redis服务启动失败

# /bin/systemctl start  redisd.service
Failed to start redisd.service: Unit not found.
# ps -ef | grep redis
redis     1015     1  0 Nov26 ?        00:01:10 /usr/local/redis/bin/redis-server 127.0.0.1:6379
root      6552  2259  0 15:53 pts/0    00:00:00 grep --color redis
# redis-cli
127.0.0.1:6379> ping
PONG
127.0.0.1:6379> 
看服务是已经安装了吧。