ORACLE RAC需要建立用户等价

在安装Oracle Database的步骤“Specify Hardware Cluster Installation Mode”，“Select All”选中next会报如下错误“The user "oracle" does not have user equivalence setup on nodes "[rac1]." Please set up the user equivalence before proceeding.
PRKC-1030:Error checking accessibillty for node rac1,No RSA host key is known for rac1 and you have requested strict checking.Host key verification failed.”

因为没有创建用户等价，导致两台机器相互访问时需要输入密码，所以失败了；

解决方法：

配置SSH用户等价：

以oracle的用户在每一个节点上执行如下命令：

[oracle@rac1~]cd $home

[oracle@rac1~]mkdir .ssh

[oracle@rac1~]chmod 700 .ssh

[oracle@rac1~]cd .ssh

[oracle@rac1~]ssh-keygen -t rsa

[oracle@rac1~]ssh-keygen -t dsa

[oracle@rac1~]cat *.pub > authorized_keys

然后将2个节点的authorized_keys文件合成一个，再用这个文件覆盖没有节点.ssh下面的authorized_keys文件；

[oracle@rac2~]scp authorized_keys rac1:/home/oracle/.ssh/keys_dbs

[oracle@rac1~]cat keys_dbs >> authorized_keys

[oracle@rac1~]scp authorized_keys rac2:/home/oracle/.ssh/.

然后检查相互访问ssh是不需要密码的：

[oracle@rac1~]ssh rac2

[oracle@rac2]ssh rac1

然后再重新安装Oracle Database,这个问题就没有了。