Support Redis cache [RELEASED]: Page 4 - Enhance Control Panel

Support Redis cache [RELEASED]

AdamM

gavin dragonflydb release production ready version 1.0
I would like to use this instead of redis.
My guess is that the enhance team will do the redis integration first but I would really like to use dragonflydb instead of redis.
I hope the Enhance team will also do this and it will be possible to change it like with web servers.

Aliysa_Enhance

Hi AdamM, at the moment we only have plans for Redis. IF you haven't already, can I please ask that you create a different feature request thread for dragonflydb so we can track popularity for this feature. Thanks!

timbr

+1 for Relay.

If we're getting Redis, it would be awesome to have the latest greatest client with it as an option, instead of just PhpRedis.

Zoinkies

[unknown] +1 Relay wouldn't be a massive ask to implement!

alexandre

+1 for Relay.

antonijo01

While you are thinking about implementation, please see:
https://relay.so/
https://www.youtube.com/watch?v=Z1TEp2rVVwg

https://managingwp.io/2022/06/09/alternatives-to-redis-dragonfly-and-cachegrand/

Aliysa_Enhance

Adam Our plan is to make Redis a package setting which will enable customers to create a Redis instance within their PHP container. They will be able to connect to it on 127.0.0.1 and it won't be shared or accessible to any other website or container.

Redis is now available in 9.7.0 core https://enhance.com/support/release-notes

AdamM

Aliysa_Enhance
Amazing work Enhance team. Thank you. I am currently changing the use of redis with your function. Everything seems to be working fine. I will definitely do more tests with redis.conf settings and let you know how it looks.

AdamM

Aliysa_Enhance
Okay, these are my first thoughts.
Can't you use the latest version? I see this is 6.0.16 which was released on 04-Oct-2021

I've made some changes to redis.conf and I'm getting these logs

3:C 18 Aug 2023 13:18:49.979 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
3:C 18 Aug 2023 13:18:49.979 # Redis version=6.0.16, bits=64, commit=00000000, modified=0, pid=3, just started
3:C 18 Aug 2023 13:18:49.979 # Configuration loaded
3:M 18 Aug 2023 13:18:49.980 * Increased maximum number of open files to 20032 (it was originally set to 1024).
3:M 18 Aug 2023 13:18:49.980 * Running mode=standalone, port=6379.
3:M 18 Aug 2023 13:18:49.980 # WARNING: The TCP backlog setting of 65536 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 4096.
3:M 18 Aug 2023 13:18:49.980 # Server initialized
3:M 18 Aug 2023 13:18:49.980 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
3:M 18 Aug 2023 13:18:49.980 * Ready to accept connections

"The TCP backlog setting of 65536 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 4096."

This is not true, on my server it is 1048576 which is much more and there is a problem with setting it.
What could it be caused by?

Adam

AdamM Can't you use the latest version? I see this is 6.0.16 which was released on 04-Oct-2021

We install the Ubuntu apt package for Redis which is different depending whether you're using PHP version you're using, it's currently 20.04 for PHP <= 8.0 and 22.04 for PHP > 8.0. It's possible in future we could build Ubuntu packages with later versions if that's something people require.

AdamM "The TCP backlog setting of 65536 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 4096."

This is not true, on my server it is 1048576 which is much more and there is a problem with setting it.
What could it be caused by?

The PHP containers have their own network namespace which I believe has separate kernel network parameters. There is no way you are going to be making 4096 connections to Redis from a single website, this isn't something to worry about.

AdamM

Adam
I think it would be great if Enhance are using a newer version of Redis, especially since 7v has a lot of performance improvements.

I see this issue is more complex, requires sysctl to be set in Dockerfile or docker-compose.yml
Maybe in the future it will be possible, maybe Enhance can release such functions?
https://www.cloudbees.com/blog/adjusting-linux-kernel-parameters-with-docker-compose

Adrien

I completely agree with Adam and in general it would be very good to mention in the roadmap + in your KB the versions Enhance is currently using for each element of it's stack.

Congratulations for 9.7! This came as a good suprise.

Adam

The version isn't static - when Ubuntu release a new package Redis will be updated in the PHP container. If we release our own package for Redis then this will be on the release notes.

The PHP containers are not Docker but the principle is the same, we can potentially expose sysctl variables to the master organisation. However in this case I don't see any benefit in sysctl tuning.

standtech

I tested Redis on the host and Wordpress on a container. For weird reasons, after every host reboot, I had to restart Redis once more and clear object-cache.php file or else it complained about the connection. what's ur experience?

AdamM

standtech
It's strange... I don't have this problem with litespeed cache. Maybe it's the plugin's fault? Which one do you use?

Adam

standtech I tested Redis on the host and Wordpress on a container. For weird reasons, after every host reboot, I had to restart Redis once more and clear object-cache.php file or else it complained about the connection. what's ur experience?

If you have installed Redis on the host system, this is no longer necessary. If you have Enhance 9.7.0 you can just enable the Redis toggle under "developer tools" and Redis will start automatically inside the PHP container. Your WordPress site can connect on 127.0.0.1.

george

Bravo! Excellent work Enhance team!
Everything works fast and smoothly.

Adrien

I'd like to add to what Adam just mentioned.

To see the toggle under developer tools, you first need to go under package and enable Redis feature.

@Adam @Aliysa_Enhance I have a question. I have enabled Redis on my site but WordPress health tool does not seem to take object caching into account and still shows a warning.

ss88us

Adrien Have you installed, activated, and enabled a Redis WordPress plug-in too?

Zoinkies

Adrien WP doesn't have native Redis Cache, you need a plugin.

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