Cannot get Redis with Unix socket to work on Centos 8 Stream

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Nextcloud version : 21.0.3
Operating system and version: CentOS Stream release 8
Apache or nginx version: nginx/1.19.10
PHP version: 8.0.10 (Remi’s repository)

I am trying to enable memcache.distributed using Redis with a Unix socket, but when I do, I get the following error in the web browser:

Internal Server Error

The server encountered an internal error and was unable to complete your request.

Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report.

More details can be found in the server log.

The output of your Nextcloud log:

{"reqId":"lQljvT1BHd6KH4qB75zB","level":3,"time":"August 28, 2021 17:17:21","remoteAddr":"192.168.0.107","user":"--","app":"index","method":"GET","url":"/nextcloud/index.php/settings/admin/logging","message":{"Exception":"RedisException","Message":"Permission denied","Code":0,"Trace":[{"file":"/usr/share/nextcloud/lib/private/RedisFactory.php","line":92,"function":"connect","class":"Redis","type":"->"},{"file":"/usr/share/nextcloud/lib/private/RedisFactory.php","line":108,"function":"create","class":"OC\\RedisFactory","type":"->"},{"file":"/usr/share/nextcloud/lib/private/Memcache/Redis.php","line":43,"function":"getInstance","class":"OC\\RedisFactory","type":"->"},{"file":"/usr/share/nextcloud/lib/private/Memcache/Factory.php","line":125,"function":"__construct","class":"OC\\Memcache\\Redis","type":"->"},{"file":"/usr/share/nextcloud/lib/private/User/Manager.php","line":102,"function":"createDistributed","class":"OC\\Memcache\\Factory","type":"->"},{"function":"__construct","class":"OC\\User\\Manager","type":"->"},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":101,"function":"newInstanceArgs","class":"ReflectionClass","type":"->"},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":109,"function":"buildClass","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":126,"function":"resolve","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/usr/share/nextcloud/lib/private/ServerContainer.php","line":162,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":56,"function":"query","class":"OC\\ServerContainer","type":"->"},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":177,"function":"get","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":155,"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/usr/share/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php","line":114,"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":122,"function":"offsetGet","class":"Pimple\\Container","type":"->"},{"file":"/usr/share/nextcloud/lib/private/ServerContainer.php","line":137,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":56,"function":"query","class":"OC\\ServerContainer","type":"->"},{"file":"/usr/share/nextcloud/lib/private/Server.php","line":1574,"function":"get","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/usr/share/nextcloud/lib/private/Files/View.php","line":121,"function":"getUserManager","class":"OC\\Server","type":"->"},{"file":"/usr/share/nextcloud/lib/private/Server.php","line":430,"function":"__construct","class":"OC\\Files\\View","type":"->"},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":155,"function":"OC\\{closure}","class":"OC\\Server","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/usr/share/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php","line":118,"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":122,"function":"offsetGet","class":"Pimple\\Container","type":"->"},{"file":"/usr/share/nextcloud/lib/private/ServerContainer.php","line":137,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":56,"function":"query","class":"OC\\ServerContainer","type":"->"},{"file":"/usr/share/nextcloud/lib/private/Server.php","line":1353,"function":"get","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/usr/share/nextcloud/lib/base.php","line":588,"function":"boot","class":"OC\\Server","type":"->"},{"file":"/usr/share/nextcloud/lib/base.php","line":1076,"function":"init","class":"OC","type":"::"},{"file":"/usr/share/nextcloud/index.php","line":35,"args":["/usr/share/nextcloud/lib/base.php"],"function":"require_once"}],"File":"/usr/share/nextcloud/lib/private/RedisFactory.php","Line":92,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36","version":"21.0.3.1"}
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Class \"trashManager\" does not 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***"]},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Bootstrap/FunctionInjector.php","line":68,"function":"array_map"},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Bootstrap/BootContext.php","line":52,"function":"injectFn","class":"OC\\AppFramework\\Bootstrap\\FunctionInjector","type":"->"},{"file":"/usr/share/nextcloud/apps/files_trashbin/lib/AppInfo/Application.php","line":57,"function":"injectFn","class":"OC\\AppFramework\\Bootstrap\\BootContext","type":"->"},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Bootstrap/Coordinator.php","line":178,"function":"boot","class":"OCA\\Files_Trashbin\\AppInfo\\Application","type":"->"},{"file":"/usr/share/nextcloud/lib/private/legacy/OC_App.php","line":205,"function":"bootApp","class":"OC\\AppFramework\\Bootstrap\\Coordinator","type":"->"},{"file":"/usr/share/nextcloud/lib/private/legacy/OC_App.php","line":138,"function":"loadApp","class":"OC_App","type":"::"},{"file":"/usr/share/nextcloud/apps/dav/lib/AppInfo/Application.php","line":124,"function":"loadApps","class":"OC_App","type":"::"},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Bootstrap/Coordinator.php","line":178,"function":"boot","class":"OCA\\DAV\\AppInfo\\Application","type":"->"},{"file":"/usr/share/nextcloud/lib/private/legacy/OC_App.php","line":205,"function":"bootApp","class":"OC\\AppFramework\\Bootstrap\\Coordinator","type":"->"},{"file":"/usr/share/nextcloud/lib/private/legacy/OC_App.php","line":138,"function":"loadApp","class":"OC_App","type":"::"},{"file":"/usr/share/nextcloud/lib/private/legacy/OC_Util.php","line":203,"function":"loadApps","class":"OC_App","type":"::"},{"file":"/usr/share/nextcloud/lib/private/Files/Filesystem.php","line":267,"function":"setupFS","class":"OC_Util","type":"::"},{"file":"/usr/share/nextcloud/lib/private/Server.php","line":408,"function":"getMountManager","class":"OC\\Files\\Filesystem","type":"::"},{"file":"/usr/share/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":155,"function":"OC\\{closure}","class":"OC\\Server","type":"->","args":["*** 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not boot files_trashbinCould not resolve trashManager! Class \"trashManager\" does not exist"},"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36","version":"21.0.3.1"}
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not boot files_versionsCould not resolve OCA\\Files_Versions\\Versions\\IVersionManager! 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Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36","version":"21.0.3.1"}
{"reqId":"lQljvT1BHd6KH4qB75zB","level":3,"time":"August 28, 2021 17:17:21","remoteAddr":"192.168.0.107","user":"--","app":"core","method":"GET","url":"/nextcloud/index.php/settings/admin/logging","message":{"Exception":"RedisException","Message":"Redis server went away","Code":0,"Trace":[{"file":"/usr/share/nextcloud/lib/private/Memcache/Redis.php","line":55,"function":"get","class":"Redis","type":"->"},{"file":"/usr/share/nextcloud/lib/private/Template/JSCombiner.php","line":123,"function":"get","class":"OC\\Memcache\\Redis","type":"->"},{"file":"/usr/share/nextcloud/lib/private/Template/JSCombiner.php","line":103,"function":"isCached","class":"OC\\Template\\JSCombiner","type":"->"},{"file":"/usr/share/nextcloud/lib/private/Template/JSResourceLocator.php","line":116,"function":"process","class":"OC\\Template\\JSCombiner","type":"->"},{"file":"/usr/share/nextcloud/lib/private/Template/JSResourceLocator.php","line":72,"function":"cacheAndAppendCombineJsonIfExist","class":"OC\\Template\\JSResourceLocator","type":"->"},{"file":"/usr/share/nextcloud/lib/private/Template/ResourceLocator.php","line":79,"function":"doFind","class":"OC\\Template\\JSResourceLocator","type":"->"},{"file":"/usr/share/nextcloud/lib/private/TemplateLayout.php","line":365,"function":"find","class":"OC\\Template\\ResourceLocator","type":"->"},{"file":"/usr/share/nextcloud/lib/private/TemplateLayout.php","line":193,"function":"findJavascriptFiles","class":"OC\\TemplateLayout","type":"::"},{"file":"/usr/share/nextcloud/lib/private/legacy/OC_Template.php","line":183,"function":"__construct","class":"OC\\TemplateLayout","type":"->"},{"file":"/usr/share/nextcloud/lib/private/Template/Base.php","line":132,"function":"fetchPage","class":"OC_Template","type":"->"},{"file":"/usr/share/nextcloud/lib/private/legacy/OC_Template.php","line":332,"function":"printPage","class":"OC\\Template\\Base","type":"->"},{"file":"/usr/share/nextcloud/index.php","line":63,"function":"printExceptionErrorPage","class":"OC_Template","type":"::"}],"File":"/usr/share/nextcloud/lib/private/Memcache/Redis.php","Line":55,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36","version":"21.0.3.1"}

I have Nextcloud 21.0.3 installed on Centos Stream 8, this is just a test install. I am using PHP 8 from Remi’s repository and other then that it is a pretty basic install which other than the Redis issues does not seem to have any problems.

I have made the following changes to Redis config file so it would just be a Unix socket and added the apache user to the redis group. Please not I am using Nginx but the PHP-FPM is running as the apache user.

port 0
unixsocket /var/run/redis/redis.sock
unixsocketperm 770

OR

sudo sed -i 's/port 6379/port 0/g' /etc/redis.conf
sudo sed -i 's/# unixsocket \/tmp\/redis.sock/unixsocket \/var\/run\/redis\/redis.sock/g' /etc/redis.conf
sudo sed -i 's/# unixsocketperm 700/unixsocketperm 770/g' /etc/redis.conf
sudo gpasswd -a apache redis

Redis looks to be working fine:

sudo -u apache redis-cli -s /var/run/redis/redis.sock
redis /var/run/redis/redis.sock> ping
PONG

The Redis PHP module is enabled:

php -m | grep redis
redis

Below is what I have added to config.php that cause the error:

'redis' =>
  array (
    'host' => '/var/run/redis/redis.sock',
    'port' => '0',
  ),
'memcache.distributed' => '\\OC\\Memcache\\Redis',

OR

sudo -u apache php /usr/share/nextcloud/occ config:system:set redis host --value="/var/run/redis/redis.sock"
sudo -u apache php /usr/share/nextcloud/occ config:system:set redis port --value=0
sudo -u apache php /usr/share/nextcloud/occ config:system:set memcache.distributed --value="\OC\Memcache\Redis"

Any suggestion on how else to troubleshoot this?

2

Besides of the file permissions regarding the ownership of the rundir and socket file: Who owns /var/run/redis (and subsquently redis.sock)?

It should be
owner: redis
group: <your apache user>

(Don’t forget to restart Redis if you have made changes here)

3 
sudo ls -l /var/run/redis/redis.sock
srwxrwx---. 1 redis redis 0 Aug 29 06:34 /var/run/redis/redis.sock

It is owned by the redis group, but I have added the apache user to this group.

sudo gpasswd -a apache redis

I don’t believe this is a permission issue, as I did check that the apache user can use the redis-cli.

sudo -u apache redis-cli -s /var/run/redis/redis.sock
redis /var/run/redis/redis.sock> ping
PONG
4

I have identified the problem, this is an SELinux issue. I keep forgetting this is a thing on CentOS. When I disable SELinux (sudo setenforce 0) the issue goes away.

Now I just have to find sometime to figure out how to set a SELinux policy for this. Any suggestions to same me some googling?

Thank you

5

This could help you to generate a permissive SELinux policy that allows Apache or Nginx to read and write to the Redis unix socket.

1 Like
6

Sorry about taking so long to reply, I have been busy.

The following steps resolved the issue:

sudo setsebool -P daemons_enable_cluster_mode 1

sudo grep 'redis.sock' /var/log/audit/audit.log | audit2allow -M httpd-to-redis-socket

sudo semodule -i httpd-to-redis-socket.pp

Please note, you will have to get Nextcloud/redis to fail once so that there will be something in your audit.log. This seems to be a known issue in RHEL 8/CentOS 8 which will be address in future releases. In Fedora 34 you only need to complete the following steps to resolve this issue:

sudo setsebool -P daemons_enable_cluster_mode 1

Thank you