服务器宕机是指服务器因为某些原因而导致服务器无法运转，造成网络无法正常使用。对于网站来说，服务器宕机所造成影响很大，它不但造成访客无妨对网站进行访问，甚至还可能影响到网站在搜索引擎上的收录和排名，因而在租用服务器时，建议站长选择想美国服务器这种出现宕机概率比较低的服务器。在服务器使用的过程中，服务器宕机可能都出现，首先我们要找到服务器可能出现宕机的原因吗，才能找到对应的解决办法。
服务器宕机可以分为两种：假死机和死机
假死机(非蓝屏死机)是由于硬件资源暂时性地被消耗殆尽，因而无法对外部指令进行响应的现象，通常是网站处于访问高峰期，带宽等资源跑满，这时只需要等待一定的时间，待服务器腾出更多的硬件资源即可恢复正常，
而死机，如果通过ping测试服务器，键盘切换数字锁定键(NumLock)或大写锁定键(Caps Lock)功能，显示器无画面输出，或者鼠标光标没有任何反应则表明服务器硬件故障。
如何查看服务器宕机的原因
1.是否是应用程序导致内存溢出或者泄露，out of memory导致
2.是否是进程过多或者不断创建，耗尽资源导致
3.是否是数据库程序死锁，连接数过多导致
4.是否是应用程序异常导致
5.是否是流量负载过大导致
6.是否是遭受黑客入侵攻击导致
7.是否是误操作导致
如果服务器宕机了，首先需要尽快通知相关技术人员进行处理，排查问题所在，并尽快恢复服务。在等待技术人员到达前，可以先进行以下简单的故障排查：
1. 检查网络连接情况，确保网络正常；
2. 检查服务端口是否正常工作；
3. 检查服务运行日志，查看错误日志；
4. 检查服务设置，调整相应的参数和配置文件。
如果以上的方法都无法解决问题，建议在技术人员到来之前及时备份数据，并及时联系相关供应商或服务提供商获取帮助。
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