Openstack Deployment with Devstack

OpenStack is a free, open standard cloud computing platform that hat uses pooled virtual resources to build and manage private and public clouds. Here we will be deploying OpenStack with an Ubuntu server for Lab purposes. Openstack controls large pools of compute, storage, and networking resources, all managed through APIs or a dashboard. Beyond standard infrastructure-as-a-service functionality, additional components provide orchestration, fault management, and service management amongst other services to ensure high availability of user applications.

In this tutorial, we willl be using 2 VMs (1 cluster node and 1 compute nodes)

Configuring Cluster Node.
Install Ubuntu and update packages (Please take note of the network settings and compute IP Address).

Then install Missing Packages

apt-get install git openssh-server (use sudo if not logged in as root)

We will use git to pull Openstack packages the configure the openstack user account that can sudo without password Authentication.

groupadd stack

useradd -g stack -s /bin/bash -d /opt/stack -m stack

vi /etc/sudoers
then add 
%stack ALL=(ALL) NOPASSWD: ALL
set the stack user account passwd

passwd stack

Now log out and log in as the user stack to test.

Next step is to configure ssh keys. To be able to access other nodes remotelt without the need to log in or authentication.

mkdir ~/.ssh; chmod 700 ~/.ssh

Pull Openstack via git
git clone https://git.openstack.org/openstack-dev/devstack

Do the above steps on all cluster nodes also.
Next is to configure all cluster nodes local DNS settings by mapping the hostnames to the IP address on each server.

cd to the devstack director on the controller node

cd /opt/stack/devstack

and create the below files

touch local.conf 
touch stack.sh

vim stack.sh and add the line
for i in `seq 2 10`; do /opt/stack/nova/bin/nova-manage fixed reserve 10.0.0.$i; done

now execute the stack.sh script and wait

NOTE- this must be run as stack user and also change the owner of the devstack folder to the stack user

Got the error 'error cannot uninstall simplejson' during the instalation. To fix, do the following;
sudo apt purge python3-simplejson
pip install pyasn1-modules
Then execute the script again

Below is the Openstack login page

Now log in and access your dashboard

INSTALLING COMPUTE NODES

Now, OpenStack is installed, let’s configure and add compute nodes. Edit the following lines on the compute nodes x.

NOTE; You should have the stack user and openstack packages on the compute nodes before starting this process

cd /opt/stack/devstack

touch local.conf
nano local.conf

And set the following file as

[[local|localrc]]
HOST_IP=172.18.14.218 # change this per compute node
FLAT_INTERFACE=ens33
FIXED_RANGE=10.0.0.0/24
FIXED_NETWORK_SIZE=4096
FLOATING_RANGE=172.18.14.144/28
MULTI_HOST=1
LOGFILE=/opt/stack/logs/stack.sh.log
ADMIN_PASSWORD=redhat
DATABASE_PASSWORD=redhat
RABBIT_PASSWORD=redhat
SERVICE_PASSWORD=redhat
DATABASE_TYPE=mysql
SERVICE_HOST=172.18.14.219
MYSQL_HOST=$SERVICE_HOST
RABBIT_HOST=$SERVICE_HOST
GLANCE_HOSTPORT=$SERVICE_HOST:9292
ENABLED_SERVICES=n-cpu,n-net,n-api-meta,c-vol
NOVA_VNC_ENABLED=True
NOVNCPROXY_URL="http://$SERVICE_HOST:6080/vnc_auto.html"
VNCSERVER_LISTEN=$HOST_IP
VNCSERVER_PROXYCLIENT_ADDRESS=$VNCSERVER_LISTEN

Fill in your host and service IP address to match your servers.