For a cluster is necessary to attach security groups to machine pools to allow traffic between subnets/managed services/etc... Unless those security groups are associated with the machine pool at creation time, scaling up and down the number of machines in the pool will not get the security groups attached correctly and would require manually attaching the security groups to the machines.
For a cluster is necessary to attach security groups to machine pools to allow traffic between subnets/managed services/etc... Unless those security groups are associated with the machine pool at creation time, scaling up and down the number of machines in the pool will not get the security groups attached correctly and would require manually attaching the security groups to the machines.