Kenneth Lim f5a104dbcd server --> serve

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2015-04-13 22:11:48 +08:00

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page_title: Deploying a registry service page_description: Explains how to deploy a registry service page_keywords: registry, service, images, repository

Deploying a registry service

This section explains how to deploy a Docker Registry Service either privately for your own company or publicly for other users. For example, your company may require a private registry to support your continuous integration (CI) system as it builds new releases or test servers. Alternatively, your company may have a large number of products or services with images you wish to serve in a branded manner.

Docker's public registry maintains a default registry image to assist you in the deployment process. This registry image is sufficient for running local tests but is insufficient for production. For production you should configure and build your own custom registry image from the docker/distribution code.

Simple example with the official image

In this section, you create a local registry using Docker's official image. You push an image to, and then pull the same image from, the registry. This a good exercise for understanding the basic interactions a client has with a local registry.

Install Docker.
Run the hello-world image from the Docker public registry.
```
 $ docker run hello-world
```
The run command automatically pulls the image from Docker's official images.
Start a registry service on your localhost.
```
 $ docker run -p 5000:5000 registry
```
This starts a registry on your DOCKER_HOST running on port 5000.

List your images.

  $ docker images
  REPOSITORY     TAG     IMAGE ID      CREATED       VIRTUAL SIZE
  registry       2.0     bbf0b6ffe923  3 days ago    545.1 MB
  golang         1.4     121a93c90463  5 days ago    514.9 MB
  hello-world    latest  e45a5af57b00  3 months ago  910 B

Your list should include a hello-world image from the earlier run.

Retag the hello-world image for your local repoistory.
```
 $ docker tag hello-world:latest localhost:5000/hello-mine:latest
```
The command labels a hello-world:latest using a new tag in the [REGISTRYHOST/]NAME[:TAG] format. The REGISTRYHOST is this case is localhost. In a Mac OSX environment, you'd substitute $(boot2docker ip):5000 for the localhost.

List your new image.

  $ docker images
  REPOSITORY                  TAG          IMAGE ID      CREATED       VIRTUAL SIZE
  registry                    2.0     bbf0b6ffe923  3 days ago    545.1 MB
  golang                      1.4     121a93c90463  5 days ago    514.9 MB
  hello-world                 latest  e45a5af57b00  3 months ago  910 B		 
  localhost:5000/hello-mine   latest  ef5a5gf57b01  3 months ago  910 B

You should see your new image in your listing.

Push this new image to your local registry.

 $ docker push localhost:5000/hello-mine:latest

Remove all the unused images from your local environment:
```
 $ docker rmi -f $(docker images -q -a )
```
This command is for illustrative purposes; removing the image forces any run to pull from a registry rather than a local cache. If you run docker images after this you should not see any instance of hello-world or hello-mine in your images list.
```
  $ docker images
  REPOSITORY      TAG      IMAGE ID      CREATED       VIRTUAL SIZE
  registry         2.0     bbf0b6ffe923  3 days ago    545.1 MB
  golang           1.4     121a93c90463  5 days ago    514.9 MB
```

Try running hello-mine.

 $ docker run hello-mine
 Unable to find image 'hello-mine:latest' locally
 Pulling repository hello-mine
 FATA[0001] Error: image library/hello-mine:latest not found

The run command fails because your new image doesn't exist in the Docker public registry.

Now, try running the image but specifying the image's registry:
```
 $ docker run localhost:5000/hello-mine
```
If you run docker images after this you'll fine a hello-mine instance.

Making Docker's official registry image production ready

Docker's official image is for simple tests or debugging. Its configuration is unsuitable for most production instances. For example, any client with access to the server's IP can push and pull images to it. See the next section for information on making this image production ready.

Understand production deployment

When deploying a registry for a production deployment you should consider these factors:

backend storage	Where should you store the images?
access and/or authentication	Do users should have full or controlled access? This can depend on whether you are serving images to the public or internally to your company only.
debugging	When problems or issues arise, do you have the means of solving them. Logs are useful as is reporting to see trends.
caching	Quickly retrieving images can be crucial if you are relying on images for tests, builds, or other automated systems.

You can configure your registry features to adjust for these factors. You do this by specifying options on the command line or, more typically, by writing a registry configuration file. The configuration file is in YAML format.

Docker's official repository image it is preconfigured using the following configuration file:

version: 0.1
log:
  level: debug
  fields:
    service: registry
    environment: development
storage:
  cache:
      layerinfo: inmemory
  filesystem:
      rootdirectory: /tmp/registry-dev
http:
  addr: :5000
  secret: asecretforlocaldevelopment
  debug:
      addr: localhost:5001
redis:
  addr: localhost:6379
  pool:
    maxidle: 16
    maxactive: 64
    idletimeout: 300s
  dialtimeout: 10ms
  readtimeout: 10ms
  writetimeout: 10ms
notifications:
  endpoints:
      - name: local-8082
        url: http://localhost:5003/callback
        headers:
           Authorization: [Bearer <an example token>]
        timeout: 1s
        threshold: 10
        backoff: 1s
        disabled: true
      - name: local-8083
        url: http://localhost:8083/callback
        timeout: 1s
        threshold: 10
        backoff: 1s
        disabled: true

This configuration is very basic and you can see it would present some problems in a production. For example, the http section details the configuration for the HTTP server that hosts the registry. The server is not using even the most minimal transport layer security (TLS). Let's configure that in the next section.

Configure TLS on a registry server

In this section, you configure TLS on the server to enable communication through the https protocol. Enabling TLS on the server is the minimum layer of security recommended for running a registry behind a corporate firewall. The easiest way to do this is to build your own registry image.

Download the registry source and generated certificates

Download the registry source.

Alternatively, use the git clone command if you are more comfortable with that.
Unpack the the downloaded package into a local directory.

The package creates a distribution directory.
Change to the root of the new distribution directory.
```
 $ cd distribution
```
Make a certs subdirectory.
```
 $ mkdir certs
```

Use SSL to generate some self-signed certificates.

 $ openssl req \
 		 -newkey rsa:2048 -nodes -keyout certs/domain.key \
 		 -x509 -days 365 -out certs/domain.crt

Add the certificates to the image

In this section, you copy the certifications from your certs directory into your base image.

Edit the Dockerfile and add a CERTS_PATH environment variable.
```
 ENV CERTS_PATH  /etc/docker/registry/certs
```
Add a line to make the CERTS_PATH in the filesystem.
```
 RUN mkdir -v $CERTS_PATH
```

Add RUN instructions to hard link your new certifications into this path:

 RUN cp -lv ./certs/domain.crt $CERTS_PATH
 RUN cp -lv ./certs/domain.key $CERTS_PATH

 This copies your certifications into your container.

Save your work.

At this point your Dockerfile should look like the following:

 FROM golang:1.4

 ENV CONFIG_PATH /etc/docker/registry/config.yml
 ENV CERTS_PATH	/etc/docker/registry/certs
 ENV DISTRIBUTION_DIR /go/src/github.com/docker/distribution
 ENV GOPATH $DISTRIBUTION_DIR/Godeps/_workspace:$GOPATH

 WORKDIR $DISTRIBUTION_DIR
 COPY . $DISTRIBUTION_DIR
 RUN make PREFIX=/go clean binaries
 RUN mkdir -pv "$(dirname $CONFIG_PATH)"
 RUN mkdir -v $CERTS_PATH
 RUN cp -lv ./certs/domain.crt $CERTS_PATH
 RUN cp -lv ./certs/domain.key $CERTS_PATH
 RUN cp -lv ./cmd/registry/config.yml $CONFIG_PATH

Before you close the Dockerfile look for an instruction to copy the config.yml file.
```
 RUN cp -lv ./cmd/registry/config.yml $CONFIG_PATH
```
This is the default registry configuration file. You'll need to edit the file to add TLS.

Add TLS to the registry configuration

Edit the ./cmd/registry/config.yml file.
```
 $ vi ./cmd/registry/config.yml 
```

Locate the http block.

 http:
 		addr: :5000
 		secret: asecretforlocaldevelopment
 		debug:
 				addr: localhost:5001

Add a tls block for the server's self-signed certificates:

 http:
 		addr: :5000
 		secret: asecretforlocaldevelopment
 		debug:
 				addr: localhost:5001
 		tls:
 			certificate: /etc/docker/registry/certs/domain.crt
 			key: /etc/docker/registry/certs/domain.key

You provide the paths to the certificates in the container. If you want two-way authentication across the layer, you can add an optional clientcas section.

Save and close the file.

Run your new image

Build your registry image.
```
 $ docker build -t secure_registry .
```

Run your new image.

 $ docker run -p 5000:5000 secure_registry

 Watch the messages at startup. You should see that `tls` is running:

 ubuntu@ip-172-31-34-181:~/repos/distribution$ docker run -p 5000:5000 secure_registry
 time="2015-04-05T23:56:47Z" level=info msg="endpoint local-8082 disabled, skipping" app.id=3dd802ad-3bd4-4413-b56d-90c4acff41c7 environment=development service=registry 
 time="2015-04-05T23:56:47Z" level=info msg="endpoint local-8083 disabled, skipping" app.id=3dd802ad-3bd4-4413-b56d-90c4acff41c7 environment=development service=registry 
 time="2015-04-05T23:56:47Z" level=info msg="using inmemory layerinfo cache" app.id=3dd802ad-3bd4-4413-b56d-90c4acff41c7 environment=development service=registry 
 time="2015-04-05T23:56:47Z" level=info msg="listening on :5000, tls" app.id=3dd802ad-3bd4-4413-b56d-90c4acff41c7 environment=development service=registry 
 time="2015-04-05T23:56:47Z" level=info msg="debug server listening localhost:5001" 
 2015/04/05 23:57:23 http: TLS handshake error from 172.17.42.1:52057: remote error: unknown certificate authority

Use curl to verify that you can connect over https.
```
 $ curl https://localhost:5000
```

Adding a middleware configuration

This section describes how to configure storage middleware in a registry. Middleware allows the registry to server layers via a content delivery network (CDN). This is useful for reducing requests to the storage layer.

Currently, the registry supports Amazon Cloudfront. You can only use Cloudfront in conjunction with the S3 storage driver.

Parameter	Description
`name`	The storage middleware name. Currently `cloudfront` is an accepted value.
`disabled`	Set to `false` to easily disable the middleware.
`options:`	A set of key/value options to configure the middleware. `baseurl:` The Cloudfront base URL. `privatekey:` The location of your AWS private key on the filesystem. `keypairid:` The ID of your Cloudfront keypair. `duration:` The duration in minutes for which the URL is valid. Default is 20.

The following example illustrates these values:

middleware:
    storage:
        - name: cloudfront
          disabled: false
          options:
             baseurl: http://d111111abcdef8.cloudfront.net
             privatekey: /path/to/asecret.pem
             keypairid: asecret
             duration: 60

Note

[the documentation on AWS credentials](http://docs.aws.amazon.com/AWSSecurityCredentials/1.0/ AboutAWSCredentials.html#KeyPairs) for more information.

**TODO(stevvooe): Need a "best practice" configuration overview. Perhaps, we can point to a documentation section.

Configure nginx to deploy alongside v1 registry

This sections describes how to configure nginx to proxy to both a v1 and v2 registry. Nginx will handle routing of to the correct registry based on the URL and Docker client version.

Example configuration

With v1 registry running at localhost:5001 and v2 registry running at localhost:5002. Add this to /etc/nginx/conf.d/registry.conf.

server {
  listen 5000;
  server_name localhost;

  ssl on;
  ssl_certificate /etc/docker/registry/certs/domain.crt;
  ssl_certificate_key /etc/docker/registry/certs/domain.key;

  client_max_body_size 0; # disable any limits to avoid HTTP 413 for large image uploads

  # required to avoid HTTP 411: see Issue #1486 (https://github.com/docker/docker/issues/1486)
  chunked_transfer_encoding on;

  location /v2/ {
    # Do not allow connections from docker 1.5 and earlier
    # docker pre-1.6.0 did not properly set the user agent on ping, catch "Go *" user agents
    if ($http_user_agent ~ "^(docker\/1\.(3|4|5(?!\.[0-9]-dev))|Go ).*$" ) {
      return 404;
    }

    proxy_pass                       http://localhost:5002;
    proxy_set_header  Host           $http_host;   # required for docker client's sake
    proxy_set_header  X-Real-IP      $remote_addr; # pass on real client's IP
    proxy_read_timeout               900;
  }

  location / {
    proxy_pass                       http://localhost:5001;
    proxy_set_header  Host           $http_host;   # required for docker client's sake
    proxy_set_header  X-Real-IP      $remote_addr; # pass on real client's IP
    proxy_set_header  Authorization  ""; # see https://github.com/docker/docker-registry/issues/170
    proxy_read_timeout               900;
  }
}

Running nginx without a v1 registry

When running a v2 registry behind nginx without a v1 registry, the /v1/ endpoint should be explicitly configured to return a 404 if only the /v2/ route is proxied. This is needed due to the v1 registry fallback logic within Docker 1.5 and 1.6 which will attempt to retrieve content from the v1 endpoint if no content was retrieved from v2.

Add this location block to explicitly block v1 requests.

localhost /v1/ {
	return 404;
}

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