vellnes

I finally found the problem
In my redis settings, in the advanced settings of each caching method – I had to specify the path to redis in the admin area
Previously, I did not notice this setting, and there by default 127.0.0.1

Initially, the plugin did not see redis at all, so I could not select the redis caching method.
So I couldn’t change these settings.
After I added:

define('W3TC_CONFIG_CACHE_ENGINE', 'redis');
define('W3TC_CONFIG_CACHE_REDIS_SERVERS', 'redis:6379');

I started to see redis as a caching method, but it still didn’t work, because of those advanced settings in admin panel

Please make the redis path setting global, at the top level of the plugin settings, or the ability to configure this parameter within each caching method, without selecting redis (because in the beginning with my configuration, the plugin didn’t see redis at all)

Hello @vmarko

I’m trying to show the plugin that redis is there, but not on localhost
Without any customization, the plugin can’t see redis

How can I configure caching using redis (with custom url)?
I would be grateful for a detailed response

Hello @vmarko

I hooked up the radis without using this config.
And there was a log of endless attempts to connect to redis on localhost

I tried to add it (/wp-content/plugins/w3-total-cache/ini/config-db.php, right?) — nothing changed.
Below is the content of the configuration that I made

define('W3TC_CONFIG_DATABASE', true);

define('W3TC_CONFIG_CACHE_ENGINE', 'redis');
define('W3TC_CONFIG_CACHE_REDIS_SERVERS', 'redis:6379');
define('W3TC_CONFIG_CACHE_REDIS_VERIFY_TLS_CERTIFICATES', false);

Using the command tcpdump -i any port 6379 inside the container with WP, I get a long log of how the plugin tries to check the connection to redis and fails to find it (a successful connection to another redis is also visible, there the data exchange is normal)
After disabling the w3tc plugin, this log is gone

17:10:17.773500 lo    In  IP localhost.60380 > localhost.6379: Flags [S], seq 599777928, win 65495, options [mss 65495,sackOK,TS val 1088607838 ecr 0,nop,wscale 7], length 0
17:10:17.773504 lo    In  IP localhost.6379 > localhost.60380: Flags [R.], seq 0, ack 1437402834, win 0, length 0
17:10:17.775904 lo    In  IP localhost.60396 > localhost.6379: Flags [S], seq 2333168516, win 65495, options [mss 65495,sackOK,TS val 1088607840 ecr 0,nop,wscale 7], length 0
17:10:17.775909 lo    In  IP localhost.6379 > localhost.60396: Flags [R.], seq 0, ack 610208718, win 0, length 0
17:10:17.777802 lo    In  IP localhost.60404 > localhost.6379: Flags [S], seq 3700970019, win 65495, options [mss 65495,sackOK,TS val 1088607842 ecr 0,nop,wscale 7], length 0
17:10:17.777806 lo    In  IP localhost.6379 > localhost.60404: Flags [R.], seq 0, ack 551556151, win 0, length 0
17:10:17.777867 lo    In  IP localhost.60406 > localhost.6379: Flags [S], seq 2215180403, win 65495, options [mss 65495,sackOK,TS val 1088607842 ecr 0,nop,wscale 7], length 0
17:10:17.777870 lo    In  IP localhost.6379 > localhost.60406: Flags [R.], seq 0, ack 2025716921, win 0, length 0

I tried making changes to the following files, but still attempts to connect to localhost remain

/plugins/w3-total-cache/ini/config-db-sample.php
/plugins/w3-total-cache/ini/config-db.php
/plugins/w3-total-cache/Extension_FragmentCache_Plugin.php
/plugins/w3-total-cache/ConfigKeys.php
/w3tc-config/master.php - After saving the settings in the admin, the file is overwritten. After making my changes, it still doesn't take them into consideration(

Also I tried to get more information for you, I modified the Redis_Cache.php file by adding my code to it

error_log("================================");
error_log("Config - " . json_encode($config));
error_log("================================");

...

error_log("================================");
error_log("Key - " . json_encode($key));
error_log("Accessors - " . json_encode($this->_accessors));
error_log("Servers - " . json_encode($this->_servers));
error_log("Redis server - $server");
error_log("================================");

Below is an example of output, when exactly the plugin knocks on localhost, it turns out redis caching is not working correctly, because it still tries to look for values on localhost for DB Cache and Object Cache caching.

NOTICE: PHP message: ================================
NOTICE: PHP message: Config - {"servers":["127.0.0.1:6379"],"verify_tls_certificates":true,"persistent":true,"timeout":0,"retry_interval":0,"read_timeout":0,"dbid":0,"password":"","blog_id":0,"module":"object","host":"debug.roses.ee","instance_id":219741501}
NOTICE: PHP message: ================================
NOTICE: PHP message: ================================
NOTICE: PHP message: Key - "w3tc_219741501_debug.roses.ee_0_object_0defaultis_blog_installed"
NOTICE: PHP message: Accessors - []
NOTICE: PHP message: Servers - ["127.0.0.1:6379"]
NOTICE: PHP message: Redis server - 127.0.0.1:6379
NOTICE: PHP message: ================================
NOTICE: PHP message: ================================
NOTICE: PHP message: Key - "w3tc_219741501_debug.roses.ee_0_object_0optionsalloptions"
NOTICE: PHP message: Accessors - [null]
NOTICE: PHP message: Servers - ["127.0.0.1:6379"]
NOTICE: PHP message: Redis server - 127.0.0.1:6379
NOTICE: PHP message: ================================

...

NOTICE: PHP message: ================================
NOTICE: PHP message: Config - {"servers":["redis:6379"],"verify_tls_certificates":true,"persistent":true,"dbid":0,"password":"","timeout":0,"retry_interval":0,"read_timeout":0,"key_version_mode":"disabled","blog_id":"0","module":"config","host":"","instance_id":0}
NOTICE: PHP message: ================================
NOTICE: PHP message: ================================
NOTICE: PHP message: Key - "w3tc_0__0_config_w3tc_config_0"
NOTICE: PHP message: Accessors - []
NOTICE: PHP message: Servers - ["redis:6379"]
NOTICE: PHP message: Redis server - redis:6379
NOTICE: PHP message: ================================

...

NOTICE: PHP message: ================================
NOTICE: PHP message: Config - {"servers":["127.0.0.1:6379"],"verify_tls_certificates":true,"persistent":true,"timeout":0,"retry_interval":0,"read_timeout":0,"dbid":0,"password":"","module":"dbcache","host":"debug.roses.ee","instance_id":219741501,"blog_id":0}
NOTICE: PHP message: ================================
NOTICE: PHP message: ================================
NOTICE: PHP message: Key - "w3tc_219741501_0_dbcache_options_key_version"
NOTICE: PHP message: Accessors - []
NOTICE: PHP message: Servers - ["127.0.0.1:6379"]
NOTICE: PHP message: Redis server - 127.0.0.1:6379
NOTICE: PHP message: ================================
NOTICE: PHP message: ================================
NOTICE: PHP message: Key - "w3tc_219741501_debug.roses.ee_0_object_0optionscron"
NOTICE: PHP message: Accessors - [null]
NOTICE: PHP message: Servers - ["127.0.0.1:6379"]
NOTICE: PHP message: Redis server - 127.0.0.1:6379
NOTICE: PHP message: ================================
NOTICE: PHP message: ================================
NOTICE: PHP message: Key - "w3tc_219741501_debug.roses.ee_0_object_0optionsalloptions"
NOTICE: PHP message: Accessors - [null]
NOTICE: PHP message: Servers - ["127.0.0.1:6379"]
NOTICE: PHP message: Redis server - 127.0.0.1:6379
NOTICE: PHP message: ================================

Is it coming out that the plugin can’t be configured to a custom host at this point? Or how can I do that?
No matter what I try, I get the same result, the plugin knocks on localhost
Maybe you can tell me where I’m wrong, or what I need to fix.
Or where these settings for each plugin are pulled from, where the localhost is specified.

I really need help with the correct configuration.
Even if I have to change something in the plugin files, or in the database.

Hello @vmarko
Maybe there are some updates?