OpenStack is an open source cloud software which provides infrastructure-as-a-service (IaaS). It can be installed on single and multiple nodes.

In this article we will deploy openStack on three nodes ( compute + controller + network ) on CentOS 7.x using RDO repository and packstack utility. For Single Node OpenStack Installation refer the below :

How to Install Single Node OpenStack on CentOS 7

In article i am using three virtual machines hosted on VirtualBox and each VM has a single LAN interface. Below are architecture details :

Controller Node Details :

Hostname = controller.example.com

IP Address = 192.168.1.30

OS = CentOS 7.x

DNS = 192.168.1.11

Following OpenStack Components will installed on controller node :

Keystone Glance swift Cinder Horizon Neutron Nova novncproxy Novnc Nova api Nova Scheduler Nova-conductor

Compute Node Details :

Hostname = compute.example.com

IP Address = 192.168.1.31

OS = CentOS 7.X

DNS = 192.168.1.11

Following OpenStack Components will installed on compute node :

Nova Compute Neutron – Openvswitch Agent

Network Node Details :

Hostname = network.example.com

IP Address = 192.168.1.32

OS = CentOS 7.x

DNS = 192.168.1.11

Following OpenStack Components will installed on network node :

Neutron Server Neturon DHCP agent Neutron- Openswitch agent Neutron L3 agent

Perform the Following Steps for Installation :

Step:1 Update the nodes using below command.

Use the below command on all three nodes to update all installed packages.

# yum -y update ; reboot

Step:2 Update /etc/hosts file and Hostname

Set the hostname on all the three nodes using below command , in case it is not set.

# hostnamectl set-hostname 'new_hostname'

Update the /etc/hosts file if you don’t have your local DNS configured.

192.168.1.30 controller.example.com controller 192.168.1.31 compute.example.com compute 192.168.1.32 network.example.com network

Step:3 Disable SELinux and Network Manager on all three nodes.

Use below command to disable SELinux on all three nodes.

# setenforce 0

Disabled SELinux permanently by the changing the parameter ‘SELINUX=disabled’ in the file ‘/etc/sysconfig/selinux‘

Use below commands to disable Network Manager on all three nodes.

# systemctl stop NetworkManager # systemctl disable NetworkManager # reboot

Step:4 Set Passwordless authentication from Controller node to Compute & Network Node.

Run the below commands from Controller node.

Now check :

Step:5 Enable RDO repository and install packstack utility

Use below yum command to enable RDO repository and install packstack utility only on controller node.

Step:6 Generate and customize answer file

Use below command to generate answer file.

Edit the answer file and Specify the ip address of controller, compute and network node. Apart from this also specify the passwords of different services and disable the components like Demo version and Ceilometer.

[[email protected] ~]# vi /root/answer.txt ........................................ CONFIG_CONTROLLER_HOST=192.168.1.30 CONFIG_COMPUTE_HOSTS=192.168.1.31 CONFIG_NETWORK_HOSTS=192.168.1.32 CONFIG_PROVISION_DEMO=n CONFIG_CEILOMETER_INSTALL=n CONFIG_HORIZON_SSL=y CONFIG_NTP_SERVERS=<Specify NTP Server IP > CONFIG_KEYSTONE_ADMIN_PW=<Specify New_Password> ..........................................

Note : In case if you have don’t NTP server then you can leave NTP parameter as it is, but it is highly recommended that we should use ntp server for time syncing.

Step:7 Start Installation using packstack command.

Now we are good to start the openstack installation using packstack command. Run the below command from Controller node.

Once the installation is completed successfully we will get below:

After the installation, a new interface ‘br-ex‘ will created in the network node. Add network interface (enp0s3 or eth0 or may be other name ) to the Open vSwitch ‘br-ex’ bridge as a port and assign the ip address of ‘ enp0s3’ to ‘ br-ex’

Restart the Network service using below command.

Step:8 Access Openstack Dashboard.

Now try to access the openstack dashboard from the browser using below.

https://192.168.1.30/dashboard

Use user name as ‘admin’ and password that you specify in the answer.txt file.

Click on ‘Connect’

Note : In case you are getting ‘Error: Unable to retrieve volume limit information’ in the dashboard, this can be fixed by adding the following in the cinder.conf file on the controller node.

[[email protected] ~]# vi /etc/cinder/cinder.conf .................................... [keystone_authtoken] auth_uri = http://<Controller_IP>:5000 auth_url = http://<Controller_IP>:35357 auth_plugin = password project_domain_id = default user_domain_id = default project_name = services username = cinder password = <Cinder_Password> {Search CONFIG_CINDER_KS_PW in answer file} .....................................

Restart the Cinder Service.

As we are able to login in the dashboard, so we can say that Installation part is completed. Now the next task is to launch an instance, for that we need to perform following tasks .

Create Project and Users

Assign Users to the Project.

Create image and flavors

Define Internal and external network

Create Router

Create Security Rules for Virtual Machine or instance.

To accomplish above task refer the below URL :

Reference : – https://www.rdoproject.org/install/packstack/