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

Support Redis cache [RELEASED]

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.

Adrien

Thank you @ss88us Zoinkies

Im sorry I forgot I do that using LSCP and don't need any additionnal plugin. I got used to run Woo without redis since I moved to Enhance and completely forgot this was handled by LSCP 🙂

I've got another question. Do you guys edit/fine tune anything in your redis.conf file?

Thank you

ss88us

Adrien Personally I would set;

timeout 90
tcp-keepalive 60
maxmemory 250mb
maxmemory-policy allkeys-lru
tcp-backlog 4096

timeout = Close the connection after a client is idle for 30 seconds
tcp-keepalive = keep the connection alive for 60 seconds to increase performance
maxmemory = can be lowered but should be sufficient
maxmemory-policy = Keeps most recently used keys; removes least recently used (LRU) keys
tcp-backlog = In high requests-per-second environments you need an high backlog in order to avoid slow clients connections issues. (cat /proc/sys/net/core/somaxconn for the value)

These settings by default are set to;

timeout = 0 = never times out, uses resources
tcp-keepalive = 300, 5 minutes to keep the connection alive
maxmemory = 0 = unlimited memory usage
maxmemory-policy = noeviction = which means Redis doesn't save key/values when memory limit is reached.
tcp-backlog = only 511 connections

Adrien

ss88us This is very helpful. Thank you so much mate.

kyzoeadmin

ss88us @Adam can we set these somewhere as default when users activate redis.

george

I want to recommend this plug-in for a WordPress site.
https://wordpress.org/plugins/wp-redis/

kyzoeadmin

Indeed best plugin to handle redis.

Adrien

kyzoeadmin I don't think we can from Enhance CP so I've created this feature request:

https://community.enhance.com/d/750-enforce-redisconf-settings-to-all-websites-disabling-redisconf-editing

DracoBlue

What version of redis does enhance use?

Aliysa_Enhance

DracoBlue Enhance will install the latest version of Redis from the official Ubuntu apt repository for the version of Ubuntu on which the website's PHP version is based. For PHP >= 8.1 that's 22.04 LTS. For PHP < 8.1 that's 20.04 LTS.

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