Alain Raap

In our Moodle environment we don't have more than one application server. We store the cache, localcache and temp files on the application server and that is much faster, also for the temporary backup files that aren't saved over the network anymore. It works fine for us.

Yes, Redis works fine on a unix socket, this is the redis-cli output:

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

Maybe I say it wrong, with parameters server and socket I can't make a connection with Redis:

These are the messages I see in the Apache error_log:
PHP Warning: Redis::connect(): connect() failed: Connection refused in /var/www/moodle/cache/stores/redis/lib.php on line 159
PHP message: PHP Warning: Redis::connect(): connect() failed: Permission denied in /var/www/moodle/lib/classes/session/redis.php on line 171
PHP message: Failed to connect (try 1 out of 5) to redis at /var/run/redis/redis.sock:0

In config.php I changed this:

$CFG->session_redis_host = '/var/run/redis/redis.sock';
$CFG->session_redis_port = 0;

In redis.conf I changed this:

port 0
unixsocket /var/run/redis/redis.sock
unixsocketperm 660

In redis.log I see:

19666:M 07 Aug 14:22:19.504 * The server is now ready to accept connections at /var/run/redis/redis.sock

When I want to login in Moodle I see the error above.