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Jerome Petazzoni fadecd52ee Replace registry:2 with registry

registry used to be registry v1, but now it defaults to v2.
We can therefore drop the tag.

2018-09-28 18:36:29 -05:00

Hosting our own registry

We need to run a registry container
It will store images and layers to the local filesystem
(but you can add a config file to use S3, Swift, etc.)
Docker requires TLS when communicating with the registry
- unless for registries on 127.0.0.0/8 (i.e. localhost)
- or with the Engine flag --insecure-registry

Our strategy: publish the registry container on port 5000,
so that it's available through 127.0.0.1:5000 on each node

Deploying the registry

We will create a single-instance service, publishing its port on the whole cluster

.exercise[

Create the registry service:

docker service create --name registry --publish 5000:5000 registry

Now try the following command; it should return {"repositories":[]}:
```
curl 127.0.0.1:5000/v2/_catalog
```

]