cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.3 (Maipo)

systemctl start zabbix-agent
Job for zabbix-agent.service failed because a configured resource limit was exceeded. See "systemctl status zabbix-agent.service" and "journalctl -xe" for details.

systemctl status zabbix-agent.service
? zabbix-agent.service - Zabbix Agent
   Loaded: loaded (/usr/lib/systemd/system/zabbix-agent.service; enabled; vendor preset: disabled)
   Active: activating (auto-restart) (Result: resources) since Tue 2016-11-08 20:16:06 CET; 6s ago
  Process: 52646 ExecStop=/bin/kill -SIGTERM $MAINPID (code=exited, status=1/FAILURE)
  Process: 52654 ExecStart=/usr/sbin/zabbix_agentd -c $CONFFILE (code=exited, status=0/SUCCESS)
 Main PID: 52644 (code=exited, status=1/FAILURE)
Nov 08 20:16:06 hostname systemd[1]: Failed to start Zabbix Agent.
Nov 08 20:16:06 hostname systemd[1]: Unit zabbix-agent.service entered failed state.
Nov 08 20:16:06 hostname systemd[1]: zabbix-agent.service failed.

Nov  8 20:06:11 hostname systemd: zabbix-agent.service holdoff time over, scheduling restart.
Nov  8 20:06:11 hostname systemd: Starting Zabbix Agent...
Nov  8 20:06:11 hostname systemd: zabbix-agent.service: Supervising process 52333 which is not our child. We'll most likely not notice when it exits.
Nov  8 20:06:11 hostname systemd: Started Zabbix Agent.
Nov  8 20:06:11 hostname systemd: zabbix-agent.service: main process exited, code=exited, status=1/FAILURE
Nov  8 20:06:11 hostname kill: Usage:
Nov  8 20:06:11 hostname kill: kill [options] <pid|name> [...]
Nov  8 20:06:11 hostname systemd: zabbix-agent.service: control process exited, code=exited status=1
Nov  8 20:06:11 hostname kill: Options:
Nov  8 20:06:11 hostname kill: -a, --all              do not restrict the name-to-pid conversion to processes
Nov  8 20:06:11 hostname kill: with the same uid as the present process
Nov  8 20:06:11 hostname kill: -s, --signal <sig>     send specified signal
Nov  8 20:06:11 hostname kill: -q, --queue <sig>      use sigqueue(2) rather than kill(2)
Nov  8 20:06:11 hostname kill: -p, --pid              print pids without signaling them
Nov  8 20:06:11 hostname kill: -l, --list [=<signal>] list signal names, or convert one to a name
Nov  8 20:06:11 hostname kill: -L, --table            list signal names and numbers
Nov  8 20:06:11 hostname kill: -h, --help     display this help and exit
Nov  8 20:06:11 hostname kill: -V, --version  output version information and exit
Nov  8 20:06:11 hostname kill: For more details see kill(1).
Nov  8 20:06:11 hostname systemd: Unit zabbix-agent.service entered failed state.
Nov  8 20:06:11 hostname systemd: zabbix-agent.service failed.