RAC安装时需要执行4个脚本
1） $ORACLE_BASE/oraInventory/orainstRoot.sh （clusterware 结束时执行）
2） $CRS_HOME/root.sh （clusterware 结束时执行）
3） $CRS_HOME/bin/vipca.sh（该脚本是在第二个节点执行$CRS_HOME/root.sh时被自动调用）
4） $ORACLE_HOME/root.sh （安装完数据库以后执行）
1. orainstRoot.sh 脚本
1.1 orainstRoot.sh 脚本执行过程
root@node2 #/oracle/oraInventory/orainstRoot.sh
Changing permissions of /oracle/oraInventory to 770.
Changing groupname of /oracle/oraInventory to oinstall.
The execution of the script is complete
1.2 orainstRoot.sh 脚本内容
root@node1 # more /oracle/oraInventory/orainstRoot.sh
#!/bin/sh
if [ ! -d "/var/opt/oracle" ]; then
mkdir -p /var/opt/oracle;
fi
if [ -d "/var/opt/oracle" ]; then
chmod 755 /var/opt/oracle;
fi
if [ -f "/oracle/oraInventory/oraInst.loc" ]; then
cp /oracle/oraInventory/oraInst.loc /var/opt/oracle/oraInst.loc;
chmod 644 /var/opt/oracle/oraInst.loc;
else
INVPTR=/var/opt/oracle/oraInst.loc
INVLOC=/oracle/oraInventory
GRP=oinstall
PTRDIR="`dirname $INVPTR`";
# Create the software inventory location pointer file
if [ ! -d "$PTRDIR" ]; then
mkdir -p $PTRDIR;
fi
echo "Creating the Oracle inventory pointer file （$INVPTR）";
echo inventory_loc=$INVLOC > $INVPTR
echo inst_group=$GRP 》 $INVPTR
chmod 644 $INVPTR
# Create the inventory directory if it doesn't exist
if [ ! -d "$INVLOC" ];then
echo "Creating the Oracle inventory directory （$INVLOC）";
mkdir -p $INVLOC;
fi
fi
echo "Changing permissions of /oracle/oraInventory to 770.";
chmod -R 770 /oracle/oraInventory;
if [ $ != 0 ]; then
echo "OUI-35086:WARNING: chmod of /oracle/oraInventory to 770 failed!";
fi
echo "Changing groupname of /oracle/oraInventory to oinstall.";
chgrp oinstall /oracle/oraInventory;
if [ $ != 0 ]; then
echo "OUI-10057:WARNING: chgrp of /oracle/oraInventory to oinstall failed!";
fi
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echo "The execution of the script is complete"
从脚本我们可以看出，这个脚本主要是创建/var/opt/oracle目录（如果不存在的话），再在该目录下建oraInst.loc文件（该文件记录orainventory的位置和组）。并改变orainventory的属性。
root@node2 # ls –rlt /var/opt/oracle/
total 2
-rw-r--r-- 1 root root 55 Apr 2 14:42 oraInst.loc
root@node2 # more oraInst.loc
inventory_loc=/oracle/oraInventory
inst_group=oinstall
在另一个节点上运行该脚本
root@node1 #/oracle/oraInventory/orainstRoot.sh
Changing permissions of /oracle/oraInventory to 770.
Changing groupname of /oracle/oraInventory to oinstall.
The execution of the script is complete
2. Root.sh 脚本
2.1 root.sh 脚本执行过程
root@node2 #/oracle/crs/root.sh
WARNING: directory '/oracle' is not owned by root
Checking to see if Oracle CRS stack is already configured
Checking to see if any 9i GSD is up
Setting the permissions on OCR backup directory
Setting up NS directories
Oracle Cluster Registry configuration upgraded successfully
WARNING: directory '/oracle' is not owned by root
Successfully accumulated necessary OCR keys.
Using ports: CSS=49895 CRS=49896 EVMC=49898 and EVMR=49897.
node <nodenumber>: <nodename> <private interconnect name> <hostname>
node 0: node2 node2-priv node2
node 1: node1 node1-priv node1
Creating OCR keys for user 'root', privgrp 'root'
Operation successful.
Now formatting voting device: /oracle/ocrcfg1
Format of 1 voting devices complete.
Startup will be queued to init within 30 seconds.
Adding daemons to inittab
Expecting the CRS daemons to be up within 600 seconds.
CSS is active on these nodes.
node2
CSS is inactive on these nodes.
node1
Local node checking complete.
Run root.sh on remaining nodes to start CRS daemons.
从输出我们可以看出，该脚本主要执行crs的配置，格式化ocr disk,更新/etc/inittab文件，启动css进程，在/var/opt/oracle/新建了ocr.loc文件及，scls_scr，oprocd文件夹。
2.2 查看crs进程及/etc/inittab文件可以看出节点的变化。
root@node2 # ps -ef|grep crs|grep –v grep
oracle 18212 18211 0 14:47:28 0:00 /oracle/crs/bin/ocssd.bin
oracle 18191 18180 0 14:47:28 0:00 /oracle/crs/bin/oclsmon.bin
oracle 17886 1 0 14:47:27 0:00 /oracle/crs/bin/evmd.bin
oracle 18180 18092 0 14:47:28 0:00 /bin/sh -c cd /oracle/crs/log/node2/cssd/oclsmon; ulimit -c unlimited; /ora