Fix lost IPv6 connectivity on old Debian Buster images when migrating to routed IP

Reviewed on 22 January 2024 • Published on 22 January 2024

On older Debian Buster images, the installed custom version of cloud-init may interfere with the IPv6 connectivity when the Instance has been transitioned to use routed IP. This may be avoided by installing a newer version of cloud-init prior to the migration to routed IP. The procedure is also valid to recover connectivity for an Instance already using routed IP. The procedure to install the newer cloud-init is as follows:

Install the new debian-stable PPA. The URL of the PPA may be configured to use the noble series. Make sure that you replace it with bionic in the URL.

rm -f /etc/apt/sources.list.d/scaleway-ubuntu-stable-bionic.list
add-apt-repository ppa:scaleway/debian-staging
vi /etc/apt/sources.list.d/scaleway-ubuntu-debian-staging-noble.list
Replace `noble` with `bionic`

Following this change, a new version of scaleway-ecosystem and cloud-init may be installed. It is important to clean the previous cloud-init data as the new version contains a structure that may cause a failure of cloud-init at the next boot.

apt update
apt -y install scaleway-ecosystem cloud-init
cloud-init clean

Reboot the Instance for your changes to be taken into effect.