yum install hddtemp
apt install hddtemp
# start service at 7634
systemctl enable hddtemp
systemctl start hddtemp

#config file
vi /etc/default/hddtemp
#1. uncomment DISKS and set vaule /dev/sd[bcd]
#2. set RUN_DAEMON="true"

yum install netcat
apt install netcat

# test
nc localhost 7634