Received empty response from Zabbix Agent at [127.0.0.1]. Assuming that agent dropped connection because of access permissions.

意思是说没有权限访问agent端口10050，解决方法如下：

将server的agent链接IP 127.0.0.1修改为本机IP

重启服务

# systemctl restart zabbix-server


======================================

Zabbix discoverer processes more than 75% busy


增加Zabbix Server启动时初始化的进程数量，这样直接增加了轮询的负载量，从比例上来讲忙的情况就少了

[root@zabbix-server ~]# vim /etc/zabbix/zabbix_server.conf

修改为

StartDiscoverers=5

重启

[root@zabbix-server ~]# systemctl restart zabbix-server

======================================

zabbix-agent无法启动错误

# tail -20 /var/log/zabbix/zabbix_agentd.log

.........................

zabbix_agentd [1232]: cannot create PID file [/var/run/zabbix/zabbix_agentd.pid]: [2] No such file or directory

zabbix_agentd [3847]: cannot create PID file [/var/run/zabbix/zabbix_agentd.pid]: [2] No such file or directory

zabbix_agentd [1724]: cannot create PID file [/var/run/zabbix/zabbix_agentd.pid]: [13] Permission denied


解决

[root@elkstack ~]# mkdir -p /var/run/zabbix/

[root@elkstack ~]# chown zabbix.zabbix /var/run/zabbix/

[root@elkstack ~]# systemctl restart zabbix-agent.service