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Defining default user-password for Ubuntu Cloud image

asked 2013-09-29 04:59:49 -0600

Y Sertdemir gravatar image

Hello, I am using Grizzly on Ubuntu 12.04 servers. I deployed Ubuntu 12.04 cloud image to Openstack. It works fine, but when a user creates an instance from this image, he-she will not be able to login immediately because of no user-password. I want to create an Ubuntu Cloud image which prints username-password to the instance log; or uses a static user-password at the first creation of the instance. I have no experience with image creating, is there a simple way to do it, or do I need to build my own image with static password?

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Can you explain why you don't want to use ssh keys for your situation?

lorin gravatar imagelorin ( 2013-12-08 21:10:14 -0600 )edit

Because I want that users of Openstack are able to create their instances without entering console of the nodes. I found the solution below anyway.

Y Sertdemir gravatar imageY Sertdemir ( 2013-12-09 01:27:39 -0600 )edit
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answered 2013-09-29 06:28:50 -0600

Y Sertdemir gravatar image

I found how:

Firstly install guestfish:

# apt-get install guestfish

In order to edit the img file:

# guestfish --rw -a precise-server-cloudimg-amd64-disk1.img

Then, start your image file:

><fs> run

Find the image local disk: 

><fs> list-filesystems
/dev/vda1: ext4

Mount the image disk to guestfish root:

><fs> mount /dev/vg_centosbase/lv_root /

Now, you can edit /etc/cloud/cloud.cfg file in order to load whatever you want when instance created. I wanted to set user password for ubuntu user, so I added these lines to the cloud.cfg file:

password: RANDOM
chpasswd: { expire: False }
ssh_pwauth: True

Save and exit from guestfish. That's it! :)

You can import this modified image to Openstack and Ubuntu password will be randomly created and printed to Console-log of the instance:

Generation complete.
Set the following passwords

ubuntu:fcaKfNdsB

guestfish operation referance: http://docs.openstack.org/image-guide/content/ch_modifying_images.html

For other options in cloud.cfg file: http://bazaar.launchpad.net/~cloud-init-dev/cloud-init/trunk/view/head:/doc/examples/cloud-config.txt

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This method doesn't seem to work. The password is not printed to the log at all.

1overcosc gravatar image1overcosc ( 2014-08-05 15:50:05 -0600 )edit

Unfortunately, it was working with Grizzly version. At Havana, I guess they updated the cloud-config package and there is no password generation.

Y Sertdemir gravatar imageY Sertdemir ( 2014-09-29 08:11:55 -0600 )edit
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answered 2013-12-08 17:21:45 -0600

dudeofthestick gravatar image

Maybe its too late, but you can pass as user data the following cloud-init configuration to use the ubuntu user from the console and from ssh:

/#cloud-config
password: mysecret
chpasswd: { expire: False }
ssh_pwauth: True

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The answer is correct but the "/" at the beginning of the doesn't seem to work. See also https://ask.openstack.org/en/question/26817/how-to-prevent-cloud-init-from-disable-ssh-passwordauthentication/ (https://ask.openstack.org/en/question...)

MCo gravatar imageMCo ( 2014-08-27 08:07:06 -0600 )edit
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answered 2016-03-14 00:22:10 -0600

Suresh Dharavath gravatar image

Adding a bit more to dudeofthestick's answer. Yes you should remove the "/" from there( while publishing the answer, having # in front of any line makes it bold so to suppress it he used the / infront )

cat > my-user-data <<eof< p="">

#cloud-config

password: mysecret

chpasswd: { expire: False }

ssh_pwauth: True

EOF

Once that is done launch the VM using

kvm -net nic -net user -hda disk.qcow2 -hdb my-user-data -m 512

Now login with myscreat as password and create your own user( as to login with default user all the time, we have to seed the mysecret all the time ) and set the password for that user. Now every time you login you can login through the user you have added.

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Similiarly can we set password for root??

udayutkarsh gravatar imageudayutkarsh ( 2017-02-21 02:16:36 -0600 )edit
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answered 2017-06-15 22:22:29 -0600

ryanhornbeck gravatar image

guestfish -a cloud-img.img (CentOS or Ubuntu, doesn't matter which one) <fs>run <fs>list-filesystems <fs>mount /dev/blah / <fs>vi /etc/passwd

Change root:x:... in the first line to root::...and write to disk with wq!

<fs>shutdown

Add .img to virt-manager, creating new instance. Now you can log in with no password as root.

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Asked: 2013-09-29 04:59:49 -0600

Seen: 29,292 times

Last updated: Jun 15 '17

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