1、修改HOSTS文件，添加node2到本机IP地址的映射：
[root@node2home]# gedit /etc/hosts
最后一行为添加的：
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.222.11 node2
2、修改/etc/sysconfig/network添加如下：
[root@node2 home]# gedit /etc/sysconfig/network NETWORKING=yes HOSTNAME=node2
3、修改listener.ora
su oracle
gedit /home/oracle/product/11.2/db_1/network/admin/listener.ora
修改HOST由HOST=localhost改为HOST=node2（随意）：
# listener.ora Network Configuration File: /home/oracle/product/11.2/db_1/network/admin/listener.ora # Generated by Oracle configuration tools. LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = node2)(PORT = 1521)) ) ) ADR_BASE_LISTENER = /home/oracle
4、tnsnames.ora文件不修改也可，我没修改
gedit /home/oracle/product/11.2/db_1/network/admin/tnsnames.ora
# tnsnames.ora Network Configuration File: /home/oracle/product/11.2/db_1/network/admin/tnsnames.ora # Generated by Oracle configuration tools. ORCL = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl) ) )