add resolv_conf role to compute script

Author: bertiethorpe

ansible/.gitignore

@@ -58,4 +58,6 @@ roles/*
 !roles/squid/**
 !roles/tuned/
 !roles/tuned/**
+!roles/compute_init/
+!roles/compute_init/**
 

ansible/extras.yml

@@ -36,3 +36,11 @@
   tasks:
     - import_role:
         name: persist_hostkeys
+
+- name: Inject ansible-init compute script
+  hosts: compute_init
+  tags: compute_init
+  become: yes
+  tasks:
+    - import_role:
+        name: compute_init

ansible/roles/compute_init/files/compute-init.yml

@@ -0,0 +1,59 @@
+---
+
+- name: Compute node initialisation
+  hosts: localhost
+  become: yes
+  vars:
+    control_node_ip: "172.16.1.228"
+    nfs_export: "/exports/hosts"
+    resolv_conf_nameservers: []
+
+  tasks:
+    - name: Configure resolve.conf
+      block:
+        - name: Set nameservers in /etc/resolv.conf
+          ansible.builtin.template:
+            src: /etc/ansible-init/templates/resolv.conf.j2
+            dest: /etc/resolv.conf
+            owner: root
+            group: root
+            mode: u=rw,og=r
+
+        - name: Disable NetworkManager control of resolv.conf
+          ansible.builtin.copy:
+            src: /etc/ansible-init/files/NetworkManager-dns-none.conf
+            dest: /etc/NetworkManager/conf.d/90-dns-none.conf
+            owner: root
+            group: root
+            mode: u=rw,og=r
+          register: _copy_nm_config
+
+        - name: Reload NetworkManager
+          ansible.builtin.systemd:
+            name: NetworkManager
+            state: reloaded
+          when: _copy_nm_config.changed | default(false)
+
+    - name: Mount /etc/hosts on compute nodes
+      block:
+        - name: Ensure the mount directory exists
+          file:
+            path: /mnt/hosts
+            state: directory
+            mode: 0755
+        
+        - name: Mount NFS export
+          mount:
+            path: /mnt/hosts
+            src: "{{ vars.control_node_ip }}:{{ nfs_export }}"
+            fstype: nfs
+            opts: rw,sync
+            state: mounted
+
+        - name: Copy /exports/hosts contents to /etc/hosts
+          copy:
+            src: /mnt/hosts/hosts
+            dest: /etc/hosts
+            owner: root
+            group: root
+            mode: 0644

ansible/roles/compute_init/tasks/main.yml

@@ -0,0 +1,45 @@
+---
+
+- name: Ensure templates directory exists
+  file: 
+    path: /etc/ansible-init/templates
+    state: directory
+    owner: root
+    group: root
+    mode: 0644
+
+- name: Inject templates
+  copy:
+    src: '{{ item }}'
+    dest: '/etc/ansible-init/templates/{{ item | basename }}'
+    owner: root
+    group: root
+    mode: 0644
+  loop:
+    - ../../resolv_conf/templates/resolv.conf.j2
+
+- name: Ensure files directory exists
+  file: 
+    path: /etc/ansible-init/files
+    state: directory
+    owner: root
+    group: root
+    mode: 0644
+
+- name: Inject files
+  copy:
+    src: '{{ item }}'
+    dest: '/etc/ansible-init/files/{{ item | basename }}'
+    owner: root
+    group: root
+    mode: 0644
+  loop:
+    - ../../resolv_conf/files/NetworkManager-dns-none.conf
+
+- name: Inject compute initialisation playbook
+  copy:
+    src: compute-init.yml
+    dest: /etc/ansible-init/playbooks/compute-init.yml
+    owner: root
+    group: root
+    mode: 0644

environments/common/inventory/groups

@@ -134,4 +134,7 @@ freeipa_client
 # Hosts to run TuneD configuration
 
 [ansible_init]
-# Hosts to run linux-anisble-init
+# Hosts to run linux-anisble-init
+
+[compute_init]
+# Hosts to deploy compute initialisation ansible-init script to.

environments/common/layouts/everything

@@ -80,4 +80,8 @@ openhpc
 
 [ansible_init:children]
 # Hosts to run ansible-init
-cluster
+cluster
+
+[compute_init:children]
+# Hosts to deploy compute initialisation ansible-init script to.
+compute