Changes to Azure resource groups/networks after deployment should be reflected in cloud-config.conf

[Drew Freiberger]

Changes to azure-integrator charm configuration for the following configuration is not reflected in the running kubernetes-master /var/snap/kube-controller-manager/common/cloud-config.conf.

- subnetName
- vnetName
- vnetResourceGroup
- vnetSecurityGroup

While this is documented as not being able to be updated after deployment, we have found environments where subnets are migrated to different vnets or vnets are moved to shared resource groups after deployments are unable to support creation of loadbalancers in the changed network topology.

I've found while working with a customer deployment that making the modifications manually to the cloud-config.conf and restarting the snap service kube-controller-manager.daemon does affect the changes necessary to allow for loadbalancer deployment along with the addition of a securityGroupResourceGroup as noted in lp#1915560.

It would be very helpful if changes to this charm could trigger the appropriate cloud-config.conf changes and recycle the controller-manager service on kubernetes-master units.

[Drew Freiberger (afreiberger)]

To note, the relation data from azure-integrator toward it's clients is not updated when the configuration is changed with juju config.

[George Kraft (cynerva)]

Added kubernetes-worker because it also has an azure cloud-config that may need to be updated too.

[Aymen Frikha (aym-frikha)]

Also changes to the azure account password is not reflected in the cloud-config.conf.
The only workaround is to remove and re-add the relation with kubernetes-master.
It's due to that function: https://github.com/juju-solutions/charm-azure-integrator/blob/master/reactive/azure.py#L56 that is only triggered at the initiation of the relation.

[Aymen Frikha (aym-frikha)]

subscribed ~field-high

[George Kraft (cynerva)]

PRs:
https://github.com/juju-solutions/interface-azure-integration/pull/8
https://github.com/juju-solutions/charm-azure-integrator/pull/40
https://github.com/charmed-kubernetes/charm-kubernetes-worker/pull/131