SINGLE CLIENT ACCESS NAME (SCAN) by Barb Lundhild, Markus Michalewicz
I recently read your paper “SINGLE CLIENT ACCESS NAME (SCAN)” online, since I needed one precisely. Let me tell you where I am stuck, and I can’t seem to find a solution from anywhere, including Oracle documentations.
This is just a small educational project that I do at my home system in order to get my certification in OCM, since I am a laid off employee from Oracle and cannot afford to pay more $5000 in order to get the training.
I have two servers with OEL5 update 5 with x64 bit architecture. Each one has 8GB of RAM, two Gigabit NIC cards, and I am setting RAC on these two nodes using Grid Infrastructure. I have a router in between my servers and my ISP. When I tried to install Grid Infrastructure, after running the root.sh on node one which said that the configuration of Grid Infrastructure was successful, I got the following error on the second node when I ran the root.sh on it:
PRCR-1079 : Failed to start resource ora.gns
CRS-5005: IP Address: 192.168.1.110 is already in use in the network
CRS-2674: Start of ‘ora.gns.vip’ on ‘host02’ failed
CRS-2632: There are no more servers to try to place resource ‘ora.gns’ on that would satisfy its placement policy
start gns … failed
During the installation of Grid infrastructure, I selected :
1. Configure GNS
2. GNS Subdomain: host-cluster-scan.localdomain
3. GNS VIP Address: 192.168.1.110 < —————– This IP is not assigned to any machine in my local network yet.
The IPs that got picked up for my NICs, eth0 and eth1, were 192.168.1.0 and 192.168.0.0, respectively.
During the run of root.sh in node one the IP address, 192.168.1.110, was configured as one of the VIP’s address as below:
eth0:1 Link encap:Ethernet HWaddr 00:1E:E5:D6:D2:05
inet addr:192.168.1.110 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:22 Base address:0x8800
When I ran the “ root.sh” on the second node, that is where I got the error above while running root.sh. And as a result, the configuration of Grid Infrastructure as well as the cluster verification check failed. Then I tried to install RAC database software to see if I could still install the database piece, I was only able to see node one in the “ node selection screen”. By the way I used ASM for my OCR and Voting disk. Now, here are my questions:
In your document about SCAN, you mentioned that as long as you have DHCP setup through your public network, VIPs will get assigned by GNS during installation. Well, I do have DHCP running, and I also have DNS addresses in my “ /etc/resolv.conf “ file , like so:
[grid@host01 deinstall]$ cat /etc/resolv.conf
; generated by /sbin/dhclient-script
No matter what IP I choose for the “GNS VIP Address”, this IP address get looked up by Oracle during the run of root.sh for the second node, and sicne it has already been assigned to one of the VIPs for node one, and is no longer available, the configuration ora.gns fails on the second node. And this has become a show stopper for me. I am not sure if this is a bug and has been fixed in 18.104.22.168 or not, but I can’t say. Would you please let me know since you are saying in your document that this is supposed to work?
I would truly appreciate if you provide to me with an explanation of what is going on here and what am I doing incorrectly. Again, I do not have any entries concerning the GNS and DNS in the resolv.conf file or any where in the server. Since this is my home system, I cannot setup the DNS, but all I could get from my ISP is the address of the DNS servers which is in my /etc/resolv.conf file.
P.S. Can you please respond to me in my email
> DNS server names and their corresponding IPs from my ISP.
No, this will not work.
You must configure a small DNS Server/DHCP on a server. GNS will operate as secondary DNS, I believe your router does not have this feature.
See this link … I hope this helps you.
Thank you for the update and the link.
[…] 0 Times in 0 Posts Hi, I recommend you read this white paper.. SINGLE CLIENT ACCESS NAME (SCAN) by Barb Lundhild, Markus Michalewicz Regards, Reply With […]
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