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Terraform is the infrastructure lifecycle tool in this design, not the Node.js process manager. Use provisioners only when startup data, an image, or configuration management cannot perform a narrowly defined post-apply task.
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A production-shaped single-VPS deployment has five layers:
- Terraform: declares the VPS, network dependencies, firewall policy, SSH key association, and address.
- cloud-init: runs on first boot, updates packages, installs Node.js/npm and NGINX, creates the deploy account, writes configuration, and enables services.
- systemd: runs the Node.js application as a dedicated user with restart and boot policies.
- NGINX: listens on the public web ports and forwards requests to the private Node.js listener.
- Verification and operations: health checks, logs, controlled updates, and a tested destroy path.
HashiCorp describes cloud-init as a standard configuration tool available on most Linux distributions and major cloud providers. The cloud-init project calls it the industry-standard, multi-distribution method for initializing cloud instances. It is therefore a better first-boot bridge than making Terraform open an SSH session to every new server.
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Decide the provider-specific pieces first
Terraform syntax for a VPS resource, firewall, SSH-key attachment, and public-address output differs by provider. Before writing the module, choose the exact provider, region, Linux distribution, and supported Node.js LTS line. Record those decisions in version control rather than relying on floating defaults.
Provider and region
Compare the regions where your users are located, IPv4 and IPv6 availability, included bandwidth and traffic limits, snapshots or backups, firewall controls, provider support, Terraform provider quality, and the complete monthly cost. These properties change by geography and over time, so obtain current values from the provider’s documentation before committing to a region.
Operating system and Node.js
Use a distribution with a supported security-update channel. Debian- or Ubuntu-family systems commonly use apt; Red Hat-family systems use different package commands and service conventions. Install a supported Node.js LTS release from the distribution or a trusted vendor repository, and pin the major line required by your application. The application’s engines field and lockfile should be the authority for the exact runtime.
Network policy
Allow SSH only from your administrative address range. Allow HTTP and HTTPS publicly if the application is public. Do not expose port 3000: NGINX should be the only public entry point, while Node.js binds to localhost. Apply the policy in the provider firewall or security-group resource, then verify it from an external network.
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Prepare a small Terraform project
Keep infrastructure and bootstrap files together, for example:
node-vps/
main.tf
variables.tf
outputs.tf
cloud-init.yaml
terraform.tfvarsInstall the Terraform CLI on your workstation, configure the selected provider and credentials using that provider’s documented method, and keep credentials out of source control. A typical workflow is:
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Use a protected remote backend for team work, enable state locking when the backend supports it, and restrict access to the state file. State can contain sensitive values even when your source code does not. Never place private SSH keys, application secrets, or long-lived provider tokens directly in Terraform files. Pass only the startup data and references that the provider requires, and use a secret-management mechanism appropriate to your provider for production secrets.
Attach cloud-init through startup data
Most VPS resources expose a field named user_data, custom_data, or an equivalent startup-data argument. Keep the YAML in a separate file and load it from Terraform:
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locals {
cloud_init = file("${path.module}/cloud-init.yaml")
}Set the selected VPS resource’s startup-data field to local.cloud_init. The resource block, image identifier, size, network arguments, and firewall syntax must come from your provider’s current Terraform documentation; do not copy a resource type from another provider. Export the provider’s assigned public IPv4 or hostname in outputs.tf so operators do not have to search the control panel after every apply.
Use cloud-init for first-boot configuration
The following Debian/Ubuntu-oriented example is intentionally self-contained. It creates a tiny Node.js HTTP service so the deployment can be tested without inventing a repository URL. Replace the sample files with your built application or image-baked release before production use. If your project includes a lockfile, the script uses npm ci --omit=dev; otherwise it falls back to the documented production install command.
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package_update: true
package_upgrade: true
packages:
- nodejs
- npm
- nginx
write_files:
- path: /opt/nodeapp/package.json
owner: root:root
permissions: '0644'
content: |
{"name":"nodeapp","private":true,"scripts":{"start":"node server.js"}}
- path: /opt/nodeapp/server.js
owner: root:root
permissions: '0644'
content: |
const http = require('http');
const port = Number(process.env.PORT || 3000);
http.createServer((req, res) => {
if (req.url === '/health') {
res.writeHead(200, {'Content-Type': 'application/json'});
return res.end(JSON.stringify({status: 'ok'}));
}
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Node.js app is runningn');
}).listen(port, '127.0.0.1');
- path: /etc/nodeapp/nodeapp.env
owner: root:root
permissions: '0640'
content: |
NODE_ENV=production
PORT=3000
- path: /etc/systemd/system/nodeapp.service
owner: root:root
permissions: '0644'
content: |
[Unit]
Description=Node.js application
After=network.target
[Service]
Type=simple
User=nodeapp
Group=nodeapp
WorkingDirectory=/opt/nodeapp
EnvironmentFile=/etc/nodeapp/nodeapp.env
ExecStart=/usr/bin/node /opt/nodeapp/server.js
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
- path: /etc/nginx/sites-available/nodeapp
owner: root:root
permissions: '0644'
content: |
server {
listen 80;
listen [::]:80;
server_name _;
location / {
proxy_pass http://127.0.0.1:3000;
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;
}
}
runcmd:
- [useradd, --system, --create-home, --home-dir, /home/nodeapp, --shell, /usr/sbin/nologin, nodeapp]
- [mkdir, -p, /etc/nodeapp, /opt/nodeapp]
- [chown, -R, nodeapp:nodeapp, /opt/nodeapp]
- [bash, -c, 'if [ -f /opt/nodeapp/package-lock.json ]; then npm ci --omit=dev --prefix /opt/nodeapp; else npm install --omit=dev --prefix /opt/nodeapp; fi']
- [ln, -sfn, /etc/nginx/sites-available/nodeapp, /etc/nginx/sites-enabled/nodeapp]
- [rm, -f, /etc/nginx/sites-enabled/default]
- [systemctl, daemon-reload]
- [systemctl, enable, --now, nodeapp.service]
- [nginx, -t]
- [systemctl, enable, --now, nginx]For a real release, deliver the application files before the npm command runs. Common approaches are baking the release into a machine image, having cloud-init unpack an artifact supplied through a provider-supported mechanism, or using a separate configuration-management/deployment system. Do not put a private repository token in the YAML or Terraform state. If your distribution installs Node.js somewhere other than /usr/bin/node, update ExecStart to the actual path.
Why the unit file matters
WorkingDirectory makes relative paths deterministic. EnvironmentFile keeps runtime settings outside the unit definition and allows a permissions-restricted file. User=nodeapp prevents the application from running as root. Restart=on-failure handles crashes without hiding a clean administrative stop, and WantedBy=multi-user.target makes the service start during normal boot.
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Why NGINX stays in front
Node.js remains bound to localhost, so the firewall never needs to expose port 3000. NGINX owns the public listener and forwards the original host, client address, and protocol headers. TLS termination, certificate automation, request limits, and static-file rules can be added at NGINX without changing the application listener.
Apply and wait for first boot
Run the formatting, validation, and plan checks before applying. After terraform apply reports the address, do not assume the application is immediately ready. cloud-init starts after the VM is provisioned and may need several minutes before SSH and the service are available.
- Connect with the intended non-root administrative user:
ssh user@PUBLIC_IP. The exact username comes from the selected image and your SSH-key configuration. - Wait for initialization with
sudo cloud-init status --wait. On distributions without that command, use the distribution’s equivalent status mechanism. - Confirm the runtime:
node --versionandnpm --version. - Check the service:
systemctl is-enabled --quiet nodeapp.serviceandsystemctl is-active --quiet nodeapp.service. - Test locally on the VPS:
curl -fsS http://127.0.0.1:3000/health. - Validate NGINX with
sudo nginx -t, then test externally withcurl -i http://PUBLIC_IP/healthor your DNS name.
Use journalctl -u nodeapp.service for application logs and the NGINX error log for proxy failures. Keep the Node.js port private while allowing only the required public ports through the provider firewall.
Keep Node.js running after SSH disconnects
Do not start production Node.js with node server.js in an interactive SSH shell. That process is tied to the session and has no boot, restart, or log policy. The systemd unit is independent of your terminal: once enabled, it starts at boot; once active, it survives your SSH disconnect; and when the process exits unsuccessfully, systemd retries it after the configured delay.
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Use sudo systemctl restart nodeapp.service for a controlled restart, sudo systemctl stop nodeapp.service for maintenance, and sudo systemctl status nodeapp.service for a concise diagnostic view. A clean stop should remain stopped; repeated crash loops should be investigated rather than masked with an aggressive restart policy.
Cloud-init, images, configuration management, and provisioners
Choose the mechanism that matches the lifecycle you need:
| Method | Repeatability | Network reachability | Drift and rollback | Debugging profile |
|---|---|---|---|---|
| cloud-init startup data | Runs consistently on first boot from the declared VM definition | Does not require Terraform to reach the guest after creation | Good for immutable replacement; changes normally require a new instance or an explicit in-guest update | Inspect cloud-init status and logs on the VM |
| Machine image | Fast and highly repeatable when the image pipeline is controlled | Guest access is unnecessary during boot | Rollback is selecting a previous image version | Debug the image build as well as first-boot configuration |
| Configuration management | Designed for recurring convergence and larger fleets | Usually needs an agent, control channel, or reachable management endpoint | Handles drift better than one-time bootstrap when applied regularly | Centralized tooling can improve diagnostics but adds another system |
| Terraform provisioner | Less predictable because scripts run outside Terraform’s resource model | Usually requires direct SSH or another connection from the workstation or runner | Replacement, retries, and partial failure behavior need explicit design | Failures commonly fail terraform apply; inspect both Terraform output and guest logs |
HashiCorp recommends provider-native startup data, cloud-init, images, or configuration management before provisioners. Its guidance emphasizes that Terraform is designed primarily for immutable infrastructure and that purpose-built tools are preferable for provisioning software.
When a provisioner is justified
Terraform provides local-exec, remote-exec, and file provisioners. Use one only for a narrowly bounded post-apply action that the provider, image, cloud-init, or configuration-management tool cannot perform. Remote execution needs a connection block, commonly SSH; scripts run in declaration order, and a failed provisioner normally fails the apply.
- Make the script idempotent: a second run should converge rather than duplicate users, files, or services.
- Use a dedicated or ephemeral deployment key and restrict its source addresses and permissions.
- Document what happens when the VPS is replaced, when the runner cannot reach SSH, and when a retry follows a partial run.
- Keep secrets out of command-line arguments and Terraform state.
Updates, replacement, and rollback
For an immutable workflow, build a new image or startup-data version, create a replacement VPS, verify its health endpoint and public proxy, then switch the address or DNS according to your provider’s capabilities. This gives a clean rollback: return traffic to the previous healthy instance while investigating the new one.
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For an in-place update, upload the new release to a versioned directory, install production dependencies, adjust the systemd working path or symlink, run the health check locally, and restart the unit. Keep the previous release until the new one passes verification. Terraform should continue to own infrastructure changes; do not edit firewall rules or the public address manually and expect Terraform state to understand the drift.
Security and operations checklist
- Use a non-root deploy or service user and disable unnecessary interactive access for that account.
- Expose SSH only to an administrative range; expose HTTP/HTTPS publicly only when required.
- Keep Node.js on localhost and let NGINX handle public traffic.
- Apply security updates during image building or first boot, then define how ongoing patching will occur.
- Protect remote Terraform state and review every planned change.
- Keep environment files readable only by root and the service account; use an external secret store for high-value credentials.
- Retain application and NGINX logs long enough to investigate crashes and failed deployments.
- Test restoration from snapshots or backups rather than assuming they work.
Troubleshooting common failures
| Symptom | Checks | Likely correction |
|---|---|---|
| SSH times out immediately after apply | Confirm the public address, provider firewall, image username, and cloud-init completion | Wait for first boot, allow SSH from your administrative range, and use the image’s documented user |
| cloud-init reports failure | Run cloud-init status --long and inspect its logs |
Fix YAML indentation, package names, or command ordering; recreate the VPS when a clean first boot is required |
| systemd is inactive | Run systemctl status nodeapp.service and journalctl -u nodeapp.service |
Check ExecStart, the Node.js path, file ownership, environment variables, and the application’s start command |
| Local health check works but public HTTP fails | Run nginx -t, inspect the NGINX error log, and verify ports 80/443 in the provider firewall |
Correct the server block, enable the site, or open only the required public ports |
npm ci fails |
Check whether a lockfile exists and whether its package-manager version matches the project | Commit the correct lockfile or use the project’s documented production installation command |
| Service works until reboot | Check systemctl is-enabled nodeapp.service and NGINX |
Enable both units and confirm the unit has an [Install] target |
Destroy disposable environments deliberately
For a test VPS, run terraform destroy after collecting the logs or snapshot you need. HashiCorp’s tutorial demonstrates destroying a test instance to avoid ongoing charges. In a production workspace, protect the state and require review before destroy; verify that backups, DNS, and replacement capacity are handled before approving it.
Quick Recap
Final deployment sequence
- Select and pin the provider, region, Linux image, and Node.js LTS line.
- Declare the VPS, SSH association, firewall, and address in Terraform.
- Pass cloud-init through the provider’s startup-data field.
- Install the app as a non-root user, run its production dependency install, and register systemd.
- Proxy NGINX to
127.0.0.1:3000; never expose the Node.js port publicly. - Apply, wait for cloud-init, verify systemd, test the health endpoint externally, and inspect logs.
- Use immutable replacement or a documented in-place release process for updates, and reserve provisioners for exceptional cases.
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