1. Suggest users and groups

su root　　#Switch to root
groupadd oinstall　　#Create user group oinstall
groupadd dba　　#Create user group dba
useradd -g oinstall -g dba -m oracle　　#Create oracle users and join oinstall and dba user groups
passwd oracle　　#Set the login password of the user oracle, do not set the password, unable to login in the graphic login interface of CentOS
//Note: Password: Sjtsoft123
id oracle # View new oracle users

 

 

2. Create oracle installation directory

[root@Node1 ~]# su - oracle
//Last login: may / December 29 08:50:41 CST 2017pts/0 upper
[oracle@Node1 ~]$ mkdir app    　　#oracle database installation directory
[oracle@Node1 ~]$ mkdir database  #oracle database software package decompression directory
[oracle@Node1 ~]$ mkdir -p app/oradata
[oracle@Node1 ~]$ mkdir -p app/fast_recovery_area

 

ls ා check after creation

3. Unzip the installation package

[oracle@Node1 softwares]$ unzip linuxx64_12201_database.zip -d /home/oracle/database/

[oracle@Node1 softwares]$ unzip oracle11grpmlinux.zip -d  .

 

4. Folder authorization

[root@Node1 app]# chown -R oracle:oinstall /home/oracle/database/database/
[root@Node1 app]# chown -R oracle:oinstall /home/oracle/app/oradata/
[root@Node1 app]# chown -R oracle:oinstall /home/oracle/app/fast_recovery_area/

 

5. Install dependency package

yum is the most convenient to install:

[root@Node1 app]# yum install gcc* gcc-* gcc-c++-* glibc-devel-* glibc-headers-* compat-libstdc* libstdc* elfutils-libelf-devel* libaio-devel* sysstat* unixODBC-* pdksh-*

　　

Or rpm installation (rpm - uvh. / *. rpm -- nodes -- force installation, excluding dependency).

6. Turn off the firewall

service iptables stop
(Note: Centos7:
Turn off the firewall: systemctl stop firewalld.service
Disable firewall: systemctl disable firewalld.service)

[root@Node1 app]# systemctl stop firewalld.service
[root@Node1 app]# systemctl disable firewalld.service

 

7. Close selinux

[root@Node1 app]# sed -i "s/SELINUX=enforcing/SELINUX=disabled/" /etc/selinux/config 
[root@Node1 app]# setenforce 0

　　

8. Modify kernel parameters

Enter editing status: vi /etc/sysctl.conf
Add the following code at the end:

net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.conf.all.rp_filter = 1
fs.file-max = 6815744 #Set the maximum number of open files
fs.aio-max-nr = 1048576 
kernel.shmall = 1887436  #Total shared memory, 8 G Memory settings:2097152*4k/1024/1024 Memory*90%*1024*1024*1024÷4096
kernel.shmmax = 7730941132#Segment size of maximum shared memory (maximum shared memory 2 GB ) Memory*90%*1024*1024*1024
kernel.shmmni = 4096 #Maximum number of shared memory terminals in the whole system
kernel.sem = 250 32000 100 128
net.ipv4.ip_local_port_range = 9000 65500 #Available IPv4 port ranges
net.core.rmem_default = 262144
net.core.rmem_max= 4194304
net.core.wmem_default= 262144
net.core.wmem_max= 1048576

Save and exit.

Make configuration parameters effective immediately: sysctl -p

7. Set restrictions on oracle users to improve software performance

Enter editing status: vim /etc/security/limits.conf
Find the last line ා End of file, and add the following code in the blank line above it:

oracle soft nproc 2047
oracle hard nproc 16384
oracle soft nofile 1024
oracle hard nofile 65536

 # vi /etc/pam.d/login (add or modify the following parameters at the end of the file)

session required pam_limits.so

#vi /etc/profile (add or modify the following script at the end of the file)

if [ $USER = "oracle" ]; then
if [ $SHELL = "/bin/ksh" ]; then
ulimit -p 16384
ulimit -n 65536
else
ulimit -u 16384 -n 65536
fi
fi

 

8. Configure environment variables for users
Enter editing status: vim /home/oracle/.bash_profile (vim ~/.bash_profile)

Simplicity:

export PATH
export ORACLE_SID=gnss
export ORACLE_BASE=/home/oracle/app #oracle database installation directory
export ORACLE_HOME=$ORACLE_BASE/product/11.2.0/db_1
export PATH=$ORACLE_HOME/bin:$PATH

Save and exit.
Make the above configuration take effect immediately: source / home / Oracle /. Bash_

This is all the preparation work. Next, prepare to install.