1.
Xabier Arbulu Insausti
Software Engineer at
Suse
xarbulu@suse.com
Having fun with
openSUSE, Raspberries
and
HA cluster

2.
Let me present myself

3.
● From the Basque Country (Spain) but living in the Canary Islands.
● Studied computer science in the University of Basque Country (UPV).
● Working at Suse since last October in the
SLES4SAP and HA team as software engineer
(with Python, Salt and Terraform mainly).
● Hobbies: Surf, time in nature, friki things
(anime, videogames, etc) .

4.
How this project
started?

5.
Christmas dinner 2018...
My brother and I got a new job. Now he works in a
company that builds elevators. So as always:
My parents:
“Oh!! I see. And how fast they move?
How many people can use them?
Which material do you use?”

6.
So they talk about that until...
Dad: “Xabi, sorry, we could talk about what you do,
but,
you know...”
Me: “You don’t know what I do, right?
Mmm... you work with a computer, don’t you?

7.
So I decided to do
something to make
them understand
what I do!

8.
Let’s do something
cool!
Something visual!

9.
But not more SAP for this time,
please...

10.
Maybe out of budget...

11.
Let’s do a High Available webcams service! I can
use Motion for that.
Motion: https://motion-project.github.io/
So I decided to do something
simpler…

12.
And I started
working...

13.
“Oh man, and now I have to configure all the
raspberry pi-s…
And redo everything every time I fail… So
annoying”
“Dude! But you are working with Salt all the time!
Create some states to configure everything!
But...

14.
And finally the project was born!
https://github.com/arbulu89/ha-webcams-raspberry

15.
Who knows about HA
and Salt?

16.
Open Source High Availability
Cluster Stack
https://clusterlabs.org/
Old but Gold!!!

17.
Salt
https://docs.saltstack.com/en/latest/
https://github.com/saltstack/salt

18.
So, what’s the project
about?

19.
But let’s show the project using a
demo
What can go wrong?

20.
Let’s leverage Salt for everything!
● Configure the Salt Master using Salt
● Configure the nodes Salt Minion using salt (WTF!!)
– salt-ssh
● Configure HA and Motion using Salt

21.
Configure Salt Master
1. Install Salt Master
2. Auto accept Salt Minions connection
3. Install HA salt formula
https://github.com/arbulu89/ha-webcams-
raspberry/tree/master/salt/setup

22.
But… What is a salt formula?
Basically, a bunch of states
to configure certain
components (HA for
example).
IDEMPOTENCY ASSURED!

23.
HA salt formula
https://github.com/SUSE/habootstrap-formula
● Create the cluster
● Join to the cluster
● Configure resource
agents
● etc

24.
Configure the nodes with salt-ssh
We can use salt-ssh to run salt states in nodes
without salt-minion. Isn’t it great?!!!
We need to define a roster for that:

25.
And finally configure Motion and HA
Now we have everything ready, we only need run
Motion and HA cluster states. Easy!
High Available Cluster!!

26.
And what about HA?

27.
HA cluster will assure that there is
not downtime!
● What if the Motion daemon stops working?
– I will restart the daemon!
● What if the node crashes?
– I will migrate Motion daemon to the 2n node
● But the IP address to monitor the service will be
different!
– I will create a virtual address and migrate with Motion

28.
How are going to do that?
Simple! HA cluster monitors resources (instead of
machines).
We can monitor a systemd daemon for example.

29.
Disclaimer!!!
So, you will be thinking: “Hey! Why are you not just
using the 2 webcams together?!!”
Remember! This is just a demonstration to
show how to use Salt and HA in a more visual
way.

30.
So… Mom, Dad, do
you understand now
what I do?

31.
You do… webcams?
We will try other time again….

32.
Join Us at www.opensuse.org

33.
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Credits
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openSUSE Design Team
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