source
Components: main
SignWith: <full-key-fingerprint>
Origin: Example Project
Label: Example Project
Description: Example Project Debian packagesReplace the fingerprint and descriptive fields with your project values. The codename in this file is the target name used by commands such as include and includedeb. A command targeting a codename that is not configured will fail rather than placing a package in an unknown distribution.
Add optional Contents indexes only when needed
APT clients that use apt-file can consume Contents indexes. Reprepro supports generating them through a Contents: setting, but Debian notes that Contents generation has a performance cost. Enable it only when the repository’s users need file-to-package searches; otherwise leave it out to reduce export work and repository metadata.
Export the initial metadata
After editing the configuration, run Reprepro from the repository base:
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reprepro createsymlinks
reprepro exportcreatesymlinks prepares the repository’s link structure, while export writes distribution metadata and signatures. Run both after configuration changes and inspect the resulting tree before opening the host to clients.
Add packages without bypassing Reprepro
Import a build described by a .changes file
When a build produces a Debian .changes file, include the build artifacts with:
reprepro -b /srv/repo include bookworm path/to/package_1.0-1_amd64.changesReprepro reads the files named by the changes file, places package data in the pool hierarchy, updates the distribution indexes, and signs the generated Release information. Use the configured codename exactly; in this example that is bookworm.
Import a standalone Debian package
For a single .deb without a changes file, use:
reprepro -b /srv/repo includedeb bookworm path/to/package_1.0-1_amd64.debThis is convenient for a manually produced package, but a repeatable build pipeline should normally retain its changes file and associated artifacts so the import describes the complete build.
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The pool is managed storage, not an upload drop-box. Copying a package into pool/ without importing it leaves the metadata unaware of that file, so clients will not receive it through APT. Route every package through include or includedeb, then verify the generated indexes.
Validate the repository before publication
Check the generated layout
Before configuring nginx, inspect the repository tree for all of the following:
- Package files under
pool/. - Distribution metadata below
dists/. - An
InReleasefile, or aReleasefile accompanied byRelease.gpg, for the published suite. - No secret key, private configuration, or database file in the public content you intend to serve.
The suite directory is derived from the configured suite label, so the example should produce metadata under dists/stable/. Keep the distinction clear: Reprepro commands use bookworm as the codename, while the exported directory and client source line use the suite or codename you have chosen to publish.
Test signature verification from a clean client
Do not rely only on a test performed from the VPS itself. On a clean Debian client, install the repository’s public key into a dedicated keyring, add the APT source entry, and run sudo apt update. A clean test catches an accidentally trusted local key, an incorrect URL, missing metadata, certificate problems, and permissions that the server’s own account would not reveal.
Publish only the public tree through HTTPS
Configure nginx to deny internal paths
Use /srv/repo as nginx’s document root, but explicitly deny the internal directories:
server {
listen 443 ssl;
server_name repo.example.com;
root /srv/repo;
location ^~ /conf/ { deny all; }
location ^~ /db/ { deny all; }
location / { try_files $uri =404; }
}Use the current TLS defaults and certificate automation for the Debian release and VPS provider you deploy. The exact certificate configuration changes over time, so keep it separate from the repository-specific rules above. Redirect HTTP to HTTPS and ensure the certificate covers the repository hostname used in every client source entry.
Verify denials from outside the server
From an external client, confirm that a normal package URL and the public key are reachable, while URLs such as https://repo.example.com/conf/distributions and https://repo.example.com/db/ are denied. A filesystem permission mistake can make a path appear protected locally while nginx still serves it, and a missing location rule can expose configuration through a directory alias.
Keep publication read-only
The nginx worker should only read the generated public tree. Package import, metadata export, and key management belong to the controlled administrative account. This separation limits the damage from a web-server compromise and prevents an HTTP request from becoming a repository write operation.
Bootstrap APT clients with a scoped trust anchor
Install the repository key in a dedicated keyring
Clients should receive the exported public key in a keyring under /usr/share/keyrings, rather than adding it to a globally trusted key store. The Debian setup pattern is to ship the key in an archive-keyring package and install an APT source-list file under /etc/apt/sources.list.d/. The package can be distributed through the repository after the initial trust bootstrap is established through a separately verified channel.
Add the APT source with signed-by
Once the keyring file exists at /usr/share/keyrings/example-project.pgp, add a source entry such as:
deb [signed-by=/usr/share/keyrings/example-project.pgp] https://repo.example.com/ bookworm mainThe codename and component must match the distribution you configured. The signed-by restriction tells APT to use this repository key for this source instead of treating the key as trusted for unrelated repositories.
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Refresh and install
After placing the source file and keyring, run:
sudo apt updateAPT should download the signed metadata and verify it against the scoped key. Only after a clean update should you install a package from the repository. If verification fails, stop and fix the key, URL, suite, certificate, or metadata rather than bypassing signature checks.
Rotate keys without breaking every client
Key rotation requires coordination between the repository and its clients. Publish the successor public key before changing the SignWith value. Update client keyring packages or configuration so clients possess the successor key, then change SignWith and export the next set of Release metadata. Remove the predecessor only after clients have had a defined migration window.
Keep a written record of the old and new full fingerprints, the date each became valid, and the recovery location of each secret key. A rotation plan should also define what happens if a key is suspected to be compromised: stop publishing with it, distribute a replacement trust anchor through a channel that does not depend on the compromised signature, and test apt update from a clean client.
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Back up and operate the repository safely
Back up all four recovery components
A usable recovery plan needs more than package files. Back up these components separately and protect the backups:
- The Reprepro database under
db/. - The package pool under
pool/. - The configuration under
conf/, includingdistributions. - Signing-key recovery material, stored separately from the public web tree.
Test that a backup can be restored to a controlled location and exported before you depend on it. Treat the signing key as the most sensitive item; anyone who can use it can produce metadata that clients will accept.
Use a controlled incoming path
Automated builders or uploaders should deposit artifacts into a controlled hand-off area. A privileged import step can validate and run Reprepro, while the uploader remains unable to edit dists/, pool/, conf/, or db/ directly. This also gives you a place to reject packages that target an unsupported codename or architecture before they reach the public tree.
Test after every structural change
Run a clean-client apt update after adding a distribution, changing a suite, rotating a key, altering nginx, or changing the certificate. Test both metadata retrieval and installation of a representative package. A repository can serve files successfully while still failing signature verification or advertising an incorrect component.
Troubleshoot by symptom
| Symptom | Likely cause | What to check |
|---|---|---|
| Reprepro rejects the target distribution | The command uses a codename absent from conf/distributions. |
Use the exact configured Codename, such as bookworm. |
| APT reports missing or unsigned Release metadata | Export was not run, the suite path is wrong, or the signature files are absent. | Run reprepro export; inspect dists/<suite>/InRelease or Release plus Release.gpg. |
| APT reports an unknown public key | The client keyring is missing, contains the wrong fingerprint, or is not referenced by signed-by. |
Compare the full fingerprint, verify the keyring path, and confirm the source entry. |
| APT cannot connect | Certificate, DNS, HTTP-to-HTTPS redirect, or nginx configuration problem. | Open the public key and a known package URL over HTTPS from outside the VPS. |
conf/ or db/ is visible online |
The server block lacks deny rules or an alternate location exposes the paths. | Request both paths externally, add explicit denials, and retest after nginx reload. |
| A package exists in storage but not in APT | It was copied into pool/ without a Reprepro import. |
Use include or includedeb, then export and inspect metadata. |
| Unattended publishing pauses for a passphrase | Interactive key protection is being used without an agent workflow. | Adopt controlled agent-based handling; do not put the passphrase in scripts. |
Reprepro’s command behavior and options can vary with the packaged version. The Debian bullseye manual is version-specific, so check the manual shipped by the Debian release running on your VPS before relying on an option in an unattended process.
Where Reprepro fits—and where it becomes difficult
Reprepro is a strong fit for a small or medium private archive when you want a filesystem-backed pool, multiple package versions, signed metadata, and a straightforward HTTPS publication layer without introducing a separate database service. It is also useful when the repository owner controls the build and import workflow.
The trade-off is operational complexity. Reprepro has many options and can be harder to learn than a minimal file-serving arrangement. As your archive grows, evaluate the following axes before changing tools or architecture:
- Repository scale: package count, metadata size, and export duration.
- Version retention: how many versions and distributions must coexist in the pool.
- Signing workflow: where the key lives, how agents operate, and how rotation reaches clients.
- Incoming automation: whether builds can produce validated changes files and use a controlled import step.
- Mirroring: whether you need to mirror another archive or serve multiple geographic locations.
- Database and operations: whether a filesystem-plus-Reprepro model remains easier to operate than a service with its own database and API.
For a single project repository on one VPS, keeping the design simple is usually safer than adding components you do not need. The security properties come from the boundaries—private signing and administrative data, signed metadata, HTTPS key delivery, scoped client trust, and repeatable clean-client tests—not from the VPS provider or web server alone.
Deployment checklist
- Install
reprepro,gnupg, and nginx from the Debian package manager. - Create a dedicated repository account and a private
conf/directory. - Keep
conf/,db/, and the secret OpenPGP key outside public access. - Record the signing key’s full fingerprint and use it in
SignWith. - Export only the public key as
repository-key.asc. - Define every supported codename, suite, architecture, and component in
conf/distributions. - Run
reprepro createsymlinksandreprepro exportafter configuration changes. - Import packages with
includeorincludedeb, never by copying directly intopool/. - Confirm signed metadata and package files exist before enabling clients.
- Serve the public tree only through HTTPS and deny
/conf/and/db/. - Install the public key in a dedicated client keyring and use APT’s
signed-by. - Back up the database, pool, configuration, and signing-key recovery material separately.
- Publish a successor key before changing
SignWith. - Run
sudo apt updateand an installation test from a clean client after every key, distribution, or web-server change.
With those controls in place, Reprepro provides a conventional Debian repository interface while keeping package metadata verifiable and the signing authority out of the public web surface.
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