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Keep MongoDB off the public internet. Put the database on a private Docker network or private host address, run OpenVPN on a host that can route to it, allow TCP 27017 only from the VPN network, and still enforce MongoDB authentication, least-privilege authorization, and TLS. The VPN limits who can reach the service; MongoDB controls what an authenticated connection may do.
What the finished design looks like
The secure pattern has three separate boundaries:
- Internet edge: only the OpenVPN listener is reachable from the public internet.
- Private route: VPN clients receive an address from a dedicated VPN subnet and can route only to the private network that contains MongoDB.
- Database controls: MongoDB listens on a private interface, requires database credentials, applies roles, and uses TLS for client and internal traffic where applicable.
A typical flow is:
Authorized client
|
| OpenVPN TLS tunnel
v
OpenVPN host/container ---- private route ----> MongoDB host/container
| TCP 27017
Public interface: VPN port only No public 27017MongoDB’s hardening guidance says to ensure that only trusted hosts can access a deployment, use firewalls to limit incoming traffic, and use a VPN to create an encrypted, restricted trusted network. OpenVPN’s database pattern applies the same idea to MongoDB: remove the database port from the public internet and make it reachable through the VPN path only.
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A VPN authenticates a network connection; it does not prove that the person or application knows a valid MongoDB credential, nor does it limit database operations. If a VPN account is stolen, an exposed MongoDB listener without authentication becomes immediately useful to the attacker. Keep all three controls:
- Network restriction: host firewalls and security groups accept 27017 only from the VPN interface or VPN subnet.
- MongoDB authentication and authorization: access control is enabled, users are unique, and roles grant only the operations required by each application.
- Encryption: MongoDB TLS protects traffic inside the trusted network and across any segment that is not otherwise fully trusted.
MongoDB documents TLS as encryption for all MongoDB network traffic and supports strong ciphers with a minimum 128-bit key length. OpenVPN separately protects its control channel and key exchange with TLS. Treat those as different layers with different credentials and certificates.
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Prerequisites and an explicit threat model
Infrastructure you need
- A Linux host with Docker Engine for the VPN container and, optionally, MongoDB.
- A public IP address or DNS name for the OpenVPN endpoint.
- A private Docker network or private host interface on which MongoDB can listen.
- A VPN address range that does not overlap with client home, office, or cloud networks.
- Administrative access to host firewall or cloud security-group rules.
- Persistent storage for MongoDB data, VPN configuration, private keys, certificates, and logs.
OpenVPN in Docker needs the host’s /dev/net/tun device and network-administration capabilities. The container procedure for OpenVPN Access Server specifies NET_ADMIN, MKNOD, and the TUN device. These permissions are powerful: they let the container alter networking on the host, so the host and Docker daemon become part of the database security boundary.
Threats this design addresses
- Internet scanning and exploitation of a publicly reachable MongoDB port.
- Accidental exposure caused by a broad Docker port publication.
- Untrusted networks observing database traffic when TLS is absent.
- A compromised VPN account attempting unrestricted database access.
It does not make a compromised database host safe, and it does not replace patching, backups, secret management, endpoint security, or incident response.
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1. Place MongoDB on a private interface
Run MongoDB on an internal Docker network or a private host address. Do not publish 27017/tcp with a rule such as -p 27017:27017 on a host that has a public interface. If another application container needs MongoDB, attach both containers to the same internal network and refer to MongoDB through the Docker service name.
For a database on the host rather than in Docker, bind mongod to the host’s private address or loopback address needed by the application. Binding to all interfaces is not a substitute for a firewall and should not be used as the initial security measure.
2. Deploy OpenVPN on a routable host
The VPN host must have a public address for client connections and a route to the private network containing MongoDB. It can be the same physical host as MongoDB, but separate hosts reduce the impact of a compromise and make firewall boundaries easier to audit.
Persist the VPN configuration directory and certificate database on a protected volume. Losing that data can invalidate client profiles or prevent you from recovering the service after a container replacement.
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3. Grant the container only the required networking privileges
A Compose service or equivalent container definition should include the required capabilities and TUN mapping. The relevant settings are:
cap_add:
- NET_ADMIN
- MKNOD
devices:
- /dev/net/tun:/dev/net/tunUse the exact image documentation for the OpenVPN distribution you select. Do not add host devices, privileged mode, or a Docker-daemon socket mount merely to make a startup error disappear. A VPN container does not need access to /var/run/docker.sock; exposing that socket can give a process control over the Docker host.
4. Route only the database network
Advertise the specific private subnet that contains MongoDB, not the entire server network, unless users genuinely need broader access. The OpenVPN tutorial’s addresses and group names are documentation examples; replace them with non-overlapping ranges from your own network plan.
Create an explicit group, such as db-access, for users who need the database route. Users outside that group should receive no route to the MongoDB subnet. Keep administrative VPN access separate from application access.
5. Lock down the host firewall
Allow the VPN listener from the internet, management access from your administration network, and TCP 27017 only on the VPN interface or from the VPN client subnet. Deny other inbound paths. If MongoDB and OpenVPN share a host, write rules against the VPN interface and container network rather than allowing the entire public interface.
Cloud security groups, the host firewall, and Docker’s published-port rules must agree. A security-group rule that permits 27017 from 0.0.0.0/0 defeats the private design even if mongod is configured correctly.
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Configure MongoDB authentication and authorization
Enable access control before exposing the service
Enable MongoDB authorization in the configuration and restart the service during a planned maintenance window. On a new deployment, create the first administrative user through the localhost exception or another documented bootstrap method, then disable the exception according to your MongoDB version’s procedure.
Create separate users for applications, operators, monitoring, and backups. Give an application only the role and database it needs. A read-only reporting process should not use a user with write or cluster-administration privileges.
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db.createUser({
user: 'application-client',
pwd: passwordPrompt(),
roles: [ { role: 'readWrite', db: 'application_database' } ]
})The example illustrates the principle, not a universal role choice. Review built-in roles and create a custom role when the built-in permissions are broader than required. Never place a production password directly in a shell history, Compose file committed to source control, or public container environment.
Keep VPN and database identities separate
A VPN certificate or account should not be reused as a MongoDB username. Revoking a contractor’s VPN access should not require changing every application connection string, and rotating a database credential should not invalidate the person’s network identity. Maintain separate inventories and revocation procedures.
Add MongoDB TLS for defense in depth
When TLS is required
Use MongoDB TLS whenever traffic crosses a host boundary, a shared network, a cloud overlay, or any segment that is not fully controlled. The VPN encrypts its tunnel, but TLS still protects the database protocol from configuration mistakes, route leaks, and malicious or compromised hosts inside the VPN.
Plan certificate names around the hostname clients actually use. A client connecting to mongo.internal.example must be able to validate that name against the server certificate. Set certificate expiry reminders and test renewal before the current certificate expires.
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Using X.509 authentication
X.509 is a self-managed MongoDB authentication option in addition to SCRAM. It requires TLS, a common trusted certificate authority for client and server certificates, valid non-expired certificates, and correct serverAuth and clientAuth extended-key-usage settings. Certificate subject names must map to MongoDB users according to the rules for your MongoDB deployment.
If your team cannot operate a certificate authority, track trust chains, and rotate client certificates safely, use SCRAM with strong unique credentials while establishing a practical certificate-management process. Do not enable X.509 with a self-signed certificate copied indiscriminately to every client.
Choose an OpenVPN deployment model
| Decision area | Self-hosted OpenVPN container | Administration-focused OpenVPN distribution |
|---|---|---|
| User and group management | You configure users, profiles, and access policy through files or your own automation. | A web administration workflow can simplify user and group assignment, including a database-access group. |
| Certificate lifecycle | You own the certificate authority, renewal, revocation, and profile distribution process. | The distribution supplies management workflows, but you still own secure backups, expiry monitoring, and revocation decisions. |
| Private-subnet routing | You define routes, forwarding, and firewall rules directly. | The product documents VPN-only database access and can make route policy easier to operate. |
| Container requirements | Image-specific; TUN access and network capabilities are normally required. | The Docker procedure still requires Docker Engine, NET_ADMIN, MKNOD, and /dev/net/tun. |
| Logging | You assemble VPN, host, and authentication logs and decide retention. | Administrative views may help, but forward logs to your central system as well. |
| Patching responsibility | You patch the image, host, Docker Engine, and supporting components. | You still patch the host and container and must follow the distribution’s release guidance. |
| Cost and complexity | Lower licensing cost can mean more engineering and operational work. | Administrative features can reduce routine work but may introduce licensing or edition limits. |
Select based on who will operate identity, routing, certificates, and incident response. The secure result depends more on those controls than on the container label.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Store secrets and protect the Docker host
Use a secrets mechanism or files readable only by the service account for MongoDB passwords, VPN private keys, CA keys, and certificate chains. Restrict volume permissions and ensure backups are encrypted. Treat a VPN private key as an authentication credential: revoke and replace it if it is copied to an untrusted system.
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Patch the operating system, Docker Engine, OpenVPN image, and MongoDB image on a defined schedule. Pin image tags or digests so an unattended pull cannot silently introduce an untested major version, then update deliberately after checking compatibility and rollback procedures.
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Validate the design before production
Test from an authorized VPN client
- Connect with a client profile assigned to the database-access group.
- Confirm the client receives an address from the VPN range and a route only to the intended private subnet.
- Resolve the internal MongoDB hostname through the approved DNS path.
- Test TCP reachability to port 27017 from the VPN address.
- Connect with TLS enabled and a dedicated MongoDB user; verify that the user can perform only its assigned operations.
- Review VPN and MongoDB logs to confirm the expected source address, username, and authentication result.
Test from outside the VPN
- Use a network that is not connected to the VPN.
- Check that the public address has no reachable 27017 listener.
- Verify that an external client cannot complete a MongoDB connection, even if it knows the database hostname.
- Confirm that only the VPN listener and deliberately exposed administration services appear in the host’s external scan.
Repeat both tests after firewall, Docker Compose, routing, or cloud-security-group changes. A successful authorized test proves the intended path works; a failed external test proves the public exposure was removed.
Read the symptoms when something fails
| Symptom | Likely cause | Checks and correction |
|---|---|---|
| VPN client connects but 27017 times out | Missing route, forwarding rule, or firewall allowance. | Inspect the client route table, OpenVPN server routes, host firewall counters, and the MongoDB bind address. |
| MongoDB works on the host but not from the VPN | mongod is bound only to loopback or the wrong private address. |
Bind it to the required private interface, restart safely, and keep the firewall limited to the VPN source range. |
| Connection reaches MongoDB but authentication fails | Wrong database in the connection string, disabled user, incorrect role, or password rotation mismatch. | Check the user’s authentication database, account status, and MongoDB authentication logs without printing secrets. |
| TLS handshake fails | Expired certificate, untrusted CA, hostname mismatch, or incorrect extended-key usage. | Validate dates, trust chain, hostname, and serverAuth/clientAuth settings on both sides. |
| VPN container cannot start | TUN device absent or required capabilities omitted. | Confirm /dev/net/tun exists on the host and the container has NET_ADMIN and MKNOD as required by its documentation. |
| Unexpected public exposure appears | A Docker port publication, cloud rule, or host firewall rule permits 27017. | Remove the publication, restrict security groups, reload the firewall, and repeat the external test. |
Operate it as a security service
Logging and review
Collect VPN connection and certificate events, MongoDB authentication and authorization failures, firewall decisions, Docker events, and host login records in a central system. MongoDB’s security checklist recommends retaining logs for forensic analysis. Review successful logins as well as failures so an attacker using valid credentials is not invisible.
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Backups and recovery
Back up MongoDB data, VPN configuration, certificate-authority material, and firewall policy separately. Encrypt backups and test restoring both the database and the VPN identity system. Store an emergency administration procedure offline; a broken certificate chain or deleted VPN volume should not leave operators locked out.
Access reviews
Review membership in the VPN database-access group and MongoDB roles on a fixed schedule. Remove dormant profiles, rotate credentials after personnel or system changes, and revoke certificates immediately when a device is lost. Keep application accounts distinct so revoking one service does not interrupt unrelated workloads.
Final security checklist
- MongoDB is not published on a public interface and port 27017 is not allowed from the internet.
- The VPN endpoint is the only intentionally exposed database access path.
- The OpenVPN container has only the documented TUN device and network capabilities.
- VPN routes include only the private subnet that users need.
- Host firewalls and cloud security groups allow 27017 only from the VPN interface or subnet.
- MongoDB authorization is enabled, users are unique, and roles are least privilege.
- MongoDB TLS is enabled where traffic requires it, with valid trust chains and hostname checks.
- VPN certificates and MongoDB credentials are separate and stored as protected secrets.
- Docker’s daemon socket and host credentials are not exposed to untrusted containers or networks.
- Logs are centralized, patches are scheduled, backups are encrypted, and both authorized and external connection tests have passed.
The result is a layered design: OpenVPN decides which devices may enter the private network, firewall rules decide which paths are reachable, and MongoDB decides which authenticated identities may read or change data. Removing any one of those layers turns a contained database into a much easier target.
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