无法连接Linux 实例?

首先,请确保您的云服务器上已绑定公网IP并且是开机状态。您可通过VNC连接到Linux实例。请参阅使用Linux服务器

无法连接Linux实例的排查思路:

1、 主机内网IP获取是否正常? 以及您当地所在运营商对我们业务网关的连通性。

故障现象:无法远程主机
解决方法:通过VNC连接主机,在主机内部查看网卡的信息是否获取到内网IP。
步骤:查看云服务器控制台-内网IP,例如是内网IP是【192.168.0.171】

在云服务器列表的“更多操作”中,点击【连接】按钮,通过VNC连接到Linux云服务器。

输入帐户名“root”和操作系统密码登录。

输入 ifconfig 命令行,查看云服务器网卡的信息看是否获取到内网IP。如果出现内网IP【192.168.0.171】,则获取内网IP正常。

在主机内ping 一下 www.google.com 测试一下网络连通性。
执行 ping www.google.com 命令。出现如下图所示,则说明主机访问外网是通的。

如果主机访问外网不通的,则在主机内ping 一下节点(如美国)的内网网关及外网网关。每个地区的云服务器网关会存在差异,可咨询客服或者提工单获取对应云服务器的网关信息。

本地电脑也可ping 一下节点(如美国)的内网网关及外网网关,验证您当地所在运营商对我们业务网关的连通性。

2、 防火墙配置是否正确?

查看防火墙配置规则是否正确,例如您想访问80端口,本来是要配置入站规则,但配置成了出站规则,则访问80端口不通。如果防火墙配置正确,仍然访问端口不通,则请提交工单或者联系客服

3、 安全组公网规则

故障现象:无法连接到云服务器,排查防火墙,内网IP配置无误后,仍然无法连接到云服务器。
可能原因:云服务器安全组默认的公网规则被删除,或者是云服务器中没有此端口服务。
解决方案:重新配置云服务器的安全组公网规则,添加入站ICMP协议和开放22端口和3389端口。如果是要查看云服务器中有哪些端口服务,则执行netstat –ant 命令行,查看端口情况。

查看云服务器是否有端口服务

4、 远程端口访问异常

可能原因:1、 主机状态为关机状态 2、 修改了远程端口 3、IP被运营商封停。

5、 CPU负载过高

故障现象:云服务器CPU 负载过高导致系统无法进行远程连接。
解决办法:运行 top 命令,查看程序运行的负载情况。若应用程序有大量的磁盘访问/网络访问行为/高计算需求,高 CPU 是正常结果。您可以尝试升配实例规格来解决资源瓶颈问题。

运行top命令,查看程序运行的负载情况

最后尝试重启实例
重启操作会使实例停止工作,从而中断业务,请谨慎执行。
注意:重启实例前,需对实例创建快照,用于数据备份或者系统回滚
在控制台重启实例。重启实例后,请再次尝试实例连接。

通过上述排查后,若 ECS 实例仍不能连接,请您记录前述各步骤的排查结果、相关日志信息或截图及主机密码,然后联系技术支持

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