yum 安装时错误 Couldn't resolve host 解决办法
修改/etc/resolv.conf 添加：nameserver 8.8.8.8 ...
原文：Zabbix邮件告警提示Couldn't resolve host name解决办法
zabbix设置好邮件告警，当有触发时邮件未发送 查看zabbix server日志，提示不能连接邮件发送服务器，但是ping是可以通的 ...
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