问题1. Zabbix网络发现system.uanem找不到主机，打开zabbix_server.conf文件的debug
DebugLevel=5
# 错误信息如下
# item [system.uname] error: A TLS connection is configured to be used with agent but support for TLS was not compiled into server
解决方法：
# yum install -y openssl openssl-devel
# 增加编译参数 --with-openssl