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What the finished VPS architecture looks like
A public request should not normally reach the application process directly. NGINX listens on the VPS’s web ports, terminates TLS, and forwards an approved request to a private application listener. For a typical HTTP application, the path is:
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- Internet: clients resolve a hostname to the VPS’s public IPv4 or IPv6 address.
- Firewall: only SSH and the web ports required by the design are admitted.
- NGINX: accepts HTTP and HTTPS, selects the correct server block, and proxies traffic.
- Application: listens on a private address such as
127.0.0.1:8000or on an internal Docker network. - Data services: a database, cache, and uploaded files remain private unless the application explicitly needs another exposure model.
This arrangement gives one place to manage certificates, redirects, request logs, and public routing while allowing the application runtime to change independently. It also prevents a forgotten development port from becoming a second public entry point.
Prepare the VPS before installing software
Record the server and application requirements
Choose a Linux distribution, CPU architecture, memory size, storage layout, and kernel support that match the application’s runtime, database, and native packages. Confirm whether the software supports the VPS architecture before you deploy. Record both public addresses shown by the provider:
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- the public IPv4 address, used for an A record;
- the public IPv6 address, if enabled, used for an AAAA record.
Write down the application’s listening port, required environment variables, persistent directories, database endpoint, background workers, and any WebSocket or long-running connection requirements. This inventory determines the NGINX proxy settings, firewall rules, volumes, and restart behavior.
Connect with a non-root administrative account
Use an account that can run approved commands with sudo, rather than operating the application as root. From your workstation, connect over SSH using the VPS address:
ssh [email protected]The address above is an example IPv4. Use your actual address or a DNS name that already resolves to the server. Before enabling any firewall, verify that this account can obtain a sudo shell and that your SSH key works in a second terminal.
Apply security updates first
Update the operating system before adding the application. The exact package command depends on the distribution; use its supported update mechanism, reboot when the kernel or critical libraries require it, then reconnect and confirm the machine is healthy. Do not copy a package command intended for another distribution. Also confirm the system clock is correct, because certificate validation and signed package metadata depend on accurate time.
Choose direct installation or Docker
Both deployment models are valid. The right choice depends on how much dependency isolation and image management your team can operate reliably.
| Decision area | Direct install with systemd | Docker with NGINX |
|---|---|---|
| Runtime layers | Fewer layers; the process runs against packages installed on the host. | An image packages the runtime and application dependencies separately from the host. |
| Reproducibility and rollback | Depends on disciplined package versions, deployment scripts, and configuration backups. | Image tags and immutable builds can make releases repeatable; rollback still requires retaining the previous image and compatible data migrations. |
| Dependency isolation | Lower isolation; unrelated applications can compete for host libraries and ports. | Clearer isolation, provided networks, volumes, secrets, and image sources are managed carefully. |
| Files and logs | Host paths are immediately available to the service and its administrator. | Persistent data must use deliberately designed volumes or bind mounts; container logs need a retention plan. |
| Startup supervision | systemd handles ordering, restart policy, environment files, and boot enablement. | Docker restart policies or a Compose-managed service handle container startup; host-level monitoring is still needed. |
| Operational learning curve | Best when the team already understands Linux services and host package management. | Best when the team already understands image builds, registries, networks, volumes, and container updates. |
Do not choose Docker merely to avoid learning systemd, or direct installation merely because it is familiar. Choose the model you can patch, inspect, back up, and roll back at 2 a.m. Keep the same external shape either way: NGINX is public, and the application port is private.
Install the application directly under systemd
Install the runtime and create an application account
Install the runtime version required by the application using the distribution’s packages or the runtime vendor’s documented repository. Pin or record the version so a later package update does not silently change application behavior. Create a dedicated unprivileged service account and a directory owned by that account, for example:
sudo useradd --system --home /srv/webapp --shell /usr/sbin/nologin webapp
sudo install -d -o webapp -g webapp /srv/webappPlace the release files in that directory, install dependencies in the method recommended by the runtime, and keep secrets outside the source tree. An environment file readable only by the service account is preferable to embedding credentials in a repository or command line.
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Bind the process to a private listener
Configure the application to listen on 127.0.0.1:8000 when NGINX runs on the same host. If the app is split into containers, bind it to the private container network instead. Do not bind an internal administration endpoint or database port to 0.0.0.0 unless public access is an intentional, separately protected requirement.
Before adding NGINX, test the process locally. A successful local response proves the runtime and application are working without involving DNS, certificates, or the firewall.
Create and test a systemd unit
Create a unit such as /etc/systemd/system/webapp.service. Adapt the executable, working directory, and environment file to the actual runtime:
[Unit]
Description=Web application
After=network-online.target
Wants=network-online.target
[Service]
User=webapp
Group=webapp
WorkingDirectory=/srv/webapp
EnvironmentFile=/etc/webapp/webapp.env
ExecStart=/srv/webapp/bin/start-webapp
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.targetReload unit files, start the service, inspect its status, and enable it only after a successful test:
sudo systemctl daemon-reload
sudo systemctl start webapp
sudo systemctl status webapp --no-pager
curl -I http://127.0.0.1:8000
sudo systemctl enable webappThe curl check should return the application’s expected HTTP status or headers. If it fails, inspect sudo journalctl -u webapp -e before involving NGINX.
Run the application with Docker
Install Docker Engine and define persistence
Install Docker Engine using the instructions for your Linux distribution and architecture. Keep the application image, configuration, and data responsibilities separate. A database or uploaded-media directory must be backed by a named volume or a deliberately chosen host path; container deletion must not delete required data.
Store secrets through the container orchestration method you have selected rather than baking them into an image. Record the image tag used for every production release. A mutable tag makes it difficult to identify what is running and to return to the previous build.
Use a private network and restart policy
Create an application network and publish no host port for the app when NGINX is on the host. NGINX can proxy to the container’s private address or to a host-side loopback binding. If a host mapping is needed for the proxy, bind it to loopback rather than all interfaces. Configure a restart policy appropriate for the service and verify that the container returns after a planned reboot.
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docker network create webnet
docker run -d
--name webapp
--network webnet
--restart unless-stopped
--env-file /etc/webapp/webapp.env
--volume webapp-data:/srv/webapp/data
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docker ps
docker inspect webapp
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Install NGINX as the public reverse proxy
Install and locate its files
Install NGINX from the distribution packages or the official NGINX repository. Its main configuration is under /etc/nginx/, and standard access and error logs are under /var/log/nginx/. NGINX is both an HTTP server and a reverse proxy; in this design it is the public edge while the application remains private.
Verify that the service is running locally before adding your domain:
sudo systemctl enable --now nginx
curl -I 127.0.0.1Create a server block
Create a site configuration for the hostname you will publish. The following example proxies to a directly installed service on loopback:
server {
listen 80;
listen [::]:80;
server_name app.example.com;
access_log /var/log/nginx/webapp.access.log;
error_log /var/log/nginx/webapp.error.log;
location / {
proxy_pass http://127.0.0.1:8000;
proxy_http_version 1.1;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
}Use the container’s private hostname and port instead of 127.0.0.1:8000 when NGINX itself runs inside the Docker network. Add WebSocket upgrade headers only if the application actually requires WebSockets. Keep a separate server block for each hostname and avoid a catch-all route that accidentally sends unknown domains to a sensitive application.
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Enable the site using the layout your distribution provides, then test the complete NGINX configuration:
sudo nginx -t
sudo systemctl reload nginx
sudo systemctl status nginx --no-pagerNever reload after editing a configuration that has not passed nginx -t. If the test fails, its line number usually identifies a missing semicolon, brace, include, or certificate path. If NGINX starts but returns a gateway error, inspect both the NGINX error log and the application log; a refused connection usually means the app is stopped, listening on another address, or using a different port.
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Set the firewall without locking yourself out
Firewall configuration is part of deployment, not a cosmetic hardening step. First allow SSH for your administration path. Then allow only the web ports your design uses, normally TCP 80 for HTTP validation and redirects and TCP 443 for HTTPS. Apply the rules using the firewall tool supported by your distribution.
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- HTTP (80): needed for ordinary HTTP traffic and common ACME HTTP validation.
- HTTPS (443): needed for encrypted public traffic.
- Application, database, and cache ports: keep closed to the Internet unless a documented architecture requires otherwise.
Open SSH before enabling or reloading the firewall, then test a new SSH session from another terminal. If you lose access, use the VPS provider’s out-of-band console rather than repeatedly changing rules blindly.
Point DNS at the VPS
Create an A record for the hostname pointing to the server’s public IPv4 address. If IPv6 is configured and NGINX listens on IPv6, create an AAAA record for the public IPv6 address. Ensure both addresses route to the same VPS and that the firewall permits the selected web ports on both stacks.
Wait until the hostname resolves correctly from the networks your users will use. Test both the name and the origin before requesting a certificate:
dig +short A app.example.com
dig +short AAAA app.example.com
curl -I http://app.example.comAn old DNS answer may persist during its record lifetime. Requesting a certificate before validation traffic reaches this VPS produces an avoidable failure.
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Use an ACME client such as the one provided for your distribution to request a certificate from Let’s Encrypt or another ACME-compatible authority. HTTP validation requires that the public hostname resolve to this VPS and that the validator can reach port 80. Keep NGINX serving the validation path while the certificate is issued.
After issuance, configure NGINX to listen on 443 with the certificate and private key paths supplied by the ACME client. Add an HTTP server block that redirects ordinary requests to the HTTPS URL, while preserving the validation workflow used by your client. Test the configuration with sudo nginx -t, reload NGINX, and verify from outside the VPS:
curl -I https://app.example.comAutomate certificate renewal through the ACME client’s scheduled timer or service, then perform a renewal dry run if the client supports one. A certificate that works today but cannot renew is an outage waiting for its validity period to end.
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Enable services and run the verification loop
After a deployment or configuration change, verify from the inside out. This order isolates faults quickly:
- Check the application process:
systemctl status webappfor a direct service, ordocker psanddocker logsfor a container. - Check the private listener:
curl -I http://127.0.0.1:8000, or the equivalent private container endpoint. - Check NGINX syntax:
sudo nginx -t. - Check NGINX status and recent logs:
sudo systemctl status nginx --no-pager, then inspect/var/log/nginx/. - Check DNS resolution for both A and AAAA records.
- Check the public HTTP and HTTPS URLs with
curl -Ifrom a separate network. - Reboot during a maintenance window and confirm the application, Docker containers if used, NGINX, and firewall rules return as expected.
Enable boot startup only after the service has passed local tests. For systemd, use systemctl enable; for containers, use a restart policy or your chosen Compose service manager. Record the expected status code, health endpoint, and startup order so another administrator can repeat the check.
Diagnose the common failure modes
| Symptom | Most useful first checks | Likely correction |
|---|---|---|
| SSH times out after firewall changes | Provider console, firewall rule list, SSH port, and source address. | Restore an SSH allow rule before changing web rules. |
| NGINX returns 502 or 504 | Application status, private curl request, NGINX error log, and configured proxy port. | Start the app, correct its bind address or port, or fix the container network name. |
| Domain does not reach the VPS | dig A/AAAA output, route, and firewall on both IP stacks. |
Correct DNS records or remove an AAAA record that points to an unusable IPv6 path. |
| Certificate validation fails | Public HTTP request, DNS resolution, port 80 rule, and ACME client output. | Make the hostname resolve to this VPS and keep the validation path reachable. |
| Application works locally but not publicly | NGINX syntax, server name, access/error logs, and HTTPS server block. | Correct the server block, proxy headers, certificate paths, or redirect logic. |
| Data disappears after a container update | Container mounts, volume list, and application data path. | Attach a persistent volume or host path and restore from a tested backup. |
| Changes vanish after reboot | Service enablement, Docker restart policy, environment-file permissions, and boot logs. | Enable the service, define restart behavior, and make dependencies available at boot. |
Read logs at the layer where the failure occurs instead of restarting everything. systemd’s journal explains process exits; Docker logs explain container startup; NGINX access logs show whether a request arrived; NGINX error logs show proxy and TLS failures; the application log explains a valid request that the app itself rejected.
Operate the VPS after the first release
Patch deliberately
Schedule operating-system, runtime, NGINX, Docker, and application updates. Read release notes for incompatible runtime or database changes, apply them in a maintenance window, and repeat the verification loop. Keep a record of the running image tag or package versions, systemd unit, NGINX configuration, environment-variable names, and firewall rules.
Back up data and configuration
Back up databases, uploaded files, environment configuration, TLS account data where appropriate, systemd units, and NGINX configuration. A backup is useful only if restoration has been tested on a separate instance. Keep application releases and the previous known-good image or package set long enough to support a rollback.
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Monitor at least the public HTTPS response, certificate renewal, disk usage, memory pressure, application process, NGINX process, and database availability. Alert on repeated restarts and log growth, not just total server downtime. A local health check can pass while DNS, the firewall, or TLS is broken, so include an external check of the real hostname.
Production checklist
- Distribution and architecture match the runtime and packages.
- Public IPv4 and IPv6 addresses are recorded and routed correctly.
- A non-root sudo account and working SSH key are tested.
- Security updates are applied before application installation.
- The application runs as a dedicated account or an appropriately restricted container.
- The application listens only on localhost or a private container network.
- Persistent data uses a documented volume or host path and is backed up.
- NGINX configuration passes
nginx -tbefore every reload. - Firewall rules allow SSH and only the required web ports.
- A and, when applicable, AAAA records resolve to the VPS.
- ACME validation succeeds and renewal is scheduled.
- HTTP redirects to HTTPS after certificate issuance.
- Services start at boot and survive a controlled reboot.
- Local curl checks, public HTTPS checks, service status, and logs all pass.
Choosing the safest default
For a single application maintained by a Linux-familiar team, a direct install supervised by systemd is often the smallest operational footprint. For a team that already builds and maintains images, Docker can provide cleaner dependency boundaries and repeatable releases. Neither choice removes the need for NGINX, least-privilege accounts, private application ports, firewall discipline, DNS correctness, certificate renewal, backups, and log-based verification. The dependable deployment is the one whose complete path—from public hostname to private process and back—can be explained, tested, and restored by someone other than its original author.
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