cloud-initramfs-dyn-netconf should work without /etc/network/interfaces symlink
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| cloud-init (Ubuntu) |
Fix Released
|
Medium
|
Unassigned | ||
| Xenial |
Fix Released
|
Medium
|
Unassigned | ||
Bug Description
See [1] for doc on cloud-initramfs
cloud-initramfs
The goal is to have the user's provided 'ip=' kernel parameters be "sticky" and not have the network interface get bounced by normal post-initramfs networking bringup. Essentially kernel command line should override /etc/network/
As it is right now, we have to have ln -sf /etc/network/
That means:
a.) if you've not done this, dyn-netconf isn't much use
b.) if you *have* done this, but not provided ip= then you'll get you'll get no network configuration.
In xenial, the one necessary change from a cloud image to maas image is this symlink, so that the image can work well with networking information being provided on the kernel command line via network boot.
| Changed in cloud-initramfs-tools (Ubuntu): | |
| status: | New → Confirmed |
| importance: | Undecided → High |
| description: | updated |
| Scott Moser (smoser) wrote | #1 |
| Changed in cloud-init (Ubuntu): | |
| status: | New → Fix Released |
| importance: | Undecided → Medium |
| no longer affects: | cloud-initramfs-tools (Ubuntu) |
| Scott Moser (smoser) wrote | #2 |
| Changed in cloud-init (Ubuntu Xenial): | |
| status: | New → Fix Released |
| importance: | Undecided → Medium |
The fix that went in to xenial for this (and present in current yakkety and trunk cloud-init) is for cloud-init to read its networking configuration effectively from the kernel command line.
If cloud-init sees network-config= or ip= on the kernel command line, then it will parse the /run/net-*.conf files that are written by the ipconfig in the initramfs and use them as a source of networking information. The kernel's command line overrides a datasource or builtin configuration, so the end result is that the 'ip=' declares the system's network configuration.