1. Devstack beyond ‘hello-world’

2. Agenda
What is Devstack?
Single and multi node architecture
Cell architecture
Quick demo of cell setup

3. Run it
Test it
Mimic a
deploy
Why Devstack?

4. Structure
nova-db
glance-
db
img
store
volume
storage

5. Compute
Other componentsNova API
API request
Compute Compute`
Compute
Compute
Single node setup
Multi-node setup

6. A peek into stack.sh
ADMIN_PASSWORD=password
MYSQL_PASSWORD=stackdb
RABBIT_PASSWORD=stackqueue
SERVICE_PASSWORD=$ADMIN_PASSWORD
HOST_IP=w.x.y.z
...
localrc – set overrides
Database type
Enabled services=g-api,n-api,...
(Service repos)
NOVA_REPO=<nova git repo>
NOVA_BRANCH=<nova branch>
…
stackrc – primary config file

7. HOST_IP = <compute node IP>
MULTI_HOST=1
SERVICE_HOST=<controller IP>
MYSQL_HOST=<controller IP>
RABBIT_HOST=<controller IP>
ENABLED_SERVICES=n-cpu, n-net, c-sch, c-api, c-vol
On the compute node:
localrc settings
HOST_IP = <controller IP>
MULTI_HOST=1
ENABLED_SERVICES=n-net, n-api, c-sch, c-api, c-vol
On the controller node:

8. Work flow
API request

9. http://devstack.org/guides/multinode-lab.html

10. Cells

11. Nova-
cpu
Nova
-net DB
DB
Nova-
cpu
Nova
-net
Nova-
cell
Nova-
cell
Nova-
sch
Nova
-sch
Parent
Child
Grand-child

12. Parent-child structure

13. AMQP
Build Request
Parent
Child
Work flow

14. So, how we do we configure these cells in devstack?

15. Let’s try to configure a cell environment with one parent and one child

16. We used two VMs with Ubuntu 12.04 LTS installed as parent and child for this
demo

17. Clone https://github.com/matiu2/devstack on both parent and child and
checkout “cell_support” branch

18. Open localrc under devstack folder and type in
below content..
MULTI_HOST=True
enable_service n-cell n-api-meta
disable_service n-cpu
…
Open /etc/nova/nova.conf and type in below
content..
[cells]
enable=True
name=parent
cell_type=api
On Parent..
Run ./stack.sh
Restart n-api and n-cell services

19. On Child..
Open localrc under devstack folder and type in below
content..
MULTI_HOST=True
enable_service n-cell
disable_service n-api
Run ./stack.sh
Open /etc/nova/nova.conf and type in below
content..
[DEFAULT]
quota_driver=nova.quota.NoopQuotaDriver
glance_api_server = <glance server running in parent>
[cells]
enable=True
name=child
cell_type=compute
Restart n-cpu, n-sch and n-cell services

20. Now we are done configuring both parent and child…

21. How do the parent and the child know about each other now?

22. On parent, we will run the command:
nova-manage cell create --name=child --cell_type=compute --
username=guest --password=password --hostname=<child ip> --
port=5672 --virtual_host=/ --woffset=1.0 --wscale=1.0

23. On the child, we will run the command:
nova-manage cell create –name=parent --cell_type=api --
username=guest --password=password --hostname=<parent ip> --
port=5672 --virtual_host=/ --woffset=1.0 --wscale=1.0

24. Let’s try to build an instance in this cell environment…

26. http://openlystacking.blogspot.in/2013/07/creating-cell-environment-using-
devstack.html

27. So far, we have seen…
Brief introduction to devstack
Single and multi-node environment
Cells
A demo in a cell environment
Questions?