Options for bastion, SSH config, static inventory autogeneration

* At the provisioning stage, allow users to auto-generate SSH config,
  when using a static inventory.
* Run playbooks to provsion and post-provision as a separate, when
  using a bastion. This re-applies the SSH config, which ansible can't
  do on the fly.
* Support a pre-installed bastion node, colocated with the 1st infra
  node.
* With a bastion enabled, reduce floating IP footprint to infra and
  dns nodes only, effectively isolating a cluster in a private
  network.

Signed-off-by: Bogdan Dobrelya <bdobreli@redhat.com>

4 files changed, 183 insertions, 2 deletions

diff --git a/roles/openstack-stack/defaults/main.yml b/roles/openstack-stack/defaults/main.yml
index 4831d6bc4..803a96389 100644
--- a/roles/openstack-stack/defaults/main.yml
+++ b/roles/openstack-stack/defaults/main.yml
@@ -4,6 +4,7 @@ ssh_ingress_cidr: 0.0.0.0/0
 node_ingress_cidr: 0.0.0.0/0
 master_ingress_cidr: 0.0.0.0/0
 lb_ingress_cidr: 0.0.0.0/0
+bastion_ingress_cidr: 0.0.0.0/0
 num_etcd: 0
 num_masters: 1
 num_nodes: 1
@@ -11,3 +12,4 @@ num_dns: 1
 num_infra: 1
 nodes_to_remove: []
 etcd_volume_size: 2
+use_bastion: False
diff --git a/roles/openstack-stack/tasks/main.yml b/roles/openstack-stack/tasks/main.yml
index a53e6350b..9b4855294 100644
--- a/roles/openstack-stack/tasks/main.yml
+++ b/roles/openstack-stack/tasks/main.yml
@@ -8,7 +8,6 @@
 - name: set template paths
   set_fact:
     stack_template_path: "{{ stack_template_pre.path }}/stack.yaml"
-    server_template_path: "{{ stack_template_pre.path }}/server.yaml"
     user_data_template_path: "{{ stack_template_pre.path }}/user-data"
 
 - name: generate HOT stack template from jinja2 template
@@ -19,7 +18,13 @@
 - name: generate HOT server template from jinja2 template
   template:
     src: heat_stack_server.yaml.j2
-    dest: "{{ server_template_path }}"
+    dest: "{{ stack_template_pre.path }}/server.yaml"
+
+- name: generate HOT server w/o floating IPs template from jinja2 template
+  template:
+    src: heat_stack_server_nofloating.yaml.j2
+    dest: "{{ stack_template_pre.path }}/server_nofloating.yaml"
+  when: use_bastion|bool
 
 - name: generate user_data from jinja2 template
   template:
diff --git a/roles/openstack-stack/templates/heat_stack.yaml.j2 b/roles/openstack-stack/templates/heat_stack.yaml.j2
index 54941db06..524f466ff 100644
--- a/roles/openstack-stack/templates/heat_stack.yaml.j2
+++ b/roles/openstack-stack/templates/heat_stack.yaml.j2
@@ -156,6 +156,13 @@ resources:
           port_range_min: 22
           port_range_max: 22
           remote_ip_prefix: {{ ssh_ingress_cidr }}
+{% if use_bastion|bool %}
+        - direction: ingress
+          protocol: tcp
+          port_range_min: 22
+          port_range_max: 22
+          remote_ip_prefix: {{ bastion_ingress_cidr }}
+{% endif %}
         - direction: ingress
           protocol: icmp
           remote_ip_prefix: {{ ssh_ingress_cidr }}
@@ -458,7 +465,11 @@ resources:
     properties:
       count: {{ num_etcd }}
       resource_def:
+{% if use_bastion|bool %}
+        type: server_nofloating.yaml
+{% else %}
         type: server.yaml
+{% endif %}
         properties:
           name:
             str_replace:
@@ -483,7 +494,9 @@ resources:
           secgrp:
             - { get_resource: {% if openstack_flat_secgrp|default(False)|bool %}flat-secgrp{% else %}etcd-secgrp{% endif %} }
             - { get_resource: common-secgrp }
+{% if not use_bastion|bool %}
           floating_network: {{ external_network }}
+{% endif %}
           net_name:
             str_replace:
               template: openshift-ansible-cluster_id-net
@@ -540,7 +553,11 @@ resources:
     properties:
       count: {{ num_masters }}
       resource_def:
+{% if use_bastion|bool %}
+        type: server_nofloating.yaml
+{% else %}
         type: server.yaml
+{% endif %}
         properties:
           name:
             str_replace:
@@ -573,7 +590,9 @@ resources:
 {% endif %}
 {% endif %}
             - { get_resource: common-secgrp }
+{% if not use_bastion|bool %}
           floating_network: {{ external_network }}
+{% endif %}
           net_name:
             str_replace:
               template: openshift-ansible-cluster_id-net
@@ -590,7 +609,11 @@ resources:
       removal_policies:
       - resource_list: {{ nodes_to_remove }}
       resource_def:
+{% if use_bastion|bool %}
+        type: server_nofloating.yaml
+{% else %}
         type: server.yaml
+{% endif %}
         properties:
           name:
             str_replace:
@@ -621,7 +644,9 @@ resources:
           secgrp:
             - { get_resource: {% if openstack_flat_secgrp|default(False)|bool %}flat-secgrp{% else %}node-secgrp{% endif %} }
             - { get_resource: common-secgrp }
+{% if not use_bastion|bool %}
           floating_network: {{ external_network }}
+{% endif %}
           net_name:
             str_replace:
               template: openshift-ansible-cluster_id-net
diff --git a/roles/openstack-stack/templates/heat_stack_server_nofloating.yaml.j2 b/roles/openstack-stack/templates/heat_stack_server_nofloating.yaml.j2
new file mode 100644
index 000000000..792a8b90c
--- /dev/null
+++ b/roles/openstack-stack/templates/heat_stack_server_nofloating.yaml.j2
@@ -0,0 +1,149 @@
+heat_template_version: 2016-10-14
+
+description: OpenShift cluster server w/o floating IP
+
+parameters:
+
+  name:
+    type: string
+    label: Name
+    description: Name
+
+  group:
+    type: string
+    label: Host Group
+    description: The Primary Ansible Host Group
+    default: host
+
+  cluster_env:
+    type: string
+    label: Cluster environment
+    description: Environment of the cluster
+
+  cluster_id:
+    type: string
+    label: Cluster ID
+    description: Identifier of the cluster
+
+  type:
+    type: string
+    label: Type
+    description: Type master or node
+
+  subtype:
+    type: string
+    label: Sub-type
+    description: Sub-type compute or infra for nodes, default otherwise
+    default: default
+
+  key_name:
+    type: string
+    label: Key name
+    description: Key name of keypair
+
+  image:
+    type: string
+    label: Image
+    description: Name of the image
+
+  flavor:
+    type: string
+    label: Flavor
+    description: Name of the flavor
+
+  net:
+    type: string
+    label: Net ID
+    description: Net resource
+
+  net_name:
+    type: string
+    label: Net name
+    description: Net name
+
+  subnet:
+    type: string
+    label: Subnet ID
+    description: Subnet resource
+
+  secgrp:
+    type: comma_delimited_list
+    label: Security groups
+    description: Security group resources
+
+  availability_zone:
+    type: string
+    description: The Availability Zone to launch the instance.
+    default: nova
+
+  volume_size:
+    type: number
+    description: Size of the volume to be created.
+    default: 1
+    constraints:
+      - range: { min: 1, max: 1024 }
+        description: must be between 1 and 1024 Gb.
+
+  node_labels:
+    type: json
+    description: OpenShift Node Labels
+    default: {"region": "default" }
+
+outputs:
+
+  name:
+    description: Name of the server
+    value: { get_attr: [ server_nofloating, name ] }
+
+  private_ip:
+    description: Private IP of the server
+    value:
+      get_attr:
+        - server_nofloating
+        - addresses
+        - { get_param: net_name }
+        - 0
+        - addr
+
+resources:
+
+  server_nofloating:
+    type: OS::Nova::Server
+    properties:
+      name:      { get_param: name }
+      key_name:  { get_param: key_name }
+      image:     { get_param: image }
+      flavor:    { get_param: flavor }
+      networks:
+        - port:  { get_resource: port }
+      user_data:
+        get_file: user-data
+      user_data_format: RAW
+      metadata:
+        group: { get_param: group }
+        environment: { get_param: cluster_env }
+        clusterid: { get_param: cluster_id }
+        host-type: { get_param: type }
+        sub-host-type:    { get_param: subtype }
+        node_labels: { get_param: node_labels }
+
+  port:
+    type: OS::Neutron::Port
+    properties:
+      network: { get_param: net }
+      fixed_ips:
+        - subnet: { get_param: subnet }
+      security_groups: { get_param: secgrp }
+
+  cinder_volume:
+    type: OS::Cinder::Volume
+    properties:
+      size: { get_param: volume_size }
+      availability_zone: { get_param: availability_zone }
+
+  volume_attachment:
+    type: OS::Cinder::VolumeAttachment
+    properties:
+      volume_id: { get_resource: cinder_volume }
+      instance_uuid: { get_resource: server_nofloating }
+      mountpoint: /dev/sdb