openstack系列之运维排障：虚拟机SSH连接失败

虚拟机报错，报错信息如下：

[root@node1 ceph]# ssh root@192.168.1.69
The authenticity of host '192.168.1.69 (192.168.1.69)' can't be established.
ECDSA key fingerprint is SHA256:ADp2EBTMaNzrI62z/J7UH6aEbTXatFFmdl2gzQAkRmI.
ECDSA key fingerprint is MD5:f6:fd:b8:20:1c:9a:ca:68:79:dc:33:90:88:c6:9d:6a.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.1.69' (ECDSA) to the list of known hosts.
root@192.168.1.69's password:
Unable to get valid context for root
Last login: Thu Aug 2 14:06:15 2018 from 192.168.100.41
Connection to 192.168.1.69 closed.

原因如下

修改了/etc/selinux中的selinuxtype参数。

解决方案如下：

重启机器

在启动界面按e进入编辑模式

在最后添加selinux=0

ctrl+x保存

进入系统，修改/etc/selinux selinuxtype=targeted。