added script and readme

ansible/k8s-init.yaml

@@ -2,6 +2,7 @@
   hosts: k8s_control_plane
   become: true
   vars:
+    ## This is the default networkd of Calico
     pod_network_cidr: "192.168.0.0/16"
     apiserver_advertise_address: "10.50.3.21"
     cri_socket: "unix:///run/containerd/containerd.sock"

ansible/longhorn-reqs.yaml

@@ -0,0 +1,36 @@
+---
+- name: Setup Longhorn Requirements
+  hosts: all
+  become: true
+  tasks:
+
+    - name: Install required packages
+      apt:
+        name:
+          - open-iscsi
+          - nfs-common
+        state: present
+        update_cache: yes
+
+    - name: Ensure iscsi_tcp kernel module is loaded
+      modprobe:
+        name: iscsi_tcp
+        state: present
+
+    - name: Ensure iscsi_tcp module loads on boot
+      copy:
+        dest: /etc/modules-load.d/iscsi.conf
+        content: |
+          iscsi_tcp
+        owner: root
+        group: root
+        mode: '0644'
+
+    - name: Disable and stop multipathd service
+      systemd:
+        name: multipathd
+        enabled: false
+        state: stopped
+        masked: true
+        daemon_reload: yes
+      ignore_errors: true  # in case it's not installed

ansible/master-k8s.yaml

@@ -1,4 +1,5 @@
 # master-k8s.yaml
 - import_playbook: k8s-install-deps.yaml
 - import_playbook: k8s-init.yaml
-- import_playbook: install_cni.yaml
+- import_playbook: install_cni.yaml
+- import_playbook: longhorn-reqs.yaml