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Updating the network setting after the Virtual Application .ova file deployment

Question asked by Lakshman Varadharajan on Dec 18, 2019
Latest reply on Dec 21, 2019 by Rakhee Tarar

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RSA L&G version 7.1

Environment

Server : Virtual appliance setup using the .ova file

I did the virtual appliance deployment and it took me through the IAG setting page after the ova deployment and it took me to the tabs where i entered the Network settings details of the OS and it was successful. so far i am good.

But now i need to one more domain search to the list which is not working.

I used the YAST command to update what i want system-->network settings-->Hostname and added the new Domain search, but it was not showing up in the /etc/resolve.conf.

What is see in network settings from the YAST is NOT reflected in the /etc/resolve.conf.

Will YAST is the right tool to update the network setting for this virtual appliance? or just directly update the /etc/resolve.conf

Any idea whats going on here ?

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4 Replies

Alex Grant Dec 20, 2019 9:50 AM
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Hi Lakshman,

Are you using any other tools to manage /etc/resolv.conf e.g. netconfig, NetworkManager etc.?
Also, what is your DNS configuration policy set to in YaST (Only Manually/Use Default Policy/Use Custom Policy)?

Cheers,
Alex.
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- Ian Staines @ Alex Grant on Dec 20, 2019 11:12 AM
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  For the most part our installation scripts are simple shell scripts that use regex expressions to manipulate files such as hosts file etc.
  
  YAST should format the files in the correct manner. If you do have to manually edit the files be careful about extra white space and blank lines in the configuration files. These may work correctly for the operating system but confuse the installation scripts.
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Najeeb Peracha Dec 20, 2019 12:41 PM
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The Virtual Application's Setup Interface updates /etc/resolv.conf when you enter the DNS info in option #2 "DNS Setup". The Setup Interface uses the domain part of the FQDN provided earlier in option #1 "Network Setup" as the search domain in /etc/resolv.conf.

When/if you use Yast to add/update search domains, the changes are saved to /etc/resolv.conf.netconfig and are NOT pushed automatically to /etc/resolv.conf. The search domain info is taken from /etc/resolv.conf for name resolution, and not from /etc/resolv.conf.netconfig on the Virtual Application.

You could manually update /etc/resolv.conf to add the additional search domains, however, this has not been tested so unsure if it would have any adverse impact on the Virtual Application or IG&L operations. If you run the Setup Interface and make any changes to option #2 "DNS Setup", /etc/resolv.conf will be overwritten and your custom changes to the search domain would be overwritten.

You should also consider the reason you need to add the additional search domains. You may not need to add search domains, if you always use FQDN for hostnames that would resolve without the need to append search domains.
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Rakhee Tarar Dec 21, 2019 9:42 AM
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Hello Lakshman,

Additional search domain or name servers not updating in resolv.conf ,when you use Yast>Network Devices>Network Settings>Hostname DNS . I believe that's because of NETCONFIG_DNS_POLICY ,that handled by netconfig.
as Alex pointed above. (Its not a problem with platform)

Netconfig uses number of modules to decide what to do in certain situations. Here is config file.
/etc/sysconfig/network/config

That tells not to mess with resolv.conf and changes updating in resolv.conf.netconfig (You will see the "resolv.conf.netconfig" file updated with new search domain)

You can however edit the resolv.conf file to add additional domain(take backup of original file) .
But consider above points that najeeb mentioned.

I believe if the domain is not the correct domain then you may face below error while checking HOSTNAME/IP :
hostname: Name or service not known

Thank you,
Rakhee
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