Thing which seemed very Thingish inside you is quite different when it gets out into the open and has other people looking at it

Sunday, April 28, 2013

Kick start on Openstack with Devstack {Folsom}

Recently I was told to install openstack controller-compute node set ... and my first impression on it was piece of cake!! because you get couple of scripts and all you need to just run the script.. !! I WAS SOO WRONG!! yes it is just couple of script but you need to know how things work and there are soo many places where it can totally messed up your machine and your set up. Meaning you can easily get messed up!!! If you don't go in the right path it will take ages .. and you might even have to format your machine several times to get things clean and start all over again which is very time consuming.. So I ended up installing openstack for almost a week spending day and night on my precious development time!!!


So I decided to write a post on focusing on HOW TO INSTALL OPENSTACK? So other people want do the same mistake I did or take ages to get things done. If you know what you are doing then installing devstack only take one hour's time all you need to do is make your configuration right and run the scrip!!!


So before we begin I would like to give a small introduction to OpenStack to make things more clearer.

What is OpenStack ?

In simple terms OpenStack is an opensource cloud operating system ... It is like the fabric of the cloud. OpenStack was initially founded by rackspace and NASA in 2010 and its being growing ever since. The best way to get what OpenStack is by reading their mission which is very simple and direct

"To produce the ubiquitous Open Source Cloud Computing platform that will meet the needs of public and private clouds regardless of size, by being simple to implement and massively scalable."

OpenStack is written in purely written in python, true it use other systems like MYSQL and rabbitMQ but the core is written in python which makes things very efficient and fast. And also initially it had two main component 1) Nova - which is the compute side of it and the other one 2) swift - the data storage side of it.

Current OpenStack stable version {Folsom} have few core components


  • Openstack object storage (swift)
  • OpenStack image registry and delivery (Glance)
  • Openstack compute (nova)
  • Horizon (web UI)
  • Keystone (authentication)
  • Quantum/Melange (Network)


In future OpenStack is going to provide other compoents such Cellometer (Billing service), Cinder (block storage) and load balancer services. So that's enough about OpenStack lets see how we can install it. I will be installing OpenStack using devstack..

What is devstack ?


Well devstack is openstack development project (there are quite a few :) ) but I think devstack is the easiest :).  Devstack provides a documented shell script (which is written in bash) to build a complete OpenStack development environments. Originally created by Rackspace now maintained by OpenStack community. This supports both ubuntu and fedora (but today we will be focusing how we can install openstack in ubuntu 12.04).

Installing OpenStack  

In this installation I will be explaining how we can install OpenStack in Multi-Node environment.

Prerequisites 

Install ubuntu 12.04 and

Install git
     apt-get install -y git sudo

Network setting on each node

    You need to have a stack ip and also decide on what your Floating IP range (public IP range ) and Fixed IP range (private IP range) are.

This is my network configurations

  Static IP (controller ) - 10.100.0.30
  Floating (Public) IP range - 10.100.0.128/25
  Fixed (Private) IP range  - 192.168.16.0/25 

Go to /etc/network/interfaces and configure your network accordingly.

Controller node 

auto eth0
iface eth0 inet static
address 10.100.0.30
netmask 255.255.252.0
gateway 10.100.1.254

Compute Node

auto eth0
iface eth0 inet static
address 10.100.0.29
netmask 255.255.252.0
gateway 10.100.1.254



Before we begin we need to create  separate user to do things in a cleaner way.


groupadd stack
useradd -g stack -s /bin/bash -d /opt/stack -m stack
echo "stack ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers

From here onward we will be doing all the operation from the stack user.

Once you create the user log out and login from the the stack user and download openstack using git. When you are downloading make sure you download the stable version (in my case its folsom) so you will not have any surprises. :)


sudo su stack # login from the user
cd # go to user home
git clone git://github.com/openstack-dev/devstack.git -b stable/folsom #download devstack stable version

Once you download devstack other things are pretty straight foward. Go to devstack folder and create localrc  file and add the configuration accordingly in each node.

Configuring and Installing OpenStack in Controller Node


vi localrc

HOST_IP=10.100.0.30
FLAT_INTERFACE=eth0
FIXED_RANGE=192.168.16.0/25 
FIXED_NETWORK_SIZE=126
FLOATING_RANGE=10.100.0.128/25
MULTI_HOST=1
LOGFILE=/opt/stack/logs/stack.sh.log
ADMIN_PASSWORD=openstack
MYSQL_PASSWORD=root
RABBIT_PASSWORD=rabbitmq
SERVICE_PASSWORD=password
SERVICE_TOKEN=poohdedoo

Once you create the file you can run the setup script using the following command.

./stack.sh

After a successful  installation you will get the following output


Horizon is now available at http://10.100.0.30/
Keystone is serving at http://10.100.0.30:5000/v2.0/
Examples on using novaclient command line is in exercise.sh
The default users are: admin and demo
The password: openstack
This is your host ip: 10.100.0.30
stack.sh completed in 3443 seconds.


Configuring and Installing OpenStack in Compute Node


Just like the controller node you need to have the basic infrastructure in order to install the computer. Only change is there is the content of the localrc file in the compute node.


vi localrc

SERVICE_HOST=10.100.0.30
HOST_IP=10.100.0.29
FLAT_INTERFACE=eth0
FIXED_RANGE=192.168.16.0/25 
FIXED_NETWORK_SIZE=126
FLOATING_RANGE=10.100.0.128/25
MULTI_HOST=1
LOGFILE=/opt/stack/logs/stack.sh.log
ADMIN_PASSWORD=openstack
MYSQL_PASSWORD=root
RABBIT_PASSWORD=rabbitmq
SERVICE_PASSWORD=password
SERVICE_TOKEN=poohdedoo
MYSQL_HOST=$SERVICE_HOST
RABBIT_HOST=$SERVICE_HOST
GLANCE_HOSTPORT=$SERVICE_HOST:9292
Q_HOST=$SERVICE_HOST
ENABLED_SERVICES=n-cpu,n-net,n-api,c-sch,c-api,c-vol,rabbit


That's it !!. Just like the controller node you need to run the setup script to execute the installation.

./stack.sh

Once you successfully install openstack in both nodes you can login to openstack using the horizon dashboard

 http://10.100.0.30/ and login according to the user credentials you have provided in your setup configuration.


You can run the exercise.sh run provided by devstack in order to test your set up which includes uploading/launching instances and creating user groups/keypairs and user rules. 

If you want to upload images manually using the script you can use the following commands

glance image-create --name mysql-cartridge-amd64  --is-public true --container-format ami --disk-format ami < /home/wso2/wso2s2-openstack-1.0.0/cartridges/mysql-cartridge-amd64.img

To see what you have uploaded 

source openrc demo demo
glance image-list

You can also see these images using the horizon dashboard and further do task like launching the instances, assigning public IPs create key pairs and assign rules to security groups ect. I am not going to details since its a very straight forward dashboard and you can easily do everything by following the dashboard.



But I would like to proudly attach my openstack dashboad :) for references sake :)
On a final note restarting openstack is pretty tricky however, you can use the devstack script to restart openstack.

Restarting OpenStack using Devstack

Run the following in order to own the shell


script /dev/null 

And execute the following script
./rejoin-stack.sh

inside devstack folder in order to restart openStack.

To get out of the screen use ctrl-a , ctrl-d

Thats it folks !!
Once you set it up its like having a data center in your basement you can test load balancers and you can do all those caching stuff and experiment new stuff its really a cool thing to have. All the things you do which was in a private cloud and you can point it to a public cloud very easily!!!

3 comments:

  1. Dumb question: How many physical computers did you use to accomplish this tutorial?
    Cheers,
    Dave

    ReplyDelete
  2. Hi Dave,

    I used three physical computers for this tutorial, 1- Controller node and 2- Compute node

    Thanks,
    Amani

    ReplyDelete
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