openGauss是由华为开源的一款关系型数据库，基于PostgreSQL数据库开发。

操作系统：CentOS 7.x

下载地址：https://opengauss.obs.cn-south-1.myhuaweicloud.com/3.1.0/x86/openGauss-3.1.0-CentOS-64bit-all.tar.gz

安装前系统设置

1、关闭SELINUX

vi /etc/selinux/config

#SELINUX=enforcing #注释掉

#SELINUXTYPE=targeted #注释掉

SELINUX=disabled #增加

:wq! #保存退出

setenforce 0 #使配置立即生效

2、开启防火墙5432端口

CentOS 7.x默认使用的是firewall作为防火墙，这里改为iptables防火墙。

2.1、关闭firewall：

systemctl stop firewalld.service #停止firewall

systemctl disable firewalld.service #禁止firewall开机启动

systemctl mask firewalld

systemctl stop firewalld

yum remove firewalld

2.2、安装iptables防火墙

yum install iptables-services #安装

vi /etc/sysconfig/iptables #编辑防火墙配置文件

# sample configuration for iptables service

# you can edit this manually or use system-config-firewall

# please do not ask us to add additional ports/services to this default configuration

*filter

:INPUT ACCEPT [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

-A INPUT -p icmp -j ACCEPT

-A INPUT -i lo -j ACCEPT

-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT

-A INPUT -p tcp -m state --state NEW -m tcp --dport 5432 -j ACCEPT

-A INPUT -j REJECT --reject-with icmp-host-prohibited

-A FORWARD -j REJECT --reject-with icmp-host-prohibited

COMMIT

:wq! #保存退出

systemctl restart iptables.service #最后重启防火墙使配置生效

systemctl enable iptables.service #设置防火墙开机启动

/usr/libexec/iptables/iptables.init restart #重启防火墙

3、操作系统参数设置

cat>> /etc/sysctl.conf <

net.ipv4.tcp_retries1=5

net.ipv4.tcp_syn_retries=5

net.sctp.path_max_retrans=10

net.sctp.max_init_retransmits=10

kernel.shmmax = 17179869184

kernel.shmall = 4194304

kernel.sem=  500 5120000 2500 9000

EOF

lsmod |grep sctp

yum -y install lksctp*

modprobe sctp

sysctl -p #设置立即生效

echo 17179869184 > /proc/sys/kernel/shmmax

echo 4194304 > /proc/sys/kernel/shmall

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

echo never > /sys/kernel/mm/transparent_hugepage/defrag

echo never > /sys/kernel/mm/transparent_hugepage/enabled

echo 'echo never > /sys/kernel/mm/transparent_hugepage/defrag' >> /etc/rc.d/rc.local

echo 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' >> /etc/rc.d/rc.local

chmod +x /etc/rc.d/rc.local

/usr/bin/sh /etc/rc.d/rc.local

4、修改主机名称

这里设置主机名为：opengauss-master

hostnamectl set-hostname opengauss-master #CentOS 7.x 8.x

vi /etc/hostname #编辑配置文件CentOS 7.x

opengauss-master #修改localhost.localdomain为opengauss-master

:wq! #保存退出

vi /etc/hosts #编辑配置文件

127.0.0.1 opengauss-master localhost #修改localhost.localdomain为opengauss-master

192.168.21.128 opengauss-master

:wq! #保存退出

5、设置操作系统字符集编码

LANG=en_US.UTF-8

echo "LANG=en_US.UTF-8" >> /etc/profile

source /etc/profile

echo $LANG

6、设置时区同步时间

rm -rf /etc/localtime #先删除默认的时区设置

ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime #替换上海/北京作为默认

yum install -y ntp #安装ntp

ntpdate time1.aliyun.com #执行时间同步

hwclock --systohc #系统时钟和硬件时钟同步

7、安装依赖包

yum install libaio-devel flex bison ncurses-devel glibc-devel patch redhat-lsb python3 bzip2

#服务器需要用到Python-3.x命令，但CentOS 7.x 默认版本Python-2.7.x，需要切换到Python-3.x版本

mv /usr/bin/python /usr/bin/python.bak

ln -s python3 /usr/bin/python

8、设置yum使用python2.7否则无法通过yum install安装软件

vi /usr/bin/yum

#!/usr/bin/python2.7

:wq! 保存退出