zabbix错误提示解决
Received empty response from Zabbix Agent at . 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
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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
# vim /etc/zabbix/zabbix_server.conf
修改为
StartDiscoverers=5
重启
# systemctl restart zabbix-server
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zabbix-agent无法启动错误
# tail -20 /var/log/zabbix/zabbix_agentd.log
.........................
zabbix_agentd : cannot create PID file : No such file or directory
zabbix_agentd : cannot create PID file : No such file or directory
zabbix_agentd : cannot create PID file : Permission denied
解决
# mkdir -p /var/run/zabbix/
# chown zabbix.zabbix /var/run/zabbix/
# systemctl restart zabbix-agent.service
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