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Run one PHP-FPM service for each PHP version, give every service its own pool and Unix socket (or TCP port), then route each Apache virtual host to the endpoint it needs. Apache makes the per-site decision; PHP-FPM only executes the FastCGI request it receives.
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This arrangement lets one Apache instance serve, for example, one application on PHP 8.2 and another on PHP 8.3 without changing the system-wide command-line PHP version. The exact package names and supported branches depend on your operating-system release, so treat version numbers below as examples and verify that your distribution supplies them.
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What the architecture looks like
There are three separate pieces:
- Apache HTTP Server accepts the browser request, selects a virtual host, and forwards PHP requests.
- One PHP-FPM service per PHP version runs the corresponding PHP binaries and loads that version’s
php.iniand extensions. - A distinct FastCGI endpoint per service identifies where Apache should send the request. The endpoint is normally a Unix-domain socket under
/run/php, but it can be a localhost TCP port.
PHP-FPM is a process manager and FastCGI backend. It does not know which Apache virtual host, alias, or document root originated a request. Apache must therefore provide the script path and select the correct endpoint inside each site’s <VirtualHost> block.
For instance, example-a.test can send index.php to /run/php/php8.2-fpm.sock, while example-b.test sends its scripts to /run/php/php8.3-fpm.sock. Both sites remain on the same Apache process and listen address.
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Plan versions, pools, and endpoints before installing
Choose versions that your operating system actually packages
PHP branches and package names change between Ubuntu, Debian, and their releases. The practical tutorials commonly used for this pattern target Ubuntu 20.04 and Debian 10, but those releases do not define what a newer operating system provides. Check your distribution’s package index and security-support policy first. Do not assume that an unmaintained branch is available, patched, or suitable for a public site.
Keep the version in every service, socket, pool filename, and monitoring rule. A naming scheme such as php8.2-fpm, php8.3-fpm, /run/php/php8.2-fpm.sock, and /run/php/php8.3-fpm.sock makes accidental cross-routing easier to spot.
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Decide whether each version needs one pool or several
A separate service is the boundary that selects the PHP version. Within that service you may use one shared pool or multiple pools. Use separate pools when applications need different Unix users, filesystem permissions, environment settings, or worker limits. A pool can run under a site-specific user and group, while the socket is owned by that account and Apache’s runtime group.
Multiple pools increase the number of processes and settings you must monitor. Start with one pool per version unless you need a stronger per-site security boundary, then split pools deliberately.
Unix socket or TCP listener?
| Choice | How Apache addresses it | Best fit | Operational requirements |
|---|---|---|---|
| Unix-domain socket | proxy:unix:/run/php/phpX.Y-fpm.sock|fcgi://localhost/ |
Services on the same host | Socket path must exist after startup; Apache must have permission to connect. |
| TCP listener | A local address such as 127.0.0.1:90XY in a FastCGI proxy rule |
Containers, network namespaces, or an intentional service boundary | The port must be unique, reachable, and protected from unintended remote access. |
Unix sockets avoid a network listener and are the natural same-host default. TCP is useful when the FPM service is isolated from Apache, but keep it bound locally unless remote FastCGI is an explicit design. In either case, verify reachability as the Apache service user, not only as root.
Install and start each PHP-FPM service
Install the PHP runtime and matching FPM package for every branch you intend to serve. On Debian-family systems, package names often follow the pattern shown below; the exact names and available versions vary by release.
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sudo apt install php8.2-fpm php8.2-cli php8.2-common
sudo apt install php8.3-fpm php8.3-cli php8.3-commonInstall the extensions required by each application for that version as well. An extension enabled for PHP 8.2 is not automatically enabled for PHP 8.3: each FPM service reads its own configuration tree.
Start and enable the services independently:
sudo systemctl enable --now php8.2-fpm
sudo systemctl enable --now php8.3-fpm
sudo systemctl status php8.2-fpm
sudo systemctl status php8.3-fpmUse the service names supplied by your distribution if they differ. A successful systemctl result only proves that the manager started; it does not prove that the intended pool is listening on the intended endpoint.
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Give every pool a unique listener
Open the pool configuration for each service. Distribution layouts differ, but a pool commonly contains a listen directive. Set one unique socket or port per version:
listen = /run/php/php8.2-fpm.socklisten = /run/php/php8.3-fpm.sockIf you use TCP instead, assign different local ports, such as 127.0.0.1:9082 and 127.0.0.1:9083. Never point two versions at the same socket or port; the second service will fail to bind or Apache will reach whichever process won the race.
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After changing a pool, restart only the affected service and check its logs:
sudo systemctl restart php8.2-fpm
sudo systemctl restart php8.3-fpm
sudo ss -lx | grep /run/php
sudo ss -ltnp | grep 908The socket listing should show the versioned paths, or the TCP listing should show the expected local ports. If a socket is missing, inspect the service status and FPM error log before changing Apache.
Set socket ownership and pool limits
Apache needs permission to open a Unix socket. Pool configuration normally exposes directives for socket owner, group, and mode. Set them so the Apache runtime user (or its group) can connect, while unrelated users cannot submit FastCGI requests. Confirm the actual runtime user for your distribution instead of assuming it is named www-data.
Pool capacity also belongs here. FPM’s prefork workers process one connection at a time. Set pm.max_children, spare-worker settings, and request limits for the application’s memory and traffic profile, then revisit them after observing logs and resource use. A larger number is not automatically faster: every active child consumes memory.
Enable Apache’s FastCGI proxy modules
Apache needs the proxy core, the FastCGI adapter, and the environment support used by common PHP-FPM configurations. On Debian-family systems, the usual module command is:
sudo a2enmod proxy proxy_fcgi setenvif
sudo apachectl configtestOther distributions enable modules through package configuration or load files directly. Confirm that mod_proxy_fcgi is loaded before troubleshooting a handler. The Apache integration point is mod_proxy_fcgi; loading a different PHP module globally is not a substitute for per-site FPM routing.
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Remove or neutralize a global PHP handler
A distribution-wide FPM configuration or an old mod_php rule can capture requests before your virtual-host rule does. Search the enabled Apache configuration for global SetHandler, ProxyPassMatch, or PHP module directives. Disable the rule that forces every site to one backend, then keep the deliberate handler inside each site’s virtual host.
Do not leave a second PHP handler active “just in case.” Two competing handlers make the effective route dependent on configuration order and can produce a site that appears to ignore its own block.
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Unix-socket configuration with SetHandler
Place the handler in the virtual host that owns the application. The following example sends one site’s PHP files to PHP 8.2:
<VirtualHost *:80>
ServerName example-a.test
DocumentRoot /var/www/example-a/public
<Directory /var/www/example-a/public>
Require all granted
DirectoryIndex index.php index.html
</Directory>
<FilesMatch ".php$">
SetHandler "proxy:unix:/run/php/php8.2-fpm.sock|fcgi://localhost/"
</FilesMatch>
ErrorLog ${APACHE_LOG_DIR}/example-a-error.log
CustomLog ${APACHE_LOG_DIR}/example-a-access.log combined
</VirtualHost>A second virtual host can select PHP 8.3 simply by changing the endpoint:
<VirtualHost *:80>
ServerName example-b.test
DocumentRoot /var/www/example-b/public
<Directory /var/www/example-b/public>
Require all granted
DirectoryIndex index.php index.html
</Directory>
<FilesMatch ".php$">
SetHandler "proxy:unix:/run/php/php8.3-fpm.sock|fcgi://localhost/"
</FilesMatch>
ErrorLog ${APACHE_LOG_DIR}/example-b-error.log
CustomLog ${APACHE_LOG_DIR}/example-b-access.log combined
</VirtualHost>The fcgi://localhost/ suffix is part of Apache’s Unix-socket proxy syntax. The socket path before the pipe selects the FPM service; the FastCGI URI supplies the backend context.
Using ProxyPassMatch instead
Apache also supports a regular-expression proxy rule. A Unix-socket form is:
ProxyPassMatch "^/(.*.php(/.*)?)$" "unix:/run/php/php8.2-fpm.sock|fcgi://localhost/var/www/example-a/public/$1"Use the exact path semantics documented for your Apache version and configuration layout. The rule must produce the correct script filename, including the virtual host’s document root. If the path is wrong, FPM may report a missing script or Apache may expose the PHP source instead of executing it. Do not combine a broad ProxyPassMatch with a conflicting SetHandler unless you have a specific reason and have tested the resulting precedence.
TCP example
For a pool listening on a local TCP port, the handler can target that port instead of a socket:
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<FilesMatch ".php$">
SetHandler "proxy:fcgi://127.0.0.1:9082"
</FilesMatch>Use the matching port for the selected version in each virtual host. Keep the listener on loopback unless a remote FastCGI connection is intentionally secured and monitored.
Enable the sites, reload Apache, and verify the result
- Create one site configuration per application and place the correct handler inside each
<VirtualHost>. - Enable the site using your distribution’s normal mechanism, such as
a2ensite example-a.confanda2ensite example-b.confon Debian-family systems. - Run a syntax check before touching the running server:
sudo apachectl configtest. Continue only when it reports a successful result. - Reload Apache so existing connections are handled gracefully:
sudo systemctl reload apache2. Use the service name supplied by your distribution. - Temporarily create a diagnostic endpoint in each document root. A minimal file can contain
<?php phpinfo();. Restrict access to your administrator’s address or a private test hostname. - Request each hostname and inspect the page’s PHP version, “Server API” value, loaded configuration file, and extensions. The expected SAPI is FPM/FastCGI, and the version must match the socket named in that virtual host.
- Delete the diagnostic file immediately after verification. A public
phpinfo()page reveals paths, modules, and environment details useful to attackers.
Test with the real hostname, not only an IP address. Apache chooses a virtual host from the request’s host header, so an IP-only request can land on a default site and falsely suggest that routing is broken. A command-line check can make the host selection explicit:
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curl -H 'Host: example-b.test' http://127.0.0.1/version.phpUse a deliberately small version endpoint rather than exposing a full diagnostic page in routine monitoring.
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A global handler overrides the virtual host
If every site reports the same version, inspect enabled Apache files for a global FPM include, SetHandler, or legacy PHP module. Remove the all-sites rule and leave the version-specific mapping in each virtual host. Also check that the request is reaching the intended virtual host name rather than the default host.
The socket name is not the service you think it is
Package upgrades can change default pool filenames or recreate a socket after a service restart. Compare the literal path in Apache with the active listen directive and the socket shown by ss. A path that looks versioned is not proof of the binary version behind it; verify the FPM service and diagnostic endpoint together.
Apache cannot access the socket
A 503 response, “connection refused,” or a permission error usually means the service is stopped, the socket path is wrong, or its owner and mode exclude Apache. Check the FPM unit status, then inspect Apache’s error log and the FPM log at the same timestamp. Correct ownership or group membership rather than making the socket world-writable.
The script is downloaded or the path is wrong
If PHP source downloads, Apache is serving the file as static content and the FastCGI handler is not active for that request. Confirm that mod_proxy_fcgi is loaded and that the FilesMatch pattern matches the requested filename. If FPM says the script does not exist, inspect the document-root path supplied by the handler or ProxyPassMatch. Apache’s FastCGI path and SCRIPT_FILENAME behavior must identify the file on disk, including applications installed in subdirectories or using front controllers.
The version is correct but an extension is missing
Each FPM version has its own extension set and configuration files. Install the required extension for the FPM branch that serves the site, restart that branch, and check the diagnostic output again. Installing an extension only for the command-line PHP binary does not guarantee that FPM loads it.
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Size Apache and FPM together
Apache’s connection behavior can expose a capacity problem that is not visible on a quiet server. With a threaded Apache MPM and connection reuse, proxy connection pools can grow toward the number of Apache workers. PHP-FPM uses a prefork model in which each worker handles one connection at a time. If all FPM workers are occupied by persistent idle connections, new requests can wait and eventually time out.
Treat Apache worker limits, proxy connection reuse, and FPM worker counts as one capacity plan:
- Estimate concurrent PHP work and the memory available to each version.
- Set
pm.max_childrenso a busy pool cannot exhaust system memory. - Check Apache’s worker and connection limits so it cannot create a backlog far larger than FPM can process.
- Observe Apache and FPM error logs under representative load, looking for connection timeouts, “server reached” messages, and exhausted child pools.
- Give high-traffic versions their own pool limits instead of allowing one application to consume every child of a shared pool.
Persistent proxy connections are not automatically harmful, but they must be included in the worker calculation. A configuration that works with one PHP version can fail after adding a second if total Apache workers and all FPM pools compete for the same memory and CPU.
Security and isolation decisions
Different PHP versions are not, by themselves, a security boundary between applications. Use separate pools and Unix users when one site must not read another site’s files. Set each site’s document-root ownership, pool user, socket group, and writable directories deliberately. Avoid granting a pool access to the entire server simply to make a permission error disappear.
For TCP, bind listeners to loopback or the private interface required by the deployment, restrict access with the host firewall where appropriate, and do not expose an unauthenticated FastCGI port to the public internet. For Unix sockets, protect the containing directory and socket mode.
Keep the PHP branches and their extensions patched according to the operating system’s security process. A site pinned to an older branch for compatibility should be treated as a migration project, not as a reason to disable updates for every other site.
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Update one branch without changing another
Package updates, pool restarts, and extension changes are per service. Restarting php8.2-fpm should not be necessary merely because an unrelated site uses PHP 8.3, although a shared host reboot affects all services. Record which virtual hosts depend on each branch before scheduling maintenance.
Monitor the endpoint, not only the web page
Check that every expected FPM service is enabled, running, and listening. A web check can pass through a fallback virtual host while the intended socket is down. Monitor service status, socket existence, Apache error rates, FPM child utilization, and request latency per site.
Document the mapping
Keep a short inventory containing each hostname, document root, PHP version, pool name, socket or port, pool user, required extensions, and maintenance owner. This prevents a future administrator from changing a socket in one file and leaving the corresponding virtual host pointed at the old endpoint.
Choosing an approach for your deployment
| Decision axis | Unix socket on one host | TCP or isolated service |
|---|---|---|
| Transport | Local filesystem socket selected in the Apache handler. | Local or isolated network listener selected by address and port. |
| Isolation | All services share the host kernel, filesystem, and resource pool. | Useful with containers or network namespaces; isolation depends on the platform configuration. |
| Package lifecycle | Usually follows the host distribution’s PHP packages and service units. | Can follow a separately managed image or service, but adds another lifecycle to patch. |
| Per-site boundary | Separate pools, users, socket ownership, and filesystem permissions provide the boundary. | Can add a process or namespace boundary, while still requiring correct pool and network permissions. |
| Operational cost | Fewer moving parts, but every service and pool must still be monitored. | More endpoints, networking, and deployment configuration to operate. |
For ordinary sites on one machine, versioned Unix sockets and explicit per-virtual-host handlers are the simplest design. Choose TCP or stronger isolation when your deployment already separates services or when a site requires an independent lifecycle.
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Final implementation checklist
- Every required PHP branch is supported by the target operating-system release.
- Each branch has its own FPM service and at least one pool.
- Every pool listens on a unique socket or TCP port.
- Apache has
proxyandproxy_fcgienabled, plus the environment support required by the configuration. - No global PHP handler overrides the virtual-host rules.
- Each
<VirtualHost>maps.phprequests to the intended endpoint and supplies the correct script path. - Apache passes
apachectl configtestbefore every reload. - Version and FPM SAPI have been verified per hostname, then diagnostic files removed.
- Socket permissions, pool users, extensions, worker limits, and logs are documented per site.
- Apache connection limits and every FPM pool’s
pm.max_childrenhave been considered together.
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