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HOW TO BUILD RHEL IMAGES FOR EDGE DEPLOYMENTS
By Chris Santiago|Published Thu, 20 Apr 2023 07:00:00 +0000
As edge infrastructure scales outside the data center into remote locations,
small-factor devices such as IoT, POS, and sensors that have Linux images, need
a way to be updated at scale.
The rpm-ostree core premise is that by default, the updates should base on a
whole base image that is created and tested offline, and once ready deployed
everywhere into the remote locations, overriding the previous image and lowering
the risks of patching at scale.
Figure 1: The image builder.
We know many people are working in secure edge environments and need the ability
to create and lifecycle manage operating systems. In order to help with this we
have created a way to build, host and manage these images using the Red Hat
Ansible Automation Platform.
This article will cover the Ansible collection for management of the osbuild
composer to build rpm-ostree based images for Fedora, Red Hat Enterprise Linux,
and CentOS Stream. This collection has roles to build an osbuild server, an
apache httpd server to host images, and a role to build installer images and
rpm-ostree updates.
2 ROLES OF THE INFRA.OSBUILD COLLECTION
There are two roles that are part of the infra.osbuild collection:
1. THE INFRA.OSBUILD.SETUP_SERVER ROLE
The setup_server role checks to see what type of OS the remote system is
running, ostree-based or non ostree-based. A remote system running an OS based
on ostree will need to have packages already installed via a previous commit or
with the initial install to continue. Non-ostree based hosts will have all the
necessary packages installed.
At the same time the setup_server role also ensures all necessary services are
enabled and started. Lastly it adds support for rpm custom repositories for
adding custom packages to images.
2. THE INFRA.OSBUILD.BUILDER ROLE
This builder role creates a blueprint based on information provided by the
playbook variables such as packages, user info, and compose type. A rpm-ostree
repository is initialized for the blueprint name to handle commits and upgrades.
The builder role creates an image based on the previously created blueprint.
Lastly it creates a kickstart file which supports an optional auto registration
to be used on a system.
HOW TO BUILD IMAGES FOR EDGE DEPLOYMENT
Note: To test this collection you will need either a RHEL, CentOS Stream, or
Fedora system.
Install the infra.osbuild collection using the ansible-galaxy command as
follows:
ansible-galaxy collection install git+https://github.com/redhat-cop/infra.osbuild
Once installed we will make an empty directory to store the example playbooks
and inventory file.
mkdir osbuild_example
Create an inventory file as follows:
touch inventory.ini
Inside the inventory file, create a group named all with the remote systems IP
address underneath.
[all]
Now that we have an inventory file and a remote system to point to. Let’s take a
look into the setup_role. As explained above, this role simply sets up all the
necessary packages and services to get osbuild up and running. If you plan on
using a custom rpm repository to add custom packages that you would like to make
available to osbuild then we need to add some configuration otherwise we can use
the role as is.
Create a playbook named osbuild_setup_server.yaml with the sample playbook as
its contents as follows:
---
- name: Run osbuild_server role
hosts: all
become: true
tasks:
- name: Run the role
ansible.builtin.import_role:
name: infra.osbuild.setup_server
For adding a custom rpm repository, we can pass a list to the
setup_server_custom_repos role variable. Each list entry is a YAML dictionary
type and has the following attributes:
* repo_name
* base_url
* type
* check_ssl
* check_gpg
* rhsm
* state
If you wanted support for custom rpm repositories your playbook should something
like the following:
---
- name: Run osbuild_server role
hosts: all
become: true
vars:
setup_server_custom_repos:
- name: EPEL Everything
base_url: "https://dl.fedoraproject.org/pub/epel/{{ hostvars[inventory_hostname].ansible_distribution_major_version }}/Everything/x86_64/"
type: yum-baseurl
check_ssl: true
check_gpg: true
state: present
- name: My company custom repo
base_url: "https://repo.example.com/company_repo/x86_64/"
type: yum-baseurl
tasks:
- name: Run the role
ansible.builtin.import_role:
name: infra.osbuild.setup_server
Now that we have the osbuild_setup_server file completed, we can run the
playbook using this command:
ansible-playbook -i inventory.ini –ask-become –ask-pass playbooks/osbuild_setup_server.yaml
Note: We will run the playbook with –ask-become and –ask-pass flags to provide
basic authentication, or if you want to set up proper authentication with ssh
keys and proper user sudo management.
Once the playbook has finished running then the osbuild server is ready for us
to start building images.
As explained in the infra.osbuild.builder section, there are variables that are
needed to create a blueprint. You can refer to the full list and their
explanations.
Let’s create another playbook called osbuild_builder.yaml with the sample
playbook as its contents as follows:
---
- name: Run osbuild_builder role
become: true
hosts: all
vars:
builder_compose_type: edge-commit
builder_blueprint_name: mybuild
builder_pub_key: ~/.ssh/id_rsa.pub
builder_compose_pkgs:
- vim-enhanced
- httpd
- ansible-core
- tmux
builder_compose_customizations:
user:
name: "testuser"
description: "test user"
password: "testpassword"
key: "{{ builder_pub_key }}"
groups: '["users", "wheel"]'
tasks:
- name: Run the role
ansible.builtin.import_role:
name: infra.osbuild.builder
If you would like to have your image automatically register with Ansible
Automation Platform, add builder_aap_url, builder_set_hostname,
builder_aap_ks_user and builder_aap_ks_password underneath the vars section in
the osbuild_builder.yaml playbook.
Once you have finished writing your playbook run the osbuild_builder.yml
playbook to begin building an image.
ansible-playbook -i inventory.ini –ask-become –ask-pass playbooks/osbuild_builder.yml
After the playbook finishes, log in into your remote system http://// to see the
hosted repo and kickstart file that can be used to provision a new system.
FIND MORE RESOURCES
In summary, infra.osbuild is an easy-to-use solution for creating customizable
images. Ansible validated content for infrastructure osbuild collection, will
let you automate the provisioning and configuration of the required osbuild
components and build a RHEL image for your edge deployments.
If you want to learn more about edge automation, here are a few suggestions:
* Explore resources at Using Red Hat Ansible Automation Platform for edge
computing.
* Download the Automation at the edge e-book.
* For additional use cases such as industrial protocol integration, read the
article, How to automate devices using the Ansible CIP collection.
The post How to build RHEL images for edge deployments appeared first on Red Hat
Developer.
Read the articleView more blog posts
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Timestamp: Wed Apr 19 16:23:33 UTC 2023SHA: headVersion: 1.198
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