linux ORA-12560: TNS:protocol adapter error

前些天，把linux的主机名改了，如从localhost改成rac面后发现客户端连接不到oracle,打开监听器配置如下

[root@rac admin]# cat listener.ora 
# listener.ora Network Configuration File: /u01/oracle/network/admin/listener.ora
# Generated by Oracle configuration tools.




SID_LIST_LISTENER =   
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = orcl)
      (ORACLE_HOME = /u01/oracle)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = orcl)
      (ORACLE_HOME = /u01/oracle)
      (SID_NAME = orcl)
    )
  )


LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    )
  )

注意此时肜的主机名是localhost，但实际改过后的主机名是rac,故此时客户端就连接不到oracle

修改如下：

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = rac)(PORT = 1521))
    )
  )

注意要先停止监听器，而后再改监听器配置文件，而后再启动监听器，否则会报

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=rac)(PORT=1521)))
TNS-12541: TNS:no listener
 TNS-12560: TNS:protocol adapter error
  TNS-00511: No listener
   Linux Error: 111: Connection refused

既不允许在监听器运行过程中，修改其监听器配置文件