El servidor de mi cliente recientemente comenzó a tener problemas de rendimiento. El único sitio web alojado en el servidor se carga muy lentamente. Está construido con WordPress usando un tema personalizado. Hay una cantidad mínima de complementos instalados y no se agregó ninguno en las últimas semanas cuando comenzaron los problemas de rendimiento.
El servidor tiene 2 CPU y 2 GB de memoria. La pila del servidor es LAMP con Ubuntu 20.04 y PHP FPM. Todo el software instalado se mantiene actualizado.
Ambas CPU utilizan constantemente más del 80% mientras ejecutan el sitio de WordPress.
El comando free -m devuelve lo siguiente: Total 1983, Usado 1734, Gratis 64, Compartido 132, Buff/Cache 184 y Disponible 12.
Reiniciar el servidor resuelve temporalmente estos problemas.
Redis Server está instalado para el almacenamiento en caché de objetos. Actualmente no hay ningún otro complemento de optimización o almacenamiento en caché instalado en el servidor o en WordPress.
Ejecuté sudo tail -n 10 /var/log/apache2/domain.com_error.logy incluí el resultado a continuación.
[Mon Feb 20 09:59:27.377362 2023] [proxy_fcgi:error] [pid 310468] [client 104.224.117.81:33410] AH01071: Got error 'PHP message: Predis\\Response\\ServerException: LOADING Redis is loading the dataset in memory in /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php:352\nStack trace:\n#0 /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php(320): Predis\\Client->onErrorResponse()\n#1 /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php(299): Predis\\Client->executeCommand()\n#2 /var/www/example.com/wp-content/object-cache.php(562): Predis\\Client->__call()\n#3 /var/www/example.com/wp-content/object-cache.php(257): WP_Object_Cache->__construct()\n#4 /var/www/example.com/wp-includes/load.php(730): wp_cache_init()\n#5 /var/www/example.com/wp-settings.php(131): wp_start_object_cache()\n#6 /var/www/example.com/wp-config.php(109): require_once('...')\n#7 /var/www/example.com/wp-load.php(50): require_once('...')\n#8 /var/www/example.com/wp-blog-header.php(13): require_once(...', referer: https://www.example.com/listing/the-tree-corral/
[Mon Feb 20 09:59:28.858978 2023] [proxy_fcgi:error] [pid 310553] [client 157.55.39.219:22656] AH01071: Got error 'PHP message: Predis\\Connection\\ConnectionException: Connection refused [tcp://127.0.0.1:6379] in /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Connection/AbstractConnection.php:132\nStack trace:\n#0 /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Connection/StreamConnection.php(109): Predis\\Connection\\AbstractConnection->onConnectionError()\n#1 /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Connection/StreamConnection.php(154): Predis\\Connection\\StreamConnection->createStreamSocket()\n#2 /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Connection/StreamConnection.php(80): Predis\\Connection\\StreamConnection->tcpStreamInitializer()\n#3 /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Connection/AbstractConnection.php(81): Predis\\Connection\\StreamConnection->createResource()\n#4 /var/www/example.com/wp-content...'
[Mon Feb 20 09:59:28.859372 2023] [proxy_fcgi:error] [pid 310553] [client 157.55.39.219:22656] AH01071: Got error 'PHP message: PHP Warning: Undefined variable $image in /var/www/example.com/wp-content/themes/themename/functions.php on line 548'
[Mon Feb 20 09:59:32.089611 2023] [proxy_fcgi:error] [pid 310501] [client 157.55.39.219:24128] AH01071: Got error 'PHP message: Predis\\Response\\ServerException: LOADING Redis is loading the dataset in memory in /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php:352\nStack trace:\n#0 /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php(320): Predis\\Client->onErrorResponse()\n#1 /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php(299): Predis\\Client->executeCommand()\n#2 /var/www/example.com/wp-content/object-cache.php(562): Predis\\Client->__call()\n#3 /var/www/example.com/wp-content/object-cache.php(257): WP_Object_Cache->__construct()\n#4 /var/www/example.com/wp-includes/load.php(730): wp_cache_init()\n#5 /var/www/example.com/wp-settings.php(131): wp_start_object_cache()\n#6 /var/www/example.com/wp-config.php(109): require_once('...')\n#7 /var/www/example.com/wp-load.php(50): require_once('...')\n#8 /var/www/example.com/wp-blog-header.php(13): require_once(...'
[Mon Feb 20 09:59:32.089919 2023] [proxy_fcgi:error] [pid 310501] [client 157.55.39.219:24128] AH01071: Got error 'PHP message: PHP Warning: Undefined variable $image in /var/www/example.com/wp-content/themes/themename/functions.php on line 548'
[Mon Feb 20 09:59:32.285842 2023] [proxy_fcgi:error] [pid 310279] [client 185.191.171.4:8256] AH01071: Got error 'PHP message: Predis\\Response\\ServerException: LOADING Redis is loading the dataset in memory in /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php:352\nStack trace:\n#0 /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php(320): Predis\\Client->onErrorResponse()\n#1 /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php(299): Predis\\Client->executeCommand()\n#2 /var/www/example.com/wp-content/object-cache.php(562): Predis\\Client->__call()\n#3 /var/www/example.com/wp-content/object-cache.php(257): WP_Object_Cache->__construct()\n#4 /var/www/example.com/wp-includes/load.php(730): wp_cache_init()\n#5 /var/www/example.com/wp-settings.php(131): wp_start_object_cache()\n#6 /var/www/example.com/wp-config.php(109): require_once('...')\n#7 /var/www/example.com/wp-load.php(50): require_once('...')\n#8 /var/www/example.com/wp-blog-header.php(13): require_once(...'
[Mon Feb 20 09:59:32.286079 2023] [proxy_fcgi:error] [pid 310279] [client 185.191.171.4:8256] AH01071: Got error 'PHP message: PHP Warning: Undefined variable $image in /var/www/example.com/wp-content/themes/themename/functions.php on line 548'
[Mon Feb 20 09:59:32.561144 2023] [proxy_fcgi:error] [pid 309940] [client 185.191.171.19:16376] AH01071: Got error 'PHP message: Predis\\Response\\ServerException: LOADING Redis is loading the dataset in memory in /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php:352\nStack trace:\n#0 /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php(320): Predis\\Client->onErrorResponse()\n#1 /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php(299): Predis\\Client->executeCommand()\n#2 /var/www/example.com/wp-content/object-cache.php(562): Predis\\Client->__call()\n#3 /var/www/example.com/wp-content/object-cache.php(257): WP_Object_Cache->__construct()\n#4 /var/www/example.com/wp-includes/load.php(730): wp_cache_init()\n#5 /var/www/example.com/wp-settings.php(131): wp_start_object_cache()\n#6 /var/www/example.com/wp-config.php(109): require_once('...')\n#7 /var/www/example.com/wp-load.php(50): require_once('...')\n#8 /var/www/example.com/wp-blog-header.php(13): require_once(...'
[Mon Feb 20 09:59:33.157553 2023] [proxy_fcgi:error] [pid 310553] [client 157.55.39.219:22656] AH01071: Got error 'PHP message: Predis\\Response\\ServerException: LOADING Redis is loading the dataset in memory in /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php:352\nStack trace:\n#0 /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php(320): Predis\\Client->onErrorResponse()\n#1 /var/www/example.com/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php(299): Predis\\Client->executeCommand()\n#2 /var/www/example.com/wp-content/object-cache.php(562): Predis\\Client->__call()\n#3 /var/www/example.com/wp-content/object-cache.php(257): WP_Object_Cache->__construct()\n#4 /var/www/example.com/wp-includes/load.php(730): wp_cache_init()\n#5 /var/www/example.com/wp-settings.php(131): wp_start_object_cache()\n#6 /var/www/example.com/wp-config.php(109): require_once('...')\n#7 /var/www/example.com/wp-load.php(50): require_once('...')\n#8 /var/www/example.com/wp-blog-header.php(13): require_once(...'
[Mon Feb 20 09:59:33.157733 2023] [proxy_fcgi:error] [pid 310553] [client 157.55.39.219:22656] AH01071: Got error 'PHP message: PHP Warning: Undefined variable $image in /var/www/example.com/wp-content/themes/themename/functions.php on line 548'
¿Alguna sugerencia sobre cómo abordar estos problemas?
Soy administrador de servidores novato, pero tengo muchas ganas de aprender.