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Download DirectX End-User Runtime Web Installer Download. Choose the download you want. pdf pdf 3. Download Summary:. KB MB GB. Total Size: 0. Back Next. Microsoft recommends you install a download manager. Microsoft Download Manager. A Compose implementation to parse a Compose file using unsupported attributes SHOULD warn user. We recommend implementors to support those running modes:.

The Compose specification allows one to define a platform-agnostic container based application. Such an application is designed as a set of containers which have to both run together with adequate shared resources and communication channels.

Computing components of an application are defined as Services. A Service is an abstract concept implemented on platforms by running the same container image and configuration one or more times. Services communicate with each other through Networks. In this specification, a Network is a platform capability abstraction to establish an IP route between containers within services connected together.

Low-level, platform-specific networking options are grouped into the Network definition and MAY be partially implemented on some platforms. Services store and share persistent data into Volumes. The specification describes such a persistent data as a high-level filesystem mount with global options.

Actual platform-specific implementation details are grouped into the Volumes definition and MAY be partially implemented on some platforms. Some services require configuration data that is dependent on the runtime or platform. For this, the specification defines a dedicated concept: Configs. From a Service container point of view, Configs are comparable to Volumes, in that they are files mounted into the container.

But the actual definition involves distinct platform resources and services, which are abstracted by this type. A Secret is a specific flavor of configuration data for sensitive data that SHOULD NOT be exposed without security considerations. Secrets are made available to services as files mounted into their containers, but the platform-specific resources to provide sensitive data are specific enough to deserve a distinct concept and definition within the Compose specification.

Distinction within Volumes, Configs and Secret allows implementations to offer a comparable abstraction at service level, but cover the specific configuration of adequate platform resources for well identified data usages. A Project is an individual deployment of an application specification on a platform. A Compose implementation creating resources on a platform MUST prefix resource names by project and set the label com. Project name can be set explicitly by top-level name attribute.

Compose implementation MUST offer a way for user to set a custom project name and override this name, so that the same compose. yaml file can be deployed twice on the same infrastructure, without changes, by just passing a distinct name. The following example illustrates Compose specification concepts with a concrete example application.

The example is non-normative. Both services communicate with each other on an isolated back-tier network, while frontend is also connected to a front-tier network and exposes port for external usage. This example illustrates the distinction between volumes, configs and secrets. Secrets and configs are read-only. The volume configuration allows you to select a volume driver and pass driver options to tweak volume management according to the actual infrastructure.

Configs and Secrets rely on platform services, and are declared external as they are not managed as part of the application lifecycle: the Compose implementation will use a platform-specific lookup mechanism to retrieve runtime values. The default path for a Compose file is compose. yaml preferred or compose. yml in working directory. Compose implementations SHOULD also support docker-compose. yaml and docker-compose. yml for backward compatibility. If both files exist, Compose implementations MUST prefer canonical compose.

yaml one. Multiple Compose files can be combined together to define the application model. Simple attributes and maps get overridden by the highest order Compose file, lists get merged by appending. As some Compose file elements can both be expressed as single strings or complex objects, merges MUST apply to the expanded form.

Profiles allow to adjust the Compose application model for various usages and environments. A Compose implementation SHOULD allow the user to define a set of active profiles. The exact mechanism is implementation specific and MAY include command line flags, environment variables, etc. The Services top-level element supports a profiles attribute to define a list of named profiles. Services without a profiles attribute set MUST always be enabled. A service MUST be ignored by the Compose implementation when none of the listed profiles match the active ones, unless the service is explicitly targeted by a command.

In that case its profiles MUST be added to the set of active profiles. All other top-level elements are not affected by profiles and are always active. References to other services by links , extends or shared resource syntax service:xxx MUST not automatically enable a component that would otherwise have been ignored by active profiles.

Instead the Compose implementation MUST return an error. Top-level version property is defined by the specification for backward compatibility but is only informative. A Compose implementation SHOULD NOT use this version to select an exact schema to validate the Compose file, but prefer the most recent schema at the time it has been designed.

Compose implementations SHOULD validate whether they can fully parse the Compose file. If some fields are unknown, typically because the Compose file was written with fields defined by a newer version of the specification, Compose implementations SHOULD warn the user. Compose implementations MUST offer a way for user to override this name, and SHOULD define a mechanism to compute a default project name, to be used if the top-level name element is not set. Services are backed by a set of containers, run by the platform according to replication requirements and placement constraints.

Being backed by containers, Services are defined by a Docker image and set of runtime arguments. All containers within a service are identically created with these arguments.

A Compose file MUST declare a services root element as a map whose keys are string representations of service names, and whose values are service definitions. A service definition contains the configuration that is applied to each container started for that service.

Each service MAY also include a Build section, which defines how to create the Docker image for the service. Compose implementations MAY support building docker images using this service definition. If not implemented the Build section SHOULD be ignored and the Compose file MUST still be considered valid. Build support is an OPTIONAL aspect of the Compose specification, and is described in detail in the Build support documentation. Each Service defines runtime constraints and requirements to run its containers.

Deploy support is an OPTIONAL aspect of the Compose specification, and is described in detail in the Deployment support documentation. If not implemented the Deploy section SHOULD be ignored and the Compose file MUST still be considered valid.

build specifies the build configuration for creating container image from source, as defined in the Build support documentation. Each item in the list MUST have two keys:. Modify the proportion of bandwidth allocated to this service relative to other services. Takes an integer value between 10 and , with being the default. Can be either an integer value using microseconds as unit or a duration. cpus define the number of potentially virtual CPUs to allocate to service containers.

This is a fractional number. cpuset defines the explicit CPUs in which to allow execution. Can be a range or a list 0,1. command overrides the default command declared by the container image i. The command can also be a list, in a manner similar to Dockerfile :. configs grant access to configs on a per-service basis using the per-service configs configuration.

Two different syntax variants are supported. There are two syntaxes defined for configs. To remain compliant to this specification, an implementation MUST support both syntaxes. Implementations MUST allow use of both short and long syntaxes within the same document. The short syntax variant only specifies the config name.

The source name and destination mount point are both set to the config name. If the external config does not exist, the deployment MUST fail. Attempting to do so MUST result in an error. Compose implementations MAY also support additional protocols for custom use-cases. A registry value with the given name must be located in:. The following example loads the credential spec from a value named my-credential-spec in the registry:.

When configuring a gMSA credential spec for a service, you only need to specify a credential spec with config , as shown in the following example:. The short syntax variant only specifies service names of the dependencies. Service dependencies cause the following behaviors:. Compose implementations MUST create services in dependency order. In the following example, db and redis are created before web.

Compose implementations MUST remove services in dependency order. In the following example, web is removed before db and redis. Compose implementations MUST guarantee dependency services have been started before starting a dependent service. deploy specifies the configuration for the deployment and lifecycle of services, as defined here. The format is the same format the Linux kernel specifies in the Control Groups Device Whitelist Controller.

dns defines custom DNS servers to set on the container network interface configuration. Can be a single value or a list.

conf file on Linux. dns defines custom DNS search domains to set on container network interface configuration. domainname declares a custom domain name to use for the service container. MUST be a valid RFC hostname. entrypoint overrides the default entrypoint for the Docker image i. The entrypoint can also be a list, in a manner similar to Dockerfile :. The files in the list MUST be processed from the top down. For the same variable specified in two env files, the value from the last file in the list MUST stand.

Environment variables declared in the environment section MUST override these values — this holds true even if those values are empty or undefined.

Lines beginning with MUST be ignored. Blank lines MUST also be ignored. The value of VAL is used as a raw string and not modified at all. If the value is surrounded by quotes as is often the case for shell variables , the quotes MUST be included in the value passed to containers created by the Compose implementation. VAL MAY be omitted, in such cases the variable value is empty string. environment defines environment variables set in the container. environment can use either an array or a map.

Any boolean values; true, false, yes, no, SHOULD be enclosed in quotes to ensure they are not converted to True or False by the YAML parser. Environment variables MAY be declared by a single key no value to equals sign.

In such a case Compose implementations SHOULD rely on some user interaction to resolve the value. If they do not, the variable is unset and will be removed from the service container environment. expose defines the ports that Compose implementations MUST expose from container. These ports MUST be accessible to linked services and SHOULD NOT be published to the host machine. Only the internal container ports can be specified.

Extend another service, in the current file or another, optionally overriding configuration. You can use extends on any service together with other configuration keys. The extends value MUST be a mapping defined with a required service and an optional file key. If supported Compose implementations MUST process extends in the following way:. Service denoted by service MUST be present in the identified referenced Compose file.

Compose implementations MUST return an error if:. Two service definitions main one in the current Compose file and referenced one specified by extends MUST be merged in the following way:. The following keys should be treated as mappings: build. args , build. labels , build. labels , deploy. limits , environment , healthcheck , labels , logging. One exception that applies to healthcheck is that main mapping cannot specify disable: true unless referenced mapping also specifies disable: true.

Compose implementations MUST return an error in this case. Produces the following configuration for the cli service. The same output is produced if array syntax is used. Note that mounted path now points to the new volume name and ro flag was applied. If referenced service definition contains extends mapping, the items under it are simply copied into the new merged definition. Merging process is then kicked off again until no extends keys are remaining.

Here, cli services gets user key from common service, which in turn gets this key from base service. constraints , deploy. preferences , deploy. Any duplicates resulting from the merge are removed so that the sequence only contains unique elements. Unlike sequence fields mentioned above, duplicates resulting from the merge are not removed.

An alias of the form SERVICE:ALIAS can be specified. Values MUST set hostname and IP address for additional hosts in the form of HOSTNAME:IP. An example of where this is useful is when multiple containers running as different users need to all read or write the same file on a shared volume. test defines the command the Compose implementation will run to check container health. It can be either a string or a list. Both forms below are equivalent:. NONE disable the healthcheck, and is mostly useful to disable Healthcheck set by image.

Alternatively the healthcheck set by the image can be disabled by setting disable: true :. hostname declares a custom host name to use for the service container. image specifies the image to start the container from. Compose implementations with build support MAY offer alternative options for the end user to control precedence of pull over building the image from source, however pulling the image MUST be the default behavior.

image MAY be omitted from a Compose file as long as a build section is declared. Compose implementations without build support MUST fail when image is missing from the Compose file. init run an init process PID 1 inside the container that forwards signals and reaps processes. Set this option to true to enable this feature for the service. ipc configures the IPC isolation mode set by service container. Available values are platform specific, but Compose specification defines specific values which MUST be implemented as described if supported:.

Supported values are platform-specific. labels add metadata to containers. You can use either an array or a map. The com. compose label prefix is reserved. Specifying labels with this prefix in the Compose file MUST result in a runtime error. links defines a network link to containers in another service. Either specify both the service name and a link alias SERVICE:ALIAS , or just the service name.

Containers for the linked service MUST be reachable at a hostname identical to the alias, or the service name if no alias was specified. If services do declare networks they are attached to, links SHOULD NOT override the network configuration and services not attached to a shared network SHOULD NOT be able to communicate. Compose implementations MAY NOT warn the user about this configuration mismatch.

logging defines the logging configuration for the service. The default and available values are platform specific. Driver specific options can be set with options as key-value pairs. This is a modifier attribute that only has meaning if memory is also set. Using swap allows the container to write excess memory requirements to disk when the container has exhausted all the memory that is available to it. There is a performance penalty for applications that swap memory to disk often.

Available values are platform specific, but Compose specification define specific values which MUST be implemented as described if supported:. networks defines the networks that service containers are attached to, referencing entries under the top-level networks key. aliases declares alternative hostnames for this service on the network. Since aliases are network-scoped, the same service can have different aliases on different networks.

Note : A network-wide alias can be shared by multiple containers, and even by multiple services. If it is, then exactly which container the name resolves to is not guaranteed. In the example below, service frontend will be able to reach the backend service at the hostname backend or database on the back-tier network, and service monitoring will be able to reach same backend service at db or mysql on the admin network.

The corresponding network configuration in the top-level networks section MUST have an ipam block with subnet configurations covering each static address. Link-local IPs are special IPs which belong to a well known subnet and are purely managed by the operator, usually dependent on the architecture where they are deployed. Implementation is Platform specific. If unspecified, the default value is 0. Value MUST be within [,] range.

pid sets the PID mode for container created by the Compose implementation. Supported values are platform specific. Set to -1 for unlimited PIDs. Exposes container ports. The short syntax is a colon-separated string to set host IP, host port and container port in the form:.

Host IP, if not set, MUST bind to all network interfaces. Port can be either a single value or a range.

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Enables language detection on in-page text content which is then exposed to assistive technology such as screen readers. yml in working directory. Tells whether the code is running browser tests this changes the startup URL used by the content shell and also disables features that can make tests flaky [like monitoring of memory pressure]. Note : Host IP mapping MAY not be supported on the platform, in such case Compose implementations SHOULD reject the Compose file and MUST inform the user they will ignore the specified host IP. Some services require configuration data that is dependent on the runtime or platform.

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