mlinux resolv.conf issue

[James Coleman]

We found out that the resolv.conf file loses the nameserver 8.8.8.8 setting when the Conduit is powered down. This is why we were getting the ENOUTFOUND error after I provided my setup to a customer.

Do you know why this happens? Is there a way to set that nameserver 8.8.8.8 value in the resolv.conf file so it is not lost when the Conduit is powered off or is there a way to set this value when the Conduit is powered on?

Thanks,

James

[Brandon Gooch]

Here’s what I did to obtain a persistent DNS config on my Conduit:

1. Remove the /etc/volatile.cache file from the filesytem.
2. Comment out the following entries from /etc/default/volatiles/00_core:

l root root 0644 /etc/resolv.conf /var/run/resolv.conf
f root root 0644 /var/run/resolv.conf none

3. Remove the /etc/resolv.conf symlink.
4. Create your new /etc/resolv.conf

After a reboot, my DNS settings survived.

There is probably a better way to do this, so I hope someone from MultiTech can chime in with some guidance.

• This reply was modified 9 years ago by Brandon Gooch. Reason: Try to fix the code markup conversion

[James Coleman]

Brandon,

Thanks for your post. The problem is when power is removed from the Conduit.
I made the revisions you reference above but the setting still goes away when power is removed from the Conduit.

Thanks,

James

[Jesse Gilles]

As Brandon pointed out, /etc/resolv.conf is configured by default as a “volatile” file and this scheme works well when using DHCP or when using PPP (cellular). A simple workaround for static configuration is to put something like the following in your /etc/network/interfaces file for eth0.

post-up echo “nameserver 8.8.8.8” > /etc/resolv.conf

Jesse

• This reply was modified 9 years ago by Jesse Gilles.

[James Coleman]

Jesse,

Thanks for the information. I will try this and see if this works for us.

James

[Bas van der Pol]

I can confirm that Jesse Gilles his provided solution did the work for us!

Thanks!

Bas

• This reply was modified 8 years, 11 months ago by Bas van der Pol.

[Jeff Clemmer]

Thanks! This worked for me as well.

[Suryadiputra Liawatimena]

Dear all,

My existing resolv.conf symlink into /var/run/resolv.conf
ls -la resolv.conf
lrwxrwxrwx 1 admin root 20 Jun 1 21:39 resolv.conf -> /var/run/resolv.conf

Instruction number 4: create new symlink, the question is: where is the new symlink target?

Thank you very much.

Warmest Regards,
Suryadi

[Bryan Tran]

Hi Suryadi,

You only need to modify your /etc/network/interfaces file by adding the following line:

#Wired interface
auto eth0
….
ipaddress 192.168.2.1
netmask 255.255.255.0
gateway 192.168.2.254
post-up echo “nameserver 8.8.8.8” > /etc/resolv.conf <– Add this line – Setup to obtain a persistent DNS config on the Conduit.
…

Thanks,

BT

[Author]

Posts