环境说明：
OS:Centos Linux 7.5
DB:Oracle 11.2.0.4.0
已有节点:RAC1、RAC2
新加节点:RAC3
一：环境准备
二：添加GI
三：添加Oracle软件
四：添加Oracle实例
五：检查
一：环境准备
RAC3服务器：
创建操作系统、配置host、创建目录并授权、创建用户和用户组、设置用户环境变量、配置yum安装所需包、
配置内核参数、 设置SHELL限制、设置ssh互信、设置共享存储、关闭防火墙、关闭seliunx;
二：添加GI
---在rac1节点执行
[grid@rac1 bin]$ cluvfy stage -pre nodeadd -n rac3 -fixup >0808.log
[grid@rac1 ~]$ export IGNORE_PREADDNODE_CHECKS=Y
[grid@rac1 ~]$ cd $ORACLE_HOME/oui/bin
[grid@rac1 ~]$ ./addNode.sh "CLUSTER_NEW_NODES={rac3}" "CLUSTER_NEW_VIRTUAL_HOSTNAMES={rac3-vip}"
---在rac3节点执行脚本
[root@rac3 ~]# /u01/app/oraInventory/orainstRoot.sh
[root@rac3 ~]# /u01/app/11.2.0/grid/root.sh
---查看状态
[root@rac1 ~]# cd /u01/app/11.2.0/grid/bin
[grid@rac1 bin]$ crs_stat -t
[grid@rac1 bin]$ crsctl stat res -t
三：添加Oracle软件
---在rac1节点执行
[oracle@rac1 .ssh]$ $ORACLE_HOME/oui/bin/addNode.sh "CLUSTER_NEW_NODES={rac3}"
---根据提示，需要在rac3上执行root.sh
[root@rac3 ~]# /u01/app/oracle/product/11.2.0/db_1/root.sh
---执行有如下两个报错(本次实验忽略该错误，不做处理)
/bin/chown:cannot access '/u01/app/oracle/product/11.2.0/db_1/bin/nmhs':No such file or directory
/bin/chmod:cannot access '/u01/app/oracle/product/11.2.0/db_1/bin/nmhs':No such file or directory
---尝试手动从rac1节点将nmhs文件拷贝到rac3，也会失败，提示权限不足
[oracle@rac1 ~]$ scp /u01/app/oracle/product/11.2.0.db_1/bin/nmhs
rac3:/u01/app/oracle/product/11.2.0.db_1/bin/
/u01/app/oracle/product/11.2.0.db_1/bin/nmhs: Permission denied
---查看nmhs权限
[root@rac1 ~]$ ls -rth /u01/app/oracle/product/11.2.0.db_1/bin/nmh*
-r2xr-xr-x oracle oinstall /u01/app/oracle/product/11.2.0.db_1/bin/nmh0
-rws--x--- root oinstall /u01/app/oracle/product/11.2.0.db_1/bin/nmhs
---rac3节点可以使用sqlplus工具了
[oracle@rac3 ~]# sqlplus / as sysdba
四：添加Oracle实例
---DBCA
[oracle@rac1 ~]$ dbca
Instance Management
Add an instance
五：检查
[grid@rac1 ~]# srvctl status database -d racdb
Instance racdb1 is running on node rac1
Instance racdb1 is running on node rac2
Instance racdb1 is running on node rac3
[oracle@rac1 ~]# sqlplus / as sys dba
SQL> select instance_name,instance_number from v$instance ;
INSTANCE_NAME INSTANCE_NUMBER
------------- ---------------
racdb3 3
racdb2 2
racdb1 1
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