Php-redis not recognised by php [solved]

Emoncms
1

I was getting the following error message in emoncms:

Process 'process__kwh_to_power' not available. Redis not installed.

But redis is installed:

redis-server/stable,now 5:5.0.3-4+deb10u1
php-redis/stable,now 4.2.0-1

And redis-cli --stat and redis-cli --bigkeys produce reasonable output.

I saw that redis was disabled in /var/www/emoncms/settings.php, but if I enable it, I get

**Fatal error** : Uncaught Error: Class 'Redis' not found in /var/www/emoncms/index.php:34 Stack trace: #0 {main} thrown in **/var/www/emoncms/index.php** on line **34**

I therefore assume that php is not finding php-redis.

Any clues how to fix this?

2

Hi Jeff, what is your system? emonPi or self install? Has it ever worked? if so, what has changed, an update to PHP for instance?

This is my goto thread on redis - there are actually 3 components installed and enabled. Beware, the install has changed since that thread!!!

You can see how REDIS is currently installed here EmonScripts/redis.sh at master · openenergymonitor/EmonScripts · GitHub

3

Thanks for the swift reply. It is a self-install, which did work but probably not since I upgraded to Buster, or possibly, since a PHP upgrade.

I assume the reason for the problem is that emoncms is using php7.0, and the php-redis package in Buster only supports php7.3:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=909111

https://packages.debian.org/buster/amd64/php-redis/filelist

I don’t like installing software past the package manager. I’ll have a go at creating a .deb with php7.0 support.

Or can I upgrade emoncms to php7.3?

4

If you look at the EmonScripts docs it supports an install on Debian.

Probably the phpenmod is not correct.

No it now uses 7.3 IIRC.

5

My machine has missed an update, then, as emoncms/admin/view shows:

PHP

Version

7.0.33-0+deb9u3 (Zend Version 3.0.0)

How do I get emoncms to use php7.3?

6

No, PHP is not updated as part of the emonCMS updates - it tends to break things. The new scripts take account of the PHP version installed when configuring it for emonCMS.

The chances are upgrading to Buster in-situ probably broke the install. Do you still have 7.0 and 7.3 installed?

7

Yup. In parallel. Just removed all the php7.0 packages, installed libapache2-mod-php7.3, and emoncms suddenly is running with php7.3 :slight_smile:

And after enabling redis in settings.php, things are working! Thanks!

1 Like
8

I had same problem after an apt upgrade on buster.
After checking /etc/php7.3/mods-available I found out, that redis.ini is missing, even php-redis is installed.
On the opposite, everything looks fine in /etc/php7.4.

In apt history I can see redis-server and php-redis were updated together with many others php- packages.

So, I decided to switch from php7.3 to php7.4 for a try, and unloaded libapache2-mod-php7.3, then loaded libapache2-mod-php7.4.

Now everything looks fine :slight_smile: Later will uninstall php7.3 probably

BR
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