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Customizations for PyCon 2019

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Jerome Petazzoni
2019-04-22 12:04:33 -05:00
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slides/shared/sampleapp.md
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@@ -165,26 +165,6 @@ https://@@GITREPO@@/blob/8279a3bce9398f7c1a53bdd95187c53eda4e6435/dockercoins/wo
---
class: extra-details
## Links, naming, and service discovery
- Containers can have network aliases (resolvable through DNS)
- Compose file version 2+ makes each container reachable through its service name
- Compose file version 1 did require "links" sections
- Network aliases are automatically namespaced
- you can have multiple apps declaring and using a service named `database`
- containers in the blue app will resolve `database` to the IP of the blue database
- containers in the green app will resolve `database` to the IP of the green database
---
## Show me the code!
- You can check the GitHub repository with all the materials of this workshop:
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---
class: extra-details
## Compose file format version
*This is relevant only if you have used Compose before 2016...*
- Compose 1.6 introduced support for a new Compose file format (aka "v2")
- Services are no longer at the top level, but under a `services` section
- There has to be a `version` key at the top level, with value `"2"` (as a string, not an integer)
- Containers are placed on a dedicated network, making links unnecessary
- There are other minor differences, but upgrade is easy and straightforward
---
## Our application at work
- On the left-hand side, the "rainbow strip" shows the container names