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| pilgrimstack | plop | 15:21 |
|---|---|---|
| pilgrimstack | quelqu'un sait comment s'appelle la feature equivalente à availibility zone chez amazon ? | 15:21 |
| pilgrimstack | pfreund: en tant qu'expert aws, je sais que tu as ma réponse ;) | 15:22 |
| pilgrimstack | J'ai trouvé !!! | 15:23 |
| pilgrimstack | ca s'appelle Availabilty Zone ! | 15:24 |
| pilgrimstack | Amazing | 15:24 |
| pilgrimstack | voila voila | 15:24 |
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| pilgrimstack | pfreund: du coup ma question se transforme en : est ce que je peux faire des groupes affinity/anti-affinity aussi sur AWS pour spliter ou rassembler mes workload ? Si oui, comment s'appelle l'equivalent des group affinity ? | 15:34 |
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| pfreund | pilgrimstack: bonne question | 17:07 |
| pfreund | je sais pas si il est possible de donner des règles de dispo à l'intérieur d'une AZ | 17:08 |
| pfreund | vu que c'est le principe de l'AZ qui permet de s'assurer de la HA | 17:08 |
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| pilgrimstack | c'est à dire ? | 17:09 |
| pilgrimstack | sur openstack, les équipe infra créent les AZ, et l'utilisateur les utilise avec des groupes | 17:10 |
| pilgrimstack | group foo, policy anti-affinity | 17:10 |
| pilgrimstack | create ins1 et inst2 dans group foo me donne la garantie que inst1 ne sera pas dans la même AZ que inst2 | 17:11 |
| pilgrimstack | si il n'y a pas de notion de groupe sur AWS, comment ils gèrent une anti-affinité par exemple ? | 17:11 |
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| pfreund | Il me semble bien que la notion d'AZ n'est pas identique sur OpenStack et AWS. | 17:13 |
| pfreund | AZ sur AWS signifie bien zone géographique différente à l'intérieur d'une région, ce qui n'est pas forcément le cas sur OpenStack | 17:14 |
| pfreund | Sur AWS, dans un Autoscaling group tu peux indiquer les AZ que tu souhaites utiliser (tu peux en utiliser que 2 sur 3 par exemple si tu as des réservations que sur ces deux AZ) | 17:15 |
| pfreund | l'autoscaling group gère lui même le placement des instances afin de gérer au mieux la HA | 17:15 |
| pfreund | Il y a la notion de Placement group sur AWS te permettant de regrouper tes instances sur une même zone (peut être une baie je sais plus), afin d'avoir un minimum de latence | 17:16 |
| pilgrimstack | mmmmh curieux | 17:17 |
| pilgrimstack | si je pose la question autrement : | 17:17 |
| pfreund | tout ca pour dire que "Je veux deux instances dans la même AZ mais pas dans la même baie" je sais pas si ca existe | 17:17 |
| pilgrimstack | je veux démarrer juste 2 instances, pas besoin de autoscaling, ces instances doivent être sur des infra physiques indépendantes (je ne veux pas que si le block alim d'une infra tombe, mes 2 instances tombent) | 17:18 |
| pfreund | alors la bonne pratique est de les mettre sur deux AZ distinctes | 17:19 |
| pfreund | (et pour info 1AZ = 1 ou plusieurs Datacenters) | 17:19 |
| pilgrimstack | ok, je commence a comprendre la subtilité | 17:19 |
| pilgrimstack | sur OS tu peux live migrate une instance d'une AZ vers l'autre | 17:20 |
| pilgrimstack | donc possibilité de casser ta séparation | 17:20 |
| pfreund | le live migrate n'existe meme pas sur AWS | 17:20 |
| pilgrimstack | d'ou la necessité de gérer des groupes (encore faut-il que les groupes soient pris en compte sur un live migrate) | 17:21 |
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| pilgrimstack | sur AWS, si tu veux migrer d'une AZ vers une autre, il faut snap puis respawn | 17:21 |
| pfreund | oui | 17:23 |
| pfreund | mais bon sur le papier c'est plutot terminate et respawn | 17:23 |
| pilgrimstack | yep | 17:23 |
| pilgrimstack | thx m'sieu | 17:23 |
| pfreund | ce qui peut arriver, au dela de l'AZ que tu voudrais quitter, c'est le host qui va être décommisionné ou mis à jour. Dans ce cas AWS te prévient que ton instance va être arrêtée | 17:23 |
| pfreund | avec un stop / start, si leur host est vu comme en maintenance, l'instance démarre sur un autre host saint | 17:24 |
| pfreund | (toujours dans la même AZ) | 17:24 |
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