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With the new transactional file locking in place, we felt it was time to get rid of APCu and replace our cache with Redis instead. APCu is kind of old, and from our understanding, it doesn’t work well with the new Laravel locking system. Redis cache is the preferred way to go. Update APT and Install Development Tools First:   # apt update && apt upgrade # sudo apt install build-essential -y # apt-get install autoconf automake gdb git libffi-dev zlib1g-dev libssl-dev Install and Enable Redis Server # sudo apt install redis-server # sudo systemctl enable redis-server Change Redis configuration in file /etc/redis/redis.conf # vi /etc/redis/redis.conf bind 127.0.0.1 ::1 maxmemory 500mb maxmemory-policy volatile-lru port 6379 and after change the system configuration: (for redis use) # echo 1 > /proc/sys/vm/overcommit_memory add at file /etc/sysctl.conf (for redis use) vm.overcommit_memory = 1 [at end of the line] and update the system configuration: # sysctl -p Restart Red