Ubuntu
cloud-init package

cloud-init manage-resolv-conf not working as expected

Asked by Jay Rosenthal

New to using cloud-init with OpenStack so please be patient and kind ;-)

I am having trouble getting manage-resolv-conf to work from my cloud-config file. The target instance has Ubuntu 12-04 as the OS. I do not see the nameservers (and other setting) being set in the /etc/resolv.conf file, nor do I see the comments that cloud-init puts in there indicating is it managed by cloud-init.

My cloud-config looks like this:

#cloud-config

manage_resolv_conf: true
manage-resolv-conf: True

manage_etc_hosts: true

# Automatically configure resolv.conf when the instance boots for the first time.
resolv_conf:
  nameservers: ['10.0.0.3','10.5.96.20', '10.5.96.21','8.8.8.8']
  searchdomains:
  - novalocal
  domain: novalocal
  options:
    rotate: true
    timeout: 1

fqdn: Test19.novalocal

Question #1 - What is the correct syntax of manage-resolv-conf: ? Is it with "-" or "_" ? I believe it is "-" , but I have seen examples using both. I have tried it both ways but still no success.

Question #2 - I read somewhere that this may only supported on RedHat distributions. Is that correct ?

If question #2 is false, then why else might this not be working ?

Any suggestions, help or guidance would be appreciated.

Jay R.

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actionparsnip (andrew-woodhead666) said : 		#1

Try:

echo "nameserver 8.8.8.8" | sudo tee -a /etc/resolvconf/resolv.conf.d/head

Will set that nameserver at each boot

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Jay Rosenthal (jay-rosenthal) said : 		#2

Thanks for the reply..
Are you suggesting I put that as part of the "runcmd:" section of cloud-config ?

I can give this a try as a workaround, but it really doesn't answer my questions :-)

I've been seeing lots of people struggling with resolvconf behaviors in Ubuntu 12-04

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Édouard Thuleau (ethuleau) said : 		#3

Hi,

I also try to manage resolv.conf file with cloud-init.
I use that cloud-init user data:

#cloud-config

manage-resolv-conf: false

resolv_conf:
  nameservers: ['8.8.4.4', '8.8.8.8']
  options:
    rotate: true
    timeout: 1

But it fails. I made that test on UEC Ubuntu 13.10 image with cloud-init version 0.7.3

I reopen that question because the actionparsnip does not aswert to it.
I use that type of workaround but it is not the solution:

#cloud-config

runcmd:
  - [ sh, -xc, "DEBIAN_FRONTEND=noninteractive apt-get remove -y resolvconf" ]
  - [ sh, -xc, "sed -i 's/domain-name-servers, domain-search, //' /etc/dhcp/dhclient.conf" ]
  - [ sh, -xc, "service networking restart" ]
  - [ sh, -xc, "sed -i '/nameserver/d' /etc/resolv.conf" ]
  - [ sh, -xc, "echo 'nameserver 8.8.8.8' >> /etc/resolv.conf" ]
  - [ sh, -xc, "echo 'nameserver 8.8.4.4' >> /etc/resolv.conf" ]

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Édouard Thuleau (ethuleau) said : 		#4

In fact, i cannot reopen the question because I'm not the owner.
Jay could you reopen it?

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Édouard Thuleau (ethuleau) said : 		#5

I also try to set 'manage-resolv-conf' to true and it's the same.
resolv/conf file is not updated accordingly to the user data and I cannot see any error in the cloud-init logs.

Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#6

It was never closed. The only person who can close the question is the asker. I marked the question as answered as I did in fact give an answer. The question is done when it is marled as 'solved'. This, again, can only be done by the asker. That person is not me.

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Édouard Thuleau (ethuleau) said : 		#7

Ha ok, I thought 'answwer' was the last question status.
I did not know the 'solved' status.
Sorry actionparsnip.

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Claude Durocher (claude-d) said : 		#8

In cloud-init user data use :

manage_etc_hosts: true
fqdn: guestname.domain

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Mark Horstman (mah042) said : 		#9

manage-resolve-conf: true is incorrect. If you look at the source, it's expecting:
manage_resolve_conf: true

see ~line 97: http://bazaar.launchpad.net/~cloud-init-dev/cloud-init/trunk/view/head:/cloudinit/config/cc_resolv_conf.py

The example at http://cloudinit.readthedocs.org/en/latest/topics/examples.html#configure-an-instances-resolv-conf is wrong.

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Loic Dachary (dachary) said : 		#10

Even with manage_resolve_conf: true it does not work, most probably because cloud.cfg does not activate resolv_conf by default on Ubuntu 14.04

Revision history for this message
Mike Henry (mike-henry) said : 		#11

Confirmed that resolv_conf is not activated in cloud.cfg on Ubuntu 16.04 LTS either.

Why is this module not active by default in Ubuntu?

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