Install Zabbix Proxy on Raspbian Stretch

# make sure this is stretch
grep PRETTY_NAME /etc/os-release

# update system
apt-get update -y && apt-get dist-upgrade -y

# set only 16MB for the GPU
echo "gpu_mem=16" >> /boot/config.txt

# disable wifi to save power 
echo "dtoverlay=pi3-disable-wifi" >> /boot/config.txt

# update firmware
rpi-update

# download and install zabbix repo
cd
wget https://repo.zabbix.com/zabbix/4.0/raspbian/pool/main/z/zabbix-release/zabbix-release_4.0-2+stretch_all.deb
dpkg -i zabbix-release_4.0-2+stretch_all.deb

# update system
apt update

# install all components + some conveniences
apt install zabbix-agent zabbix-proxy-sqlite3 zabbix-get zabbix-sender snmp-mibs-downloader snmp vim tidy jq git libxml2-utils

# make sure all services are not running
systemctl stop {zabbix-proxy,zabbix-agent}

# put proxy conf inside variable
proxy=/etc/zabbix/zabbix_proxy.conf

sed -i "s|^Server=.*$|Server=ec2-35-166-97-138.us-west-2.compute.amazonaws.com|" $proxy


sed -i '/^Hostname=.*$/d' $proxy


sed -i "s|^.*HostnameItem=.*$|HostnameItem=system.run\[ifconfig eth0\|egrep -o \"..:..:.. \"\|sed \"s\|:\|\|g;s\|.\$\|\|;s\|^\|RPiProxY\|\"\]|" $proxy


sed -i "s|^DBName=.*$|DBName=\/dev\/shm\/zabbix_proxy.db.sqlite3|" $proxy


sed -i "s|^PidFile=.*$|PidFile=\/dev\/shm\/zabbix_proxy.pid|" $proxy

sed -i "s|^LogFile=.*$|LogFile=\/dev\/shm\/zabbix_proxy.log|" $proxy


sed -i "s|^.*EnableRemoteCommands=.*$|EnableRemoteCommands=1|" $proxy

sed -i "s|^Timeout=.*$|Timeout=30|" $proxy

sed -i "s|^.*ConfigFrequency=.*$|ConfigFrequency=300|" $proxy

grep -v "^#\|^$" $proxy

# put agent conf inside variable
agent=/etc/zabbix/zabbix_agentd.conf

grep -v "^$\|^#" $agent

Set the log file for agent:

sed -i "s|^LogFile=.*$|LogFile=\/dev\/shm\/zabbix_agentd.log|" $agent

Set the pid file for agent:
sed -i "s|^PidFile=.*$|PidFile=\/dev\/shm\/zabbix_agentd.pid|" $agent


Remove the static hostname:
sed -i '/^Hostname=.*$/d' $agent

Set dynamic hostname:
sed -i "s|^.*HostnameItem=.*$|HostnameItem=system.run\[ifconfig eth0\|egrep -o \"..:..:.. \"\|sed \"s\|:\|\|g;s\|.\$\|\|;s\|^\|RPiProxY\|\"\]|" $agent

Enable remote commands:
sed -i "s|^.*EnableRemoteCommands=.*$|EnableRemoteCommands=1|" $agent

Allow zabbix agent to execute sensitive commmands like 'vcgencmd measure_temp':
usermod -a -G video zabbix

Observe again the latest configuration:
grep -v "^$\|^#" $agent

Start the agent:
systemctl start zabbix-agent

Check if the pid file and the log file have been created:
ls -l /dev/shm

Check the agent log file:
cat /dev/shm/zabbix_agentd.log