Optimize PXE config templating

metal/group_vars/all.yml

@@ -1,5 +1,6 @@
 iso_url: "https://mirrors.nhanhoa.com/centos/8.3.2011/isos/x86_64/CentOS-8.3.2011-x86_64-dvd1.iso"
 
 disk: "sda"
+dns_server: "8.8.8.8"
 network_interface: "eno1"
 ssh_public_key: "{{lookup('file', '~/.ssh/id_rsa.pub') }}"

metal/playbook.yml

@@ -1,5 +1,6 @@
 - name: Install OS on empty nodes
-  hosts: controller
+  hosts: all
+  gather_facts: no
   vars_prompt:
     - name: username
       prompt: Enter username for metal nodes

metal/roles/pxe-boot/tasks/main.yml

@@ -1,72 +1,12 @@
-- name: Create build directory
-  file:
-    path: "{{ item }}"
-    state: directory
-  loop:
-    - "{{ role_path }}/build"
-    - "{{ role_path }}/build/images"
-    - "{{ role_path }}/build/mnt"
+- name: Render configs and start PXE server
+  include_tasks:
+    file: server.yml
+  run_once: yes
+  when:
+    - "'controller' in group_names"
 
-# - name: Download ISO
-#   get_url:
-#     url: "{{ iso_url }}"
-#     dest: "{{ role_path }}/build/images/centos8.iso"
-
-- name: Mount the ISO
-  mount:
-    src: "{{ role_path }}/build/images/centos8.iso"
-    path: "{{ role_path }}/build/mnt"
-    fstype: iso9660
-    opts: loop,ro
-    state: mounted
-  become: yes
-
-- name: Copy configs
-  copy:
-    src: "{{ role_path }}/templates/"
-    dest: "{{ role_path }}/build"
-
-- name: Render DHCP config
-  template:
-    src: dhcp/dhcpd.conf.j2
-    dest: "{{ role_path }}/build/dhcp/dhcpd.conf"
-
-- name: Render GRUB config
-  template:
-    src: tftp/tftpboot/grub.cfg.j2
-    dest: "{{ role_path }}/build/tftp/tftpboot/grub.cfg"
-
-- name: Render shared kickstart config
-  template:
-    src: http/kickstart/centos8.ks.j2
-    dest: "{{ role_path }}/build/http/kickstart/centos8.ks"
-
-- name: Render seperate network kickstart config for each node
-  template:
-    src: http/kickstart/network/network.ks.j2
-    dest: "{{ role_path }}/build/http/kickstart/network/{{ hostvars[item]['mac'] }}.ks"
-  loop: "{{ groups['metal'] }}"
-
-- name: Start PXE server
-  docker_compose:
-    project_src: "{{ role_path }}/build"
-    build: yes
-  delegate_to: localhost
-
-- name: Unconditionally shut down the machine with all defaults
-  community.general.shutdown:
-    delay: 0
-
-- name: Wait for the machine to shutdown
-  wait_for:
-    timeout: 30
-  delegate_to: localhost
-
-- name: Send magic Wake-on-LAN packet
-  community.general.wakeonlan:
-    mac: "{{ hostvars[inventory_hostname]['mac'] }}"
-  delegate_to: localhost
-
-- name: Wait for the servers to comes up
-  wait_for_connection:
-    timeout: 600
+- name: Wakes the nodes up and install OS on them
+  include_tasks:
+    file: wake.yml
+  when:
+    - "'metal' in group_names"

metal/roles/pxe-boot/tasks/server.yml

@@ -0,0 +1,62 @@
+- name: Gather network facts
+  ansible.builtin.setup:
+    gather_subset:
+      - network
+
+- name: Create build directory
+  file:
+    path: "{{ item }}"
+    state: directory
+  loop:
+    - "{{ role_path }}/build"
+    - "{{ role_path }}/build/images"
+    - "{{ role_path }}/build/mnt"
+
+# - name: Download ISO
+#   get_url:
+#     url: "{{ iso_url }}"
+#     dest: "{{ role_path }}/build/images/centos8.iso"
+#   delegate_to: localhost
+
+- name: Mount the ISO
+  mount:
+    src: "{{ role_path }}/build/images/centos8.iso"
+    path: "{{ role_path }}/build/mnt"
+    fstype: iso9660
+    opts: loop,ro
+    state: mounted
+  become: yes
+
+- name: Copy configs
+  copy:
+    src: "{{ role_path }}/templates/"
+    dest: "{{ role_path }}/build"
+
+- name: Render DHCP config
+  template:
+    src: dhcp/dhcpd.conf.j2
+    dest: "{{ role_path }}/build/dhcp/dhcpd.conf"
+
+- name: Render GRUB config
+  template:
+    src: tftp/tftpboot/grub.cfg.j2
+    dest: "{{ role_path }}/build/tftp/tftpboot/grub.cfg"
+
+- name: Render shared kickstart config
+  template:
+    src: http/kickstart/centos8.ks.j2
+    dest: "{{ role_path }}/build/http/kickstart/centos8.ks"
+
+- name: Render seperate network kickstart config for each node
+  template:
+    src: http/kickstart/network/network.ks.j2
+    dest: "{{ role_path }}/build/http/kickstart/network/{{ hostvars[item]['mac'] }}.ks"
+  loop: "{{ groups['metal'] }}"
+
+- name: Start PXE server
+  docker_compose:
+    project_src: "{{ role_path }}/build"
+    state: present
+    restarted: yes
+    build: yes
+    recreate: always

metal/roles/pxe-boot/tasks/wake.yml

@@ -0,0 +1,18 @@
+- name: Unconditionally shut down the machine with all defaults
+  community.general.shutdown:
+    delay: 0
+  ignore_unreachable: yes
+
+- name: Wait for the machine to shutdown
+  wait_for:
+    timeout: 30
+  delegate_to: localhost
+
+- name: Send magic Wake-on-LAN packet
+  community.general.wakeonlan:
+    mac: "{{ hostvars[inventory_hostname]['mac'] }}"
+  delegate_to: localhost
+
+- name: Wait for the servers to comes up
+  wait_for_connection:
+    timeout: 600

metal/roles/pxe-boot/templates/dhcp/dhcpd.conf.j2

@@ -5,13 +5,13 @@ option pxelinux.pathprefix code 210 = text;
 option pxelinux.reboottime code 211 = unsigned integer 32;
 option architecture-type code 93 = unsigned integer 16;
 
-subnet {{ subnet }} netmask {{ netmask }} {
-option routers {{ gateway }};
-range {{ range_start }} {{ range_end }};
+subnet {{ ansible_default_ipv4.network }} netmask {{ ansible_default_ipv4.netmask }} {
+    option routers {{ ansible_default_ipv4.gateway }};
+    range {{ ansible_default_ipv4.gateway | ansible.netcommon.ipmath(1) }} {{ ansible_default_ipv4.broadcast | ansible.netcommon.ipmath(-1) }};
 
     class "pxeclients" {
         match if substring (option vendor-class-identifier, 0, 9) = "PXEClient";
-        next-server {{ pxe_server }};
+        next-server {{ ansible_default_ipv4.address }};
 
         if option architecture-type = 00:07 {
             filename "grubx64.efi";

metal/roles/pxe-boot/templates/http/kickstart/centos8.ks.j2

@@ -1,6 +1,6 @@
 %pre --interpreter=/bin/sh
 mac=$(ip --brief link show dev {{ network_interface }} | tr -s ' ' | cut -d ' ' -f 3 | sed 's/:/-/g')
-curl "http://{{ pxe_server }}/kickstart/network/$mac.ks" > /tmp/network.ks
+curl "http://{{ ansible_default_ipv4.address }}/kickstart/network/$mac.ks" > /tmp/network.ks
 %end
 
 #version=RHEL8
@@ -17,9 +17,9 @@ lang en_US.UTF-8
 
 # Network information
 %include /tmp/network.ks
-repo --name="AppStream" --baseurl=http://{{ pxe_server }}/CentOS/AppStream
+repo --name="AppStream" --baseurl=http://{{ ansible_default_ipv4.address }}/CentOS/AppStream
 # Use network installation
-url --url="http://{{ pxe_server }}/CentOS/"
+url --url="http://{{ ansible_default_ipv4.address }}/CentOS/"
 # Disable Setup Agent on first boot
 firstboot --disable
 # Do not configure the X Window System

metal/roles/pxe-boot/templates/http/kickstart/network/network.ks.j2

@@ -1,2 +1,2 @@
-network --bootproto=static --device={{ network_interface }} --ip={{ hostvars[item]['ansible_host'] }} --gateway={{ gateway }} --nameserver={{ dns }} --netmask={{ netmask }} --ipv6=auto --activate
-network --hostname={{  hostvars[item]['inventory_hostname'] }}
+network --bootproto=static --device={{ network_interface }} --ip={{ hostvars[item]['ansible_host'] }} --gateway={{ ansible_default_ipv4.gateway }} --nameserver={{ dns_server }} --netmask={{ ansible_default_ipv4.netmask }} --ipv6=auto --activate
+network --hostname={{ hostvars[item]['inventory_hostname'] }}

metal/roles/pxe-boot/templates/tftp/tftpboot/grub.cfg.j2

@@ -1,5 +1,5 @@
 set timeout=5
 menuentry 'CentOS' {
-linuxefi vmlinuz ip=dhcp inst.repo=http://{{ pxe_server }}/CentOS ks=http://{{ pxe_server }}/kickstart/centos8.ks
+linuxefi vmlinuz ip=dhcp inst.repo=http://{{ ansible_default_ipv4.address }}/CentOS ks=http://{{ ansible_default_ipv4.address }}/kickstart/centos8.ks
   initrdefi initrd.img
 }