---
title: "Redis"
canonical_url: "https://www.speedzone.fi/tuki/en/kb/redis/"
post_type: "ht_kb"
published: "2026-06-02T13:12:07+00:00"
modified: "2026-06-02T13:12:07+00:00"
language: "en"
author: "kati"
taxonomies:
  ht_kb_category:
    - name: "Technical"
      url: "https://www.speedzone.fi/tuki/en/kb-categories/technical-en/"
    - name: "WordPress"
      url: "https://www.speedzone.fi/tuki/en/kb-categories/wordpress-en/"
---

# Redis

## redis-cli

To use redis-cli, next command must be used:
`> vs-redis-cli`

Information about the version of Redis, connected clients/applications, and other details can be seen using next redis-cli command:
`> info`

A full list of redis-cli commands and information about their usage can be found in the Redis documentation:
[redis.io/commands/](https://redis.io/commands/)

## Using Redis Object Cache For WordPress

For the WordPress plugin Redis Object Cache, the minimum required PHP version is 7.2. Additionally for the corresponding main or subdomain where WordPress is installed, the Redis extension under PHP extensions must be enabled, which is on by default.

 Attention! It is recommended first to make [a snapshot](https://www.speedzone.fi/tuki/en/kb/zone-application-manager/#h2application-snapshots-and-restoring-from-themh2) of the website to have a safe restore point in case something goes wrong.

### Starting the Redis Server

To start the Redis server, go to the Webhosting page in My Zone control panel, select from the menu: `Databases` > `Redis` and click on the `Enable Redis instance` button:

![](https://www.zone.ee/static/sites/5/start_redis_en.png)

 The Redis server will be started for the virtual server within 2 minutes.

Keep this page open until the necessary information for the WordPress’ wp-config.php file has been copied from here.

 Attention! If there is no Redis option under the Databases menu, then the web hosting service package must be upgraded.

### Configuration and Activation

Log into the WordPress dashboard and install and activate the new plugin called Redis Object Cache.

Next, open the WordPress configuration file `wp-config.php`.

 Files in the web server can be edited via FTP or SSH Instructions for establishing FTP and SSH connections:
[FTP – Logging in](https://www.speedzone.fi/tuki/en/kb/ftp-logging-in/)
[Establishing a SSH Connection](https://www.speedzone.fi/tuki/en/kb/establishing-an-ssh-connection/)

Add the necessary Redis configuration data to the `wp-config.php` file before the “stop editing” line located at the end of the file.

```
define( 'WP_REDIS_HOST', '127.1.23.456' );
define( 'WP_REDIS_PORT', 6379 );
define( 'WP_REDIS_PASSWORD', 'abcdefghijklm1234567890' );
define( 'WP_REDIS_CLIENT', 'phpredis' );
define( 'WP_REDIS_PREFIX', 'my-site' );
define( 'WP_REDIS_DATABASE', 0 );
define( 'WP_REDIS_TIMEOUT', 1 );
define( 'WP_REDIS_READ_TIMEOUT', 1 );
define( 'WP_REDIS_MAXTTL', 86400 );
```

Values for `WP_REDIS_HOST` ja `WP_REDIS_PASSWORD` can be found on Webhosting page in My Zone management, under `Databases` > `Redis`.

Remaining configuration details and detailed instructions can be found in the plugin documentation:
[Redis Object Cache for WordPress – Configuration](https://github.com/rhubarbgroup/redis-cache/#configuration)
[Installing Redis Object Cache – Configuring the plugin](https://github.com/rhubarbgroup/redis-cache/blob/develop/INSTALL.md#3-configuring-the-plugin)

After adding the Redis configuration into the `wp-config.php` file, reload the Redis page in the WordPress dashboard: `Settings` > `Redis`. On the `Overview` tab, Redis should now be as “Reachable”:

![](https://www.zone.ee/static/sites/5/settings_redis_en.png)Then activate Redis by clicking the `Enable Object Cache` button on the same page.

 Useful tip Redis status can also be viewed and activated via SSH using WP-CLI commands:
> wp redis status
> wp redis enable

There are additional WP-CLI commands for Redis Object Cache.
To get more information, use the next command after installing the plugin:
> wp help redis

### Usage Graphs

The usage graphs of Redis, which provide an overview of memory usage, operations, connections, and key usage, can be viewed in My Zone management, on Webhosting page, under `Databases` > `Redis`.

### Flushing Redis cache

In most cases there is no need to flush the Redis cache.
However, it can be done as a last resort if WordPress background operations or the dashboard are not functioning properly or if enabling and disabling plugins will fail.
To flush the Redis cache, go to the `Settings` > `Redis` in the WordPress dashboard and click the Flush Cache button.
The redis-cli command for this is:
`> FLUSHALL `

### WordPress error “Error establishing a Redis connection”

If WordPress displays an error message “Error establishing a Redis connection”, it means either that the Redis server is not running or the WordPress configuration file wp-config.php is missing the Redis configuration or it is incorrect.

![](https://www.zone.ee/static/sites/5/error_establishing_a_redis_connection_en.png)

## Starting Redis Server With Custom Configuration File

If configuration settings needs to be changed or logging enabled, make a copy of the existing configuration file, apply the necessary changes to it and start the Redis server as a PM2 application via the **`My Zone`** control panel.

### New Configuration

Make a copy of the existing Redis configuration file, the location of which on the server is:
`~/.zse/etc/redis-6379.cfg`

 Instructions [FTP – Logging in](https://www.speedzone.fi/tuki/en/kb/ftp-logging-in/)
[Establishing an SSH connection](https://www.speedzone.fi/tuki/en/kb/establishing-an-ssh-connection/)

Files can be copied and managed using the web-based file manager WebFTP, a separate FTP program or over an SSH connection.
Copying the Redis configuration file via SSH:

```
> /bin/cp -a ~/.zse/etc/redis-6379.cfg ~/my_redis.cfg
```

In the new configuration file, make at least the following changes (change the path to a log file to the correct one):

```
daemonize no

logfile "/data01/virt1234/redis.log"
```

If the `loglevel` setting is changed to `debug`, keep an eye on the size of the log file so that it doesn’t grow too big or add a cron job to rotate the log file.

### PM2 Application For Redis

For the PM2 application, a configuration file needs to be added to the server for this purpose.

A sample PM2 application script with the filename `redis.config.js` (change the file path inside it):

```
module.exports = {
    apps: [
        {
            name: "redis",
            script: "/usr/sbin/redis-server",
            args: "/data01/virt1234/my_redis.cfg",
            autorestart: true,
            watch: false
        }
    ]
}
```

Copy the PM2 application file `redis.config.js` to the server.

 Instruction [PM2 application setup](https://www.speedzone.fi/tuki/en/kb/installing-a-nodejs-application-on-a-speedzone-web-server/#h2pm2-application-setuph2)

Add a new PM2 application via the **`My Zone`** control panel by entering the file path to `redis.config.js` in the script location text box, and then start the new PM2 application.

### Starting The Redis Server Manually

The Redis server can also be started manually.

 Attention! It must be taken into account that in this case, the Redis server will not automatically restart after a hosting server reboot, as is done with the PM2 application!

In this case, the `daemonize yes` setting must be present in the configuration file so that the Redis server will run in the background.

Starting the Redis server via SSH terminal (change the path to a file to the correct one)::

```
/usr/sbin/redis-server /data01/virt1234/my_redis.cfg
```

To stop the Redis server, you can use the `shutdown` command in the Redis CLI or the following command in the terminal. In the command, replace the IP address and password with the ones specified in the Redis configuration file:

```
/usr/bin/redis-cli -h 127.1.23.456 -p 6379 -a redis_password shutdown
```