在配置RAC节点之间相互信任机制的时候，rac2节点上grid用户忘记给 ~/.ssh授权，导致rac2节点无法通过验证，错误如下：
1 [grid@rac2 grid]$ ./runcluvfy.sh stage -pre crsinst -n rac1,rac2 -fixup -verbose 2 3 Performing pre-checks for cluster services setup 4 5 Checking node reachability... 6 7 Check: Node reachability from node "rac2" 8 Destination Node Reachable? 9 ------------------------------------ ------------------------10 rac2 yes 11 rac1 yes 12 Result: Node reachability check passed from node "rac2"13 14 15 Checking user equivalence...16 17 Check: User equivalence for user "grid"18 Node Name Comment 19 ------------------------------------ ------------------------20 rac2 failed 21 rac1 failed 22 Result: PRVF-4007 : User equivalence check failed for user "grid"23 24 ERROR: 25 User equivalence unavailable on all the specified nodes26 Verification cannot proceed27 28 29 Pre-check for cluster services setup was unsuccessful on all the nodes
上面的错误就是先创建了ssh验证，然后在授权导致，一定要先授权然后在创建ssh验证，代码如下：
1 [grid@rac2 .ssh]$ chmod 700 ~/.ssh/ 2 [grid@rac2 .ssh]$ /usr/bin/ssh-key -t rsa 3 ssh-keygen ssh-keyscan 4 [grid@rac2 .ssh]$ /usr/bin/ssh-keygen -t rsa 5 Generating public/private rsa key pair. 6 Enter file in which to save the key (/home/grid/.ssh/id_rsa): 7 /home/grid/.ssh/id_rsa already exists. 8 Overwrite (y/n)? yes 9 Enter passphrase (empty for no passphrase): 10 Enter same passphrase again: 11 Your identification has been saved in /home/grid/.ssh/id_rsa.12 Your public key has been saved in /home/grid/.ssh/id_rsa.pub.13 The key fingerprint is:14 3d:50:b7:09:58:c6:84:8e:52:46:a6:ca:bc:6b:da:12 grid@rac215 The key's randomart image is:16 +--[ RSA 2048]----+17 | .o ** . |18 | oo oo.o o |19 | .o o. o |20 | o .. . .o |21 | + . S o |22 |E . . |23 | .. |24 |.... |25 |.+o |26 +-----------------+27 [grid@rac2 .ssh]$ cat id_rsa.pub >>authorized_keys 28 [grid@rac2 .ssh]$ ls29 authorized_keys id_rsa id_rsa.pub known_hosts30 [grid@rac2 .ssh]$ ll31 total 1632 -rw-r--r--. 1 grid oinstall 782 Aug 17 13:38 authorized_keys33 -rw-------. 1 grid oinstall 1675 Aug 17 13:37 id_rsa34 -rw-r--r--. 1 grid oinstall 391 Aug 17 13:37 id_rsa.pub35 -rw-r--r--. 1 grid oinstall 1590 Aug 17 12:49 known_hosts36 [grid@rac2 .ssh]$ scp authorized_keys rac1:/home/grid/.ssh/37 grid@rac1's password: 38 authorized_keys 100% 782 0.8KB/s 00:00 39 [grid@rac2 .ssh]$ ssh rac1 date40 Fri Aug 17 13:39:09 CST 201841 [grid@rac2 .ssh]$ ssh rac1priv date42 Fri Aug 17 13:39:18 CST 201843 [grid@rac2 .ssh]$ ssh rac2 date44 Fri Aug 17 13:39:28 CST 201845 [grid@rac2 .ssh]$ ssh rac2priv date46 Fri Aug 17 13:39:33 CST 2018