--0、新增服务器，内存CPU本地盘参考已有节点，做好如下配置

A、安装缺失的rpm

rpm -qa --qf '%{NAME}%{VERSION}-%{RELEASE} (%{ARCH})\n' bc binutils elfutils-libelf elfutils-libelf-devel fontconfig-devel glibc glibc-devel ksh libaio libaio-devel libXrender libX11 libXau libXi libXtst libgcc libnsl librdmacm libstdc++ libstdc++-devel libxcb libibverbs make smartmontools sysstat net-tools nfs-utils compat-libcap1

安装Xstart支持：

yum -y install xorg-x11-xauth

yum -y install xterm

--为了支持双节点GI的RU升级

yum -y install xorg-x11-utils

yum -y install psmisc

B、/etc/hosts、网卡

C、DNS

D、NTP

E、关闭numa功能、透明大页

F、关闭防火墙和SULINUX

G、网关

H、内核参数

I、资源限制

J、共享内存段

K、添加用户、组、文件夹

L、profile

M、三机互信

N、多路径

--1、节点3的其余两个网卡配置如下

[root@Hub3 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth1

TYPE=Ethernet

PROXY_METHOD=none

BROWSER_ONLY=no

BOOTPROTO=static

DEFROUTE=yes

IPV4_FAILURE_FATAL=no

IPV6INIT=no

IPV6_AUTOCONF=yes

IPV6_DEFROUTE=yes

IPV6_FAILURE_FATAL=no

IPV6_ADDR_GEN_MODE=stable-privacy

NAME=eth1

UUID=f19e2b0f-04c7-42d2-bf26-6c44100cc5d7

DEVICE=eth1

ONBOOT=yes

IPADDR=10.0.0.163

PREFIX=8

GATEWAY=10.0.0.1

[root@Hub3 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth2

TYPE=Ethernet

PROXY_METHOD=none

BROWSER_ONLY=no

BOOTPROTO=static

DEFROUTE=yes

IPV4_FAILURE_FATAL=no

IPV6INIT=no

IPV6_AUTOCONF=yes

IPV6_DEFROUTE=yes

IPV6_FAILURE_FATAL=no

IPV6_ADDR_GEN_MODE=stable-privacy

NAME=eth2

UUID=9b5bc917-cf9f-4b86-bce0-70362ec751ca

DEVICE=eth2

ONBOOT=yes

IPADDR=5.0.0.163

PREFIX=8

GATEWAY=5.0.0.1

[root@Hub3 ~]#

--2、三个节点均安装与配置

yum install policycoreutils-python

vi /etc/sysctl.conf

net.ipv4.conf.eth2.rp_filter = 2

net.ipv4.conf.eth1.rp_filter = 2

net.ipv4.conf.eth0.rp_filter = 1

sysctl -p

[root@Hub3 ~]# cat > /etc/hosts

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4

::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.113.161 Hub1

192.168.113.162 Hub2

192.168.113.168 Hub3

10.0.0.161 Hub1-priv

10.0.0.162 Hub2-priv

10.0.0.163 Hub3-priv

5.0.0.161 Hub1-asm

5.0.0.162 Hub2-asm

5.0.0.163 Hub3-asm

192.168.113.163 Hub1-vip

192.168.113.164 Hub2-vip

192.168.113.169 Hub3-vip

192.168.113.165 Hub-cluster-scan.Oracle19c.com Hub-cluster-scan

192.168.113.166 Hub-cluster-scan.Oracle19c.com Hub-cluster-scan

192.168.113.167 Hub-cluster-scan.Oracle19c.com Hub-cluster-scan

--3、节点3解压安装包

su - grid

cd /u01/app/19.0.0/grid/

unzip LINUX.X64_193000_grid_home.zip

--4、节点2安装前检验节点3

su - grid

cd /u01/app/19.0.0/grid/bin/

./cluvfy comp peer -refnode Hub2 -n Hub3 -verbose

预期结果为：

Verifying Peer Compatibility ...PASSED

Verification of peer compatibility was successful.

CVU operation performed: peer compatibility

Date: Feb 16, 2022 6:00:35 PM

CVU home: /u01/app/19.0.0/grid/

User: grid

[grid@Hub2 bin]$

--5、grid在节点2登陆xstart安装crs

cd /u01/app/19.0.0/grid/

./gridSetup.sh

--6、oracle在节点2登陆xstart安装db

cd $ORACLE_HOME/addnode

./addnode.sh "CLUSTER_NEW_NODES={Hub3}"

7、确认补丁自动过来

su - grid & oracle

$ORACLE_HOME/OPatch/opatch lsinventory

8、oracle在节点2登陆xstart创建节点3的实例

cd /u01/app/oracle/product/19.0.0/dbhome_1/bin

./dbca