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To serve an app on your domain with Apache, point the domain’s DNS records to the server’s public IP, then create an Apache virtual host that answers for that hostname. A static site uses DocumentRoot; an app listening on a local port uses ProxyPass and ProxyPassReverse. Validate the configuration, reload Apache, test every hostname, and configure HTTPS in a separate port-443 virtual host.
DNS and Apache perform different jobs. DNS tells browsers which server to contact; Apache decides which content or backend should answer after the request reaches that server.
What you need before configuring Apache
Have these details ready before editing a virtual-host file:
- The exact domain name, such as
example.com, and any aliases, such aswww.example.com. - The server’s public IPv4 address for an
Arecord and, if you intentionally provide IPv6 service, its public IPv6 address for anAAAArecord. - Whether Apache will serve built files directly or forward requests to an application process running on a local port.
- The filesystem directory for a static site, or the backend bind address and port for a running app.
- Administrative access sufficient to create files, enable Apache modules or sites, validate configuration, reload the service, and inspect logs.
- Network rules that permit inbound TCP traffic on ports 80 and 443 when those ports are part of your deployment.
The examples below use example.com. Replace it with your real hostname, but keep the same relationship between DNS, the virtual host, and the application process.
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DNS must point to the server first
Creating an Apache virtual host does not create DNS records. Add or update the domain’s A and, where appropriate, AAAA records at your DNS provider so that example.com resolves to the server’s public address. If visitors should be able to use the www form, create a record for www.example.com as well, or use a DNS alias that ultimately resolves to the same server.
Wait for the records to become visible through the resolvers your visitors use. Test from outside the server’s network; checking only a local hosts-file entry can hide a public DNS mistake. Confirm that every name you plan to place in ServerName or ServerAlias resolves to the intended machine. An incorrect AAAA record is especially confusing when some clients prefer IPv6 and reach a different host while IPv4 clients reach the correct one.
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DNS answers the question “which IP address should receive this request?” Apache answers “which site should respond on that IP and port?” Both answers must be correct for the domain to work.
How Apache chooses a virtual host
Apache first narrows the candidates by destination IP address and port. For HTTP, it then compares the request’s Host header with each candidate’s ServerName and ServerAlias. For HTTPS, the TLS Server Name Indication (SNI) supplies the hostname during the TLS handshake, after which Apache selects the matching TLS virtual host.
If no hostname matches, Apache uses the first name-based virtual host defined for that address and port. That ordering explains many “wrong site” responses: the request reached Apache, but no ServerName or alias matched, so the default (first) vhost answered.
Run apachectl -S to see Apache’s parsed virtual-host map, including the address, port, ordering, and file that defines each vhost. On Windows installations, the equivalent command is commonly httpd.exe -S. This is the first diagnostic to use when Apache serves another site, reports an unexpected certificate, or appears to ignore a new configuration.
Serve a static site from Apache
A static deployment consists of files—HTML, CSS, JavaScript, images, and other assets—that Apache reads from a directory. Apache’s core HTTP service handles the request; no application proxy module is needed.
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1. Create the document root
Create a directory that will contain the built output. For example:
sudo mkdir -p /var/www/exampleCopy the finished site into that directory and ensure the Apache worker can traverse the directory and read the files. Use the ownership and permission model supplied by your operating system rather than making the entire tree writable by the web-server account.
2. Define the port-80 virtual host
Create a site configuration containing a ServerName, any aliases, a DocumentRoot, and a matching Directory policy:
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ServerName example.com
ServerAlias www.example.com
DocumentRoot /var/www/example
<Directory /var/www/example>
AllowOverride None
Require all granted
</Directory>
ErrorLog ${APACHE_LOG_DIR}/example-error.log
CustomLog ${APACHE_LOG_DIR}/example-access.log combined
</VirtualHost>ServerName is the canonical name for this vhost. Add every additional hostname that should serve the same files as a ServerAlias; an alias does not automatically cover unrelated names. AllowOverride None means Apache will not read per-directory .htaccess files for this directory. If your application requires overrides, change that policy deliberately and enable only the directives you need. Require all granted allows normal web requests to read the directory.
The log paths shown use the APACHE_LOG_DIR variable found in many packaged installations. If your distribution does not define that variable, use absolute paths in a directory that Apache can write to.
3. Enable the site using your package’s mechanism
Apache packages differ in how they discover configuration files. Some provide a separate “sites available/sites enabled” workflow; others load files from a single included directory. Place the vhost where your distribution expects it and use that distribution’s enable-site mechanism if one exists. Do not assume that copying a file into an arbitrary directory makes Apache read it.
On systems that provide helper commands, enabling a site may create a link into the active configuration directory. On other systems, you may need to add an Include entry or edit the package’s main configuration. Confirm the file appears in apachectl -S after enabling it.
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4. Check syntax and reload Apache
Validate the complete configuration before reloading:
sudo apachectl configtestProceed only when the result reports a successful syntax check. Reload Apache through your operating system’s service manager so existing connections can finish while the new configuration is read. The exact service command varies by operating system and package layout; use the command documented for your installation rather than treating one platform’s command as universal.
5. Test both names
Request the bare domain and every alias:
curl -I http://example.com
curl -I http://www.example.comCheck the returned status, headers, and content. A successful response from one name does not prove that the alias is configured: DNS or Apache may still route the other name elsewhere.
Reverse-proxy a running app through Apache
For Node, Python, or another server process, Apache can remain the public entry point while the app listens on a private address such as 127.0.0.1:3000. Apache receives the browser request, forwards it to the backend, and returns the backend response. The app process must already be running and listening on the address and port used in the vhost.
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Use the proxy directives together
A basic reverse-proxy vhost is:
<VirtualHost *:80>
ServerName example.com
ServerAlias www.example.com
ProxyPreserveHost On
ProxyPass / http://127.0.0.1:3000/
ProxyPassReverse / http://127.0.0.1:3000/
ErrorLog ${APACHE_LOG_DIR}/example-error.log
CustomLog ${APACHE_LOG_DIR}/example-access.log combined
</VirtualHost>ProxyPass maps requests arriving at Apache to the backend URL. ProxyPassReverse rewrites redirect-related response headers so that clients continue to use the public hostname rather than an internal backend address. ProxyPreserveHost On forwards the original host header, which many frameworks use for routing, URL generation, and allowed-host checks.
The trailing slashes in the example are intentional. Keep the path forms consistent when changing the mapping, and make sure the backend itself is prepared to serve requests at the path Apache forwards.
Enable the required proxy support
Enable the proxy modules required by your Apache package and deployment, then run the configuration test and reload. The module names and package commands vary by platform, so inspect the modules loaded by your installation rather than copying a distribution-specific command blindly. A missing proxy module usually appears as an “invalid command” error during apachectl configtest.
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Keep the backend private unless it is intentionally public
Binding the app to 127.0.0.1 keeps direct backend access on the server and makes Apache the controlled public boundary. If the app must be reachable from another machine, bind it to the required private interface and restrict that network path with firewall rules. Do not expose a development server simply because it is convenient for testing.
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Configure HTTPS with a separate TLS virtual host
HTTPS requires a vhost on port 443 with TLS enabled and a certificate and private key supplied by your chosen certificate workflow. Apache supports SSL/TLS encryption, URL rewriting, and reverse-proxy configurations, but certificate issuance, file locations, renewal, and key protection depend on your environment and certificate provider.
A TLS vhost follows the same static or proxy pattern as the port-80 vhost, with TLS directives added. A simplified shape is:
<VirtualHost *:443>
ServerName example.com
ServerAlias www.example.com
SSLEngine on
SSLCertificateFile /etc/ssl/example/fullchain.pem
SSLCertificateKeyFile /etc/ssl/example/privkey.pem
ProxyPreserveHost On
ProxyPass / http://127.0.0.1:3000/
ProxyPassReverse / http://127.0.0.1:3000/
ErrorLog ${APACHE_LOG_DIR}/example-ssl-error.log
CustomLog ${APACHE_LOG_DIR}/example-ssl-access.log combined
</VirtualHost>For a static site, replace the proxy directives with the same DocumentRoot and Directory block used by the HTTP vhost. The certificate must cover every hostname clients will use, including www.example.com if that alias remains active.
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First confirm that certificate issuance or installation succeeded, the key is readable by Apache, and the port-443 vhost answers the intended names. Test the HTTPS URLs directly. Only after HTTPS works should you change the port-80 vhost to redirect clients to HTTPS. Redirecting too early can turn a certificate or vhost error into a site-wide outage and can make renewal failures harder to diagnose.
When several HTTPS vhosts share an address, Apache uses the TLS SNI hostname to select the certificate and vhost. A missing alias or an unmatched SNI name can therefore produce another site’s certificate even when the HTTP configuration is correct.
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Static files versus a running application
The right Apache design depends on where content is generated and which process owns the request lifecycle.
| Concern | Static site | Running app behind Apache |
|---|---|---|
| Content source | Files under DocumentRoot |
Responses from a backend URL such as http://127.0.0.1:3000/ |
| Apache capability | Core HTTP service and directory authorization | Proxy modules plus the core HTTP service |
| Process and restart model | Deploy files; Apache serves them without an app process restart | Keep the backend process running and manage its restarts separately from Apache |
| Host and URL handling | Apache maps the request directly to a filesystem path | ProxyPreserveHost keeps the public host; ProxyPassReverse adjusts backend redirect headers |
| HTTPS termination | Apache can terminate TLS and serve files | Apache can terminate TLS and forward to an HTTP backend, provided the app handles trusted forwarded headers correctly |
Do not combine a DocumentRoot and a catch-all proxy mapping casually. Decide whether Apache owns the URL space or forwards it, then configure exceptions explicitly if a deployment genuinely needs both.
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One domain, aliases, and multiple domains
For one site with a second spelling, put the primary name in ServerName and the alternate spelling in ServerAlias. Both names still need DNS records that reach the server, and both names must be covered by the HTTPS certificate when TLS is enabled.
Separate domains that serve different applications should normally have separate virtual hosts. Give each vhost its own ServerName, aliases, document root or proxy target, and log files. Avoid relying on vhost order to separate sites: order determines the fallback response when a hostname is missing or mistyped.
| Deployment | DNS work | Apache naming | Ordering and TLS considerations |
|---|---|---|---|
| One domain, no alias | Point the single name to the server’s public IP | One ServerName |
Ensure the vhost is loaded on the intended port; certificate covers that name |
One domain plus www |
Point both names to the server, directly or through a DNS alias | Primary name in ServerName, alternate in ServerAlias |
Test both Host values and include both names in the certificate |
| Multiple independent domains | Point every domain and alias to the appropriate server | Use separate vhosts with distinct names and content targets | Check parsed order with apachectl -S; each TLS name must select the correct certificate |
Verify the complete request path
Verification should proceed from the outside in. Each check isolates a different layer:
- Use an external DNS resolver to confirm that the domain and aliases return the expected public IPv4 and, if used, IPv6 addresses.
- Confirm that firewall and cloud security-group rules allow the ports Apache is expected to accept: 80 for HTTP and 443 for HTTPS.
- Run
apachectl -Sand verify that the expected vhost, aliases, address, port, and configuration file are present. - Run
apachectl configtestand resolve every syntax or module error before reloading. - Request each HTTP hostname with
curl -I. An unexpected site usually indicates DNS, port selection, hostname coverage, or vhost ordering. - Request each HTTPS hostname separately and inspect the certificate and response. A correct HTTP result does not prove that SNI and the port-443 vhost are correct.
- For a proxied app, verify locally that the backend is listening on the configured address and port, then compare the backend’s behavior with Apache’s response.
- Read the vhost-specific access and error logs while making a request. The logs show whether Apache received the request and whether the failure occurred before or during proxying.
Troubleshoot the common failure modes
The domain shows no response or times out
- Check the public DNS answer, not just a local resolver cache.
- Confirm that the server is listening on the expected port and that host or cloud firewall rules allow it.
- Check both
AandAAAArecords. Remove or correct an IPv6 record that points clients to an unintended machine.
Apache serves the wrong site
- Run
apachectl -Sto see which vhost is first for the address and port. - Compare the requested hostname with the exact
ServerNameandServerAliasvalues. - Make sure the edited file is actually enabled and included in Apache’s active configuration.
- Check that DNS sends the request to the same server whose configuration you inspected.
HTTP works but HTTPS shows another certificate
- Verify that a port-443 vhost exists for the requested name and that SNI matching includes the alias.
- Check that the certificate covers the exact hostname, not merely a related name.
- Inspect
apachectl -Sfor competing TLS vhosts and their load order.
The proxy returns a gateway error
- Confirm that the backend process is running and listening on the exact address and port in
ProxyPass. - Check whether a local firewall, process policy, or bind address prevents Apache from reaching the backend.
- Read both Apache’s error log and the application log; the former identifies proxy-connection failures while the latter may explain an application-level rejection.
- Verify that required proxy modules are enabled and that
ProxyPassReverseand path slashes match the intended URL mapping.
The app redirects to an internal address or generates HTTP links
Keep ProxyPreserveHost On, configure the application’s trusted proxy or forwarded-header settings according to its framework, and ensure the app knows whether the original client connection was HTTPS. Apache can terminate TLS while forwarding plain HTTP locally, so the backend must receive trustworthy information about the public scheme.
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Run apachectl configtest before attempting another reload. Typical causes include a misspelled directive, a module that is not loaded, an invalid certificate path, or an unclosed XML-like Apache block. Fix the reported file and line first; do not hide the error by repeatedly restarting the service.
Maintain the deployment after it works
Keep separate access and error logs for each important vhost so that traffic and failures can be associated with the correct domain. Review log growth and retention using the facilities provided by your operating system. When deploying a new build, update the static files or restart the backend process as appropriate, then make a request through the public hostname rather than testing only the local process.
Document which DNS names belong to each vhost, which process owns each backend port, where certificates and keys are stored, and how the service is reloaded on your platform. Recheck certificate renewal before expiration and test both the bare domain and every alias after changes. If you add a domain later, update DNS, Apache naming, and certificate coverage as one change; leaving one layer out produces an apparently random failure.
Quick Recap
Configuration checklist
- DNS
A/AAAArecords resolve every public hostname to the intended server. - The vhost has the correct
ServerNameand every requiredServerAlias. - Static content has a readable
DocumentRoot, or the proxy target is running on the expected private address and port. - Required proxy and TLS modules are available for the directives used.
apachectl configtestsucceeds before every reload.apachectl -Sshows the intended vhosts and no accidental default is taking precedence.- Ports 80 and 443 are allowed by host and cloud firewalls where needed.
- HTTP and HTTPS requests succeed for the bare domain and each alias.
- The application trusts forwarded host and scheme headers only according to its documented security settings.
- Access and error logs are available for each vhost and are checked when behavior differs from expectations.
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