Description of problem:
When using sockets in redis instead of tcp, redis won't start because /var/run/redis directory is missing.

Version-Release number of selected component (if applicable):
redis-3.2.7-1.fc25.x86_64

How reproducible:
enable unixsocket /var/run/redis/redis.sock in /etc/redis.conf

Steps to Reproduce:
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Actual results:
redis refuses to start

Expected results:
redis starting and using socket

Additional info:
Fix in systemd service unit file by adding RuntimeDirectory=redis in [Service] section.