在之前的文章中我介绍了为10g RAC Cluster添加节点的具体步骤。在11gr2中Oracle CRS升级为Grid Infrastructure，通过GI我们可以更方便地控制CRS资源如:VIP、ASM等等，这也导致了在为11.2中的GI添加节点时，同10gr2相比有着较大的差异。 这里我们要简述在11.2中为GI ADD NODE的几个要点： 一、准备工作 准备工作是不可忽略的，在10g RAC Cluster添加节点中我列举了必须完成的先决条件，在11.2 GI中这些条件依然有效，但请注意以下2点: 1.不仅要为oracle用户配置用户等价性，也要为grid(GI安装用户)用户配置；除非你同时使用oracle安装GI和RDBMS，这是不推荐的 2.在11.2 GI中推出了octssd(Oracle Cluster Synchronization Service Daemon)时间同步服务，如果打算使用octssd的话那么建议禁用ntpd事件服务,具体方法如下： 
# service ntpd stop
Shutting down ntpd:                                        [  OK  ]
# chkconfig ntpd off
# mv /etc/ntp.conf /etc/ntp.conf.orig
# rm /var/run/ntpd.pid
3.使用cluster verify工具验证新增节点是否满足cluster的要求: 
cluvfy stage -pre nodeadd -n <NEW NODE>

具体用法如:

su - grid

[grid@vrh1 ~]$ cluvfy stage -pre nodeadd -n vrh3

Performing pre-checks for node addition

Checking node reachability...
Node reachability check passed from node "vrh1"

Checking user equivalence...
User equivalence check passed for user "grid"

Checking node connectivity...

Checking hosts config file...

Verification of the hosts config file successful

Check: Node connectivity for interface "eth0"
Node connectivity passed for interface "eth0"

Node connectivity check passed

Checking CRS integrity...

CRS integrity check passed

Checking shared resources...

Checking CRS home location...
The location "/g01/11.2.0/grid" is not shared but is present/creatable on all nodes
Shared resources check for node addition passed

Checking node connectivity...

Checking hosts config file...

Verification of the hosts config file successful

Check: Node connectivity for interface "eth0"
Node connectivity passed for interface "eth0"

Check: Node connectivity for interface "eth1"
Node connectivity passed for interface "eth1"

Node connectivity check passed

Total memory check passed
Available memory check passed
Swap space check passed
Free disk space check passed for "vrh3:/tmp"
Free disk space check passed for "vrh1:/tmp"
Check for multiple users with UID value 54322 passed
User existence check passed for "grid"
Run level check passed
Hard limits check failed for "maximum open file descriptors"
Check failed on nodes:
        vrh3
Soft limits check passed for "maximum open file descriptors"
Hard limits check passed for "maximum user processes"
Soft limits check passed for "maximum user processes"
System architecture check passed
Kernel version check passed
Kernel parameter check passed for "semmsl"
Kernel parameter check passed for "semmns"
Kernel parameter check passed for "semopm"
Kernel parameter check passed for "semmni"
Kernel parameter check passed for "shmmax"
Kernel parameter check passed for "shmmni"
Kernel parameter check passed for "shmall"
Kernel parameter check passed for "file-max"
Kernel parameter check passed for "ip_local_port_range"
Kernel parameter check passed for "rmem_default"
Kernel parameter check passed for "rmem_max"
Kernel parameter check passed for "wmem_default"
Kernel parameter check passed for "wmem_max"
Kernel parameter check passed for "aio-max-nr"
Package existence check passed for "make-3.81( x86_64)"
Package existence check passed for "binutils-2.17.50.0.6( x86_64)"
Package existence check passed for "gcc-4.1.2 (x86_64)( x86_64)"
Package existence check passed for "libaio-0.3.106 (x86_64)( x86_64)"
Package existence check passed for "glibc-2.5-24 (x86_64)( x86_64)"
Package existence check passed for "compat-libstdc++-33-3.2.3 (x86_64)( x86_64)"
Package existence check passed for "elfutils-libelf-0.125 (x86_64)( x86_64)"
Package existence check passed for "elfutils-libelf-devel-0.125( x86_64)"
Package existence check passed for "glibc-common-2.5( x86_64)"
Package existence check passed for "glibc-devel-2.5 (x86_64)( x86_64)"
Package existence check passed for "glibc-headers-2.5( x86_64)"
Package existence check passed for "gcc-c++-4.1.2 (x86_64)( x86_64)"
Package existence check passed for "libaio-devel-0.3.106 (x86_64)( x86_64)"
Package existence check passed for "libgcc-4.1.2 (x86_64)( x86_64)"
Package existence check passed for "libstdc++-4.1.2 (x86_64)( x86_64)"
Package existence check passed for "libstdc++-devel-4.1.2 (x86_64)( x86_64)"
Package existence check passed for "sysstat-7.0.2( x86_64)"
Package existence check passed for "ksh-20060214( x86_64)"
Check for multiple users with UID value 0 passed
Current group ID check passed

Checking OCR integrity...

OCR integrity check passed

Checking Oracle Cluster Voting Disk configuration...

Oracle Cluster Voting Disk configuration check passed
Time zone consistency check passed

Starting Clock synchronization checks using Network Time Protocol(NTP)...

NTP Configuration file check started...
No NTP Daemons or Services were found to be running

Clock synchronization check using Network Time Protocol(NTP) passed

User "grid" is not part of "root" group. Check passed
Checking consistency of file "/etc/resolv.conf" across nodes

File "/etc/resolv.conf" does not have both domain and search entries defined
domain entry in file "/etc/resolv.conf" is consistent across nodes
search entry in file "/etc/resolv.conf" is consistent across nodes
All nodes have one search entry defined in file "/etc/resolv.conf"
PRVF-5636 : The DNS response time for an unreachable node exceeded "15000" ms on following nodes: vrh3

File "/etc/resolv.conf" is not consistent across nodes

Pre-check for node addition was unsuccessful on all the nodes.
一般来说如果我们不使用DNS解析域名方式的话，那么resolv.conf不一直的问题可以忽略，但在slient安装模式下可能造成我们的操作无法完成，这个后面会介绍。 二、向GI中加入新的节点 注意11.2.0.2 GI添加节点的关键脚本addNode.sh可能存在Bug，如官方文档所述当希望使用Interactive Mode交互模式启动OUI界面添加节点时，只要运行addNode.sh脚本即可，实际情况则不是这样: 
documentation said:
Go to CRS_home/oui/bin and run the addNode.sh script on one of the existing nodes.
Oracle Universal Installer runs in add node mode and the Welcome page displays.
Click Next and the Specify Cluster Nodes for Node Addition page displays.

we done:

运行addNode.sh要求以GI拥有者身份运行该脚本，一般为grid用户，要求在已有的正运行GI的节点上启动脚本

[grid@vrh1 ~]$ cd $ORA_CRS_HOME/oui/bin

[grid@vrh1 bin]$ ./addNode.sh
ERROR:
Value for CLUSTER_NEW_NODES not specified.

USAGE:
/g01/11.2.0/grid/cv/cvutl/check_nodeadd.pl  {-pre|-post}

/g01/11.2.0/grid/cv/cvutl/check_nodeadd.pl -pre [-silent] CLUSTER_NEW_NODES={}
/g01/11.2.0/grid/cv/cvutl/check_nodeadd.pl -pre [-silent] CLUSTER_NEW_NODES={}