如图：在DBCA进行到3%时，报错

因为/etc/hosts与/etc/sysconfig/network不对应，所以报错

[root@ocm2 ~]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1               localhost.localdomain localhost
::1             localhost6.localdomain6 localhost6


172.166.10.161  ocm1.localdomain ocm1
172.166.10.162  ocm2.localdomain ocm2
[root@ocm2 ~]# cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=ocm2.localdomain
[root@ocm2 ~]# hostname
ocm2.localdomain
[root@ocm2 ~]# 

之前在编辑/etc/sysconfig/network粗心将HOSTNAME=ocm2.localdomain写成HOSTNAME=com2.localdomain，故在DBCA时报以下图片错误。