--- description: Explains how to configure a registry keywords: registry, on-prem, images, tags, repository, distribution, configuration title: Registry configuration reference --- 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. ## Override specific configuration options In a typical setup where you run your Registry from the official image, you can specify a 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**: It is highly recommended to create a base configuration file with which environment variables can be used to tweak individual values. Overriding configuration sections with environment variables is not recommended. ## Overriding the entire configuration file If the default configuration is not a sound basis for your usage, or if you are having issues overriding keys from the environment, you can specify an alternate YAML configuration file by mounting it as a volume in the container. Typically, create a new configuration file from scratch, and call it `config.yml`, then: docker run -d -p 5000:5000 --restart=always --name registry \ -v `pwd`/config.yml:/etc/docker/registry/config.yml \ registry:2 You can (and probably should) use [this as a starting point](https://github.com/docker/distribution/blob/master/cmd/registry/config-example.yml). ## List of configuration options 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 maxthreads: 100 azure: accountname: accountname accountkey: base64encodedaccountkey container: containername gcs: bucket: bucketname keyfile: /path/to/keyfile rootdirectory: /gcs/object/name/prefix chunksize: 5242880 s3: accesskey: awsaccesskey secretkey: awssecretkey region: us-west-1 regionendpoint: http://myobjects.local bucket: bucketname encrypt: true keyid: mykeyid secure: true v4auth: true chunksize: 5242880 rootdirectory: /s3/object/name/prefix swift: username: username password: password authurl: https://storage.myprovider.com/auth/v1.0 or https://storage.myprovider.com/v2.0 or https://storage.myprovider.com/v3/auth tenant: tenantname tenantid: tenantid domain: domain name for Openstack Identity v3 API domainid: domain id for Openstack Identity v3 API insecureskipverify: true region: fr container: containername rootdirectory: /swift/object/name/prefix oss: accesskeyid: accesskeyid accesskeysecret: accesskeysecret region: OSS region name endpoint: optional endpoints internal: optional internal endpoint bucket: OSS bucket encrypt: optional data encryption setting secure: optional ssl setting chunksize: optional size valye rootdirectory: optional root directory inmemory: # This driver takes no parameters delete: enabled: false redirect: disable: false cache: blobdescriptor: redis maintenance: uploadpurging: enabled: true age: 168h interval: 24h dryrun: false readonly: enabled: 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: 3000s storage: - name: redirect options: baseurl: https://example.com/ reporting: bugsnag: apikey: bugsnagapikey releasestage: bugsnagreleasestage endpoint: bugsnagendpoint newrelic: licensekey: newreliclicensekey name: newrelicname verbose: true http: addr: localhost:5000 prefix: /my/nested/registry/ host: https://myregistryaddress.org:5000 secret: asecretforlocaldevelopment relativeurls: false tls: certificate: /path/to/x509/public key: /path/to/x509/private clientcas: - /path/to/ca.pem - /path/to/another/ca.pem letsencrypt: cachefile: /path/to/cache-file email: emailused@letsencrypt.com debug: addr: localhost:5001 headers: X-Content-Type-Options: [nosniff] notifications: endpoints: - name: alistener disabled: false url: https://my.listener.com/event headers: 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: 300s health: storagedriver: enabled: true interval: 10s threshold: 3 file: - file: /path/to/checked/file interval: 10s http: - uri: http://server.to.check/must/return/200 headers: Authorization: [Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==] statuscode: 200 timeout: 3s interval: 10s threshold: 3 tcp: - addr: redis-server.domain.com:6379 timeout: 3s interval: 10s threshold: 3 proxy: remoteurl: https://registry-1.docker.io username: [username] password: [password] compatibility: schema1: signingkeyfile: /etc/registry/key.json In 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 version: 0.1 The `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. ## log 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 ``` 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.com ``` The `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. ## loglevel > **DEPRECATED:** Please use [log](configuration.md#log) instead. loglevel: debug Permitted values are `error`, `warn`, `info` and `debug`. The default is `info`. ## storage storage: filesystem: rootdirectory: /var/lib/registry azure: accountname: accountname accountkey: base64encodedaccountkey container: containername gcs: bucket: bucketname keyfile: /path/to/keyfile rootdirectory: /gcs/object/name/prefix s3: accesskey: awsaccesskey secretkey: awssecretkey region: us-west-1 regionendpoint: http://myobjects.local bucket: bucketname encrypt: true keyid: mykeyid secure: true v4auth: true chunksize: 5242880 rootdirectory: /s3/object/name/prefix swift: username: username password: password authurl: https://storage.myprovider.com/auth/v1.0 or https://storage.myprovider.com/v2.0 or https://storage.myprovider.com/v3/auth tenant: tenantname tenantid: tenantid domain: domain name for Openstack Identity v3 API domainid: domain id for Openstack Identity v3 API insecureskipverify: true region: fr container: containername rootdirectory: /swift/object/name/prefix oss: accesskeyid: accesskeyid accesskeysecret: accesskeysecret region: OSS region name endpoint: optional endpoints internal: optional internal endpoint bucket: OSS bucket encrypt: optional data encryption setting secure: optional ssl setting chunksize: optional size valye rootdirectory: optional root directory inmemory: delete: enabled: false cache: blobdescriptor: inmemory maintenance: uploadpurging: enabled: true age: 168h interval: 24h dryrun: false redirect: disable: false The 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. You can choose any of these backend storage drivers: | Storage driver | Description | ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | `filesystem` | Uses the local disk to store registry files. It is ideal for development and may be appropriate for some small-scale production applications. See the [driver's reference documentation](storage-drivers/filesystem.md). | | `azure` | Uses Microsoft's Azure Blob Storage. See the [driver's reference documentation](storage-drivers/azure.md). | | `gcs` | Uses Google Cloud Storage. See the [driver's reference documentation](storage-drivers/gcs.md). | | `s3` | Uses Amazon's Simple Storage Service (S3) and compatible Storage Services. See the [driver's reference documentation](storage-drivers/s3.md). | | `swift` | Uses Openstack Swift object storage. See the [driver's reference documentation](storage-drivers/swift.md). | | `oss` | Uses Aliyun OSS for object storage. See the [driver's reference documentation](storage-drivers/oss.md). | For purely tests purposes, you can use the [`inmemory` storage driver](storage-drivers/inmemory.md). If you would like to run a registry from volatile memory, use the [`filesystem` driver](storage-drivers/filesystem.md) on a ramdisk. 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 Windows' `MAX_PATH` limits (typically 255 characters). Failure to do so can result in the following error message: mkdir /XXX protocol error and your registry will not function properly. ### Maintenance Currently upload purging and read-only mode are the only maintenance functions available. These and future maintenance functions which are related to storage can be configured under the maintenance section. ### Upload Purging 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). ### Read-only mode If the `readonly` section under `maintenance` has `enabled` set to `true`, clients will not be allowed to write to the registry. This mode is useful to temporarily prevent writes to the backend storage so a garbage collection pass can be run. Before running garbage collection, the registry should be restarted with readonly's `enabled` set to true. After the garbage collection pass finishes, the registry may be restarted again, this time with `readonly` removed from the configuration (or set to false). ### delete Use the `delete` subsection to enable the deletion of image blobs and manifests by digest. It defaults to false, but it can be enabled by writing the following on the configuration file: delete: enabled: true ### cache 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, `blobdescriptor` was known as `layerinfo`. While these >are equivalent, `layerinfo` has been deprecated, in favor or >`blobdescriptor`. ### redirect The `redirect` subsection provides configuration for managing redirects from content backends. For backends that support it, redirecting is enabled by default. Certain deployment scenarios may prefer to route all data through the Registry, rather than redirecting to the backend. This may be more efficient when using a backend that is not co-located or when a registry instance is doing aggressive caching. Redirects can be disabled by adding a single flag `disable`, set to `true` under the `redirect` section: redirect: disable: true ## auth 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 The `auth` option is **optional**. There are currently 3 possible auth providers, `silly`, `token` and `htpasswd`. You can configure only one `auth` provider. ### silly 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 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](spec/auth/token.md). ### htpasswd The _htpasswd_ authentication backed allows one to configure basic auth using an [Apache htpasswd file](https://httpd.apache.org/docs/2.4/programs/htpasswd.html). Only [`bcrypt`](http://en.wikipedia.org/wiki/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 an 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.
## middleware The `middleware` option is **optional**. Use this option to inject middleware at named hook points. All middleware 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.Repository`, and storage middleware must implement `driver.StorageDriver`. An example configuration of the `cloudfront` middleware, a storage middleware: 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: 3000s Each 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. ### cloudfront
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 {% capture text %}Specify a `duration` by providing an integer and a unit. Valid time units are `ns`, `us` (or `µs`), `ms`, `s`, `m`, `h`. For example, `3000s` is a valid duration; there should be no space between the integer and unit. If you do not specify a `duration` or specify an integer without a time unit, this defaults to 20 minutes.{% endcapture %} {{ text | markdownify }}
### redirect In place of the `cloudfront` storage middleware, the `redirect` storage middleware can be used to specify a custom URL to a location of a proxy for the layer stored by the S3 storage driver. | Parameter | Required | Description | | --- | --- | --- | | baseurl | yes | `SCHEME://HOST` at which layers are served. Can also contain port. For example, `https://example.com:5443`. | ## reporting reporting: bugsnag: apikey: bugsnagapikey releasestage: bugsnagreleasestage endpoint: bugsnagendpoint newrelic: licensekey: newreliclicensekey name: newrelicname verbose: true The `reporting` option is **optional** and configures error and metrics reporting tools. At the moment only two services are supported, [New Relic](http://newrelic.com/) and [Bugsnag](http://bugsnag.com), a valid configuration may contain both. ### bugsnag
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.
### newrelic
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 http: addr: localhost:5000 net: tcp prefix: /my/nested/registry/ host: https://myregistryaddress.org:5000 secret: asecretforlocaldevelopment relativeurls: false tls: certificate: /path/to/x509/public key: /path/to/x509/private clientcas: - /path/to/ca.pem - /path/to/another/ca.pem letsencrypt: cachefile: /path/to/cache-file email: emailused@letsencrypt.com debug: addr: localhost:5001 headers: X-Content-Type-Options: [nosniff] The `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/.
host no This parameter specifies an externally-reachable address for the registry, as a fully qualified URL. If present, it is used when creating generated URLs. Otherwise, these URLs are derived from client requests.
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. This configuration parameter may be omitted, in which case the registry will automatically generate a secret at launch.

WARNING: If you are building a cluster of registries behind a load balancer, you MUST ensure the secret is the same for all registries.

relativeurls no Specifies that the registry should return relative URLs in Location headers. The client is responsible for resolving the correct URL. This option is not compatible with Docker 1.7 and earlier.
### tls 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 an x509 CA file
### letsencrypt The `letsencrypt` struct within `tls` is **optional**. Use this to configure TLS certificates provided by [Let's Encrypt](https://letsencrypt.org/how-it-works/).
Parameter Required Description
cachefile yes Absolute path to a file for the Let's Encrypt agent to cache data
email yes Email used to register with Let's Encrypt.
### debug 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. ### headers The `headers` option is **optional** . Use it to specify headers that the HTTP server should include in responses. This can be used for security headers such as `Strict-Transport-Security`. The `headers` option should contain an option for each header to include, where the parameter name is the header's name, and the parameter value a list of the header's payload values. Including `X-Content-Type-Options: [nosniff]` is recommended, so that browsers will not interpret content as HTML if they are directed to load a page from the registry. This header is included in the example configuration files. ## notifications notifications: endpoints: - name: alistener disabled: false url: https://my.listener.com/event headers: timeout: 500 threshold: 5 backoff: 1000 The notifications option is **optional** and currently may contain a single option, `endpoints`. ### 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. Each header's name should be a key underneath headers, and each value is a list of payloads for that header name. Note that values must always be lists.
timeout yes An HTTP timeout value. This field takes a positive integer and an optional suffix indicating the unit of time. Possible units are:
  • ns (nanoseconds)
  • us (microseconds)
  • ms (milliseconds)
  • s (seconds)
  • m (minutes)
  • h (hours)
If you omit the suffix, the system interprets the value as nanoseconds.
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:
  • ns (nanoseconds)
  • us (microseconds)
  • ms (milliseconds)
  • s (seconds)
  • m (minutes)
  • h (hours)
If you omit the suffix, the system interprets the value as nanoseconds.
## redis redis: addr: localhost:6379 password: asecret db: 0 dialtimeout: 10ms readtimeout: 10ms writetimeout: 10ms pool: maxidle: 16 maxactive: 64 idletimeout: 300s Declare 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](configuration.md#pool) subsection. It's advisable to configure Redis itself with the **allkeys-lru** eviction policy as the registry does not set an expire value on keys.
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 pool: maxidle: 16 maxactive: 64 idletimeout: 300s Configure 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.
## health health: storagedriver: enabled: true interval: 10s threshold: 3 file: - file: /path/to/checked/file interval: 10s http: - uri: http://server.to.check/must/return/200 headers: Authorization: [Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==] statuscode: 200 timeout: 3s interval: 10s threshold: 3 tcp: - addr: redis-server.domain.com:6379 timeout: 3s interval: 10s threshold: 3 The health option is **optional**. It may contain preferences for a periodic health check on the storage driver's backend storage, and optional periodic checks on local files, HTTP URIs, and/or TCP servers. The results of the health checks are available at /debug/health on the debug HTTP server if the debug HTTP server is enabled (see http section). ### storagedriver storagedriver contains options for a health check on the configured storage driver's backend storage. enabled must be set to true for this health check to be active.
Parameter Required Description
enabled yes "true" to enable the storage driver health check or "false" to disable it.
interval no The length of time to wait between repetitions of the check. This field takes a positive integer and an optional suffix indicating the unit of time. Possible units are:
  • ns (nanoseconds)
  • us (microseconds)
  • ms (milliseconds)
  • s (seconds)
  • m (minutes)
  • h (hours)
If you omit the suffix, the system interprets the value as nanoseconds. The default value is 10 seconds if this field is omitted.
threshold no An integer specifying the number of times the check must fail before the check triggers an unhealthy state. If this filed is not specified, a single failure will trigger an unhealthy state.
### file file is a list of paths to be periodically checked for the existence of a file. If a file exists at the given path, the health check will fail. This can be used as a way of bringing a registry out of rotation by creating a file.
Parameter Required Description
file yes The path to check for the existence of a file.
interval no The length of time to wait between repetitions of the check. This field takes a positive integer and an optional suffix indicating the unit of time. Possible units are:
  • ns (nanoseconds)
  • us (microseconds)
  • ms (milliseconds)
  • s (seconds)
  • m (minutes)
  • h (hours)
If you omit the suffix, the system interprets the value as nanoseconds. The default value is 10 seconds if this field is omitted.
### http http is a list of HTTP URIs to be periodically checked with HEAD requests. If a HEAD request doesn't complete or returns an unexpected status code, the health check will fail.
Parameter Required Description
uri yes The URI to check.
headers no Static headers to add to each request. Each header's name should be a key underneath headers, and each value is a list of payloads for that header name. Note that values must always be lists.
statuscode no Expected status code from the HTTP URI. Defaults to 200.
timeout no The length of time to wait before timing out the HTTP request. This field takes a positive integer and an optional suffix indicating the unit of time. Possible units are:
  • ns (nanoseconds)
  • us (microseconds)
  • ms (milliseconds)
  • s (seconds)
  • m (minutes)
  • h (hours)
If you omit the suffix, the system interprets the value as nanoseconds.
interval no The length of time to wait between repetitions of the check. This field takes a positive integer and an optional suffix indicating the unit of time. Possible units are:
  • ns (nanoseconds)
  • us (microseconds)
  • ms (milliseconds)
  • s (seconds)
  • m (minutes)
  • h (hours)
If you omit the suffix, the system interprets the value as nanoseconds. The default value is 10 seconds if this field is omitted.
threshold no An integer specifying the number of times the check must fail before the check triggers an unhealthy state. If this filed is not specified, a single failure will trigger an unhealthy state.
### tcp tcp is a list of TCP addresses to be periodically checked with connection attempts. The addresses must include port numbers. If a connection attempt fails, the health check will fail.
Parameter Required Description
addr yes The TCP address to connect to, including a port number.
timeout no The length of time to wait before timing out the TCP connection. This field takes a positive integer and an optional suffix indicating the unit of time. Possible units are:
  • ns (nanoseconds)
  • us (microseconds)
  • ms (milliseconds)
  • s (seconds)
  • m (minutes)
  • h (hours)
If you omit the suffix, the system interprets the value as nanoseconds.
interval no The length of time to wait between repetitions of the check. This field takes a positive integer and an optional suffix indicating the unit of time. Possible units are:
  • ns (nanoseconds)
  • us (microseconds)
  • ms (milliseconds)
  • s (seconds)
  • m (minutes)
  • h (hours)
If you omit the suffix, the system interprets the value as nanoseconds. The default value is 10 seconds if this field is omitted.
threshold no An integer specifying the number of times the check must fail before the check triggers an unhealthy state. If this filed is not specified, a single failure will trigger an unhealthy state.
## Proxy proxy: remoteurl: https://registry-1.docker.io username: [username] password: [password] Proxy enables a registry to be configured as a pull through cache to the official Docker Hub. See [mirror](recipes/mirror.md) for more information. Pushing to a registry configured as a pull through cache is currently unsupported.
Parameter Required Description
remoteurl yes The URL of the official Docker Hub
username no The username of the Docker Hub account
password no The password for the official Docker Hub account
To enable pulling private repositories (e.g. `batman/robin`) a username and password for user `batman` must be specified. Note: These private repositories will be stored in the proxy cache's storage and relevant measures should be taken to protect access to this. ## Compatibility compatibility: schema1: signingkeyfile: /etc/registry/key.json Configure handling of older and deprecated features. Each subsection defines a such a feature with configurable behavior. ### Schema1
Parameter Required Description
signingkeyfile no The signing private key used for adding signatures to schema1 manifests. If no signing key is provided, a new ECDSA key will be generated on startup.
## Example: Development configuration 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:5001 The 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-example.yml](https://github.com/docker/distribution/blob/master/cmd/registry/config-example.yml). Both are generally useful for local development. ## Example: Middleware configuration 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. The registry supports [Amazon Cloudfront](http://aws.amazon.com/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**: Cloudfront keys exist separately to other AWS keys. See >[the documentation on AWS credentials](http://docs.aws.amazon.com/general/latest/gr/aws-security-credentials.html) >for more information.