The way this is working in cloud-init seems to me to make some sense.
Basically, there are 3 places cloud-init can get its network configuration. In
order of increasing precedence:
1. datasource (only works for local datasources currently)
2. system configuration
3. kernel command line.
a.) ip= argument: files written by the initramfs networking system
(/run/net-eth0.conf) for example.
b.) network-config= argument. This is yaml formated text blob.
So, if datasource (1) provides network config, but the system says not
to pay attention to it (2), then cloud-init will not write network
config. Similarly if system says it is disabled, but the kernel command
line enables it, then cloud-init will write networking config.
You're kind of hitting a weird situation where the kernel cmdline has
3a, but you dont want cloud-init to render system based on that. (The
reason you dont is a bug somewhere, but I'm not sure, as this does not
happen in many iscsi root scenarios that we have and test).
One solution I think should work for you is if you pass on the kernel command
line:
network-config=eyJuZXR3b3JrIjp7ImNvbmZpZyI6ImRpc2FibGVkIn19fQ==
This is specifying the config to cloud-init in base64 encoded network
config format (described at
http://curtin.readthedocs.io/en/latest/topics/networking.html).
So what you have there is:
$ echo eyJuZXR3b3JrIjp7ImNvbmZpZyI6ImRpc2FibGVkIn19fQ== | base64 --decode ; echo
{"network":{"config":"disabled"}}}
Last thing... I see 'netroot=' on you command line.
I'm guessing that means you've generated an initramfs with dracut?
I do not know how well that would be supported in ubuntu. My experience with
iscsi root is with initramfs-tools which would take a different form of kernel
command line.
In 16.04 and later you should be able to use root=iscsi:<rfc4173>
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=804162
I think that is also supported in dracut if you're looking for something
supported by both.
** Bug watch added: Debian Bug tracker #804162
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=804162
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https://bugs.launchpad.net/bugs/1640635
Title:
cloud-init creates /etc/network/interfaces.d/50-cloud-init.cfg even if
/etc/cloud/cloud.cfg.d/99-disable-network-config.cfg present
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