openGauss运行环境初始化脚本

        在直播openGauss训练营后，有部分朋友私下找我要当时执行环境初始化的脚本。其实我的这个脚本比较简单，算是所有shell操作的简单集合吧，在这里贴出来，供需要的小伙伴复制粘贴，提高大家安装openGauss的效率。

#!/bin/bash

##Configure Linux environment For openGauss


## 1.Configure Hosts File
hostnamectl set-hostname prod.opengauss.com
sed -i '/192.168.0.21/d' /etc/hosts
echo "192.168.0.21  prod.opengauss.com   #Gauss OM IP Hosts Mapping" >> /etc/hosts
cat /etc/hosts
echo "1.Configure /etc/hosts completed."
echo -e "\n"

## 2.Disable firewalld service
systemctl disable firewalld.service
systemctl stop firewalld.service
echo "Firewalld " `systemctl status firewalld|grep Active`
echo "2.Disable firewalld service completed."
echo -e "\n"

## 3.Disable SELINUX
sed -i '/^SELINUX=/d' /etc/selinux/config
echo "SELINUX=disabled" >> /etc/selinux/config
cat /etc/selinux/config|grep "SELINUX=disabled"
echo "3.Disable SELINUX completed."
echo -e "\n"


## 4.Configure encoding
echo "LANG=en_US.UTF-8" >> /etc/profile
source /etc/profile
echo $LANG
echo "4.Configure encoding completed."
echo -e "\n"

## 5. Configure Timezone
rm -fr /etc/localtime
ln -s /usr/share/zoneinfo/Asia/Shanghai  /etc/localtime
date -R
hwclock
echo "5.Configure Timezone completed."
echo -e "\n"

## 6. Turn off SWAP
sed -i '/swap/s/^/#/' /etc/fstab
swapoff -a
free -m
echo "6.Close swap partition completed."
echo -e "\n"

## optional options,please take care of this
## echo "MTU=8192" >>  /etc/sysconfig/network-scripts/ifcfg-ens34
## For 10GB Ethernet environment , please set rx = 4096、tx = 4096


## 7. Configure SSH Service 
sed -i '/Banner/s/^/#/'  /etc/ssh/sshd_config
sed -i '/PermitRootLogin/s/^/#/'  /etc/ssh/sshd_config
echo -e "\n" >> /etc/ssh/sshd_config
echo "Banner none " >> /etc/ssh/sshd_config
echo "PermitRootLogin yes" >> /etc/ssh/sshd_config
cat /etc/ssh/sshd_config |grep -v ^#|grep -E 'PermitRoot|Banner'
echo "7.Configure SSH Service completed."
echo -e "\n"

## 8. Configure YUM and Install Packages
mkdir /etc/yum.repos.d/bak
mv /etc/yum.repos.d/*.repo  /etc/yum.repos.d/bak/
wget -O /etc/yum.repos.d/CentOS-Base.repo https://repo.huaweicloud.com/repository/conf/CentOS-7-reg.repo
yum clean all
yum install -y bzip2 python3
yum install -y libaio-devel flex bison ncurses-devel glibc-devel patch redhat-lsb-core readline-devel
echo "8.Configure YUM and Install Packages completed."
echo -e "\n"

## 9. Configure sysctl.conf
cat >> /etc/sysctl.conf << EOF
net.ipv4.tcp_max_tw_buckets = 10000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_keepalive_time = 30
net.ipv4.tcp_keepalive_probes = 9
net.ipv4.tcp_keepalive_intvl = 30
net.ipv4.tcp_retries1 = 5
net.ipv4.tcp_syn_retries = 5
net.ipv4.tcp_synack_retries = 5
net.sctp.path_max_retrans = 10
net.sctp.max_init_retransmits = 10
net.ipv4.tcp_retries2 = 12
vm.overcommit_memory = 0
net.ipv4.tcp_rmem = 8192 250000 16777216
net.ipv4.tcp_wmem = 8192 250000 16777216
net.core.wmem_max = 21299200
net.core.rmem_max = 21299200
net.core.wmem_default = 21299200
net.core.rmem_default = 21299200
net.ipv4.ip_local_port_range = 26000 65535
net.ipv4.ip_local_reserved_ports = 20050-26007
kernel.sem = 250 6400000 1000 25600
vm.min_free_kbytes = 400428  ##suggest to set as physical memory * 5%
net.core.somaxconn = 65535
net.ipv4.tcp_syncookies = 1
net.core.netdev_max_backlog = 65535
net.ipv4.tcp_max_syn_backlog = 65535
net.ipv4.tcp_fin_timeout = 60
kernel.shmall = 1152921504606846720
kernel.shmmax = 18446744073709551615
net.ipv4.tcp_sack = 1
net.ipv4.tcp_timestamps = 1
vm.extfrag_threshold = 500
vm.overcommit_ratio = 90
EOF
sysctl -p
echo "9.Configure sysctl.conf completed."
echo -e "\n"


## 10. Configure resource limits
echo "* soft stack 3072" >> /etc/security/limits.conf
echo "* hard stack 3072" >> /etc/security/limits.conf
echo "* soft nofile 1000000" >> /etc/security/limits.conf
echo "* hard nofile 1000000" >> /etc/security/limits.conf
echo "* soft nproc unlimited" >> /etc/security/limits.d/90-nproc.conf
tail -n 4 /etc/security/limits.conf
tail -n 1 /etc/security/limits.d/90-nproc.conf
echo "10.Configure resource limits completed."
echo -e "\n"

## 11. Close transparent_hugepage
################Only for CentOS [Close transparent_hugepage]#####################
cat >>/etc/rc.d/rc.local<<EOF
if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
   echo never > /sys/kernel/mm/transparent_hugepage/enabled
fi
if test -f /sys/kernel/mm/transparent_hugepage/defrag; then
   echo never > /sys/kernel/mm/transparent_hugepage/defrag
fi
EOF
chmod +x /etc/rc.d/rc.local

## [可选]方法二：
## sed -i '/^GRUB_CMDLINE_LINUX/d' /etc/default/grub
## echo "GRUB_CMDLINE_LINUX=\"rhgb quiet transparent_hugepage=never\"" >> /etc/default/grub
## grub2-mkconfig  -o  /boot/grub2/grub.cfg
##
echo "11.Close transparent_hugepage completed."
echo -e "\n"
################################################################################


################Only for openEuler[Disable RemoveIPC]#####################
## sed -i '/^RemoveIPC/d' /etc/systemd/logind.conf
## sed -i '/^RemoveIPC/d' /usr/lib/systemd/system/systemd-logind.service
## echo "RemoveIPC=no"  >> /etc/systemd/logind.conf
## echo "RemoveIPC=no"  >> /usr/lib/systemd/system/systemd-logind.service
## systemctl daemon-reload
## systemctl restart systemd-logind
## loginctl show-session | grep RemoveIPC
## systemctl show systemd-logind | grep RemoveIPC
## echo "12.Disable RemoveIPC completed."
## echo -e "\n"
## echo -e "\n"
##########################################################################