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I have fully-configured instance and create image from them for autoscaling group. When autoscaling setup new instance from this image, it calls cloud-init. And cloud-init changes hostname and breakes fstab.

I want to prevent cloud-init from start on instance launch.

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You can disable cloud-init's modification of /etc/fstab in one of 2 ways.

a.) by providing cloud-config that overrides the default 'mounts' entries and disables them.

mounts:
 - [ephemeral0, null]
 - [swap, null]

b.) by disabling the mounts module from running. This is done by removing it from the 'cloud_config_modules' list that you'll see in /etc/cloud/cloud.cfg.

With regard to hostname, you can also control that also. If you just want to stop cloud-init from modifying /etc/hostname, then:

preserve_hostname: true

Also interesting to you might be manage_etc_hosts.

Both of these are documented in doc/examples/cloud-config.txt (and installed in /usr/share/doc/cloud-init/examples)

I'm interested in knowing how cloud-init is breaking /etc/fstab, though. Please file a bug using ubuntu-bug cloud-init from inside your instance, and describe what it is doing that you think is wrong.

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I do not think this is actually a bug. cloud-init adds swap and ephemeral to /etc/fstab already there. As a result ephemeral mounts to 2 points: /cache and /mnt. Is it safe? – homm Jan 15 '14 at 5:59
    
@homm depends on what you mean by "safe." I don't see anything /dangerous/ about it. – xofer Jun 18 '15 at 20:17
    
@smoser By default, it's mounting just a single volume. I'm provisioning with Chef and don't want to automate umount, so for me cloud-init is "breaking" fstab. – xofer Jun 18 '15 at 20:20
    
Note that you need to run sudo dpkg-reconfigure cloud-init after making changes. – xofer Jun 18 '15 at 20:20

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