# 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 (>)