Adding role for Supporting Linux OS installation

Role have been added to create, 1. Kickstart file - Drive the automated OS installation 2. DHCP setup - Add the lpar entry in DHCP config file inside DHCP server 3. TFTP setup - Add the tftp/grub related files for OS to be installed in accordence with lpar mac address 4. DHCP remove - cleanup the DHCP config for the lpar created Signed-off-by: Spoorthy S<[email protected]>
IBM · Jan 22, 2025 · 75f24ee · 75f24ee
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diff --git a/roles/linux_install/README.md b/roles/linux_install/README.md
@@ -0,0 +1,88 @@
+Role Name
+=========
+
+There are several ways to perform Linux OS installation on IBM Power servers. One of the methods is network-based install via tftpboot. This article explains how ansible can be used to automate this particular method of OS install.
+For the installation process, the following servers need to be setup:
+1. Http(Repo) server: It has the http service running. This server can be used as a dedicated
+server to have all the distro builds downloaded at one place and the required distro can
+be picked up from here during installation. If not, just having a server with the required
+distro build downloaded and accessible via http will suffice.
+2. DHCP - TFTP(pxe) server: It has the tftp and dhcpd service running
+3. Lpar – A logical partition on which we will be doing the installation
+	• When an installation is triggered, a kickstart file is generated on the HTTP server which contains
+	the configuration details of the required Linux OS installation. The HTTP server also contains the
+	various builds available.
+	• The boot files of the required OS are then downloaded on the DHCP-TFTP server. A grub config
+	file is also created on this server using the previously generated kickstart file.
+	• Next, the lpar_netboot command instructs the lpar to network boot, by having the partition
+	send out a bootp request to the DHCP-TFTP server to fetch the initial boot files. With this the
+	required OS is installed on the Lpar.
+
+Requirements
+------------
+
+PXE server up and running the dhcp and tftp services
+Repository server hosting the RHEL repositories  
+
+
+Role Variables
+--------------
+
+host_ip/host_gw/host_subnet/host_netmask: 
+	type: str
+	required: true
+	description: lpar Network details in format 9.9.9.9
+dns_ip: 
+	type: str
+	required: true
+	description: Nameserver IP details in format 9.1.1.1
+hostname: 
+	type: str
+	required: true
+	description: hostname of the lpar in format aaa.abc.com
+lpar_name: 
+	type: str
+	required: true
+	desription: name of lpar as in the HMC 
+hardware_ethernet: 
+	type: str
+	required: true
+	description: MAC address of the lpar in format ff:ff:ff:ff
+managed_system: 
+	type: str
+	required: true
+	description: system name in HMC in which lpar is available 
+
+Example Playbook
+----------------
+
+Including an example of how to use your role (for instance, with variables passed in as parameters) is always nice for users too:
+
+        ---
+        - name: Install linux
+          collections:
+            - ibm.power_hmc
+          gather_facts: false
+          roles:
+            - role: linux_install
+              vars:
+                host_ip: 9.9.9.9
+                host_gw: 9.9.9.1
+                host_subnet: 9.9.9.0
+                host_netmask: 255.255.255.0
+                dns_ip: 9.1.1.1
+                hostname: aaa.abc.com
+                lpar_name: name_in_hmc
+                hardware_ethernet: ff:ff:ff:ff
+                managed_system: system_name_in_HMC
+
+License
+-------
+
+GPL-3.0-only
+
+Author Information
+------------------
+
+Spoorthy S
+
diff --git a/roles/linux_install/meta/main.yml b/roles/linux_install/meta/main.yml
@@ -0,0 +1,12 @@
+galaxy_info:
+  author: Spoorthy S
+  description: Linux installation using pxe server
+  license: GPL-3.0-only
+  min_ansible_version: '>=2.14.0'
+  galaxy_tags:
+    - infrastructure
+    - ibm
+    - power
+    - hmc
+    - linux
+    - pxe
diff --git a/roles/linux_install/tasks/main.yml b/roles/linux_install/tasks/main.yml
@@ -0,0 +1,81 @@
+---
+
+- name: Create Kickstart file name
+  hosts: repo
+  set_fact:
+    ks_file: "{{ distro | regex_replace('\\.', '') }}_{{ hardware_ethernet }}.ks"
+
+- name: Create a kickstart file in Repository server
+  hosts: repo
+  template:
+    src: templates/ks.j2
+    dest: "/var/www/html/linux_ks/{{ ks_file }}"
+
+- name: Remove any existing tftp boot folder in PXE server for this VM
+  shell: rm -rf {{ dest_dir }}
+
+- name: Calculate cutdir value
+  shell: echo "{{ hostvars['repo']['repo_dir'] }}" | tr '/' '\n' | grep -v "^$" | wc -l
+  register: cut_dir
+
+- name: Download files from /boot and /ppc directory in Repository Server to the PXE server tftp path(hardware address)
+  hosts: pxe
+  shell: wget -r --reject="index.html*" --no-parent -nH --cut-dir={{ cut_dir.stdout | int + 1 }}   http://{{ hostvars['repo'].ansible_host }}:{{ repo_port }}/{{ hostvars['repo']['repo_dir'] }}/boot/ -P {{ dest_dir }}  
+  shell: wget -r --reject="index.html*" --no-parent -nH --cut-dir={{ cut_dir.stdout | int + 1 }}   http://{{ hostvars['repo'].ansible_host }}:{{ repo_port }}/{{ hostvars['repo']['repo_dir'] }}/ppc/ -P {{ dest_dir }}
+
+- name: Create netboot directory in PXE server under tftp path
+  hosts: pxe
+  shell: grub2-mknetdir --net-directory={{ base_dir }} --subdir={{ mac_address }}/boot/grub/
+
+- name: Create grub.cfg and copy to boot directory in PXE server 
+  hosts: pxe
+  template:
+    src: templates/grub_conf.j2
+    dest: "{{ dest_dir }}/boot/grub/grub.cfg"
+  shell: cp "{{ dest_dir }}/boot/grub/grub.cfg" "{{ dest_dir }}/boot/grub/powerpc-ieee1275/grub.cfg-01-{{ address }}"
+
+- name: Edit dhcpd.conf with the entry for the target VM and start the DHCP service
+  hosts: pxe
+  shell: cp /etc/dhcp/dhcpd.conf /tmp/dhcpd.conf
+  blockinfile:
+    dest: /etc/dhcp/dhcpd.conf
+    marker: "#{mark} Ansible module dhcp entry"
+    block: "{{ lookup('template', 'dhcpd_conf.j2') }}"
+    state: present
+  shell: systemctl restart  dhcpd.service
+
+- name: Lparnetboot operation on target lpar
+  hosts: hmcs
+  connection: local
+  collections:
+      - ibm.power_hmc
+  powervm_lpar_instance:
+        hmc_host: "{{ hmc_host }}"
+        hmc_auth: "{{ curr_hmc_auth }}"
+        system_name: "{{ managed_system }}"
+        vm_name: "{{ lpar_name }}"
+        install_settings:
+          vm_ip: "{{ host_ip }}"
+          nim_ip: "{{ hostvars['pxe'].ansible_host }}"
+          nim_gateway: "{{ host_gw }}"
+          nim_subnetmask: "{{ host_netmask }}"
+          vm_mac: "{{ hostvars['pxe']['mac_address'] }}"
+          timeout: 20
+        action: install_os
+
+- name: Revert the DHCP configuration changes in PXE server
+  hosts: pxe
+  shell: cp /etc/dhcp/dhcpd.conf /tmp/dhcpd.conf
+  blockinfile:
+    dest: /etc/dhcp/dhcpd.conf
+    marker: "#{mark} Ansible module dhcp entry"
+    block: "{{ lookup('template', 'dhcpd_conf.j2') }}"
+    state: absent
+  shell: systemctl restart  dhcpd.service
+
+
+
+
+
+
+
diff --git a/roles/linux_install/templates/dhcpd_conf.j2 b/roles/linux_install/templates/dhcpd_conf.j2
@@ -0,0 +1,15 @@
+subnet {{ host_subnet }} netmask {{ host_netmask }} {
+    allow bootp;
+    option routers {{ host_gw }};
+    option domain-name-servers {{ dns_ip }};
+    option domain-name "aus.stglabs.ibm.com";
+    group {
+        next-server {{ hostvars['pxe'].ansible_host }};
+        filename "{{ core_file_path }}";
+              host {{ hostname }} {
+                        hardware ethernet {{ hardware_ethernet }};
+                        fixed-address {{ host_ip }};
+            option tftp-server-name "{{ hostvars['pxe'].ansible_host }}";
+        }
+    }
+}
diff --git a/roles/linux_install/templates/grub_conf.j2 b/roles/linux_install/templates/grub_conf.j2
@@ -0,0 +1,9 @@
+set timeout=1
+menuentry 'Install OS' {
+    insmod http
+    insmod tftp
+    set root=tftp,{{ hostvars['pxe'].ansible_host }}
+    echo 'Loading OS Install kernel ...'
+    linux {{ mac_address }}/ppc/ppc64/vmlinuz ifname=net0:{{ hardware_ethernet }} ip={{ host_ip }}::{{ host_gw }}:{{ host_netmask }}:{{ hostname }}:net0:none nameserver={{ dns_ip }} inst.repo=http://{{ hostvars['repo'].ansible_host }}:{{ repo_port }}{{ hostvars['repo']['repo_dir'] }} inst.ks=http://{{ hostvars['repo'].ansible_host }}:{{ repo_port }}/linux_ks/{{ hostvars['repo']['ks_file'] }}
+    initrd {{ mac_address }}/ppc/ppc64/initrd.img
+}
diff --git a/roles/linux_install/templates/ks.j2 b/roles/linux_install/templates/ks.j2
@@ -0,0 +1,51 @@
+# Use text mode install
+text
+# Reboot after installation
+reboot
+
+%post
+sed -i 's/#\?PermitRootLogin.*/PermitRootLogin yes/g' /etc/ssh/sshd_config;service sshd restart;multipath -t >/etc/multipath.conf;service multipathd start
+%end
+
+%addon com_redhat_kdump --enable --reserve-mb='auto'
+
+%end
+
+# Keyboard layouts
+keyboard --vckeymap=us --xlayouts='us'
+# System language
+lang en_US.UTF-8
+
+# Network information
+network  --hostname="{{ hostname }}"
+
+# Use network installation
+url --url="http://{{ hostvars['repo'].ansible_host }}:{{ repo_port }}{{ repo_dir }}/BaseOS"
+
+%packages
+@core
+device-mapper-multipath
+kexec-tools
+
+%end
+
+# System services
+services --enabled="NetworkManager,sshd"
+# Do not configure the X Window System
+skipx
+
+# Clear the Master Boot Record
+zerombr
+# Partition clearing information
+clearpart --all --initlabel --drives=sda
+# System bootloader configuration
+bootloader --append="crashkernel=2G-4G:384M,4G-16G:512M,16G-64G:1G,64G-128G:2G,128G-:4G" --location=mbr --boot-drive=sda
+autopart --fstype=ext4
+# Generated using Blivet version 3.6.0
+ignoredisk --only-use=sda
+
+# System timezone
+timezone Asia/Kolkata --utc
+
+# Root password
+rootpw --plaintext password
diff --git a/roles/linux_install/vars/main.yml b/roles/linux_install/vars/main.yml
@@ -0,0 +1,58 @@
+---
+
+# Redhat Release Name
+distro: 9.1le
+
+# Repository Port Number 
+repo_port: 81
+
+# Path to the build files in Repository server
+repo_dir: "/crtl/repo/rhel/{{ distro }}/nightly"
+
+# Tftp boot directory path in PXE server
+base_dir: /var/lib/tftpboot/
+
+# Remove ':' in hardware ethernet address
+mac_address: "{{ hardware_ethernet | regex_replace(':', '') }}"
+
+# Append base directory path with a new directory named by mac address
+dest_dir: "{{ base_dir }}{{ mac_address }}"
+
+# Set core elf file path in PXE server
+core_file_path: "{{ mac_address }}/boot/grub/powerpc-ieee1275/core.elf"
+
+# Replace ':' in hardware ethernet address wit '-'
+address: "{{ hardware_ethernet | regex_replace(':', '-') }}"
+
+# HMC credentials
+curr_hmc_auth:
+	username: abc
+        password: def
+
+# PXE server credentials
+pxe:
+	ansible_host: abc.com
+	ansible_user: host
+	ansible_password: password
+
+#Repo server credntial
+repo:
+	ansible_host: abc.com
+        ansible_user: host
+        ansible_password: password
+
+# Host Details
+host_ip: 9.9.9.9
+host_gw: 9.9.9.1
+host_subnet: 9.9.9.0
+host_netmask: 255.255.255.0
+dns_ip: 9.1.1.1
+hostname: aaa.abc.com
+lpar_name: name_in_hmc
+hardware_ethernet: ff:ff:ff:ff 
+managed_system: system_name_in_HMC
+
+
+
+
+