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not to attempt renaming the network interface to the default interface. Default
interface is controleld by net.DEFAULT_PRIMARY_INTERFACE and is currently set
to eth0 for legacy reasons. By default cloud-init will not attempt to rename
the device as this does not work in some situtations depending on the backing
driver of the device.
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try/except blocks because there are sometimes read errors on the files and this
should not cause a stacktrace
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on in the event that no network configuration was provided to cloud-init
- Devices in /sys/class/net aside from loopback devices are scanned
- Each device is tested to determine if it has a carrier using
/sys/class/net/DEV/carrier, devices which do are preferred as they are most
likely connected to the outside world
- Devices which do not have a carrier but which might still be connected due
to being in a dormant or down state are used as fallbacks in case no
devices are found which have a carrier
- A network state dictionary is generated to be passed to
render_network_state to write ENI
- A systemd link file is generated that will rename the chosen device to eth0
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at this point, this works:
python -m cloudinit.net.network_state examples/network-all.yaml
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just add curtin/net as cloudinit/net
and then copy curtin/udev.py as cloudinit/net/udev.py
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