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Oracle RAC DBA - Oracle Grid Infrastructure INS-20802 Oracle Cluster Verification Utility failed

Date Added: 19 Jan.2020 Date Updated: 19 Jan.2020 Oracle RAC DBA Full Blog

Oracle Grid Infrastructure INS-20802 Oracle Cluster Verification Utility failed

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Start both the nodes 

Ping to both public and private ip’s 
Configure dnsmasq (on both nodes) 
Verify whether dnsmasq is installed 
#rpm –qa |grep dnsmasq 
Configure dnsmasq 
 
create new file “/etc/racdns” with settings for SCAN
[root@rac1 ~]# cat /etc/racdns
# SCAN
192.168.56.91    rac12c-scan.premier.com    rac12c-scan
192.168.56.92    rac12c-scan.premier.com    rac12c-scan
192.168.56.93    rac12c-scan.premier.com    rac12c-scan
 
[root@rac1 ~]#
 
modify dnsmasq default configuration file “/etc/dnsmasq.conf”. One parameter addn-hosts should be changed to point to file “/etc/racdns”. 
#vi /etc/dnsmasq.conf 
addn-hosts=/etc/racdns 
 
#cat /etc/dnsmasq.conf | grep addn-hosts 
addn-hosts=/etc/racdns 
 
 - Start dnsmasq 
service dnsmasq start 
chkconfig dnsmasq on
 
 Next step is to resolve problem with file “/etc/resolv.conf” 
 
I’m using third network card as NAT with DHCP so each time you restart network card or reboot host the file is overwritten with automatically generated settings. Nameserver points for 192.168.1.1 which is required to resolve internet entries but not enough to resolve SCAN settings via dnsmasq. 
As default dnsmasq is running on ip adress 127.0.0.1 so it requires following settings in “/etc/resolv.conf”.
 
cat /etc/resolv.conf 
# Generated by NetworkManager 
nameserver 127.0.0.1 
search appsdba.info 
You must protect the file from being automatically overwritten by host reboot, network card restart etc. 
[root@racerp1 ~]# chattr +i /etc/resolv.conf 
Verification 
It’s just running nslookup to verify all is working fine
 
[root@rac1 ~]# nslookup rac12c-scan.premier.com
Server: 127.0.0.1
Address: 127.0.0.1#53
 
Name: rac12c-scan.premier.com
Address: 192.168.56.92
Name: rac12c-scan.premier.com
Address: 192.168.56.93
Name: rac12c-scan.premier.com
Address: 192.168.56.91
 
[root@rac1 ~]# 
[root@rac1 ~]#
 
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