For a new server, install Virtualmin with its LEMP bundle rather than installing Apache first: sudo sh virtualmin-install.sh --bundle LEMP. This selects Linux, Nginx, MariaDB and PHP as one supported deployment. Use PHP-FPM for each PHP website, prepare a fresh supported operating system, point DNS at the server, and size memory for the services you actually intend to run.
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If Virtualmin is already using Apache, switching to Nginx is a migration, not a single setting. Apache must be disabled, dependent Virtualmin features adjusted, Nginx modules installed, the system reconfigured, and Nginx features enabled globally and for each existing virtual server.
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Virtualmin’s automated installer is designed for a new, clean server. Start with a supported operating system that has current security updates and root or equivalent administrative access. Do not build a LEMP installation on top of an existing, heavily modified web stack unless you are prepared to resolve package and service conflicts manually.
- A fresh supported operating system: the installer configures the package manager and required dependencies. Existing web, mail or database packages can change the result of an automated installation.
- Enough memory: Virtualmin states that a basic installation needs at least 1 GiB of RAM. A full installation with mail, spam filtering and virus scanning needs about 4 GiB or more.
- DNS control: create records that point the domain and any required host name to the server before publishing websites. Incorrect DNS can make a correct Nginx configuration appear broken.
- Administrative access: you need to run the installer and control services such as Apache, Nginx and PHP-FPM.
- A deliberate LAMP/LEMP decision: Virtualmin’s current documentation says the bundle choice cannot be changed after installation without significant manual work.
| Deployment target | Memory guidance | Services included | Best fit |
|---|---|---|---|
| Basic installation | At least 1 GiB RAM, according to Virtualmin’s 2026 installation guidance | Core Virtualmin hosting stack | Small web server with modest service requirements |
| Full installation | About 4 GiB RAM or more, according to Virtualmin’s 2026 guidance | Web, mail, spam filtering and virus scanning, plus the broader hosting stack | A server intended to provide the complete hosting feature set |
| Mini installation | Virtualmin does not state a separate minimum in the cited guidance | Retains the web stack while skipping local mail handling, spam and virus filtering, local DNS, FTP and Jailkit | Low-memory, web-only VPS deployments |
Memory is not just an installation checkbox. Mail queues, spam scanning and virus scanning can consume substantially more memory than a web-only server, so choose the full profile only when those local services are required. If DNS, mail and FTP are supplied elsewhere, the mini profile avoids installing services you will not operate.
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Install a new LEMP server with the automated installer
1. Prepare the host name and DNS
Assign the server a stable host name and configure the DNS records for each domain to resolve to its public address. Allow time for records to propagate before testing websites. A domain that still points to an old address will reach the old server regardless of how carefully Nginx is configured.
2. Log in to the clean server
Use a root shell or an account with permission to run commands through sudo. Apply the operating system’s current security updates, then confirm that no existing Apache or other web service is expected to own ports 80 and 443. The automated installer needs to manage the package and service layout itself.
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sudo sh virtualmin-install.sh --bundle LEMPThe LEMP option tells Virtualmin to install the Linux, Nginx, MariaDB and PHP combination. Virtualmin’s download and installation documentation recommends the automated route because it configures package dependencies and reduces manual configuration errors.
4. Select the lighter profile when appropriate
For a web-only host, the installer supports a mini profile:
sudo sh virtualmin-install.sh --bundle LEMP --type miniThe mini type is intended to omit local mail delivery, spam and virus filtering, local DNS, FTP and Jailkit while keeping the web hosting components. Do not use it when the server is expected to provide those services locally.
5. Let the installer finish as one transaction
Do not interrupt package installation or start adding alternate web servers while the script is running. The installer configures dependencies and services together. When it completes, sign in to Virtualmin/Webmin, create a test virtual server and verify that its DNS name resolves to this host before troubleshooting application code.
Choose PHP-FPM for Nginx-hosted websites
PHP-FPM is the recommended PHP execution mode for Virtualmin. Instead of loading PHP into an Apache process, Nginx passes PHP requests to a FastCGI Process Manager pool. Virtualmin explains that separate pools for each website improve isolation, security, stability and resource management in shared hosting. The model also fits Nginx, which does not use Apache’s mod_php execution path.
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How the request path works
- A browser requests a URL from the domain.
- Nginx serves static files such as HTML, CSS, JavaScript and images directly.
- When the request targets a PHP script, Nginx forwards it to the PHP-FPM socket or endpoint assigned to that virtual server.
- The site’s PHP-FPM pool executes the script with that site’s permissions and returns the response to Nginx.
- Nginx sends the completed response to the browser.
Separate pools mean one site’s PHP workers can be limited or restarted without putting every site’s PHP execution in the same process group. They also make it easier to identify which virtual server is consuming CPU or memory.
Set the execution mode per virtual server
When creating a new virtual server, choose PHP-FPM in its PHP execution options rather than an Apache-specific mode. On an existing site, open that virtual server’s PHP configuration and select the PHP-FPM option provided by your Virtualmin version, then save and apply the change. Menu names can vary between Virtualmin releases, but the required result is the same: the site’s PHP requests must be sent to its FPM pool.
After changing the mode, test a real PHP page from the domain. A static page proves only that Nginx is listening; a PHP page proves that Nginx, the virtual-server mapping and PHP-FPM are connected. Remove diagnostic files after testing, especially any page that displays environment details.
Understand PHP configuration scope
PHP settings can exist at more than one level. Virtualmin specifically cautions that changing the system-wide /etc/php.ini does not automatically change every virtual server’s individual php.ini. A site can have its own limits and extensions even when the operating system has a different default.
- System configuration: affects the PHP installation where the setting is read, but is not a guarantee that every virtual server inherits the value.
- Per-version
.inifiles: Virtualmin notes that these can be used for settings intended to propagate across domains using that PHP version. - Per-site configuration: use the virtual server’s PHP options or its individual configuration when one domain needs a different memory limit, upload size or execution setting.
After changing a setting, test from the affected virtual server and confirm the effective value rather than assuming the edited file was loaded. Keep a record of which PHP version and configuration layer owns each important setting; this prevents a later package update or version change from appearing to “undo” a site-level change.
Full LEMP versus mini LEMP
The two profiles solve different hosting problems. Full installation is a broader, more convenient all-in-one host, but its mail, filtering and scanning services raise the memory requirement. Mini installation is narrower and better suited to a server whose only local responsibility is web hosting.
| Question | Full installation | Mini installation |
|---|---|---|
| Websites with Nginx and PHP-FPM | Included | Included |
| Local mail handling | Included | Skipped |
| Spam and virus filtering | Included | Skipped |
| Local DNS service | Included in the broader stack | Skipped |
| FTP and Jailkit | Included in the broader stack | Skipped |
| Memory guidance | About 4 GiB or more for the full feature set | No separate minimum stated by Virtualmin in the cited guidance |
Choose the profile based on service ownership, not on the number of domains alone. Ten small static sites may need fewer resources than one application with many PHP workers, while a mail-enabled server needs memory for filtering even if it hosts only one website.
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Do not treat an Apache-to-Nginx change as a toggle
Virtualmin’s documentation labels switching an existing Apache installation technically complex. The LAMP/LEMP choice is difficult to reverse because Apache-specific modules, virtual-server templates and dependent features may already be configured. Plan a maintenance window and take backups before changing a production host.
1. Disable Apache
Use the service name for the operating-system family:
# Debian derivatives
sudo systemctl disable --now apache2
# Enterprise Linux derivatives
sudo systemctl disable --now httpdStopping the service releases ports that Nginx must bind. Disabling it prevents Apache from returning after a reboot while the migration is in progress.
2. Disable Apache-dependent website and Virtualmin features
Existing virtual servers may have Apache website features enabled. Disable those features before enabling their Nginx equivalents. Virtualmin specifically calls out dependent functions such as status reporting, Awstats and htpasswd; review each site’s feature set rather than assuming that every Apache dependency has the same Nginx implementation.
3. Install Nginx and the Virtualmin Nginx modules
Virtualmin’s documented package examples differ by distribution:
| Operating-system family | Nginx and Virtualmin packages |
|---|---|
| Debian derivatives | nginx-full webmin-virtualmin-nginx webmin-virtualmin-nginx-ssl |
| Enterprise Linux derivatives | nginx webmin-virtualmin-nginx webmin-virtualmin-nginx-ssl |
Install the set that matches your distribution’s package manager and repository configuration. Do not mix package names between families merely because both systems are called “Linux.”
4. Rebuild the system configuration for Nginx
sudo virtualmin-config-system --include NginxThis tells Virtualmin to configure the Nginx integration rather than leaving the system with only manually installed packages.
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5. Enable Nginx features globally
Enable the global virtualmin-nginx and virtualmin-nginx-ssl features in Virtualmin. These provide the Nginx website and TLS integration that Apache-based templates previously supplied.
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6. Enable Nginx features for existing virtual servers
Global availability does not automatically convert every existing domain. Enable the Nginx website and Nginx SSL features for each virtual server that should be served by Nginx. Check each site’s document root, PHP-FPM selection, redirects and certificate settings before bringing it back into service.
7. Remove or quarantine obsolete Apache assumptions
Review rewrite rules, access-control files, authentication directives and monitoring integrations. A rule written for Apache may not be valid Nginx syntax, and a feature that depended on mod_status, Awstats integration or Apache password files may need a different configuration. Keep the old configuration backed up, but do not leave two services competing for the same ports.
Validate a new or migrated Nginx installation
Use a staged test sequence so that a failure identifies the layer that needs attention.
- Resolve DNS: query the domain from a network outside the server and confirm it returns the server’s current address.
- Check service ownership: confirm Apache is stopped on a migrated host and Nginx is the service listening for web traffic.
- Open a static file: verify that the expected virtual server and document root answer instead of a default Nginx page.
- Run a PHP request: load a small application page through the domain. A static success with a PHP failure points to the FPM mapping, socket, permissions or PHP configuration.
- Test HTTPS separately: confirm the SSL virtual-server feature and certificate serve the intended domain, not just the HTTP site.
- Test each existing domain: migrations can leave one virtual server on an old template even when another site works.
- Inspect logs and resource use: correlate Nginx errors, PHP-FPM errors and system memory rather than changing several settings at once.
Keep one simple test page and one representative application page available during the cutover. The first isolates the web server; the second exercises PHP-FPM, file permissions, database connectivity and application routing.
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Nginx will not start after migration
The usual first check is port ownership. Apache may still be running, or a second service may have claimed port 80 or 443. Stop and disable the conflicting service, then validate the Nginx configuration before starting it again. If the problem appeared after enabling a migrated virtual server, inspect that server’s generated configuration for an Apache-only directive or duplicate listener.
The domain shows the wrong site
Verify DNS first, then verify the domain is enabled as an Nginx virtual server and points to the intended document root. A stale DNS record, a default server block or an unchanged Apache template can all produce a valid response from the wrong site.
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Static files work but PHP returns an error or downloads as text
This indicates that Nginx is serving the site but is not handing PHP requests to the correct FPM pool. Confirm that PHP-FPM is selected for the virtual server, that the pool exists for the installed PHP version and that the Nginx integration was rebuilt with virtualmin-config-system --include Nginx. Check permissions on the socket and script path before changing application code.
Changing /etc/php.ini has no visible effect
Virtualmin warns that a system-wide file does not necessarily override each virtual server’s individual php.ini. Inspect the site’s effective configuration and place a shared setting in the appropriate per-version .ini file or set it at the virtual-server level, depending on the scope you need.
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PHP-FPM’s per-site pools provide the isolation needed to identify this condition. Review that site’s worker limits and application behavior, then reduce unnecessary concurrency or move to a host with more memory. Do not assume that adding more PHP workers improves performance when the server is already swapping.
Awstats, status or password protection stopped working
These are among the Apache-dependent features Virtualmin identifies as requiring attention during migration. Re-enable the supported Nginx equivalent where one exists, or redesign that function using an Nginx-compatible method. Treat each feature as a separate migration task instead of repeatedly restarting Nginx.
Resource and security practices for PHP-FPM
- Keep pools separated: retain one pool per website where Virtualmin provides that arrangement, especially on shared hosting.
- Use least privilege: ensure application files and the FPM process identity match the virtual server rather than running every site as a single administrator account.
- Patch the operating system and PHP packages: a supported OS and current security updates are prerequisites, not optional post-install work.
- Install only needed services: the mini profile is safer and easier to resource when local mail, DNS, FTP and filtering are intentionally provided elsewhere.
- Monitor before tuning: observe memory, CPU, FPM worker activity and Nginx errors before changing pool limits.
- Protect diagnostic output: remove PHP information pages and temporary migration files after validation.
- Back up before structural changes: keep copies of virtual-server data, databases, certificates and the previous Apache configuration before a migration.
When to install fresh instead of migrating
A fresh LEMP installation is normally the safer choice when the server is new, the current Apache host has few sites, or you can provision a replacement VPS and move domains one at a time. It preserves the clean assumptions of the automated installer and avoids converting every Apache-dependent feature.
Migration is justified when rebuilding the host is impractical and you have a tested backup, a maintenance window and a complete inventory of Apache-specific behavior. Count every virtual server, PHP version, SSL certificate, rewrite rule, scheduled task and dependent feature before starting. If you cannot reproduce a site’s behavior on a staging host, do not treat the production conversion as a routine package change.
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A practical decision checklist
- New server: use a fresh supported OS, confirm DNS, choose the LEMP bundle and run the automated installer.
- Web-only, low-memory server: consider
--type miniso mail, filtering, local DNS, FTP and Jailkit are not installed unnecessarily. - Full hosting server: budget about 4 GiB RAM or more for the documented full service set.
- PHP websites: select PHP-FPM, use separate pools and verify the effective per-site configuration.
- Existing Apache host: plan a staged migration; disable Apache and dependent features, install the correct Nginx modules, run the Virtualmin system configuration command, then enable Nginx features globally and per site.
- Configuration changes: do not assume
/etc/php.inicontrols every virtual server. - Future changes: record whether each setting belongs to the OS, a PHP version, a pool or an individual virtual server.
The reliable pattern is simple for a new deployment: select LEMP at installation time, run PHP through PHP-FPM, and size the server for the services it will actually host. An Apache-to-Nginx conversion can work, but it should be managed as a feature-by-feature migration with backups and validation, not as a one-click switch.
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