Comment 26 for bug 1926460

Reviewed: https://review.opendev.org/c/openstack/charm-mysql-innodb-cluster/+/795989
Committed: https://opendev.org/openstack/charm-mysql-innodb-cluster/commit/737179482c2bfb209a7d322793b4ac925181b639
Submitter: "Zuul (22348)"
Branch: master

commit 737179482c2bfb209a7d322793b4ac925181b639
Author: James Page <email address hidden>
Date: Fri Jun 11 12:14:59 2021 +0100

    clustering: tweak allowlist generation

    Instead of trying to resolve the network CIDR from the local unit
    for all units in the cluster just use the actual IP addresses of
    the cluster unit when generating the IP allowlist for cluster
    connectivity.

    Also add the network CIDR for the local units cluster address
    which is the only one that will be guaranteed to be resolvable.

    For deployments where all units are on the same Layer 2 network
    addition of units with complete automatically - in Layer 3
    routed network topologies new units will be blocked until the
    update-unit-acls action is executed which is a service
    disruption operation.

    Closes-Bug: 1926460
    Change-Id: I16e43c37e1af02fb0e23a9c460d70bf5e1dd0fb1