distribution/docs/content/about/configuration.md at 9b3eac8f08207cc088270cf4acabb6ebeee1e7a0

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title	description	keywords
Configuring a registry	Explains how to configure a registry	registry, on-prem, images, tags, repository, distribution, configuration

The Registry configuration is based on a YAML file, detailed below. While it comes with sane default values out of the box, you should review it exhaustively before moving your systems to production.

Override specific configuration options

In a typical setup where you run your registry as a container, 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

be configured 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,named config.yml, then specify it in the docker run command:

$ docker run -d -p 5000:5000 --restart=always --name registry \
             -v `pwd`/config.yml:/etc/docker/registry/config.yml \
             registry:2

Use this example YAML file as a starting point.

List of configuration options

These are all configuration options for the registry. Some options in the list are mutually exclusive. Read the detailed reference information about each option before finalizing your configuration.

version: 0.1
log:
  accesslog:
    disabled: true
  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
    rootdirectory: /az/object/name/prefix
    credentials:
      type: client_secret
      clientid: client_id_string
      tenantid: tenant_id_string
      secret: secret_string
    copy_status_poll_max_retry: 10
    copy_status_poll_delay: 100ms
  gcs:
    bucket: bucketname
    keyfile: /path/to/keyfile
    credentials:
      type: service_account
      project_id: project_id_string
      private_key_id: private_key_id_string
      private_key: private_key_string
      client_email: client@example.com
      client_id: client_id_string
      auth_uri: http://example.com/auth_uri
      token_uri: http://example.com/token_uri
      auth_provider_x509_cert_url: http://example.com/provider_cert_url
      client_x509_cert_url: http://example.com/client_cert_url
    rootdirectory: /gcs/object/name/prefix
    chunksize: 5242880
  s3:
    accesskey: awsaccesskey
    secretkey: awssecretkey
    region: us-west-1
    regionendpoint: http://myobjects.local
    forcepathstyle: true
    accelerate: false
    bucket: bucketname
    encrypt: true
    keyid: mykeyid
    secure: true
    v4auth: true
    chunksize: 5242880
    multipartcopychunksize: 33554432
    multipartcopymaxconcurrency: 100
    multipartcopythresholdsize: 33554432
    rootdirectory: /s3/object/name/prefix
    usedualstack: false
    loglevel: debug
  inmemory:  # This driver takes no parameters
  delete:
    enabled: false
  redirect:
    disable: false
  cache:
    blobdescriptor: redis
    blobdescriptorsize: 10000
  maintenance:
    uploadpurging:
      enabled: true
      age: 168h
      interval: 24h
      dryrun: false
    readonly:
      enabled: false
auth:
  silly:
    realm: silly-realm
    service: silly-service
  token:
    autoredirect: true
    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
        ipfilteredby: awsregion
        awsregion: us-east-1, use-east-2
        updatefrequency: 12h
        iprangesurl: https://ip-ranges.amazonaws.com/ip-ranges.json
  storage:
    - name: redirect
      options:
        baseurl: https://example.com/
http:
  addr: localhost:5000
  prefix: /my/nested/registry/
  host: https://myregistryaddress.org:5000
  secret: asecretforlocaldevelopment
  relativeurls: false
  draintimeout: 60s
  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
      hosts: [myregistryaddress.org]
      directoryurl: https://acme-v02.api.letsencrypt.org/directory
  debug:
    addr: localhost:5001
    prometheus:
      enabled: true
      path: /metrics
  headers:
    X-Content-Type-Options: [nosniff]
  http2:
    disabled: false
  h2c:
    enabled: false
notifications:
  events:
    includereferences: true
  endpoints:
    - name: alistener
      disabled: false
      url: https://my.listener.com/event
      headers: <http.Header>
      timeout: 1s
      threshold: 10
      backoff: 1s
      ignoredmediatypes:
        - application/octet-stream
      ignore:
        mediatypes:
           - application/octet-stream
        actions:
           - pull
redis:
  addr: localhost:6379
  password: asecret
  db: 0
  dialtimeout: 10ms
  readtimeout: 10ms
  writetimeout: 10ms
  pool:
    maxidle: 16
    maxactive: 64
    idletimeout: 300s
  tls:
    enabled: false
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]
  ttl: 168h
validation:
  manifests:
    urls:
      allow:
        - ^https?://([^/]+\.)*example\.com/
      deny:
        - ^https?://www\.example\.com/

In some instances a configuration option is optional but it contains child options marked as required. In these cases, 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 stderr. You can adjust the granularity and format with this configuration section.

log:
  accesslog:
    disabled: true
  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`, and `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.

`accesslog`

accesslog:
  disabled: true

Within log, accesslog configures the behavior of the access logging system. By default, the access logging system outputs to stdout in Combined Log Format. Access logging can be disabled by setting the boolean flag disabled to true.

`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 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
    credentials:
      type: service_account
      project_id: project_id_string
      private_key_id: private_key_id_string
      private_key: private_key_string
      client_email: client@example.com
      client_id: client_id_string
      auth_uri: http://example.com/auth_uri
      token_uri: http://example.com/token_uri
      auth_provider_x509_cert_url: http://example.com/provider_cert_url
      client_x509_cert_url: http://example.com/client_cert_url
    rootdirectory: /gcs/object/name/prefix
  s3:
    accesskey: awsaccesskey
    secretkey: awssecretkey
    region: us-west-1
    regionendpoint: http://myobjects.local
    forcepathstyle: true
    accelerate: false
    bucket: bucketname
    encrypt: true
    keyid: mykeyid
    secure: true
    v4auth: true
    chunksize: 5242880
    multipartcopychunksize: 33554432
    multipartcopymaxconcurrency: 100
    multipartcopythresholdsize: 33554432
    rootdirectory: /s3/object/name/prefix
    loglevel: debug
  inmemory:
  delete:
    enabled: false
  cache:
    blobdescriptor: inmemory
    blobdescriptorsize: 10000
  maintenance:
    uploadpurging:
      enabled: true
      age: 168h
      interval: 24h
      dryrun: false
    readonly:
      enabled: false
  redirect:
    disable: false

The storage option is required and defines which storage backend is in use. You must configure exactly 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.
`azure`	Uses Microsoft Azure Blob Storage. See the driver's reference documentation.
`gcs`	Uses Google Cloud Storage. See the driver's reference documentation.
`s3`	Uses Amazon Simple Storage Service (S3) and compatible Storage Services. See the driver's reference documentation.

For testing only, you can use the inmemory storage driver. If you would like to run a registry from volatile memory, use the filesystem driver on a ramdisk.

If you are deploying a registry on Windows, 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, the length of the PATH to the mount point must be within the MAX_PATH limits (typically 255 characters), or this error will occur:

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.

`uploadpurging`

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. Defaults to `true`.
`age`	yes	Upload directories which are older than this age will be deleted.Defaults to `168h` (1 week).
`interval`	yes	The interval between upload directory purging. Defaults to `24h`.
`dryrun`	yes	Set `dryrun` to `true` to obtain a summary of what directories will be deleted. Defaults to `false`.

Note

: age and interval are strings containing a number with optional fraction and a unit suffix. Some examples: 45m, 2h10m, 168h.

`readonly`

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 structure 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 structure to enable caching of data accessed in the storage backend. Currently, the only available cache provides fast access to layer metadata, which uses the blobdescriptor field if configured.

You can set blobdescriptor field to redis or inmemory. If set to redis,a Redis pool caches layer metadata. If set to inmemory, an in-memory map caches layer metadata.

NOTE: Formerly, blobdescriptor was known as layerinfo. While these are equivalent, layerinfo has been deprecated.

If blobdescriptor is set to inmemory, the optional blobdescriptorsize parameter sets a limit on the number of descriptors to store in the cache. The default value is 10000. If this parameter is set to 0, the cache is allowed to grow with no size limit.

`redirect`

The redirect subsection provides configuration for managing redirects from content backends. For backends that support it, redirecting is enabled by default. In certain deployment scenarios, you may decide 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 aggressively caching.

To disable redirects, add 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. Possible auth providers include:

silly
token
htpasswd
[none]

You can configure only one authentication provider.

`silly`

The silly authentication provider is only appropriate for development. It simply checks for the existence of the Authorization header in the HTTP request. It does not check 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 for which access was denied.

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 you to decouple the authentication system from the registry. It is an 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 used to sign authentication tokens.
`autoredirect`	no	When set to `true`, `realm` will automatically be set using the Host header of the request as the domain and a path of `/auth/token/`

For more information about Token based authentication configuration, see the specification.

`htpasswd`

The htpasswd authentication backed allows you to configure basic authentication using an Apache htpasswd file. The only supported password format is bcrypt. Entries with other hash types are 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

: If the htpasswd file is missing, the file will be created and provisioned with a default user and automatically generated password. The password will be printed to stdout.

Warning

: Only use the htpasswd authentication scheme 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	The path to the `htpasswd` file to load at startup.

`middleware`

The middleware structure is optional. Use this option to inject middleware at named hook points. Each middleware must implement the same interface as the object it is wrapping. For instance, a registry middleware must implement the distribution.Namespace interface, while a repository middleware must implement distribution.Repository, and a storage middleware must implement driver.StorageDriver.

This is 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
        ipfilteredby: awsregion
        awsregion: us-east-1, use-east-2
        updatefrequency: 12h
        iprangesurl: https://ip-ranges.amazonaws.com/ip-ranges.json

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	The `SCHEME://HOST[/PATH]` at which Cloudfront is served.
`privatekey`	yes	The private key for Cloudfront, provided by AWS.
`keypairid`	yes	The key pair ID provided by AWS.
`duration`	no	An integer and unit for the duration of the Cloudfront session. Valid time units are `ns`, `us` (or `µs`), `ms`, `s`, `m`, or `h`. For example, `3000s` is valid, but `3000 s` is not. If you do not specify a `duration` or you specify an integer without a time unit, the duration defaults to `20m` (20 minutes).
`ipfilteredby`	no	A string with the following value `none`, `aws` or `awsregion`.
`awsregion`	no	A comma separated string of AWS regions, only available when `ipfilteredby` is `awsregion`. For example, `us-east-1, us-west-2`
`updatefrequency`	no	The frequency to update AWS IP regions, default: `12h`
`iprangesurl`	no	The URL contains the AWS IP ranges information, default: `https://ip-ranges.amazonaws.com/ip-ranges.json`

Value of ipfilteredby can be:

Value	Description
`none`	default, do not filter by IP
`aws`	IP from AWS goes to S3 directly
`awsregion`	IP from certain AWS regions goes to S3 directly, use together with `awsregion`.

`redirect`

You can use the redirect storage middleware 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`.

`http`

http:
  addr: localhost:5000
  net: tcp
  prefix: /my/nested/registry/
  host: https://myregistryaddress.org:5000
  secret: asecretforlocaldevelopment
  relativeurls: false
  draintimeout: 60s
  tls:
    certificate: /path/to/x509/public
    key: /path/to/x509/private
    clientcas:
      - /path/to/ca.pem
      - /path/to/another/ca.pem
    minimumtls: tls1.2
    ciphersuites:
      - TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
      - TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
    letsencrypt:
      cachefile: /path/to/cache-file
      email: emailused@letsencrypt.com
      hosts: [myregistryaddress.org]
      directoryurl: https://acme-v02.api.letsencrypt.org/directory
  debug:
    addr: localhost:5001
  headers:
    X-Content-Type-Options: [nosniff]
  http2:
    disabled: false
  h2c:
    enabled: false

The http option details the configuration for the HTTP server that hosts the registry.

Parameter	Required	Description
`addr`	no	The address for which the server should accept connections. The form depends on a network type (see the `net` option). Use `HOST:PORT` for TCP and `FILE` for a UNIX socket. The `addr` field is only optional if socket-activation is used (in which case `addr` and `net` are ignored regardless of if they are specified).
`net`	no	The network used to create a listening socket. Known networks are `unix` and `tcp`.
`prefix`	no	If the server does not run at the root path, set this to the value of the prefix. The root path is the section before `v2`. It requires both preceding and trailing slashes, such as in the example `/path/`.
`host`	no	A fully-qualified URL for an externally-reachable address for the registry. If present, it is used when creating generated URLs. Otherwise, these URLs are derived from client requests.
`secret`	no	A random piece of data 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. If you omit the secret, the registry will automatically generate a secret when it starts. 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	If `true`, the registry returns 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.
`draintimeout`	no	Amount of time to wait for HTTP connections to drain before shutting down after registry receives SIGTERM signal

`tls`

The tls structure within http is optional. Use this to configure TLS for the server. If you already have a web server running on the same host as the registry, you may prefer to configure TLS on that web server and proxy connections to the registry server.

Parameter	Required	Description
`certificate`	yes	Absolute path to the x509 certificate file.
`key`	yes	Absolute path to the x509 private key file.
`clientcas`	no	An array of absolute paths to x509 CA files.
`minimumtls`	no	Minimum TLS version allowed (tls1.0, tls1.1, tls1.2, tls1.3). Defaults to tls1.2
`ciphersuites`	no	Cipher suites allowed. Please see below for allowed values and default.

Available cipher suites:

TLS_RSA_WITH_RC4_128_SHA
TLS_RSA_WITH_3DES_EDE_CBC_SHA
TLS_RSA_WITH_AES_128_CBC_SHA
TLS_RSA_WITH_AES_256_CBC_SHA
TLS_RSA_WITH_AES_128_CBC_SHA256
TLS_RSA_WITH_AES_128_GCM_SHA256
TLS_RSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_ECDSA_WITH_RC4_128_SHA
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
TLS_ECDHE_RSA_WITH_RC4_128_SHA
TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
TLS_AES_128_GCM_SHA256
TLS_AES_256_GCM_SHA384
TLS_CHACHA20_POLY1305_SHA256

Default cipher suites:

TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
TLS_AES_128_GCM_SHA256
TLS_CHACHA20_POLY1305_SHA256
TLS_AES_256_GCM_SHA384

`letsencrypt`

The letsencrypt structure within tls is optional. Use this to configure TLS certificates provided by Let's Encrypt.

NOTE: When using Let's Encrypt, ensure that the outward-facing address is accessible on port 443. The registry defaults to listening on port 5000. If you run the registry as a container, consider adding the flag -p 443:5000 to the docker run command or using a similar setting in a cloud configuration. You should also set the hosts option to the list of hostnames that are valid for this registry to avoid trying to get certificates for random hostnames due to malicious clients connecting with bogus SNI hostnames. Please ensure that you have the ca-certificates package installed in order to verify letsencrypt certificates.

Parameter	Required	Description
`cachefile`	yes	Absolute path to a file where the Let's Encrypt agent can cache data.
`email`	yes	The email address used to register with Let's Encrypt.
`hosts`	no	The hostnames allowed for Let's Encrypt certificates.
`directoryurl`	no	The url to use for the ACME server.

`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 endpoint should not be exposed publicly to the internet. Instead, keep the debug endpoint private or enforce authentication for it.

The debug section takes a single required addr parameter, which specifies the HOST:PORT on which the debug server should accept connections.

If configured, notification, redis, and proxy statistics are exposed at /debug/vars in JSON format.

`prometheus`

prometheus:
  enabled: true
  path: /metrics

The prometheus option defines whether the prometheus metrics are enabled, as well as the path to access the metrics.

The prometheus metrics cover storage, notification and proxy statistics.

Parameter	Required	Description
`enabled`	no	Set `true` to enable the prometheus server
`path`	no	The path to access the metrics, `/metrics` by default

The url to access the metrics is HOST:PORT/path, where HOST:PORT is defined in addr under debug.

`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 file.

`http2`

The http2 structure within http is optional. Use this to control HTTP/2 over TLS settings for the registry. If tls is not configured this option is ignored. To enable HTTP/2 over non TLS connections use h2c instead.

Parameter	Required	Description
`disabled`	no	If `true`, then `http2` support is disabled.

`h2c`

The h2c structure within http is optional. Use this to control H2C (HTTP/2 Cleartext) settings for the registry. Useful when deploying the registry behind a load balancer (e.g. Google Cloud Run)

Parameter	Required	Description
`enabled`	no	If `true`, then `h2c` support is enabled.

`notifications`

notifications:
  events:
    includereferences: true
  endpoints:
    - name: alistener
      disabled: false
      url: https://my.listener.com/event
      headers: <http.Header>
      timeout: 1s
      threshold: 10
      backoff: 1s
      ignoredmediatypes:
        - application/octet-stream
      ignore:
        mediatypes:
           - application/octet-stream
        actions:
           - pull

The notifications option is optional and currently may contain a single option, endpoints.

`endpoints`

The endpoints structure contains 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	If `true`, notifications are disabled for the service.
`url`	yes	The URL to which events should be published.
`headers`	yes	A list of static headers to add to each request. Each header's name is a key beneath `headers`, and each value is a list of payloads for that header name. Values must always be lists.
`timeout`	yes	A value for the HTTP timeout. A positive integer and an optional suffix indicating the unit of time, which may be `ns`, `us`, `ms`, `s`, `m`, or `h`. If you omit the unit of time, `ns` is used.
`threshold`	yes	An integer specifying how long to wait before backing off a failure.
`backoff`	yes	How long the system backs off before retrying after a failure. A positive integer and an optional suffix indicating the unit of time, which may be `ns`, `us`, `ms`, `s`, `m`, or `h`. If you omit the unit of time, `ns` is used.
`ignoredmediatypes`	no	A list of target media types to ignore. Events with these target media types are not published to the endpoint.
`ignore`	no	Events with these mediatypes or actions are not published to the endpoint.

`ignore`

Parameter	Required	Description
`mediatypes`	no	A list of target media types to ignore. Events with these target media types are not published to the endpoint.
`actions`	no	A list of actions to ignore. Events with these actions are not published to the endpoint.

`events`

The events structure configures the information provided in event notifications.

Parameter	Required	Description
`includereferences`	no	If `true`, include reference information in manifest events.

`redis`

redis:
  addr: localhost:6379
  password: asecret
  db: 0
  dialtimeout: 10ms
  readtimeout: 10ms
  writetimeout: 10ms
  pool:
    maxidle: 16
    maxactive: 64
    idletimeout: 300s
  tls:
    enabled: false

Declare parameters for constructing the redis connections. Registry instances may use the Redis instance for several applications. Currently, it caches information about immutable blobs. Most of the redis options control how the registry connects to the redis instance. You can control the pool's behavior with the pool subsection. Additionally, you can control TLS connection settings with the tls subsection (in-transit encryption).

You should configure Redis with the allkeys-lru eviction policy, because the registry does not set an expiration value on keys.

Parameter	Required	Description
`addr`	yes	The address (host and port) of the Redis instance.
`password`	no	A password used to authenticate to the Redis instance.
`db`	no	The name of the database to use for each connection.
`dialtimeout`	no	The timeout for connecting to the Redis instance.
`readtimeout`	no	The timeout for reading from the Redis instance.
`writetimeout`	no	The timeout for writing to the Redis instance.

`pool`

pool:
  maxidle: 16
  maxactive: 64
  idletimeout: 300s

Use these settings to configure the behavior of the Redis connection pool.

Parameter	Required	Description
`maxidle`	no	The maximum number of idle connections in the pool.
`maxactive`	no	The maximum number of connections which can be open before blocking a connection request.
`idletimeout`	no	How long to wait before closing inactive connections.

`tls`

tls:
  enabled: false

Use these settings to configure Redis TLS.

Parameter	Required	Description
`enabled`	no	Whether or not to use TLS in-transit.

`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, and contains preferences for a periodic health check on the storage driver's backend storage, as well as optional periodic checks on local files, HTTP URIs, and/or TCP servers. The results of the health checks are available at the /debug/health endpoint on the debug HTTP server if the debug HTTP server is enabled (see http section).

`storagedriver`

The storagedriver structure contains options for a health check on the configured storage driver's backend storage. The health check is only active when enabled is set to true.

Parameter	Required	Description
`enabled`	yes	Set to `true` to enable storage driver health checks or `false` to disable them.
`interval`	no	How long to wait between repetitions of the storage driver health check. A positive integer and an optional suffix indicating the unit of time. The suffix is one of `ns`, `us`, `ms`, `s`, `m`, or `h`. Defaults to `10s` if the value is omitted. If you specify a value but omit the suffix, the value is interpreted as a number of nanoseconds.
`threshold`	no	A positive integer which represents the number of times the check must fail before the state is marked as unhealthy. If not specified, a single failure marks the state as unhealthy.

`file`

The file structure includes 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. You can use this mechanism to bring a registry out of rotation by creating a file.

Parameter	Required	Description
`file`	yes	The path to check for existence of a file.
`interval`	no	How long to wait before repeating the check. A positive integer and an optional suffix indicating the unit of time. The suffix is one of `ns`, `us`, `ms`, `s`, `m`, or `h`. Defaults to `10s` if the value is omitted. If you specify a value but omit the suffix, the value is interpreted as a number of nanoseconds.

`http`

The http structure includes a list of HTTP URIs to periodically check with HEAD requests. If a HEAD request does not 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 is a key beneath `headers`, and each value is a list of payloads for that header name. Values must always be lists.
`statuscode`	no	The expected status code from the HTTP URI. Defaults to `200`.
`timeout`	no	How long to wait before timing out the HTTP request. A positive integer and an optional suffix indicating the unit of time. The suffix is one of `ns`, `us`, `ms`, `s`, `m`, or `h`. If you specify a value but omit the suffix, the value is interpreted as a number of nanoseconds.
`interval`	no	How long to wait before repeating the check. A positive integer and an optional suffix indicating the unit of time. The suffix is one of `ns`, `us`, `ms`, `s`, `m`, or `h`. Defaults to `10s` if the value is omitted. If you specify a value but omit the suffix, the value is interpreted as a number of nanoseconds.
`threshold`	no	The number of times the check must fail before the state is marked as unhealthy. If this field is not specified, a single failure marks the state as unhealthy.

`tcp`

The tcp structure includes a list of TCP addresses to periodically check using TCP connection attempts. Addresses must include port numbers. If a connection attempt fails, the health check will fail.

Parameter	Required	Description
`addr`	yes	The TCP address and port to connect to.
`timeout`	no	How long to wait before timing out the TCP connection. A positive integer and an optional suffix indicating the unit of time. The suffix is one of `ns`, `us`, `ms`, `s`, `m`, or `h`. If you specify a value but omit the suffix, the value is interpreted as a number of nanoseconds.
`interval`	no	How long to wait between repetitions of the check. A positive integer and an optional suffix indicating the unit of time. The suffix is one of `ns`, `us`, `ms`, `s`, `m`, or `h`. Defaults to `10s` if the value is omitted. If you specify a value but omit the suffix, the value is interpreted as a number of nanoseconds.
`threshold`	no	The number of times the check must fail before the state is marked as unhealthy. If this field is not specified, a single failure marks the state as unhealthy.

`proxy`

proxy:
  remoteurl: https://registry-1.docker.io
  username: [username]
  password: [password]
  ttl: 168h

The proxy structure allows a registry to be configured as a pull-through cache to Docker Hub. See mirror for more information. Pushing to a registry configured as a pull-through cache is unsupported.

Parameter	Required	Description
`remoteurl`	yes	The URL for the repository on Docker Hub.
`username`	no	The username registered with Docker Hub which has access to the repository.
`password`	no	The password used to authenticate to Docker Hub using the username specified in `username`.
`ttl`	no	Expire proxy cache configured in "storage" after this time. Cache 168h(7 days) by default, set to 0 to disable cache expiration, The suffix is one of `ns`, `us`, `ms`, `s`, `m`, or `h`. If you specify a value but omit the suffix, the value is interpreted as a number of nanoseconds.

To enable pulling private repositories (e.g. batman/robin) specify the username (such as batman) and the password for that username.

Note

Take appropriate measures to protect access to the proxy cache.

`validation`

validation:
  manifests:
    urls:
      allow:
        - ^https?://([^/]+\.)*example\.com/
      deny:
        - ^https?://www\.example\.com/

`disabled`

The disabled flag disables the other options in the validation section. They are enabled by default. This option deprecates the enabled flag.

`manifests`

Use the manifests subsection to configure validation of manifests. If disabled is false, the validation allows nothing.

`urls`

The allow and deny options are each a list of regular expressions that restrict the URLs in pushed manifests.

If allow is unset, pushing a manifest containing URLs fails.

If allow is set, pushing a manifest succeeds only if all URLs match one of the allow regular expressions and one of the following holds:

deny is unset.
deny is set but no URLs within the manifest match any of the deny regular expressions.

Example: Development configuration

You can use this simple example 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

This example configures the registry instance to run on port 5000, binding to localhost, with the debug server enabled. Registry data is stored in the /var/lib/registry directory. Logging is set to debug mode, which is the most verbose.

See config-example.yml for another simple configuration. Both examples are generally useful for local development.

Example: Middleware configuration

This example configures Amazon Cloudfront as the storage middleware in a registry. Middleware allows the registry to serve layers via a content delivery network (CDN). This reduces requests to the storage layer.

Cloudfront requires the S3 storage driver.

This is the configuration expressed in YAML:

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

See the configuration reference for Cloudfront for more information about configuration options.

{{< hint type=note >}} Cloudfront keys exist separately from other AWS keys. See the documentation on AWS credentials for more information. {{< /hint >}}

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Override specific configuration options

Overriding the entire configuration file

List of configuration options

version

log

accesslog

hooks

loglevel

storage

maintenance

uploadpurging

readonly

delete

cache

redirect

auth

silly

token

htpasswd

middleware

cloudfront

redirect

http

tls

letsencrypt

debug

prometheus

headers

http2

h2c

notifications

endpoints

ignore

events

redis

pool

tls

health

storagedriver

file

http

tcp

proxy

validation

disabled

manifests

urls

Example: Development configuration

Example: Middleware configuration

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Raw Blame History

`version`

`log`

`accesslog`

`hooks`

`loglevel`

`storage`

`maintenance`

`uploadpurging`

`readonly`

`delete`

`cache`

`redirect`

`auth`

`silly`

`token`

`htpasswd`

`middleware`

`cloudfront`

`redirect`

`http`

`tls`

`letsencrypt`

`debug`

`prometheus`

`headers`

`http2`

`h2c`

`notifications`

`endpoints`

`ignore`

`events`

`redis`

`pool`

`tls`

`health`

`storagedriver`

`file`

`http`

`tcp`

`proxy`

`validation`

`disabled`

`manifests`

`urls`