RAC Installation Step By Step

RAC Installation Step By Step

All steps will be carried out on one of the node (node1) and later we will clone to other nodes or machines:

Install the system Linux prerequisites:

The package oracle-database-preinstall-19c contains all the prerequisites on Oracle Linux using the Oracle Unbreakable Enterprise Kernel (UEK).

yum install -y oracle-database-preinstall-19c
yum install -y oracleasm-support

sysctl -p
crosscheck >>> cat /etc/sysctl.conf

Group Creation: –

groupadd -g 5001 oinstall
groupadd -g 5002 dba
groupadd -g 5003 oper
groupadd -g 5004 asmadmin
groupadd -g 5005 asmdba
groupadd -g 5006 asmoper

User Creation: –

useradd -u 5007 -g oinstall -G dba,oper,asmdba oracle
useradd -u 5008 -g oinstall -G asmadmin,asmdba,asmoper,dba grid
usermod -g oinstall -G dba,oper,asmdba oracle
usermod -g oinstall -G asmadmin,asmdba,asmoper,dba grid

passwd oracle
passwd grid

Add below entries in /etc/security/limits.conf file which will detine limits

oracle soft nofile 1024
oracle hard nofile 65536
oracle soft nproc 16384
oracle hard nproc 16384
oracle soft stack 10240
oracle hard stack 32768
oracle hard memlock 134217728
oracle soft memlock 134217728

grid soft nofile 1024
grid hard nofile 65536
grid soft nproc 16384
grid hard nproc 16384
grid soft stack 10240
grid hard stack 32768
grid hard memlock 134217728
grid soft memlock 134217728

Create the directories in which the Oracle / Grid software will be installed.

mkdir -p /u01/app/grid
mkdir -p /u01/app/19c/gridhome_1
mkdir -p /u02/app/oracle
mkdir -p /u02/app/oracle/product/19c/dbhome_1
mkdir -p /u01/app/oraInventory
mkdir -p /u01/LATEST_PATCH/
chown -R grid:oinstall /u01
chown -R oracle:oinstall /u02
chown -R grid:oinstall /u01/app/oraInventory
chmod -R 775 /u01
chmod -R 775 /u02

Set bash_profile for grid and oracle user

login to grid user and set .bash_profile :

export TMP=/tmp
export TMPDIR=$TMP
export ORACLE_BASE=/u01/app/grid
export ORACLE_HOME=/u01/app/19c/gridhome_1
export ORACLE_SID=+ASM1
export ORACLE_TERM=xterm
export BASE_PATH=/usr/sbin:$PATH
export PATH=$ORACLE_HOME/bin:$BASE_PATH
export LD_LIBRARY_PATH=$ORACLE_HOME/lib:/lib:/usr/lib
export CLASSPATH=$ORACLE_HOME/JRE:$ORACLE_HOME/jlib:$ORACLE_HOME/rdbms/jlib

login to oracle user and set .bash_profile :

export TMP=/tmp
export TMPDIR=$TMP
export ORACLE_BASE=/u02/app/oracle
export ORACLE_HOME=/u02/app/oracle/product/19c/dbhome_1
export ORACLE_SID=racdb1
export ORACLE_TERM=xterm
export BASE_PATH=/usr/sbin:$PATH
export PATH=$ORACLE_HOME/bin:$BASE_PATH
export LD_LIBRARY_PATH=$ORACLE_HOME/lib:/lib:/usr/lib
export CLASSPATH=$ORACLE_HOME/JRE:$ORACLE_HOME/jlib:$ORACLE_HOME/rdbms/jlib


Add the following entry in /etc/hosts file and crosscheck node reachability

Primary Site:

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

# Private

192.168.10.1 node1-priv.localdomain node1-priv
192.168.10.2 node2-priv.localdomain node2-priv

# Public

192.168.56.71 node1.localdomain node1
192.168.56.72 node2.localdomain node2

# Virtual

192.168.56.81 node1-vip.localdomain node1-vip
192.168.56.82 node2-vip.localdomain node2-vip

# SCAN

192.168.56.91 node-scan.localdomain node-scan
192.168.56.92 node-scan.localdomain node-scan
192.168.56.93 node-scan.localdomain node-scan

Firewall Stop and Disable

We can open firewall after installation

systemctl stop firewalld.service
systemctl disable firewalld.service

Chrony NTP Configuration

systemctl enable chronyd.service
systemctl restart chronyd.service


Verify the network reachability using ping command:

From Node1:
ping node2
ping node2-priv

From Node2:
ping node1
ping node1-priv

Create shared ASM Disk FOR OCR, DATAFILE and ARCHIVE on Both Sites.

Add new shared disk to virtual box machines it should be sharable

Login to system and run ls /dev/sd*
/dev/sda /dev/sda1 /dev/sda2 /dev/sdb
fdisk /dev/sdb

The sequence of answers is "n", "p", "1", "Return", "Return" and "w".

Set ASM disks >>>> oracleasm configure -i
Create ASM disks >>>> oracleasm createdisk ASM1 /dev/sdb1
Scan ASM disks >>>> oracleasm scandisks
List ASM disks >>>> oracleasm listdisks

######### On Primary Site ##########

Copy software to node1 on primary site and unzip software at grid home location and rdbms home locations by login to respective users.

Setup passwordless ssh configuration

cd /u01/app/19c/gridhome_1/deinstall
./sshUserSetup.sh -user grid -hosts "node1 node2" -noPromptPassphrase -confirm -advanced

Similarly do it for oracle user

cd /u02/app/oracle/product/19c/dbhome_1/deinstall

./sshUserSetup.sh -user oracle -hosts "node1 node2" -noPromptPassphrase -confirm –advanced
./sshUserSetup.sh -user root -hosts "node1 node2" -noPromptPassphrase -confirm –advanced

Set profile and go to ORACLE_HOME location from grid user and run following command and follow the steps.

cd $ORACLE_HOME
./gridSetup.sh -applyRU /u01/LATEST_PATCH/32545008

Once Grid Installation done, Install RDBMS Software through oracle user and create RAC database on production (PROD).

./runInstaller -applyRU /u01/LATEST_PATCH/32545008
Use DBCA to create database PROD.