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# TP Rolling Update
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Maîtriser les mises à jour d'applications.
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* Créer un service nommé `wit` basé sur l'image
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`xian310/who-is-there:1`
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- publier le port 8080 sur le port 8080 de l'hôte
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- Augmenter le nombre de réplicas à `10`
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* Vérifier que tout est OK
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<!-- .slide: data-background="#2E2E2E" data-state="small-code" -->
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Créer le service `wit`
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```none
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$ docker service create --name wit --publish 8080:8080 xian310/who-is-there:1
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pm5wkigy4m5bbtby5kccgh62y
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overall progress: 1 out of 1 tasks
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1/1: running [==================================================>]
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verify: Service converged
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```
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Augmenter le nombre de réplicas à `10`
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```none
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$ docker service scale wit=10
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wit scaled to 10
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overall progress: 10 out of 10 tasks
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1/10: running [==================================================>]
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2/10: running [==================================================>]
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3/10: running [==================================================>]
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4/10: running [==================================================>]
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5/10: running [==================================================>]
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6/10: running [==================================================>]
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7/10: running [==================================================>]
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8/10: running [==================================================>]
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9/10: running [==================================================>]
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10/10: running [==================================================>]
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verify: Service converged
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```
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<!-- .slide: data-background="#2E2E2E" data-state="small-code" -->
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Vérifier que les 10 réplicas sont bien créés
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```none
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$ docker service ps wit
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ID NAME IMAGE NODE DESIRED S. CURRENT STATE
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wc8iu98rk5k5 wit.1 xian310/who-is-there:1 docker-1 Running Running 2 minutes ago
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vhj8dqrn2auo wit.2 xian310/who-is-there:1 docker-1 Running Running about a minute ago
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w2ccwu1p131e wit.3 xian310/who-is-there:1 docker-1 Running Running about a minute ago
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9aels4fc44oi wit.4 xian310/who-is-there:1 docker-1 Running Running about a minute ago
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x4hm8nnmpyj6 wit.5 xian310/who-is-there:1 docker-1 Running Running about a minute ago
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uz4jew83vgdz wit.6 xian310/who-is-there:1 docker-1 Running Running about a minute ago
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2oy1al8c93mu wit.7 xian310/who-is-there:1 docker-1 Running Running about a minute ago
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in2pxcvg6lyi wit.8 xian310/who-is-there:1 docker-1 Running Running about a minute ago
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7sbqqr9k5wdq wit.9 xian310/who-is-there:1 docker-1 Running Running about a minute ago
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yvbljq6gb3ir wit.10 xian310/who-is-there:1 docker-1 Running Running about a minute ago
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```
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* Dans un premier terminal, lancer un watch sur la commande `docker service ps wit`.
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* Dans un second terminal, mettre à jour l'image sur laquelle le service est basé.
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* Observer les changements en temps réel dans le premier terminal.
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<!-- .slide: data-background="#2E2E2E" data-state="small-code" -->
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Mettre à jour l'image
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```none
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$ docker service update wit --image xian310/who-is-there:2
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```
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<!-- .slide: data-background="#2E2E2E" data-state="small-code" -->
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Après quelques secondes...
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```none
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$ watch docker service ps wit
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ID NAME IMAGE NODE DESIRED S. CURRENT STATE
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wc8iu98rk5k5 wit.1 xian310/who-is-there:1 docker-1 Running Running 6 minutes ago
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vhj8dqrn2auo wit.2 xian310/who-is-there:1 docker-1 Running Running 4 minutes ago
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w2ccwu1p131e wit.3 xian310/who-is-there:1 docker-1 Running Running 4 minutes ago
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ppglvxmngnz2 wit.4 xian310/who-is-there:2 docker-1 Ready Ready less than a secon
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9aels4fc44oi \_ wit.4 xian310/who-is-there:1 docker-1 Shutdown Running less than a sec
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ttue4n87o1cu wit.5 xian310/who-is-there:2 docker-1 Running Running 5 seconds ago
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x4hm8nnmpyj6 \_ wit.5 xian310/who-is-there:1 docker-1 Shutdown Shutdown 7 seconds ago
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uz4jew83vgdz wit.6 xian310/who-is-there:1 docker-1 Running Running 4 minutes ago
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2oy1al8c93mu wit.7 xian310/who-is-there:1 docker-1 Running Running 4 minutes ago
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in2pxcvg6lyi wit.8 xian310/who-is-there:1 docker-1 Running Running 4 minutes ago
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7sbqqr9k5wdq wit.9 xian310/who-is-there:1 docker-1 Running Running 4 minutes ago
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1jcfqalsi6sc wit.10 xian310/who-is-there:2 docker-1 Running Running 1 second ago
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yvbljq6gb3ir \_ wit.10 xian310/who-is-there:1 docker-1 Shutdown Shutdown 1 second ago
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```
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<!-- .slide: data-background="#2E2E2E" data-state="small-code" -->
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Un peu plus tard...
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```none
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ID NAME IMAGE NODE DESIRED S. CURRENT STATE
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oodma7llrqzn wit.1 xian310/who-is-there:2 docker-1 Running Running 28 seconds ago
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wc8iu98rk5k5 \_ wit.1 xian310/who-is-there:1 docker-1 Shutdown Shutdown 29 seconds ago
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jf6dw9uoyghb wit.2 xian310/who-is-there:2 docker-1 Running Running 46 seconds ago
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vhj8dqrn2auo \_ wit.2 xian310/who-is-there:1 docker-1 Shutdown Shutdown 46 seconds ago
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w4zk5sgd6t74 wit.3 xian310/who-is-there:2 docker-1 Running Running 41 seconds ago
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w2ccwu1p131e \_ wit.3 xian310/who-is-there:1 docker-1 Shutdown Shutdown 42 seconds ago
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ppglvxmngnz2 wit.4 xian310/who-is-there:2 docker-1 Running Running 59 seconds ago
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9aels4fc44oi \_ wit.4 xian310/who-is-there:1 docker-1 Shutdown Shutdown 59 seconds ago
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ttue4n87o1cu wit.5 xian310/who-is-there:2 docker-1 Running Running about a minute
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x4hm8nnmpyj6 \_ wit.5 xian310/who-is-there:1 docker-1 Shutdown Shutdown about a minute
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xl9j97q560vd wit.6 xian310/who-is-there:2 docker-1 Running Running 50 seconds ago
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uz4jew83vgdz \_ wit.6 xian310/who-is-there:1 docker-1 Shutdown Shutdown 51 seconds ago
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m471v74d0rog wit.7 xian310/who-is-there:2 docker-1 Running Running 37 seconds ago
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2oy1al8c93mu \_ wit.7 xian310/who-is-there:1 docker-1 Shutdown Shutdown 38 seconds ago
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ssiull3z1h68 wit.8 xian310/who-is-there:2 docker-1 Running Running 54 seconds ago
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in2pxcvg6lyi \_ wit.8 xian310/who-is-there:1 docker-1 Shutdown Shutdown 55 seconds ago
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zfbxw3yns3ec wit.9 xian310/who-is-there:2 docker-1 Running Running 33 seconds ago
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7sbqqr9k5wdq \_ wit.9 xian310/who-is-there:1 docker-1 Shutdown Shutdown 34 seconds ago
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1jcfqalsi6sc wit.10 xian310/who-is-there:2 docker-1 Running Running about a minute
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yvbljq6gb3ir \_ wit.10 xian310/who-is-there:1 docker-1 Shutdown Shutdown about a minute
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```
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* Effectuer un rollback pour revenir à la version précédente de l'application.
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<!-- .slide: data-background="#2E2E2E" data-state="small-code" -->
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Retour à la version précédente
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```none
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$ docker service rollback wit
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ou
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$ docker service update wit --image xian310/who-is-there:1
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```
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Un peu plus tard...
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```none
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$ docker service ps wit
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ID NAME IMAGE NODE DESIRED S. CURRENT STATE
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ud4218ok1y48 wit.1 xian310/who-is-there:1 docker-1 Running Running 50 seconds ago
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oodma7llrqzn \_ wit.1 xian310/who-is-there:2 docker-1 Shutdown Shutdown 51 seconds ago
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wc8iu98rk5k5 \_ wit.1 xian310/who-is-there:1 docker-1 Shutdown Shutdown 38 minutes ago
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nk23q3nxe13g wit.2 xian310/who-is-there:1 docker-1 Running Running 24 seconds ago
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jf6dw9uoyghb \_ wit.2 xian310/who-is-there:2 docker-1 Shutdown Shutdown 25 seconds ago
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vhj8dqrn2auo \_ wit.2 xian310/who-is-there:1 docker-1 Shutdown Shutdown 38 minutes ago
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3issn6des2o7 wit.3 xian310/who-is-there:1 docker-1 Running Running 41 seconds ago
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w4zk5sgd6t74 \_ wit.3 xian310/who-is-there:2 docker-1 Shutdown Shutdown 42 seconds ago
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w2ccwu1p131e \_ wit.3 xian310/who-is-there:1 docker-1 Shutdown Shutdown 38 minutes ago
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...
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```
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Un seul niveau de retour arrière est possible.
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Les options `--update-parallelism` et `--update-delay` permettent d'influencer le déroulement des opérations.
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