zabbix通过yum安装，启动报错zabbix-agent.service never wrote its PID file. Failing.

在cenots7安装zabbix，选择好需要的版本，根据手册执行：
zabbix官网安装说明

查看状态：

[root@localhost ~]# systemctl status zabbix-agent
● zabbix-agent.service - Zabbix Agent
   Loaded: loaded (/usr/lib/systemd/system/zabbix-agent.service; disabled; vendor preset: disabled)
   Active: activating (auto-restart) (Result: resources) since 六 2021-05-08 10:20:40 CST; 6s ago
  Process: 35969 ExecStart=/usr/sbin/zabbix_agentd -c $CONFFILE (code=exited, status=0/SUCCESS)

5月 08 10:20:40 localhost.localdomain systemd[1]: zabbix-agent.service never wrote its PID file. Failing.
5月 08 10:20:40 localhost.localdomain systemd[1]: Failed to start Zabbix Agent.
5月 08 10:20:40 localhost.localdomain systemd[1]: Unit zabbix-agent.service entered failed state.
5月 08 10:20:40 localhost.localdomain systemd[1]: zabbix-agent.service failed.
Hint: Some lines were ellipsized, use -l to show in full.

解决办法，执行以下命令：

[root@localhost ~]# getenforce 
Enforcing
[root@localhost ~]# setenforce 0
[root@localhost ~]# getenforce 
Permissive

执行完毕后，再次查看状态：

[root@localhost ~]# systemctl status zabbix-agent
● zabbix-agent.service - Zabbix Agent
   Loaded: loaded (/usr/lib/systemd/system/zabbix-agent.service; disabled; vendor preset: disabled)
   Active: active (running) since 六 2021-05-08 10:23:14 CST; 7s ago
  Process: 38354 ExecStart=/usr/sbin/zabbix_agentd -c $CONFFILE (code=exited, status=0/SUCCESS)
 Main PID: 38356 (zabbix_agentd)
   CGroup: /system.slice/zabbix-agent.service
           ├─38356 /usr/sbin/zabbix_agentd -c /etc/zabbix/zabbix_agentd.conf