OpenStack Havana Installation on CentOS/RHEL

OpenStack Havana represents a significant milestone in open-source cloud computing. This comprehensive guide covers the installation and configuration of OpenStack Havana on CentOS/RHEL systems.

System Requirements

Hardware Requirements

• Controller Node: 2 CPU cores, 4GB RAM, 20GB storage
• Compute Nodes: 2 CPU cores, 4GB RAM, 20GB storage (per node)
• Network Node: 1 CPU core, 2GB RAM, 20GB storage

Software Prerequisites

• CentOS 6.4 or RHEL 6.4
• Network connectivity between all nodes
• NTP synchronization
• SELinux disabled or properly configured

Architecture Overview

Multi-Node Setup

Controller Node: nova-api, nova-scheduler, nova-conductor, glance, keystone, horizon
Network Node: neutron-server, neutron-dhcp-agent, neutron-l3-agent, neutron-metadata-agent
Compute Nodes: nova-compute, neutron-openvswitch-agent

Installation Steps

1. Environment Preparation

# Disable SELinux
setenforce 0
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config

# Configure NTP
yum install -y ntp
service ntpd start
chkconfig ntpd on

2. MySQL Database Setup

yum install -y mysql mysql-server
service mysqld start
chkconfig mysqld on

# Secure MySQL installation
mysql_secure_installation

3. Keystone Identity Service

# Install Keystone
yum install -y openstack-keystone python-keystoneclient

# Configure Keystone
openstack-config --set /etc/keystone/keystone.conf DEFAULT admin_token ADMIN_TOKEN
openstack-config --set /etc/keystone/keystone.conf database connection mysql://keystone:KEYSTONE_DBPASS@controller/keystone

4. Glance Image Service

# Install Glance
yum install -y openstack-glance python-glanceclient

# Configure Glance API
openstack-config --set /etc/glance/glance-api.conf database connection mysql://glance:GLANCE_DBPASS@controller/glance
openstack-config --set /etc/glance/glance-api.conf keystone_authtoken auth_uri http://controller:5000/v2.0

5. Nova Compute Service

# Install Nova components
yum install -y openstack-nova-api openstack-nova-cert openstack-nova-conductor openstack-nova-consoleauth openstack-nova-novncproxy openstack-nova-scheduler python-novaclient

# Configure Nova
openstack-config --set /etc/nova/nova.conf database connection mysql://nova:NOVA_DBPASS@controller/nova
openstack-config --set /etc/nova/nova.conf keystone_authtoken auth_uri http://controller:5000/v2.0

6. Neutron Networking

# Install Neutron server
yum install -y openstack-neutron openstack-neutron-ml2 python-neutronclient

# Configure Neutron
openstack-config --set /etc/neutron/neutron.conf database connection mysql://neutron:NEUTRON_DBPASS@controller/neutron
openstack-config --set /etc/neutron/neutron.conf keystone_authtoken auth_uri http://controller:5000/v2.0

Network Configuration

Provider Network Setup

# Create external network
neutron net-create ext-net --router:external True --provider:physical_network external --provider:network_type flat

# Create subnet
neutron subnet-create ext-net --name ext-subnet --allocation-pool start=START_IP,end=END_IP --disable-dhcp --gateway EXTERNAL_GATEWAY EXTERNAL_CIDR

Horizon Dashboard

# Install Horizon
yum install -y openstack-dashboard httpd mod_wsgi memcached python-memcached

# Configure Apache
sed -i "s/ALLOWED_HOSTS = \['horizon.example.com'\]/ALLOWED_HOSTS = ['*']/g" /etc/openstack-dashboard/local_settings

Verification

Launch an Instance

# Create tenant network
neutron net-create demo-net
neutron subnet-create demo-net --name demo-subnet --gateway 10.0.0.1 10.0.0.0/24

# Launch instance
nova boot --flavor m1.tiny --image cirros-0.3.4-x86_64 --nic net-id=$(neutron net-list | awk '/ demo-net / {print $2}') --security-group default --key-name mykey demo-instance

Troubleshooting

Common Issues

1. Service Startup Failures: Check log files in /var/log/
2. Database Connection Issues: Verify MySQL credentials
3. Network Connectivity: Ensure proper firewall rules
4. NTP Synchronization: Check time synchronization between nodes

Log Analysis

# Check service status
service openstack-keystone status
service openstack-glance-api status
service openstack-nova-api status

# View logs
tail -f /var/log/keystone/keystone.log
tail -f /var/log/nova/nova-api.log

Security Considerations

• Configure proper firewall rules
• Use secure passwords for service accounts
• Implement proper access controls
• Regular security updates
• Monitor system logs

Conclusion

OpenStack Havana provides a robust foundation for cloud infrastructure. Following this installation guide ensures a stable and functional OpenStack environment suitable for development and production workloads.

The multi-node architecture provides high availability and scalability, making it suitable for enterprise deployments.