First turn off the firewall and disable selinux:
systemctl disable firewalld
vi /etc/selinux/config

Install the Zabbix 3.4 source repo and install zabbix and lm_sensros and smartmontools:
rpm -ivh https://repo.zabbix.com/zabbix/3.4/rhel/7/x86_64/zabbix-release-3.4-2.el7.noarch.rpm
yum install -y zabbix-agent lm_sensors smartmontools

Edit /etc/zabbix/zabbix_agentd.conf and set the Server and ServerActive to the hostname of your zabbix server.

Create a sudoers.d file for zabbix in /etc/sudoers.d/zabbix:
zabbix ALL=NOPASSWD:/usr/sbin/smartctl
zabbix ALL=NOPASSWD:/bin/sensors

Create a new files in /etc/zabbix/zabbix_agentd.d called hdd_temps.conf and enter information like so:
UserParameter=Temperature.HDD2,/usr/share/zabbix-agent/hdd2.sh
UserParameter=Temperature.HDD1,/usr/share/zabbix-agent/hdd1.sh
UserParameter=Temperature.CPU1,/usr/share/zabbix-agent/cpu1.sh

Create the /usr/share/zabbix-agent directory and add hdd1, hdd2 and cpu1 shell scripts:
#!/bin/bash
sudo smartctl -a /dev/sdb | grep Temperature_Celsius | awk {'print $10'}
#!/bin/bash
sudo smartctl -a /dev/sdc | grep Temperature_Celsius | awk {'print $10'}
#!/bin/bash
sudo sensors | grep Core | awk -F'[+|.]' {'print $2'}

In zabbix you need to add the items for HDD1, HDD2 and CPU1 to the configuration of the host. Once it is added zabbix will collect the date periodically.

UPDATE pg_database SET datallowconn = TRUE WHERE datname = 'template0';
UPDATE pg_database SET datistemplate = FALSE WHERE datname = 'template1';
drop database template1;
CREATE DATABASE template1 ENCODING = 'utf8' TEMPLATE = template0 LC_CTYPE ='en_US.utf8' LC_COLLATE = 'en_US.utf8';
UPDATE pg_database SET datistemplate = TRUE WHERE datname = 'template1';
UPDATE pg_database SET datallowconn = FALSE WHERE datname = 'template0';

This post details setting up mediasmartserverd under Centos 7 on an HP EX490. This allows for the status LED to be used as an indicator for updates and also the drive lights to be illuminated according to disk state/activity. The mediasmartserverd binary is built on the local machine:
yum -y install wget zip libudev-devel
yum -y groupinstall "Development Tools"
wget https://github.com/merelin/mediasmartserverd/archive/0.5.6.tar.gz
tar -zxvf 0.5.6.tar.gz
cd mediasmartserverd-0.5.6
make
cp mediasmartserverd /usr/local/sbin/
vi /usr/lib/systemd/system/mediasmartserverd.service

The enter the following into the file and exit with [Esc]:wq:

[Unit]
Description=MediaSmartServer

[Service]
ExecStart=/usr/local/sbin/mediasmartserverd --activity --update-monitor
Restart=always

[Install]
WantedBy=multi-user.target


Then enable and start the service:
systemctl enable mediasmartserverd.service
systemctl start mediasmartserverd.service