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add a registry auth tutorial

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Signed-off-by: Mike Brown <brownwm@us.ibm.com>
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Mike Brown 2020-05-22 12:38:47 -05:00
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docs/registry.md
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@ -86,3 +86,59 @@ The registry credential in this config will only be used when auth config is
not specified by Kubernetes via CRI. not specified by Kubernetes via CRI.
After modify this config, you need restart the `containerd` service. After modify this config, you need restart the `containerd` service.
### Configure Registry Credentials Example - GCR with _json_key Authentication
Create a gcp account with gcr, do all the steps to enable receiving a
pushed image for a gcr instance, including the generation and download of a
new _json_key (for a new service account user.) To make sure your
gcr registry is working with _json_key authentication let's login and
push an image to your gcr instance: *This step is not necessary if you have
already pushed an image to your gcr instance.*
```bash
$ docker login -u _json_key -p "$(cat key.json)" gcr.io
$ docker push gcr.io/your-gcr-instance-id/busybox
$ docker logout gcr.io
```
Generate a single line for the _json_key file that you downloaded:
```bash
jq -c . key.json
```
Edit the containerd config (default location is at /etc/containerd/config.toml)
to add your _json_key authentication for gcr.io domain image pull
requests:
```
[plugins."io.containerd.grpc.v1.cri".registry]
[plugins."io.containerd.grpc.v1.cri".registry.mirrors]
[plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]
endpoint = ["https://registry-1.docker.io"]
[plugins.cri.registry.mirrors."gcr.io"]
endpoint = ["https://gcr.io"]
[plugins."io.containerd.grpc.v1.cri".registry.configs]
[plugins."io.containerd.grpc.v1.cri".registry.configs."gcr.io".auth]
username = "_json_key"
password = 'paste output from jq'
```
Restart containerd
```bash
$ service containerd restart
```
Pull an image from your gcr instance with crictl:
```bash
$ sudo crictl pull gcr.io/your-gcr-instance-id/busybox
DEBU[0000] get image connection
DEBU[0000] connect using endpoint 'unix:///run/containerd/containerd.sock' with '3s' timeout
DEBU[0000] connected successfully using endpoint: unix:///run/containerd/containerd.sock
DEBU[0000] PullImageRequest: &PullImageRequest{Image:&ImageSpec{Image:gcr.io/your-gcr-instance-id/busybox,},Auth:nil,SandboxConfig:nil,}
DEBU[0001] PullImageResponse: &PullImageResponse{ImageRef:sha256:78096d0a54788961ca68393e5f8038704b97d8af374249dc5c8faec1b8045e42,}
Image is up to date for sha256:78096d0a54788961ca68393e5f8038704b97d8af374249dc5c8faec1b8045e42
```