kubernetes/test/integration/servicecidr/migration_test.go

// TestMigrateServiceCIDR validates the steps necessary to migrate a cluster default ServiceCIDR
// including the existing kubernetes.default service.
// 1. start apiserver with --service-cluster-ip-range 192.168.0.0/29"
// 2. create services to use some addresses on the cidr
// 3. create a temporary new ServiceCIDR 10.168.0.0/24 to migrate the cluster to it
// 4. delete the default service CIDR so the allocators ignore it (it will be pending because of the finalizer and having still IPs)
// 5. recreate the services, the allocator should pick the temporary ServiceCIDR
// 6. start the new apiserver with the new ServiceCIDRs on the flags and shutdown the old one
// 7. delete the kubernetes.default service, the new apiserver will recreate it within the new ServiceCIDR
func TestMigrateServiceCIDR(t *testing.T) { … }