Installing OpenStack on Multi-node in CentOS 7, Red Hat or Fedora Linux

This guide will walk you through the steps to install openstack on three different nodes in CentOS 7. As we have already covered single node installation in Red Hat, CentOS and Fedora linux in my previous article you might be interested in reading.

Controller Node:

# yum -y update ; reboot

STEP2 - Updating  /etc/hosts File

# hostnamectl set-hostname controller

# hostnamectl set-hostname compute

# hostnamectl set-hostname network

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

STEP3 - Disabling SELinux and Network Manager on All Three Nodes

# setenforce 0

# systemctl stop NetworkManager
# systemctl disable NetworkManager
# reboot

[root@controller ~]# ssh-keygen
[root@controller ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.1.31
[root@controller ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.1.32

[root@controller ~]# ssh compute 
Last login: Sun Apr 3 00:03:44 2016 from controller.example.com
[root@compute ~]# hostname
compute.example.com
[root@compute ~]#

[root@controller ~]# ssh network
Last login: Sun Apr 3 00:04:20 2016 from controller.example.com
[root@network ~]# hostname
network.example.com
[root@network ~]#

STEP5 - Enable RDO Repository and installing packstack

[root@controller ~]# yum install -y https://www.rdoproject.org/repos/rdo-release.rpm
[root@controller ~]# yum install -y openstack-packstack

STEP6 - Generate and Customize Answer File

[root@controller ~]# packstack --gen-answer-file=/root/answer.txt
[root@controller ~]#

[root@controller ~]# 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=
CONFIG_KEYSTONE_ADMIN_PW=
..........................................

STEP7 - Installing OpenStack

[root@controller ~]# packstack --answer-file=/root/answer.txt

[root@network ~]# cd /etc/sysconfig/network-scripts/
[root@network network-scripts]# cp ifcfg-enp0s3 ifcfg-br-ex
[root@network network-scripts]# vi ifcfg-enp0s3
DEVICE=enp0s3
HWADDR=08:00:27:37:4C:EF
TYPE=OVSPort
DEVICETYPE=ovs
OVS_BRIDGE=br-ex
ONBOOT=yes

[root@network network-scripts]# vi ifcfg-br-ex
DEVICE=br-ex
DEVICETYPE=ovs
TYPE=OVSBridge
BOOTPROTO=static
IPADDR=192.168.1.32
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
DNS1=192.168.1.11
ONBOOT=yes

[root@network network-scripts]# systemctl restart network
[root@network network-scripts]#

STEP8 - Accessing Openstack Web-interface Dashboard.

[root@controller ~]# vi /etc/cinder/cinder.conf
....................................
[keystone_authtoken]
auth_uri = http://:5000
auth_url = http://:35357
auth_plugin = password
project_domain_id = default 
user_domain_id = default 
project_name = services 
username = cinder 
password =  {Search CONFIG_CINDER_KS_PW in answer file}
.....................................

[root@controller ~]# systemctl restart  openstack-cinder-api.service
[root@controller ~]# systemctl restart  openstack-cinder-backup.service
[root@controller ~]# systemctl restart  openstack-cinder-scheduler.service
[root@controller ~]# systemctl restart  openstack-cinder-volume.service

• 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.

STEP9 - Create a Project and add a member to the Project

Login to the dashboard using Admin credentials and navigate to Identity Tab > Projects and Click on Create Project.

Click on “Create Project”

To create Users , Go to Identify Tab > Users > Click on ‘Create User’

Provide the information according to your environment.

Create a flavor and image :

To create a flavor login in dashboard using admin credentials , navigate to Admin Tab > Flavors > Click on create Flavor.

Specify the Flavor Name (fedora.small) , VCPU , Root Disk , Ephemeral Disk & Swap disk.

To Create Image , Go to Admin Tab > Images > Click on Create Image.

Specify the Image Name , Description, Image Soure ( in my case i am using Image File as i have already downloaded the Fedora 23 Cloud Image ) , Format QCOW2

Create Network and Router for Project Innovation.

To create Network and router for Innovation project sign out of admin user and login with the new user you have created in dashboard.

Go to the Network Tab > Click on Networks > then Click on Create Network

Specify the Network Name as Internal

Click on Next..

Specify the Subnet name (sub-internal) and Network Address (10.10.0.0/24)

Click on Next.

VMs will be getting internal ip from DHCP Server because we enabled DHCP option for internal network.

Now Create External Network . Click on “Create Network” again , Specify Network Name as “external”

Click on Next.

Specify subnet Name as “sub-external” and Network Address as “192.168.1.0/24”

Click on Next

Uncheck  “Enable DHCP” option and Specify the ip address pool for external network.

Click on Create.

Now time to create a Router.

Go To Network Tab > Routers > Click on ‘+ Create Router’

Now Mark External network as “External” , this task can be completed only from admin user , so logout from the normal user and login as admin.

Go to Admin Tab > Networks > Click on Edit Network for “External”

Click on Save Changes

Now Logout from admin user and login as normal user your have created earlier

Go to Network Tab > Routers > for Router1 click on “Set Gateway”

Click on “Set Gateway” , this will add a interface on router and will assign the first ip of external subnet (192.168.1.0/24).

Add internal interface to router as well , Click on the “router1″ and select on “interfaces” and then click on “Add interface”

Click on Add interface.

Network Part is completed. Now we can view Network Topology from “Network Topology” Tab

Now Create a key pair that will be used for accessing the VM and define the Security firewall rules.

For creating a key pair

Navigate to ‘Access & Security’  Tab > Click on Key Pairs > then click on ‘Create Key Pair‘

It will create a Key pair with name “myssh-keys.pem”

Add a new Security Group with name ‘fedora-rules’ from Access & Security Tab. Allow 22 and ICMP from Internet ( 0.0.0.0 ).

Once the Security Group ‘fedora-rules’ created , click on Manage Rules and allow 22 & ICMP ping.

Click on Add , Similarly add a rule for ICMP.

STEP10 - Launching an instance.

Navigate to Compute Tab > Click on Instances > then click on ‘Launch Instance’

Specify the Instance Name , Flavor that we created in above steps and ‘Boot from image’ from Instance Boot Source option and Select Image Name ‘fedora-image’.

Click on ‘Access & Security’ and Select the Security Group ‘fedora-rules’ & Key Pair ”myssh-keys‘

Now Select Networking and add ‘Internal’ Network and the Click on Launch 

Once the VM is launched , Associate a floating ip so that we can access the VM.

Click on ‘Associate Floating IP‘

Click on Allocate IP.

Click on Associate

Now try to access the VM with floating IP ( 192.168.1.20) using keys.

As you can see above that we are able to access the VM using keys. Our task of launching a VM from Dashboard is Completed Now.

I hope this guide was helpful to install openstack on multi-node in your environment.