/etc/default/redis-server is in redis-server 2:2.8.17-1+deb8u5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | # redis-server configure options
# ULIMIT: Call ulimit -n with this argument prior to invoking Redis itself.
# This may be required for high-concurrency environments. Redis itself cannot
# alter its limits as it is not being run as root. (default: do not call
# ulimit)
#
# ULIMIT=65536
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