19c rac环境第一次修改public、vip和scan ip，和11g还是稍有不同。首先说明下环境

 具体步骤如下

1、修改public地址，关闭实例后使用root用户操作
[root@db1 ~]#  ./oifcfg getif
bond0  172.20.30.0  global  public
bond2  100.100.100.0  global  cluster_interconnect,asm

[root@db1 ~]#  ./oifcfg delif -global bond0
[root@db1 ~]#  ./oifcfg setif -global bond0/172.20.34.0:public
[root@db1 ~]#  ./oifcfg getif
bond2  100.100.100.0  global  cluster_interconnect,asm
bond0  172.20.34.0  global  public

2.停止has服务--两个主机上操作
[root@db1 ~]#  ./crsctl stop has

3.通过操作系统命令修改public、vip和scan ip地址----两个主机上都操作
  一、编辑/etc/sysconfig/network-scripts/ifcfg-bond0,

         完成后重启systemctl restart network
  二、修改/etc/hosts文件将public IP地址,VIP地址,SCAN地址

4.启动has，使用#crsctl status  res -t查看 ----两个主机上操作
 [root@db1 ~]#  ./crsctl start has

5.查看和修改网络资源-在节点一上操作
 [root@db1 ~]#  ./srvctl config nodeapps -a
Network 1 exists
Subnet IPv4: 172.20.30.0/255.255.255.224/bond0, static
Subnet IPv6:
Ping Targets:
Network is enabled
Network is individually enabled on nodes:
Network is individually disabled on nodes:
VIP exists: network number 1, hosting node db1
VIP Name: db1-vip
VIP IPv4 Address: 172.20.34.3
VIP IPv6 Address:
VIP is enabled.
VIP is individually enabled on nodes:
VIP is individually disabled on nodes:
VIP exists: network number 1, hosting node db2
VIP Name: db2-vip
VIP IPv4 Address: 172.20.34.4
VIP IPv6 Address:
VIP is enabled.
VIP is individually enabled on nodes:
VIP is individually disabled on nodes:
+ASM1:/root@db1>srvctl modify network -k 1 -S 172.20.34.0/255.255.255.0/bond0 -v
Successfully modified Network.
+ASM1:/root@db1>srvctl config network
Network 1 exists
Subnet IPv4: 172.20.34.0/255.255.255.0/bond0, static
Subnet IPv6:
Ping Targets:
Network is enabled
Network is individually enabled on nodes:
Network is individually disabled on nodes:
[root@db1 ~]#  ./srvctl config nodeapps -a
Network 1 exists
Subnet IPv4: 172.20.34.0/255.255.255.0/bond0, static
Subnet IPv6:
Ping Targets:
Network is enabled
Network is individually enabled on nodes:
Network is individually disabled on nodes:
VIP exists: network number 1, hosting node db1
VIP Name: db1-vip
VIP IPv4 Address: 172.20.34.3
VIP IPv6 Address:
VIP is enabled.
VIP is individually enabled on nodes:
VIP is individually disabled on nodes:
VIP exists: network number 1, hosting node db2
VIP Name: db2-vip
VIP IPv4 Address: 172.20.34.4
VIP IPv6 Address:
VIP is enabled.
VIP is individually enabled on nodes:
VIP is individually disabled on nodes:
[root@db1 ~]# 

6、. 修改 SCAN IP--在节点一上操作
[root@db1 ~]#  ./srvctl config scan
SCAN name: db-scan, Network: 1
Subnet IPv4: 172.20.34.0/255.255.255.0/bond0, static
Subnet IPv6:
SCAN 1 IPv4 VIP: 172.20.30.22
SCAN VIP is enabled.
[root@db1 ~]#  ./srvctl stop scan_listener
[root@db1 ~]#  ./srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is not running
[root@db1 ~]#  ./srvctl stop scan
[root@db1 ~]#  ./srvctl modify scan -n db-scan
[root@db1 ~]#  ./srvctl config scan
SCAN name: db-scan, Network: 1
Subnet IPv4: 172.20.34.0/255.255.255.0/bond0, static
Subnet IPv6:
SCAN 1 IPv4 VIP: 172.20.34.5
SCAN VIP is enabled.
[root@db1 ~]#  ./srvctl start scan
[root@db1 ~]#  ./srvctl start scan_listener

 
7、启动实例，查看实例local_listener已自动更新到最新地址
SYS@orcl1> show parameter local

NAME                     TYPE     VALUE
------------------------------------ ----------- ------------------------------
local_listener                 string      (ADDRESS=(PROTOCOL=TCP)(HOST=
                                      172.20.34.3)(PORT=1521))
parallel_force_local             boolean     TRUE
 

不同于11g 环境主要有点

1、vip是系统自动修改，未手动修改

2、实例中local_listener参数也是自动修改