DG切换完后节点起不来，手动起报错误ORA-00119和ORA-00132

前天割完一套rac下得DG，两节点的数据库都没起来，手动startup结果如下：

[oracle@mssdb1 ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.4.0 Production on Sat Aug 11 00:57:39 2018
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup nomount
ORA-00119: invalid specification for system parameter REMOTE_LISTENER
ORA-00132: syntax error or unresolved network name ‘mssdb-scan:1821’
SQL>

检查了CRS资源，rac节点资源，都没问题，最后发现是识别不了hosts文件，原来配置节点信息的时候直接用的是IP，而不是别名，查看hosts文件的权限，更改权限后解决。

[root@mssdb2 ~]# ls -l /etc/hosts
-rw-r—– 1 root root 675 Aug 10 16:47 /etc/hosts
[root@mssdb2 ~]# chmod 644 /etc/hosts