# Pouta ### Pouta fundamentals

# What is Pouta?
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- General purpose Infrastructure as a Service (IaaS)
                        - Based on OpenStack
                        - ISO 27001 certified
                        - In production since 2013
                        - Data located in Kajaani, Finland
                        - Publicly accessible over the internet

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                            <img src="/img/sld-pouta-image24.png" alt="Map of Finland with the data centre in Kajaani marked.">
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                        # XaaS
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- The service provider manages the lower layers
                        - You manage the layers above
                        - cPouta gives you an operating system and everything above it

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                                <img src="/img/sld-pouta-image26.svg" alt="Responsibility layers for IaaS, PaaS and SaaS.">
                                <figcaption>IaaS vs PaaS vs SaaS responsibilities</figcaption>
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                        # IaaS example providers
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- CSC cPouta and ePouta
                        - Alibaba Cloud Elastic Compute Service (ECS)
                        - Amazon Web Services (AWS) EC2
                        - DigitalOcean Droplets
                        - Google Compute Engine (GCE)
                        - Hetzner Cloud Servers
                        - IBM Cloud Virtual Servers
                        - Microsoft Azure Virtual Machines
                        - Oracle Cloud Infrastructure (OCI) Compute
                        - OVHcloud Public Cloud Instances
                        - Tencent Cloud Virtual Machine (CVM)

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                            <img src="/img/sld-pouta-image63.svg" alt="IaaS">
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                        # Accessing Pouta
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- A My CSC project with the Pouta service activated
                        - Web user interface: Horizon at <https://pouta.csc.fi>
                        - Programmatic interface: `openstacksdk` (Python)
                          - CLI implementation available on PyPI

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                            <img src="/img/sld-pouta-image30.png" alt="The Horizon web dashboard project overview.">
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                        # The Horizon dashboard
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                            <img src="/img/sld-pouta-image33.png" alt="The Horizon web dashboard showing a project.">
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                        # A LAN party
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- Many independent machines…
                        - …connected together on a local network
                        - A useful mental model for Pouta networking

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                                <img src="/img/sld-pouta-image34.jpg" alt="A large LAN party with many computers.">
                                <figcaption>CC BY-SA 3.0, commons.wikimedia.org/w/index.php?curid=7380926</figcaption>
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                        # Pouta network architecture
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                        flowchart TB
                        NET(( Internet ))
                        NET --- R{{Router}}
                        R --- A["VM 192.168.0.1 (floating IP)"]
                        R --- B["VM 192.168.0.2"]
                        R --- C["VM 192.168.0.3"]
                        R --- D["VM 192.168.0.4"]
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                        # Only LAN, no party
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- Compute instances share a private local network
                        - By default they are **not** reachable from the internet
                        - A floating public IP + security group opens the door
                          - We will set this up in the next section

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Thank you

Joona Tolonen

servicedesk@csc.fi