# Rahti ### Storage

# Exercise
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- "Exercise A" from <https://rahti-course.a3s.fi/exercises/index.html>

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                        # Storage in Rahti
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- Temporary storage
                        - Persistent volumes
                        - Object storage (Allas)
                        - Configuration: ConfigMaps and Secrets

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                        # Temporary storage
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- Traditional filesystem approach: `emptyDir`
                          - A directory mounted in the file hierarchy
                        - Local and temporary storage
                          - The fastest volume type available
                          - Data is lost when the application is killed / restarted

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                            <img src="/img/sld-rahti-image53.png" alt="Temporary storage mounted inside a pod.">
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                        # Persistent volumes
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- Traditional filesystem approach: a directory mounted in the file hierarchy
                        - The underlying technology is called Cinder

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                        # Object storage (Allas)
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- It is not a file storage ➡️ a different use case from the OS point of view
                          - Accessed through an API
                        - Default quota is 10 TiB
                        - Hard limits:
                          - 1 000 buckets / project
                          - 500 000 objects / bucket

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                            <img src="/img/sld-rahti-image54.png" alt="Allas object storage accessed through an API.">
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                        # Configuration: ConfigMaps and Secrets
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- Stored as internal API objects
                        - Configuration files:
                          - Can be edited directly in the web interface
                          - …or as YAML or JSON objects
                        - Can be mounted as files or as environment variables
                        - Secrets are ConfigMaps with an extra layer of security

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Thank you

Joona Tolonen

servicedesk@csc.fi