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@ -4,13 +4,29 @@ keywords: docker, registry, dtr, architecture
title: DTR architecture
---
Docker Trusted Registry (DTR) is a Dockerized application that runs on a Docker
Universal Control Plane cluster.
Docker Trusted Registry is a containerized application that runs on-premises
or on the cloud and allows you to store and manage your Docker images. It
needs to be deployed on a worker node managed by UCP.
![](images/architecture-1.png)
![](images/architecture-1.svg)
Since DTR exposes the standard Docker API you can continue using the
Docker CLI client to push and pull images to DTR.
Universal Control Plane integrates out of the box with DTR so that you can
deploy services and applications to your UCP cluster, using the Docker images
you store in DTR.
## Under the hood
DTR needs to be deployed in a worker node managed by UCP.
![](images/architecture-2.svg)
For high-availability you can join multiple replicas to a DTR cluster.
[Learn more about high availability](high-availability/index.md).
## Containers
## DTR internal components
When you install DTR on a node, the following containers are started:
@ -27,18 +43,8 @@ When you install DTR on a node, the following containers are started:
All these components are for internal use of DTR. Don't use them in your applications.
## Networks
To allow containers to communicate, when installing DTR the following networks
are created:
| Name | Type | Description |
|:-------|:--------|:---------------------------------------------------------------------------------------|
| dtr-br | bridge | Allows DTR components on the same node to communicate with each other in a secure way |
| dtr-ol | overlay | Allows DTR components running on different nodes to communicate, to replicate DTR data |
## Volumes
## Volumes used by DTR
DTR uses these named volumes for persisting data:
@ -58,10 +64,23 @@ don't exist in the node, and creates them using the default volume driver.
By default, the data for these volumes can be found at
`/var/lib/docker/volumes/<volume-name>/_data`.
## Image storage
## Networks used by DTR
To allow containers to communicate, when installing DTR the following networks
are created:
| Name | Type | Description |
|:-------|:--------|:---------------------------------------------------------------------------------------|
| dtr-br | bridge | Allows DTR components on the same node to communicate with each other in a secure way |
| dtr-ol | overlay | Allows DTR components running on different nodes to communicate, to replicate DTR data |
## Where DTR stores images
By default, Docker Trusted Registry stores images on the filesystem of the node
where it is running.
where it is running, but you can configure it to use an external storage system.
![](images/architecture-3.svg)
You can also configure DTR to use these storage backends:
@ -74,11 +93,17 @@ You can also configure DTR to use these storage backends:
For highly available installations, you should use a cloud storage system
instead of an NFS mount, since they usually have better performance.
## High-availability support
## How you interact with DTR
Since DTR exposes the standard Docker API you can continue using the
Docker CLI client to push and pull images to DTR.
Universal Control Plane integrates out of the box with DTR so that you can
deploy services and applications to your UCP cluster, using the Docker images
you store in DTR.
![](images/architecture-4.svg)
For load balancing and high-availability, you can install multiple replicas of
DTR, and join them to create a cluster.
[Learn more about high availability](high-availability/index.md).
## Where to go next

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@ -8,6 +8,8 @@ Docker Trusted Registry is designed to scale horizontally as your usage
increases. You can add or remove replicas to make DTR scale to your needs
or for high availability.
![](../images/scale-your-deployment-1.svg)
To set up DTR for [high availability](../high-availability/index.md),
you can add more replicas to your DTR cluster. Adding more replicas allows you
to load-balance requests across all replicas, and keep DTR working if a

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@ -5,12 +5,45 @@ title: UCP architecture
---
Universal Control Plane is a containerized application that runs on the
Commercially Supported (CS) Docker Engine. It allows you to manage from a
centralized place a set of nodes that are part of the same swarm.
Commercially Supported (CS) Docker Engine, and extends its functionality to
make it easier to deploy, configure, and monitor your applications at scale.
![](images/architecture-1.png)
It also secures Docker with role-based access control so that only authorized
users can make changes and deploy applications to your Docker cluster.
## UCP components
![](images/architecture-1.svg)
Once Universal Control Plane (UCP) is deployed, developers and IT operations
no longer interact with Docker Engine directly, but interact with UCP instead.
Since UCP exposes the standard Docker API this is all done transparently, so
that you can use the tools you already know and love like the Docker CLI client
and Docker Compose.
## Under the hood
Docker UCP leverages the clustering and orchestration functionality provided
by Docker.
![](images/architecture-2.svg)
When you deploy UCP, it starts running a globally scheduled service called
`ucp-agent`. This service monitors the node where it is running and starts
and stops UCP services, based on whether that node is a
[manager or a worker node](https://docs.docker.com/engine/swarm/key-concepts/).
If the node is a:
* **Manager**: the `ucp-agent` service automatically starts serving all UCP
components including the UCP web UI and data stores used by UCP. By promoting
a node to manager, UCP automatically becomes highly available and fault tolerant.
* **Worker**: on worker nodes the `ucp-agent` service starts serving a proxy
service that ensures only authorized users and other UCP services can run Docker
commands in that node.
## UCP internal components
The core component of UCP is a globally-scheduled service called `ucp-agent`.
When you install UCP on a node, or join a node to a swarm that is being managed
@ -19,24 +52,40 @@ by UCP, the `ucp-agent` service starts running on that node.
Once this service is running, it deploys containers with other UCP components,
and ensures they keep running. The UCP components that are deployed
on a node depend on whether that node is a manager or a worker.
Manager nodes are responsible for maintaining the swarm state and scheduling
decisions. Worker nodes are responsible for executing workloads.
| Name | Node | Description |
|:--------------------|:----------------|:----------------------------------------------------------------------------------------------------------|
| ucp-auth-api | Manager | The centralized service for identity and authentication used by UCP and DTR |
| ucp-auth-store | Manager | Stores authentication configurations, and data for users, organizations and teams |
| ucp-auth-worker | Manager | Performs scheduled LDAP synchronizations and cleans authentication and authorization data |
| ucp-client-root-ca | Manager | A certificate authority to sign client bundles |
| ucp-cluster-root-ca | Manager | A certificate authority used for TLS communication between UCP components |
| ucp-controller | Manager | The UCP web server |
| ucp-kv | Manager | Used to store the UCP configurations. Don't use it in your applications, since it's for internal use only |
| ucp-proxy | Manager, worker | A TLS proxy. It allows secure access to the local Docker Engine to UCP components |
| ucp-swarm-manager | Manager | Used to provide backwards-compatibility with Docker Swarm |
### UCP components in manager nodes
## Volumes
Manager nodes run all UCP services, including the web UI and data stores that
persist the state of UCP. These are the UCP services running on manager nodes:
Docker UCP uses these named volumes to persist data:
| UCP component | Description |
|:--------------------|:--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ucp-agent | Monitors the node and ensures the right UCP services are running |
| ucp-reconcile | When ucp-agent detects that the node is not running the right UCP services, it starts the ucp-reconcile service to start or stop the necessary services to converge the node to its desired state |
| ucp-auth-api | The centralized service for identity and authentication used by UCP and DTR |
| ucp-auth-store | Stores authentication configurations, and data for users, organizations and teams |
| ucp-auth-worker | Performs scheduled LDAP synchronizations and cleans authentication and authorization data |
| ucp-client-root-ca | A certificate authority to sign client bundles |
| ucp-cluster-root-ca | A certificate authority used for TLS communication between UCP components |
| ucp-controller | The UCP web server |
| ucp-kv | Used to store the UCP configurations. Don't use it in your applications, since it's for internal use only |
| ucp-proxy | A TLS proxy. It allows secure access to the local Docker Engine to UCP components |
| ucp-swarm-manager | Used to provide backwards-compatibility with Docker Swarm |
### UCP components in worker nodes
Worker nodes are the ones where you run your applications. These are the UCP
services running on worker nodes:
| UCP component | Description |
|:--------------|:--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ucp-agent | Monitors the node and ensures the right UCP services are running |
| ucp-reconcile | When ucp-agent detects that the node is not running the right UCP services, it starts the ucp-reconcile service to start or stop the necessary services to converge the node to its desired state |
| ucp-proxy | A TLS proxy. It allows secure access to the local Docker Engine to UCP components |
## Volumes used by UCP
Docker UCP uses these named volumes to persist data in all nodes where it runs:
| Volume name | Description |
|:----------------------------|:-----------------------------------------------------------------------------------------|
@ -61,6 +110,23 @@ driver.
By default, the data for these volumes can be found at
`/var/lib/docker/volumes/<volume-name>/_data`.
## How you interact with UCP
There are two ways to interact with UCP: the web UI or the CLI.
You can use the UCP web UI to manage your cluster, grant and revoke user
permissions, deploy, configure, manage, and monitor your applications.
![](images/architecture-3.svg)
UCP also exposes the standard Docker API, so you can continue using existing
tools like the Docker CLI client. Since UCP secures your cluster with role-based
access control, you need to configure your Docker CLI client and other client
tools to authenticate your requests using
[client certificates](access-ucp/cli-based-access.md) that you can download
from your UCP profile page.
## Where to go next
* [System requirements](installation/index.md)

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34
datacenter/ucp/2.0/guides/installation/scale-your-cluster.md
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@ -9,23 +9,33 @@ Docker UCP is designed for scaling horizontally as your applications grow in
size and usage. You can add or remove nodes from the UCP cluster to make it
scale to your needs.
UCP leverages the Docker Engine functionality to run multiple Docker Engines
in swarm mode. When you join a node to your cluster, you can join the node as a
manager or worker:
![](../images/scale-your-cluster-1.svg)
* Manager node
Since UCP leverages the clustering functionality provided by Docker Engine,
you use the [docker swarm join](/engine/swarm/swarm-tutorial/add-nodes.md)
command to add more nodes to your cluster. When joining new nodes, the UCP
services automatically start running in that node.
When joining a node a a cluster you can specify its role: manager or worker.
* **Manager nodes**
Manager nodes are responsible for cluster management functionality and
dispatching tasks to worker nodes.
Having multiple manager nodes allows your cluster to be highly-available
and tolerate node failures. It also allows you to load-balance user requests
to the cluster.
[Learn more about high-availability](../high-availability/index.md).
dispatching tasks to worker nodes. Having multiple manager nodes allows
your cluster to be highly-available and tolerate node failures.
* Worker nodes
Manager nodes also run all UCP components in a replicated way, so by adding
additional manager nodes you're also making UCP highly available.
[Learn more about the UCP architecture.](../architecture.md)
Worker nodes receive and execute tasks dispatched to them. Having multiple
worker nodes allows you to scale the computing capacity of your cluster.
* **Worker nodes**
Worker nodes receive and execute your services and applications. Having
multiple worker nodes allows you to scale the computing capacity of your
cluster.
When deploying Docker Trusted Registry in your cluster, you deploy it to a
worker node.
## Join nodes to the cluster