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zfs-migrations/haproxy-migrations.md

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+# Migration test -> prod HAPROXY
+
+---
+
+# Sommaire
+- Haute Disponibilité (HA) : éviter les coupures en prod
+- Déploiement : copie de test à prod
+
+---
+
+# Stratégies de déploiement
+- Blue Green Deployment
+- Rolling Deployment
+
+Ressources : [Ansible](https://docs.ansible.com/ansible/latest/playbook_guide/guide_rolling_upgrade.html#the-rolling-upgrade), [AWS](https://docs.aws.amazon.com/pdfs/whitepapers/latest/blue-green-deployments/blue-green-deployments.pdf#welcome), [Blog Personnel](https://blog.itaysk.com/2017/11/20/deployment-strategies-defined)
+
+---
+
+
+# HA
+![HA01](https://gricad-gitlab.univ-grenoble-alpes.fr/tienyoun/gdml_deployment/-/raw/main/doc/ha/gdml%20deployment%20HA1.png =80%x)
+
+---
+
+# HA
+![HA02](https://gricad-gitlab.univ-grenoble-alpes.fr/tienyoun/gdml_deployment/-/raw/main/doc/ha/gdml%20deployment%20HA2.png =80%x)
+
+---
+
+# HA
+![HA03](https://gricad-gitlab.univ-grenoble-alpes.fr/tienyoun/gdml_deployment/-/raw/main/doc/ha/gdml%20deployment%20HA3.png =80%x)
+
+---
+
+# HA
+![HA04](https://gricad-gitlab.univ-grenoble-alpes.fr/tienyoun/gdml_deployment/-/raw/main/doc/ha/gdml%20deployment%20HA4.png =80%x)
+
+---
+
+# HA : Notes
+- Reverse proxy
+    - X-Forwarded-For
+    - Choix du logiciel : HaProxy, Nginx, Apache...
+- Rollback difficile (sauf si...)
+- Health checks
+- Serveur "sur demande"
+
+---
+
+# Copie test -> prod
+- [ZFS](https://gricad-gitlab.univ-grenoble-alpes.fr/tienyoun/gdml_deployment/-/blob/zfs/prod_deploy.sh?ref_type=heads)
+- [rsync](https://gricad-gitlab.univ-grenoble-alpes.fr/tienyoun/gdml_deployment/-/blob/main/haproxy/prod_deploy.sh?ref_type=heads)
+
+
+---
+
+|                                      | ZFS | rsync |
+| ------------------------------------ | --- | ----- |
+| Abstraction hyperviseur              |     | x     |
+| Simplicité/Complexité de maintenance |     | x     |
+| Simplicité/Complexité d'usage        |     | x     | 
+| Déduplication des données            | x   |       |
+| Optimisation                         | x   |       |
+| Rollback                             | x   | (?)   |
+
+---
+
+# Choix ?
+* **Rsync** : pour les petits datasets ou pour des fichiers "statiques"
+* **ZFS** : pour les grosses données (>)

zfs-migrations/slides.md

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+# Migration Geodesic ZFS
+
+----
+
+# Needs
+![intro](https://gricad-gitlab.univ-grenoble-alpes.fr/uploads/-/system/personal_snippet/339/6a97572d1bf17094e56d38d78c1006eb/intro.png =500x)
+
+----
+
+# Summary
+- Rsync
+    - Offline migration (data files)
+    - Online migration (dumps)
+- Snapshots
+    - Virtual Machines
+    - ZFS/BTRFS
+    - Container-based solutions
+
+----
+
+## rsync/scp : offline migration
+
+![rsync 1](https://gricad-gitlab.univ-grenoble-alpes.fr/uploads/-/system/personal_snippet/339/a0305422abc056b2b03244cf9b08e678/rsync_1.png)
+
+----
+
+## rsync/scp : online migration
+![rsync 2](https://gricad-gitlab.univ-grenoble-alpes.fr/uploads/-/system/personal_snippet/339/8b93709e86166a3078fb4981ea649309/rsync_2.png)
+
+----
+
+## rsync/scp
+#### Possible practical issues :
+- File permissions
+- Postgres permissions
+- SSH keys
+- Configuration mismatch
+
+<!--- Static files : `rsync` or `scp` --->
+```diff
++ No big architectural changes
+- Lots of configuration
+- Heavy : will take time to backup and restore
+- Hacky ?
+```
+
+----
+
+## Snapshots
+
+![gitflow1.svg](https://gricad-gitlab.univ-grenoble-alpes.fr/uploads/-/system/personal_snippet/339/bd9f6a847e821531acde7831c3afa9c7/gitflow1.svg =100%x)
+
+----
+
+## Snapshots
+
+![gitflow2.svg](https://gricad-gitlab.univ-grenoble-alpes.fr/uploads/-/system/personal_snippet/339/98b95ac5511be266098338fa9197288c/gitflow2.svg =100%x)
+
+----
+
+## Snapshots
+
+![gitflow3.svg](https://gricad-gitlab.univ-grenoble-alpes.fr/uploads/-/system/personal_snippet/339/ab3e6403503c24eb218c9af7a4b8b2f5/gitflow3.svg =100%x)
+
+----
+
+## Snapshots
+
+![gitflow4.svg](https://gricad-gitlab.univ-grenoble-alpes.fr/uploads/-/system/personal_snippet/339/f4da1dc71b31e7f4dfc30e724ad1d826/gitflow4.svg =100%x)
+
+----
+
+### Virtual Machine cloning
+```diff
+- Must fiddle with hypervisor
+- We don't want to nest virtual machines
+```
+
+----
+
+### ZFS
+![cow.gif](https://cdn.arstechnica.net/wp-content/uploads/2020/05/copyonwrite-000-nocow.gif)
+> Conventional Filesystem
+
+----
+
+### ZFS
+![cow.gif](https://cdn.arstechnica.net/wp-content/uploads/2020/05/copyonwrite-001-data-comet.gif)
+> Copy on write (CoW)
+
+----
+
+### ZFS
+![cow.gif](https://cdn.arstechnica.net/wp-content/uploads/2020/05/copyonwrite-002-data-worm.gif)
+> Simplified CoW representation
+
+----
+
+### ZFS
+![cow.gif](https://cdn.arstechnica.net/wp-content/uploads/2020/05/copyonwrite-003-visualizing-snapshots.gif)
+> Snapshots using CoW
+
+----
+
+### ZFS
+#### Tools : 
+- [zrepl](https://zrepl.github.io/quickstart.html)
+- [syncoid](https://github.com/jimsalterjrs/sanoid/wiki/Syncoid)
+```diff
++ Automatic / Seamless
+- Possible use of untested additional tools/programs
+- Additional system complexity 
+```
+
+----
+
+### Container-based solutions
+#### LXD
+- Hypervisor for Linux Containers (LXC) and virtual machines
+- Can use ZFS
+- Canonical maintaned
+
+
+```diff
++ Automatic / Seamless
+- Additional architectural complexity 
+```
+
+----
+
+#### Kubernetes Volume Cloning
+
+```diff
++ Automatic / Seamless
+- Additional architectural complexity 
+- Definitely Hacky
+- Kubernetes
+- Better handled with operators/pods
+```