Memo
Can't open PID file /run/redis/redis-server.pid (yet?) after start:
Ajouter dans /etc/systemd/system/redis.service
ExecStartPost=/bin/sh -c "echo $MAINPID > /var/run/redis/redis.pid"
Ajouter dans /etc/systemd/system/redis.service
ExecStartPost=/bin/sh -c "echo $MAINPID > /var/run/redis/redis.pid"