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Merge pull request #13425 from bmcelvee/osdocs-227-configuring-registry
osdocs-227 accessing registry modules
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‎_topic_map.yml

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Topics:
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- Name: Registry options
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File: registry-options
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- Name: Accessing the registry
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File: accessing-the-registry
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---
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Name: Scalability and performance
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Dir: scalability_and_performance

‎modules/registry-accessing-directly.adoc

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// Module included in the following assemblies:
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//
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// * assembly/registry
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[id='registry-accessing-directly-{context}']
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= Accessing registry directly
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You can access the registry directly to invoke `docker` commands. This allows
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you to push images to or pull them from the integrated registry directly using
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operations like `docker push` or `docker pull`. To do so, you must be logged in
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to the registry using the `docker login` command. The operations you can perform
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depend on your user permissions, as described in the following sections.
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.Prerequisites
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* For any direct access, you must have a regular user for your preferred identity
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provider.
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** A regular user can generate an access token required for logging in to
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the registry.
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** System users, such as *system:admin*, cannot obtain access tokens
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and, therefore, cannot access the registry directly.
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+
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For example, if you are using `HTPASSWD` authentication, you can create one
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using the following command:
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+
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----
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# htpasswd /etc/origin/openshift-htpasswd <user_name>
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----
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* For pulling images, for example when using the `docker pull` command,
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the user must have the *registry-viewer* role. To add this role:
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+
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----
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$ oc policy add-role-to-user registry-viewer <user_name>
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----
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* For writing or pushing images, for example when using the `docker push` command,
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the user must have the *registry-editor* role. To add this role:
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+
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----
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$ oc policy add-role-to-user registry-editor <user_name>
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----
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.Procedure
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. Log in to the registry directly:
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.. Ensure you are logged in to {product-title} as a *regular user*:
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+
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----
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$ oc login
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----
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.. Log in to the container image registry by using your access token:
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+
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----
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docker login -u openshift -p $(oc whoami -t) <registry_ip>:<port>
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----
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+
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[NOTE]
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====
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You can pass any value for the username, the token contains all necessary
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information. Passing a username that contains colons will result in a login
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failure.
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====
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+
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. Perform `docker pull` and `docker push` operations against your registry:
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+
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[IMPORTANT]
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====
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You can pull arbitrary images, but if you have the *system:registry* role
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added, you can only push images to the registry in your project.
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====
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+
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In the following examples, we use:
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+
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|====
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|Component |Value
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|*<registry_ip>*
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|`172.30.124.220`
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|*<port>*
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|`5000`
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|*<project>*
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|`openshift`
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|*<image>*
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|`busybox`
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|*<tag>*
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| omitted (defaults to `latest`)
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|====
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.. Pull an arbitrary image:
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+
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----
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$ docker pull docker.io/busybox
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----
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.. Tag the new image with the form `<registry_ip>:<port>/<project>/<image>`.
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The project name *must* appear in this pull specification for {product-title} to
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correctly place and later access the image in the registry:
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+
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----
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$ docker tag docker.io/busybox 172.30.124.220:5000/openshift/busybox
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----
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+
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[NOTE]
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====
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Your regular user must have the *system:image-builder* role for the specified
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project, which allows the user to write or push an image. Otherwise, the `docker
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push` in the next step will fail. To test, you can create a new project to
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push the *busybox* image.
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====
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.. Push the newly-tagged image to your registry:
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+
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----
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$ docker push 172.30.124.220:5000/openshift/busybox
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...
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cf2616975b4a: Image successfully pushed
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Digest: sha256:3662dd821983bc4326bee12caec61367e7fb6f6a3ee547cbaff98f77403cab55
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----

‎modules/registry-accessing-metrics.adoc

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// Module included in the following assemblies:
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//
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// * assembly/registry
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[id='registry-accessing-metrics-{context}']
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= Accessing registry metrics
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The OpenShift Container Registry provides an endpoint for
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link:https://prometheus.io/docs/introduction/overview/[Prometheus metrics].
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Prometheus is a stand-alone, open source systems monitoring and alerting
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toolkit.
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The metrics are exposed at the *_/extensions/v2/metrics_* path of the registry
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endpoint. However, this route must first be enabled; see
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Extended Registry Configuration for instructions.
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// Recommended link to extended registry configuration assembly.
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.Procedure
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There are two ways in which you can access the metrics: running a metrics query
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or by using the cluster role.
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*Metrics query*
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. Run a metrics query, for example:
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+
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[source, bash]
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----
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$ curl -s -u <user>:<secret> \ <1>
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http://172.30.30.30:5000/extensions/v2/metrics | grep openshift | head -n 10
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# HELP openshift_build_info A metric with a constant '1' value labeled by major, minor, git commit & git version from which OpenShift was built.
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# TYPE openshift_build_info gauge
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openshift_build_info{gitCommit="67275e1",gitVersion="v3.6.0-alpha.1+67275e1-803",major="3",minor="6+"} 1
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# HELP openshift_registry_request_duration_seconds Request latency summary in microseconds for each operation
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# TYPE openshift_registry_request_duration_seconds summary
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openshift_registry_request_duration_seconds{name="test/origin-pod",operation="blobstore.create",quantile="0.5"} 0
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openshift_registry_request_duration_seconds{name="test/origin-pod",operation="blobstore.create",quantile="0.9"} 0
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openshift_registry_request_duration_seconds{name="test/origin-pod",operation="blobstore.create",quantile="0.99"} 0
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openshift_registry_request_duration_seconds_sum{name="test/origin-pod",operation="blobstore.create"} 0
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openshift_registry_request_duration_seconds_count{name="test/origin-pod",operation="blobstore.create"} 5
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----
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<1> `<user>` can be arbitrary, but `<secret>` must match the value specified in the
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registry configuration.
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*Cluster role*
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. Create a cluster role if you do not already have one to access the metrics:
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+
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[source, bash]
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----
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$ cat <<EOF |
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRole
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metadata:
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name: prometheus-scraper
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rules:
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- apiGroups:
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- image.openshift.io
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resources:
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- registry/metrics
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verbs:
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- get
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EOF
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oc create -f -
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----
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. Add this role to a user, run the following command:
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+
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[source, bash]
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----
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$ oc adm policy add-cluster-role-to-user prometheus-scraper <username>
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----
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. Access the metrics using cluster role. You still need to
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enable the endpoint, but you do not need to specify a `<secret>`. The part of
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the configuration file responsible for metrics should look like this:
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----
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openshift:
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version: 1.0
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metrics:
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enabled: true
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...
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----

‎modules/registry-viewing-contents.adoc

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// Module included in the following assemblies:
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//
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// * assembly/registry
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[id='registry-viewing-contents-{context}']
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= Viewing the registry's contents
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Tag and image metadata is stored in {product-title}, but the registry stores
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layer and signature data in a volume that is mounted into the registry container
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at *_/registry_*. As `oc exec` does not work on privileged containers, to view a
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registry's contents you must manually SSH into the node housing the registry
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pod's container, then run `docker exec` on the container itself.
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.Procedure
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. List the current pods to find the pod name of your container image registry:
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+
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----
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# oc get pods
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----
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+
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Then, use `oc describe` to find the host name for the node running the
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container:
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+
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----
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# oc describe pod <pod_name>
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----
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. Log into the desired node:
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+
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----
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# ssh node.example.com
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----
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. List the running containers from the default project on the node host and identify the container ID for
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the container image registry:
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+
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----
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# docker ps --filter=name=registry_docker-registry.*_default_
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----
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. List the registry contents using the `oc rsh` command:
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+
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----
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# oc rsh dc/docker-registry find /registry
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/registry/docker
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/registry/docker/registry
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/registry/docker/registry/v2
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/registry/docker/registry/v2/blobs <1>
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/registry/docker/registry/v2/blobs/sha256
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/registry/docker/registry/v2/blobs/sha256/ed
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/registry/docker/registry/v2/blobs/sha256/ed/ede17b139a271d6b1331ca3d83c648c24f92cece5f89d95ac6c34ce751111810
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/registry/docker/registry/v2/blobs/sha256/ed/ede17b139a271d6b1331ca3d83c648c24f92cece5f89d95ac6c34ce751111810/data <2>
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/registry/docker/registry/v2/blobs/sha256/a3
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/registry/docker/registry/v2/blobs/sha256/a3/a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4
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/registry/docker/registry/v2/blobs/sha256/a3/a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4/data
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/registry/docker/registry/v2/blobs/sha256/f7
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/registry/docker/registry/v2/blobs/sha256/f7/f72a00a23f01987b42cb26f259582bb33502bdb0fcf5011e03c60577c4284845
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/registry/docker/registry/v2/blobs/sha256/f7/f72a00a23f01987b42cb26f259582bb33502bdb0fcf5011e03c60577c4284845/data
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/registry/docker/registry/v2/repositories <3>
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/registry/docker/registry/v2/repositories/p1
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/registry/docker/registry/v2/repositories/p1/pause <4>
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/registry/docker/registry/v2/repositories/p1/pause/_manifests
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/registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions
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/registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256
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/registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf
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/registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf/signatures <5>
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/registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf/signatures/sha256
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/registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf/signatures/sha256/ede17b139a271d6b1331ca3d83c648c24f92cece5f89d95ac6c34ce751111810
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/registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf/signatures/sha256/ede17b139a271d6b1331ca3d83c648c24f92cece5f89d95ac6c34ce751111810/link <6>
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/registry/docker/registry/v2/repositories/p1/pause/_uploads <7>
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/registry/docker/registry/v2/repositories/p1/pause/_layers <8>
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/registry/docker/registry/v2/repositories/p1/pause/_layers/sha256
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/registry/docker/registry/v2/repositories/p1/pause/_layers/sha256/a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4
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/registry/docker/registry/v2/repositories/p1/pause/_layers/sha256/a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4/link <9>
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/registry/docker/registry/v2/repositories/p1/pause/_layers/sha256/f72a00a23f01987b42cb26f259582bb33502bdb0fcf5011e03c60577c4284845
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/registry/docker/registry/v2/repositories/p1/pause/_layers/sha256/f72a00a23f01987b42cb26f259582bb33502bdb0fcf5011e03c60577c4284845/link
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----
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<1> This directory stores all layers and signatures as blobs.
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<2> This file contains the blob's contents.
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<3> This directory stores all the image repositories.
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<4> This directory is for a single image repository *p1/pause*.
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<5> This directory contains signatures for a particular image manifest revision.
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<6> This file contains a reference back to a blob (which contains the signature
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data).
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<7> This directory contains any layers that are currently being uploaded and
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staged for the given repository.
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<8> This directory contains links to all the layers this repository references.
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<9> This file contains a reference to a specific layer that has been linked into
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this repository via an image.

‎modules/registry-viewing-logs.adoc

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// Module included in the following assemblies:
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//
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// * assembly/registry
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[id='registry-viewing-logs-{context}']
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= Viewing registry logs
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You can view the logs for the registry by using the `oc logs` command.
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.Procedure
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. Use the `oc logs` command with the deployment configuration to view the logs
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for the container image registry:
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+
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----
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$ oc logs dc/docker-registry
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2015-05-01T19:48:36.300593110Z time="2015-05-01T19:48:36Z" level=info msg="version=v2.0.0+unknown"
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2015-05-01T19:48:36.303294724Z time="2015-05-01T19:48:36Z" level=info msg="redis not configured" instance.id=9ed6c43d-23ee-453f-9a4b-031fea646002
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2015-05-01T19:48:36.303422845Z time="2015-05-01T19:48:36Z" level=info msg="using inmemory layerinfo cache" instance.id=9ed6c43d-23ee-453f-9a4b-031fea646002
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2015-05-01T19:48:36.303433991Z time="2015-05-01T19:48:36Z" level=info msg="Using OpenShift Auth handler"
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2015-05-01T19:48:36.303439084Z time="2015-05-01T19:48:36Z" level=info msg="listening on :5000" instance.id=9ed6c43d-23ee-453f-9a4b-031fea646002
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----

‎registry/PLACEHOLDER

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‎registry/accessing-the-registry.adoc

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:context: accessing-the-registry.adoc
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= Accessing the registry
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include::modules/common-attributes.adoc[]
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toc::[]
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Use the following sections for instructions on accessing the registry, including
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viewing logs and metrics, as well as securing and exposing the registry.
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include::modules/registry-accessing-directly.adoc[leveloffset=+1]
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include::modules/registry-viewing-contents.adoc[leveloffset=+1]
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include::modules/registry-viewing-logs.adoc[leveloffset=+1]
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include::modules/registry-accessing-metrics.adoc[leveloffset=+1]

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