The Registry configuration is based on a YAML file, detailed below. While it comes with sane default values out of the box, you are heavily encouraged to review it exhaustively before moving your systems to production.
In a typical setup where you run your Registry from the official image, you can specify any configuration variable from the environment by passing -e arguments to your docker run stanza, or from within a Dockerfile using the ENV instruction.
To override a configuration option, create an environment variable named
REGISTRY_variable where variable is the name of the configuration option
and the _ (underscore) represents indention levels. For example, you can
configure the rootdirectory of the filesystem storage backend:
storage:
filesystem:
rootdirectory: /var/lib/registry
To override this value, set an environment variable like this:
REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY=/somewhere
This variable overrides the /var/lib/registry value to the /somewhere
directory.
Note: If an environment variable changes a map value into a string, such as replacing the storage driver type with
REGISTRY_STORAGE=filesystem, then all sub-fields will be erased. As such, specifying the storage type in the environment will remove all parameters related to the old storage configuration.
This section lists all the registry configuration options. Some options in the list are mutually exclusive. So, make sure to read the detailed reference information about each option that appears later in this page.
version: 0.1
log:
level: debug
formatter: text
fields:
service: registry
environment: staging
hooks:
- type: mail
disabled: true
levels:
- panic
options:
smtp:
addr: mail.example.com:25
username: mailuser
password: password
insecure: true
from: sender@example.com
to:
- errors@example.com
loglevel: debug # deprecated: use "log"
storage:
filesystem:
rootdirectory: /var/lib/registry
azure:
accountname: accountname
accountkey: base64encodedaccountkey
container: containername
s3:
accesskey: awsaccesskey
secretkey: awssecretkey
region: us-west-1
bucket: bucketname
encrypt: true
secure: true
v4auth: true
chunksize: 5242880
rootdirectory: /s3/object/name/prefix
rados:
poolname: radospool
username: radosuser
chunksize: 4194304
cache:
blobdescriptor: redis
maintenance:
uploadpurging:
enabled: true
age: 168h
interval: 24h
dryrun: false
auth:
silly:
realm: silly-realm
service: silly-service
token:
realm: token-realm
service: token-service
issuer: registry-token-issuer
rootcertbundle: /root/certs/bundle
htpasswd:
realm: basic-realm
path: /path/to/htpasswd
middleware:
registry:
- name: ARegistryMiddleware
options:
foo: bar
repository:
- name: ARepositoryMiddleware
options:
foo: bar
storage:
- name: cloudfront
options:
baseurl: https://my.cloudfronted.domain.com/
privatekey: /path/to/pem
keypairid: cloudfrontkeypairid
duration: 3000
reporting:
bugsnag:
apikey: bugsnagapikey
releasestage: bugsnagreleasestage
endpoint: bugsnagendpoint
newrelic:
licensekey: newreliclicensekey
name: newrelicname
verbose: true
http:
addr: localhost:5000
prefix: /my/nested/registry/
secret: asecretforlocaldevelopment
tls:
certificate: /path/to/x509/public
key: /path/to/x509/private
clientcas:
- /path/to/ca.pem
- /path/to/another/ca.pem
debug:
addr: localhost:5001
notifications:
endpoints:
- name: alistener
disabled: false
url: https://my.listener.com/event
headers: <http.Header>
timeout: 500
threshold: 5
backoff: 1000
redis:
addr: localhost:6379
password: asecret
db: 0
dialtimeout: 10ms
readtimeout: 10ms
writetimeout: 10ms
pool:
maxidle: 16
maxactive: 64
idletimeout: 300sIn some instances a configuration option is optional but it contains child options marked as required. This indicates that you can omit the parent with all its children. However, if the parent is included, you must also include all the children marked required.
version: 0.1The version option is required. It specifies the configuration's version.
It is expected to remain a top-level field, to allow for a consistent version
check before parsing the remainder of the configuration file.
The log subsection configures the behavior of the logging system. The logging
system outputs everything to stdout. You can adjust the granularity and format
with this configuration section.
log:
level: debug
formatter: text
fields:
service: registry
environment: staging| Parameter | Required | Description |
|---|---|---|
level
|
no |
Sets the sensitivity of logging output. Permitted values are
error, warn, info and
debug. The default is info.
|
formatter
|
no |
This selects the format of logging output. The format primarily affects how keyed
attributes for a log line are encoded. Options are text, json or
logstash. The default is text.
|
fields
|
no | A map of field names to values. These are added to every log line for the context. This is useful for identifying log messages source after being mixed in other systems. |
hooks:
- type: mail
levels:
- panic
options:
smtp:
addr: smtp.sendhost.com:25
username: sendername
password: password
insecure: true
from: name@sendhost.com
to:
- name@receivehost.comThe hooks subsection configures the logging hooks' behavior. This subsection
includes a sequence handler which you can use for sending mail, for example.
Refer to loglevel to configure the level of messages printed.
DEPRECATED: Please use log instead.
loglevel: debugPermitted values are error, warn, info and debug. The default is
info.
storage:
filesystem:
rootdirectory: /var/lib/registry
azure:
accountname: accountname
accountkey: base64encodedaccountkey
container: containername
s3:
accesskey: awsaccesskey
secretkey: awssecretkey
region: us-west-1
bucket: bucketname
encrypt: true
secure: true
v4auth: true
chunksize: 5242880
rootdirectory: /s3/object/name/prefix
rados:
poolname: radospool
username: radosuser
chunksize: 4194304
cache:
blobdescriptor: inmemory
maintenance:
uploadpurging:
enabled: true
age: 168h
interval: 24h
dryrun: falseThe storage option is required and defines which storage backend is in use. You must configure one backend; if you configure more, the registry returns an error.
If you are deploying a registry on Windows, be aware that a Windows volume mounted from the host is not recommended. Instead, you can use a S3, or Azure, backing data-store. If you do use a Windows volume, you must ensure that the PATH to the mount point is within Window's MAX_PATH limits. Failure to do so can result in the following error message:
mkdir /XXX protocol error and your registry will not function properly.
Use the cache subsection to enable caching of data accessed in the storage
backend. Currently, the only available cache provides fast access to layer
metadata. This, if configured, uses the blobdescriptor field.
You can set blobdescriptor field to redis or inmemory. The redis value uses
a Redis pool to cache layer metadata. The inmemory value uses an in memory
map.
NOTE: Formerly,
blobdescriptorwas known aslayerinfo. While these are equivalent,layerinfohas been deprecated, in favor orblobdescriptor.
The filesystem storage backend uses the local disk to store registry files. It
is ideal for development and may be appropriate for some small-scale production
applications.
This backend has a single, required rootdirectory parameter. The parameter
specifies the absolute path to a directory. The registry stores all its data
here so make sure there is adequate space available.
This storage backend uses Microsoft's Azure Blob Storage.
| Parameter | Required | Description |
|---|---|---|
accountname
|
yes | Azure account name. |
accountkey
|
yes | Azure account key. |
container
|
yes | Name of the Azure container into which to store data. |
realm
|
no |
Domain name suffix for the Storage Service API endpoint. By default, this
is core.windows.net.
|
This storage backend uses Ceph Object Storage.
| Parameter | Required | Description |
|---|---|---|
poolname
|
yes | Ceph pool name. |
username
|
no | Ceph cluster user to connect as (i.e. admin, not client.admin). |
chunksize
|
no | Size of the written RADOS objects. Default value is 4MB (4194304). |
This storage backend uses Amazon's Simple Storage Service (S3).
| Parameter | Required | Description |
|---|---|---|
accesskey
|
yes | Your AWS Access Key. |
secretkey
|
yes | Your AWS Secret Key. |
region
|
yes | The AWS region in which your bucket exists. For the moment, the Go AWS library in use does not use the newer DNS based bucket routing. |
bucket
|
yes | The bucket name in which you want to store the registry's data. |
encrypt
|
no | Specifies whether the registry stores the image in encrypted format or not. A boolean value. The default is false. |
secure
|
no | Indicates whether to use HTTPS instead of HTTP. A boolean value. The default is false. |
v4auth
|
no |
Indicates whether the registry uses Version 4 of AWS's authentication.
Generally, you should set this to true. By default, this is
false.
|
chunksize
|
no | The S3 API requires multipart upload chunks to be at least 5MB. This value should be a number that is larger than 5*1024*1024. |
rootdirectory
|
no | This is a prefix that will be applied to all S3 keys to allow you to segment data in your bucket if necessary. |
Currently the registry can perform one maintenance function: upload purging. This and future maintenance functions which are related to storage can be configured under the maintenance section.
Upload purging is a background process that periodically removes orphaned files from the upload directories of the registry. Upload purging is enabled by default. To configure upload directory purging, the following parameters must be set.
| Parameter | Required | Description |
|---|---|---|
enabled |
yes | Set to true to enable upload purging. Default=true. |
age |
yes | Upload directories which are older than this age will be deleted. Default=168h (1 week) |
interval |
yes | The interval between upload directory purging. Default=24h. |
dryrun |
yes | dryrun can be set to true to obtain a summary of what directories will be deleted. Default=false. |
Note: age and interval are strings containing a number with optional fraction and a unit suffix: e.g. 45m, 2h10m, 168h (1 week).
auth:
silly:
realm: silly-realm
service: silly-service
token:
realm: token-realm
service: token-service
issuer: registry-token-issuer
rootcertbundle: /root/certs/bundle
htpasswd:
realm: basic-realm
path: /path/to/htpasswdThe auth option is optional. There are
currently 2 possible auth providers, silly and token. You can configure only
one auth provider.
The silly auth is only for development purposes. It simply checks for the
existence of the Authorization header in the HTTP request. It has no regard for
the header's value. If the header does not exist, the silly auth responds with a
challenge response, echoing back the realm, service, and scope that access was
denied for.
The following values are used to configure the response:
| Parameter | Required | Description |
|---|---|---|
realm
|
yes | The realm in which the registry server authenticates. |
service
|
yes | The service being authenticated. |
Token based authentication allows the authentication system to be decoupled from the registry. It is a well established authentication paradigm with a high degree of security.
| Parameter | Required | Description |
|---|---|---|
realm
|
yes | The realm in which the registry server authenticates. |
service
|
yes | The service being authenticated. |
issuer
|
yes | The name of the token issuer. The issuer inserts this into the token so it must match the value configured for the issuer. |
rootcertbundle
|
yes | The absolute path to the root certificate bundle. This bundle contains the public part of the certificates that is used to sign authentication tokens. |
For more information about Token based authentication configuration, see the [specification.]
The htpasswd authentication backed allows one to configure basic auth using an
Apache HTPasswd File.
Only bcrypt format passwords are
supported. Entries with other hash types will be ignored. The htpasswd file is
loaded once, at startup. If the file is invalid, the registry will display and
error and will not start.
WARNING: This authentication scheme should only be used with TLS configured, since basic authentication sends passwords as part of the http header.
| Parameter | Required | Description |
|---|---|---|
realm
|
yes | The realm in which the registry server authenticates. |
path
|
yes | Path to htpasswd file to load at startup. |
The middleware option is optional. Use this option to inject middleware at
named hook points. All middlewares must implement the same interface as the
object they're wrapping. This means a registry middleware must implement the
distribution.Namespace interface, repository middleware must implement
distribution.Respository, and storage middleware must implement
driver.StorageDriver.
Currently only one middleware, cloudfront, a storage middleware, is supported
in the registry implementation.
middleware:
registry:
- name: ARegistryMiddleware
options:
foo: bar
repository:
- name: ARepositoryMiddleware
options:
foo: bar
storage:
- name: cloudfront
options:
baseurl: https://my.cloudfronted.domain.com/
privatekey: /path/to/pem
keypairid: cloudfrontkeypairid
duration: 3000Each middleware entry has name and options entries. The name must
correspond to the name under which the middleware registers itself. The
options field is a map that details custom configuration required to
initialize the middleware. It is treated as a map[string]interface{}. As such,
it supports any interesting structures desired, leaving it up to the middleware
initialization function to best determine how to handle the specific
interpretation of the options.
| Parameter | Required | Description |
|---|---|---|
baseurl
|
yes |
SCHEME://HOST[/PATH] at which Cloudfront is served.
|
privatekey
|
yes | Private Key for Cloudfront provided by AWS. |
keypairid
|
yes | Key pair ID provided by AWS. |
duration
|
no | Duration for which a signed URL should be valid. |
reporting:
bugsnag:
apikey: bugsnagapikey
releasestage: bugsnagreleasestage
endpoint: bugsnagendpoint
newrelic:
licensekey: newreliclicensekey
name: newrelicname
verbose: trueThe reporting option is optional and configures error and metrics
reporting tools. At the moment only two services are supported, New
Relic and Bugsnag, a valid
configuration may contain both.
| Parameter | Required | Description |
|---|---|---|
apikey
|
yes | API Key provided by Bugsnag |
releasestage
|
no | Tracks where the registry is deployed, for example, production,staging, or development. |
endpoint
|
no | Specify the enterprise Bugsnag endpoint. |
| Parameter | Required | Description |
|---|---|---|
licensekey
|
yes | License key provided by New Relic. |
name
|
no | New Relic application name. |
verbose
|
no | Enable New Relic debugging output on stdout. |
http:
addr: localhost:5000
net: tcp
prefix: /my/nested/registry/
secret: asecretforlocaldevelopment
tls:
certificate: /path/to/x509/public
key: /path/to/x509/private
clientcas:
- /path/to/ca.pem
- /path/to/another/ca.pem
debug:
addr: localhost:5001The http option details the configuration for the HTTP server that hosts the registry.
| Parameter | Required | Description |
|---|---|---|
addr
|
yes |
The address for which the server should accept connections. The form depends on a network type (see net option):
HOST:PORT for tcp and FILE for a unix socket.
|
net
|
no |
The network which is used to create a listening socket. Known networks are unix and tcp.
The default empty value means tcp.
|
prefix
|
no |
If the server does not run at the root path use this value to specify the
prefix. The root path is the section before v2. It
should have both preceding and trailing slashes, for example /path/.
|
secret
|
yes | A random piece of data. This is used to sign state that may be stored with the client to protect against tampering. For production environments you should generate a random piece of data using a cryptographically secure random generator. |
The tls struct within http is optional. Use this to configure TLS
for the server. If you already have a server such as Nginx or Apache running on
the same host as the registry, you may prefer to configure TLS termination there
and proxy connections to the registry server.
| Parameter | Required | Description |
|---|---|---|
certificate
|
yes | Absolute path to x509 cert file |
key
|
yes | Absolute path to x509 private key file. |
clientcas
|
no | An array of absolute paths to a x509 CA file |
The debug option is optional . Use it to configure a debug server that
can be helpful in diagnosing problems. The debug endpoint can be used for
monitoring registry metrics and health, as well as profiling. Sensitive
information may be available via the debug endpoint. Please be certain that
access to the debug endpoint is locked down in a production environment.
The debug section takes a single, required addr parameter. This parameter
specifies the HOST:PORT on which the debug server should accept connections.
notifications:
endpoints:
- name: alistener
disabled: false
url: https://my.listener.com/event
headers: <http.Header>
timeout: 500
threshold: 5
backoff: 1000The notifications option is optional and currently may contain a single
option, endpoints.
Endpoints is a list of named services (URLs) that can accept event notifications.
| Parameter | Required | Description |
|---|---|---|
name
|
yes | A human readable name for the service. |
disabled
|
no | A boolean to enable/disable notifications for a service. |
url
|
yes | The URL to which events should be published. |
headers
|
yes | Static headers to add to each request. |
timeout
|
yes |
An HTTP timeout value. This field takes a positive integer and an optional
suffix indicating the unit of time. Possible units are:
|
threshold
|
yes | An integer specifying how long to wait before backing off a failure. |
backoff
|
yes |
How long the system backs off before retrying. This field takes a positive
integer and an optional suffix indicating the unit of time. Possible units
are:
|
redis:
addr: localhost:6379
password: asecret
db: 0
dialtimeout: 10ms
readtimeout: 10ms
writetimeout: 10ms
pool:
maxidle: 16
maxactive: 64
idletimeout: 300sDeclare parameters for constructing the redis connections. Registry instances may use the Redis instance for several applications. The current purpose is caching information about immutable blobs. Most of the options below control how the registry connects to redis. You can control the pool's behavior with the pool subsection.
| Parameter | Required | Description |
|---|---|---|
addr
|
yes | Address (host and port) of redis instance. |
password
|
no | A password used to authenticate to the redis instance. |
db
|
no | Selects the db for each connection. |
dialtimeout
|
no | Timeout for connecting to a redis instance. |
readtimeout
|
no | Timeout for reading from redis connections. |
writetimeout
|
no | Timeout for writing to redis connections. |
pool:
maxidle: 16
maxactive: 64
idletimeout: 300sConfigure the behavior of the Redis connection pool.
| Parameter | Required | Description |
|---|---|---|
maxidle
|
no | Sets the maximum number of idle connections. |
maxactive
|
no | sets the maximum number of connections that should be opened before blocking a connection request. |
idletimeout
|
no | sets the amount time to wait before closing inactive connections. |
The following is a simple example you can use for local development:
version: 0.1
log:
level: debug
storage:
filesystem:
rootdirectory: /var/lib/registry
http:
addr: localhost:5000
secret: asecretforlocaldevelopment
debug:
addr: localhost:5001The above configures the registry instance to run on port 5000, binding to
localhost, with the debug server enabled. Registry data storage is in the
/var/lib/registry directory. Logging is in debug mode, which is the most
verbose.
A similar simple configuration is available at config.yml. Both are generally useful for local development.
This example illustrates how to configure storage middleware in a registry. Middleware allows the registry to serve 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.
|
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: Cloudfront keys exist separately to other AWS keys. See the documentation on AWS credentials for more information.