pre_oracle_install.sh

#! /bin/bash
echo install oracle pre-requisites
groupadd -g 54321 oinstall
groupadd -g 54322 dba
useradd oracle -u 54321 -g oinstall -G dba
echo oracle:oracle | sudo chpasswd
usermod -aG wheel oracle
chown :dba /opt
chmod g+w /opt
dd if=/dev/zero of=/swapfile count=4096 bs=1MiB
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile
yum install -y compat-libcap1.x86_64 libstdc++-devel.x86_64 gcc-c++.x86_64 ksh.x86_64 libaio-devel.x86_64 sysstat.x86_64

echo update limits.conf
echo '' >> /etc/security/limits.conf
cat <<EOT >> /etc/security/limits.conf
oracle       hard    nofile            65536
oracle       soft    stack             10240
oracle       hard    stack             32768
EOT


echo update kernel parameters
cat <<EOT >> /etc/sysctl.conf
kernel.sem = 250 32000 100 128
kernel.shmall = 594650
kernel.shmmax = 3044612096
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128

fs.file-max = 6815744
fs.aio-max-nr = 1048576

net.ipv4.ip_local_port_range = 9000 65535
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
EOT

sysctl -p