# cat /proc/$(pgrep -o zabbix_server)/limits | grep "Max open files"
Max open files 1024 524288 files
# mkdir /etc/systemd/system/zabbix-server.service.d
# chmod 755 /etc/systemd/system/zabbix-server.service.d
# nano /etc/systemd/system/zabbix-server.service.d/override.conf
[Service]
LimitAS=infinity
LimitRSS=infinity
LimitNOFILE=10000
LimitNOPROC=1024
# systemctl daemon-reload
# systemctl status zabbix-server.service
# systemctl restart zabbix-server.service
# cat /proc/$(pgrep -o zabbix_server)/limits | grep "Max open files"
Max open files 10000 10000 files