install and setup openstack on controller and compute nodes ( AI Generated Article)

Setting up OpenStack involves configuring at least two nodes: a Controller Node and a Compute Node. Below is a step-by-step guide to install and configure OpenStack using the OpenStack Ussuri or a later release. This guide assumes you're using a Linux distribution like Ubuntu 20.04 or CentOS 8.


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Prerequisites

1. Hardware Requirements:

Controller Node: Minimum 4 CPUs, 8 GB RAM, 100 GB storage.

Compute Node: Minimum 4 CPUs, 8 GB RAM, 100 GB storage.



2. Network Configuration:

Assign static IPs to both nodes.

Configure a management network accessible by both nodes.



3. Dependencies:

Ensure both nodes have NTP installed for time synchronization.

Disable firewalld, SELinux (CentOS), or AppArmor (Ubuntu).


# Disable SELinux (CentOS)
setenforce 0
sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config


4. OpenStack Repository: Add the OpenStack repository to your system.

# Ubuntu
sudo add-apt-repository cloud-archive:ussuri
sudo apt update && sudo apt upgrade

# CentOS
sudo dnf install -y centos-release-openstack-ussuri
sudo dnf update -y




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1. Install OpenStack Packages

Controller Node

1. Install MySQL, RabbitMQ, and Memcached for database, message queue, and caching:

sudo apt install -y mariadb-server python3-pymysql rabbitmq-server memcached python3-memcache


2. Configure the database:

sudo mysql_secure_installation
sudo mysql
CREATE DATABASE keystone;
GRANT ALL PRIVILEGES ON keystone.* TO 'keystone'@'localhost' IDENTIFIED BY 'PASSWORD';
FLUSH PRIVILEGES;


3. Install and configure Identity service (Keystone):

sudo apt install -y keystone apache2 libapache2-mod-wsgi-py3

Edit /etc/keystone/keystone.conf and set:

[database]
connection = mysql+pymysql://keystone:PASSWORD@localhost/keystone

Populate the database and restart services:

sudo keystone-manage db_sync
sudo systemctl restart apache2


4. Install and configure other services (e.g., Glance, Nova, Neutron) based on your requirements.




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Compute Node

1. Install Nova Compute service:

sudo apt install -y nova-compute


2. Configure /etc/nova/nova.conf:

[DEFAULT]
transport_url = rabbit://openstack:RABBIT_PASS@CONTROLLER_IP
auth_strategy = keystone
my_ip = COMPUTE_NODE_IP


3. Restart Nova Compute:

sudo systemctl restart nova-compute




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2. Configure Networking

1. Install Neutron on the Controller:

sudo apt install -y neutron-server neutron-plugin-ml2 neutron-linuxbridge-agent


2. Configure the /etc/neutron/neutron.conf file and the ml2_conf.ini file for your network setup.


3. On the Compute node, configure the Linux bridge or OVS agent as per your network configuration.




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3. Verify Installation

1. Source the admin credentials:

source /etc/keystone/admin-openrc.sh


2. Verify services:

openstack service list


3. Add a test instance to confirm that your setup is functioning correctly.




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Notes:

Automation: Use tools like DevStack, Packstack, or Terraform to simplify installation.

Documentation: Refer to the OpenStack Installation Guide for detailed configuration options.


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