feat: simplify commands using ansible_user

Some commands such as accessing the control host via SSH or running the
playbooks relies on the `ansible_user` to be defined which is typically
either `ubuntu` or `cloud-user`.

To make this easy we can reuse and export the variable `ssh_user` which
is assigned by the user within `terraform.tfvars`. This should be set to
the user for accessing the machine. Once set and `terraform apply`
executed users can ssh using the command on line 215 verbatim. The same
can be said for the ansible-playbook commands.

Author: jackhodgkiss

README.rst

@@ -196,10 +196,10 @@ If not you can skip those playbook and proceed onto `deploy-openstack-config` wh
 Be sure to replace `ansible_user` with the user you are using to connect to the Ansible control host.
 .. code-block:: console
 
-   ansible-playbook -i ansible/inventory.yml ansible/fix-homedir-ownership.yml -e ansible_user=cloud-user
-   ansible-playbook -i ansible/inventory.yml ansible/add-fqdn.yml -e ansible_user=cloud-user
-   ansible-playbook -i ansible/inventory.yml ansible/grow-control-host.yml -e ansible_user=cloud-user
-   ansible-playbook -i ansible/inventory.yml ansible/deploy-openstack-config.yml -e ansible_user=cloud-user
+   ansible-playbook -i ansible/inventory.yml ansible/fix-homedir-ownership.yml
+   ansible-playbook -i ansible/inventory.yml ansible/add-fqdn.yml
+   ansible-playbook -i ansible/inventory.yml ansible/grow-control-host.yml
+   ansible-playbook -i ansible/inventory.yml ansible/deploy-openstack-config.yml
 
 Deploy OpenStack
 ----------------
@@ -212,7 +212,7 @@ If you choose to opt for automated method you must first SSH into your Ansible c
 
 .. code-block:: console
 
-   ssh cloud-user@$(terraform output -raw ansible_control_access_ip_v4)
+   ssh $(terraform output -raw ansible_user)@$(terraform output -raw ansible_control_access_ip_v4)
    ~/deploy-openstack.sh
 
 This script will go through the process of performing the following tasks

outputs.tf

@@ -6,6 +6,10 @@ output "seed_access_ip_v4" {
   value = openstack_compute_instance_v2.seed.access_ip_v4
 }
 
+output "ansible_user" {
+  value = var.ssh_user
+}
+
 resource "local_file" "hosts" {
   content = templatefile(
     "${path.module}/templates/hosts.tpl",
@@ -97,4 +101,7 @@ resource "ansible_host" "storage" {
 resource "ansible_group" "cluster_group" {
   name     = "cluster"
   children = ["compute", "ansible_control", "controllers", "seed", "storage"]
+  variables = {
+    ansible_user = var.ssh_user
+  }
 }

templates/deploy-openstack.tpl

@@ -60,7 +60,7 @@ set +x
 source $${KOLLA_CONFIG_PATH}/public-openrc.sh
 set -x
 
-~/src/openstack-config/tools/openstack-config
+~/src/openstack-config/tools/openstack-config -- -e ansible_user=${ ssh_user }
 
 git -C $${config_directories[kayobe]} submodule init
 git -C $${config_directories[kayobe]} submodule update