[Bug 1832381] Re: vm fails to boot due to conflicting network configuration when user switches from netplan to eni

2019-09-28 Thread Thorsten Meinl 
In my opinion this is serious bug. I created an AWS AMI using packer and
one of the installed packages (salt-minion) pulled in ifupdown. This
then broke network connectivity of instances started from the custom
AMI. I took me five hours to find out what the problem was.

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Title:
  vm fails to boot due to conflicting network configuration when user
  switches from netplan to eni

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[Bug 1802073] Re: No network in AWS (EC-Classic) after stopping and starting instance

2019-09-28 Thread Thorsten Meinl 
The same problem also happens in EC2-VPC mode if the network interface changes. 
This happens if you create a custom AMI, e.g. using Packer, from the official 
Ubuntu 18.04 LTS AMI. The first start by packer writes the MAC address into 
/etc/netplan/50-cloud-init.yaml which gets part of the custom AMI. If you then 
try to launch an instance from that AMI it gets a new network interface with a 
new MAC address and the instance will not have any internet connection.
I tries to call "cloud-init clean" at the end of the packer build but that 
didn't have any positive effect.
It seems the current approach is kind of broken in general.

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https://bugs.launchpad.net/bugs/1802073

Title:
  No network in AWS (EC-Classic) after stopping and starting instance

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