On Fri, Aug 17, 2018 at 4:08 PM Mike Gerdts <[email protected]> wrote:
> On Mon, Jul 30, 2018 at 7:03 AM, Shyam Prasad N <[email protected]> > wrote: > >> Hi all, >> >> I've been going through the documentation for cloud-init for the past few >> days, and experimenting with VMs. >> I still do not understand a few things. I'd appreciate if someone could >> clarify this for me. >> >> 1. How does cloud-init select a datasource? Does it go through all the >> available datasources till it gets a valid meta-data and user-data? >> > > I believe so. However, this can be tweaked, as seems to be on > debian-derived distros. > > $ cat /etc/cloud/cloud.cfg.d/90_dpkg.cfg > # to update this file, run dpkg-reconfigure cloud-init > datasource_list: [ SmartOS ] > This is in fact what cloud-init reads. If that is not declared in any cloud.cfg file it will use the builtin full list. That is intended to always be safe. > 2. Is there a way to verify a cloud-config yaml file, before I go for the >> actual run with the file? >> >> > I'll leave that to someone else. > > A few options a.) first verify '#cloud-config' files are valid yaml. I have a program 'yaml-dump' that I run to verify yaml: http://paste.ubuntu.com/p/sMgNsgMZn4/ . If it is not valid yaml, then cloud-init is not going to load it. b.) there is a 'cloud-init devel schema' command that can help you. Some of the cloudinit 'config modules' have a schema builtin now and they will check the config. We're working to improve that over time. c.) launch quickly-ish in a container rather than on another platform. lxd makes this quite easy. Install lxd on just about any platform. https://linuxcontainers.org/lxd/getting-started-cli/ . Then you can do: $ lxc launch ubuntu-daily:xenial mytest "--config=user.meta-data=$(cat your-file.yaml)"
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