To store PHP sessions in Redis on Ubuntu, install the Redis server and the PHP Redis extension, set session.save_handler = redis and a phpredis session.save_path in the php.ini used by your web server, restart PHP-FPM or Apache, and verify that requests create Redis session traffic. The exact configuration file depends on your PHP version and SAPI, so changing the CLI configuration alone may have no effect on a website.
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What Redis session handling changes
PHP normally stores session data in files on the local machine. With the Redis handler, PHP serializes the session and sends it to a Redis server under a generated key. Each request that calls session_start() reads that key, and a request that changes the session writes it back. Redis can therefore provide one session store for several web servers, provided every server can reach the same Redis instance and uses compatible settings.
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Redis is not a replacement for PHP’s session API. Your application still calls session_start(), reads values from $_SESSION, and controls lifetime with PHP session settings. Only the storage handler changes.
Prerequisites and decisions
- An Ubuntu system with administrative access and a supported PHP installation.
- A web SAPI to configure: PHP-FPM behind a web server, Apache’s PHP module, or another SAPI.
- A Redis endpoint reachable from that PHP process. The local default is
127.0.0.1:6379. - The
php-redisextension installed for the same PHP installation that runs your site. - A decision about whether Redis is local to the application or shared by multiple machines. A shared deployment requires network controls and usually authentication.
Package names and available PHP versions vary by Ubuntu release. The commands below use the package names reported by common Ubuntu tutorials; confirm that redis-server and php-redis resolve for your release and PHP version before applying them.
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Install Redis and the PHP extension
-
Refresh package metadata:
sudo apt update -
Install the server and extension:
sudo apt install redis-server php-redisIf your host has multiple PHP versions, check that the extension is enabled for the version used by your site. A CLI check such as
php -m | grep -i redisonly describes the CLI SAPI; it does not prove that PHP-FPM or Apache loaded the extension. -
Confirm that Redis is running:
sudo systemctl status redis-server
redis-cli pingA healthy local server normally answers
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Find the php.ini that your website actually uses
Ubuntu keeps separate configuration trees for different PHP versions and SAPIs. Typical paths include:
/etc/php/8.3/fpm/php.inifor PHP-FPM./etc/php/8.3/apache2/php.inifor Apache’s PHP module./etc/php/8.3/cli/php.inifor command-line scripts.
The 8.3 directory is an example, not a requirement. Replace it with the version installed on your machine. To identify the CLI version and loaded file, run:
php --version
php --iniFor a web request, create a temporary page containing <?php phpinfo();, open it through the same virtual host as your application, and read the “Loaded Configuration File” value. Remove that page immediately after checking it because phpinfo() exposes environment details.
Do not assume that editing the CLI file changes PHP-FPM. A frequent failure pattern is a successful php -m check followed by a website that still reports file-based sessions because the FPM pool loaded a different configuration tree.
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Open the php.ini identified for the web SAPI and set these directives:
session.save_handler = redis
session.save_path = "tcp://127.0.0.1:6379"Keep the value in quotes. The tcp:// scheme tells phpredis to connect over TCP to the local Redis listener. If Redis runs on another host, replace the address with that host’s private address or DNS name and apply firewall rules before exposing the service.
Leave unrelated session directives unchanged until the basic connection works. PHP’s session lifetime, cookie attributes, garbage-collection settings, and application-level logout logic remain separate from the Redis connection string.
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Add authentication, a database, or a key prefix
phpredis accepts connection parameters in a query string appended to session.save_path. A representative form is:
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| Option | Example | Purpose and cautions |
|---|---|---|
| Host and port | tcp://127.0.0.1:6379 |
Defines the Redis endpoint. Use a private address for a remote server and restrict access with a firewall. |
| Password | auth=yourpassword |
A single-value form appears in working configurations. Verify the accepted form for your phpredis release. |
| Username and password | auth[]=user&auth[]=password |
The array form is shown in phpredis connection examples for ACL credentials. Confirm support in your installed release. |
| Logical database | database=1 |
Stores sessions in Redis database 1 instead of the default database 0. It is a namespace, not a security boundary. |
| Prefix | prefix=myapp_session: |
Adds an application-specific prefix so keys are easy to identify and less likely to collide with other data. |
| Persistent connection | persistent=1 |
Can be used in connection strings supported by phpredis. Test connection reuse with your PHP-FPM worker model before enabling it broadly. |
| Weight | weight=1 |
Relevant when using multiple listed hosts; it has no useful effect for one endpoint. |
Passwords containing characters such as &, ?, or spaces must be percent-encoded so they are not interpreted as query-string separators. Store the resulting value with permissions that prevent ordinary users from reading it.
Unix-socket alternative
When Redis and PHP share a machine, phpredis can use a Unix socket instead of TCP. An example documented in phpredis material is:
session.save_path = "unix:///var/run/redis/redis.sock?persistent=1&weight=1&database=0"The socket path and permissions must match your distribution. The PHP-FPM or Apache user needs permission to open the socket; otherwise the handler will fail even though redis-cli works for an administrator.
Multiple Redis hosts
phpredis supports listing multiple hosts separated by commas in the save path. This is not automatically equivalent to a fully coordinated Redis cluster. The documented locking behavior is limited to a single-master setup, such as a traditional master/replica arrangement managed with Sentinel. Treat multi-host session routing as a topology decision: verify how your phpredis release selects a host, handles failover, and maintains session consistency before using it for authentication sessions.
Restart the SAPI that serves the application
Configuration changes are read when PHP workers start. Restart the service that owns the web requests:
sudo systemctl restart php8.3-fpmReplace 8.3 with your installed FPM version. For Apache’s PHP module, restart Apache instead:
sudo systemctl restart apache2If a reverse proxy forwards requests to a separate PHP-FPM host, restart FPM on that host, not only the proxy. A graceful reload may be preferable on a busy site, but use the service procedure appropriate to your deployment and confirm that new workers loaded the changed file.
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Verify that PHP is writing sessions to Redis
Use an observable test rather than assuming that a restarted service applied the setting.
-
In one terminal, start the Redis monitor:
redis-cli monitorThis prints commands received by the selected Redis server. Keep the terminal restricted because monitor output can reveal session-related data and command arguments.
-
Create a temporary PHP page in the same virtual host:
<?php
session_start();
$_SESSION['redis_probe'] = date('c');
echo 'Session ID: ' . session_id(); -
Load the page twice in the same browser. The monitor should show session reads and writes. Depending on your phpredis and Redis versions, you may see commands based on
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Optionally inspect keys using the configured prefix:
redis-cli keys 'PHPREDIS_SESSION:*'
redis-cli keys 'myapp_session:*'The commonly reported default prefix is
PHPREDIS_SESSION:, but an explicit prefix is safer when Redis is shared. Avoid running theKEYScommand on a large production database because it can block while scanning every key; use a controlled test database or an incremental scan procedure instead. -
Delete the test page and stop monitoring when finished.
If no Redis traffic appears, inspect the web SAPI’s phpinfo() output, confirm that the Redis extension is loaded there, and verify that the edited session.save_path is the active value.
Session expiration, restarts, and persistence
Redis-backed sessions still expire according to the TTL PHP supplies through the session handler and your PHP session settings. Redis key expiration is not the same as PHP’s file-session garbage collection; do not infer one system’s behavior from the other. Test an actual login, idle timeout, and logout flow with your application’s configured lifetime.
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Redis data does not necessarily survive a Redis restart. Sessions survive a restart only when Redis persistence is configured in redis.conf and the resulting recovery meets your availability requirements. The appropriate persistence mode and directives depend on your Ubuntu and Redis deployment, so inspect the active configuration and test a controlled restart rather than assuming that every installation preserves session keys.
Many applications intentionally accept losing sessions during a Redis outage and force users to sign in again. Others require session continuity and plan backups, replication, and recovery. Decide this behavior explicitly; Redis persistence cannot compensate for an untested failover plan.
Concurrent requests and session locking
Two simultaneous requests from one browser can both open the same session. Without effective locking, each request may read an older copy and the last write can overwrite the other request’s changes. This is especially visible with parallel AJAX calls that update different session fields.
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redis.session.locking_enabledredis.session.lock_expireredis.session.lock_wait_time, reported in microseconds with a commonly cited default of 2,000redis.session.lock_retries, with a commonly cited default of 10
These names and defaults should be checked against the README and phpinfo() output for your installed extension before use. Enable and tune locking only after measuring request patterns; a very short lock expiration can permit overlapping writers, while a long wait can increase latency.
Test failure behavior as well. An issue report describes a case where a two-second connection timeout in the parameters did not end a script promptly when Redis was stopped. Your application should have an explicit outage policy, such as returning a controlled error, bypassing nonessential session writes, or directing traffic to a healthy node. Do not assume that a timeout value guarantees an upper bound on total request time.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Secure a Redis session store
- Redis commonly binds to localhost by default. Keep that arrangement when PHP and Redis are on the same host.
- If several application servers share Redis, bind Redis only to the required private interfaces and firewall port 6379 so it is not reachable from the public internet.
- Configure authentication appropriate to your Redis version, and use ACL credentials when supported. Put credentials in protected configuration files rather than source control.
- Use a dedicated logical database or prefix for sessions, but remember that logical databases and prefixes do not isolate an attacker who can authenticate to Redis.
- Restrict access to
redis-cli monitor, key inspection, and administrative commands because session identifiers and values may be sensitive. - Use TLS or a private encrypted network when traffic crosses untrusted networks, if your Redis and phpredis versions support the required TLS configuration.
- Rotate credentials and invalidate sessions after a suspected credential exposure.
Common failures and fixes
“Class Redis” or extension-not-found errors
The php-redis package may be installed for one PHP version while the website runs another. Check the web SAPI’s phpinfo() page, install the matching extension package, and restart the correct service.
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You probably edited the CLI php.ini, an inactive version directory, or a pool-specific override. Confirm the loaded configuration through the website, search for duplicate session.save_handler and session.save_path directives, then restart PHP-FPM or Apache.
“Connection refused” or timeout errors
Check systemctl status redis-server, run redis-cli ping from the PHP host, and verify the host and port in the save path. For a remote endpoint, inspect firewall rules and Redis bind settings. A successful connection from an administrator’s shell does not prove that the web worker can reach the same address.
Authentication failures
Verify the password or ACL username, percent-encode reserved characters, and confirm the parameter syntax supported by your phpredis release. Test with the same credentials using a Redis client before restarting PHP again.
Sessions disappear after a restart
Check whether Redis persistence is enabled and whether the restart was a planned service restart, a host reboot, or a failover. If losing sessions is unacceptable, test persistence and recovery and document the expected behavior.
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Users are logged out intermittently behind a load balancer
Confirm that every PHP server points to the same Redis endpoint, database, and prefix. Check clock-independent session expiry settings and inspect monitor output on the shared Redis instance. A per-host Redis server causes each load-balanced request to see a different session store.
Requests hang when Redis is unavailable
Do not rely solely on a nominal connection timeout. Reproduce the outage in staging, measure total request time, and configure application and web-server limits that fail predictably. Review lock wait and retry settings for your extension version.
Redis versus file and database sessions
| Consideration | Redis sessions | File sessions | Database sessions |
|---|---|---|---|
| Shared storage across web servers | Yes, when all servers reach the same Redis instance and use identical settings. | Not by default; requires shared storage or sticky routing. | Yes, when every server uses the same database and table design. |
| Persistence across restarts | Depends on Redis persistence and recovery configuration. | Depends on the local filesystem and cleanup behavior. | Usually tied to database durability and backup policy. |
| Expiry behavior | Redis key TTLs plus PHP session settings. | PHP session settings plus file garbage collection. | Application or database cleanup plus PHP session settings. |
| Concurrent requests | Requires correctly configured phpredis locking and a supported topology. | Depends on the file handler’s locking behavior. | Depends on transaction and locking design. |
| Network exposure | Requires securing the Redis listener, especially for remote access. | No session network port when stored locally. | Requires securing the database connection. |
Redis is a strong fit when several PHP workers or servers need low-latency shared sessions and you can operate Redis securely. Local files remain simpler for a single server. A database may be preferable when operational standards already require database durability and auditing, although it adds database query and contention considerations.
Production checklist
- Install
redis-serverand thephp-redisextension matching the web PHP version. - Verify the active FPM or Apache
php.ini, not only the CLI configuration. - Set
session.save_handler = redisand a testedtcp://or Unix-socket save path. - Choose an explicit prefix and, when appropriate, a dedicated Redis logical database.
- Confirm authentication syntax and percent-encode reserved password characters.
- Restart the SAPI and verify with
redis-cli monitorand a temporary session page. - Test expiration, concurrent requests, Redis restarts, failover, and an unavailable-Redis scenario.
- Keep Redis off public interfaces, restrict port 6379, and protect credentials and diagnostic commands.
- Document whether sessions are allowed to disappear during an outage and how users recover.
Frequently Asked Questions
Do I need to change my PHP application code?
Usually no. Existing code that calls session_start() continues to use $_SESSION; the storage change is made in PHP configuration. Test application-specific serialization and logout behavior after switching handlers.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchWhy does changing /etc/php/8.3/cli/php.ini not change my website?
The website normally uses PHP-FPM or Apache, each with its own configuration path. Find the loaded file through the web SAPI’s phpinfo() output, edit that file, and restart the corresponding service.
Can I use Redis on another server?
Yes, but set the save path to the reachable private address, secure authentication, restrict firewall access, and verify latency and failure behavior. Never expose an unauthenticated Redis listener to the public internet.
What happens to sessions if Redis stops?
Requests may fail, wait, or lose session access depending on connection, retry, and locking behavior. Test an outage with your exact phpredis version; a nominal timeout does not guarantee that the entire PHP request ends within that interval.
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