I'm trying to run zabbix-agent 3.0.4 on CentOS7, systemd failed to start the zabbix agent, from `journalctl -xe`
```
PID file /run/zabbix/zabbix_agentd.pid not readable (yes?) after start.
node=localhost.localdomain type=SERVICE_START msg=audit(1475848200.601:17994): pid=1 uid=0 auid=4294967298 ses=...
zabbix-agent.service never wrote its PID file. Failing.
Failed to start Zabbix Agent.
```
There is no permission error, and I try to re-configure the PID path to /tmp folder in zabbix-agent.service and zabbix_agentd.conf, it doesn't work.
Very weird, anyone has idea? Thank you in advance.