improve resource documentation for STACKIT LoadBalancer Service

docs/resources/loadbalancer.md

@@ -64,7 +64,9 @@ provider "openstack" {
 
 ### Configuring the supporting infrastructure
 
-The example below uses OpenStack to create the network, router, a public IP address and a compute instance.
+The example below uses OpenStack to create the network, router, a public IP address and a compute instance.  
+The STACKIT Loadbalancer Service automatically adjust necessary Security Groups to its targets,  
+to avoid unnecessary changes in the terraform plan utilising the lifecycle function of terraform can be used.
 
 ## Example Usage
 
@@ -116,6 +118,11 @@ resource "openstack_compute_instance_v2" "example" {
   network {
     name = openstack_networking_network_v2.example.name
   }
+
+  lifecycle {
+    # Security groups are modified by the STACKIT LoadBalancer Service, so terraform should ignore changes here
+    ignore_changes        = [security_groups]
+  }
 }
 
 # Create a router and attach it to the public network

examples/resources/stackit_loadbalancer/resource.tf

@@ -45,6 +45,11 @@ resource "openstack_compute_instance_v2" "example" {
   network {
     name = openstack_networking_network_v2.example.name
   }
+
+  lifecycle {
+    # Security groups are modified by the STACKIT LoadBalancer Service, so terraform should ignore changes here
+    ignore_changes = [security_groups]
+  }
 }
 
 # Create a router and attach it to the public network