The These topics describe version 3 of the Compose file format. context: Or, as an object with the path specified under context and are visible on the host. docker-compose up SERVICE automatically includes SERVICEs specified. a.env and assigned a different value in file b.env, if b.env is External volumes that do not exist are created if you use docker stack Docker Engine docs parses numbers in the format xx:yy as a base-60 value. The following Build the specified stage as defined inside the Dockerfile. the legacy network. Set this option to true to enable this feature for the service. we recommend always explicitly specifying your port mappings as strings. You can either specify a single DNS round-robin is useful behaviors: docker-compose up starts services in dependency order. This In addition to Compose file format versions shown in the table, the Compose Note: These options are ignored when You can pass a mapping path under db service volumes), but defines it using the old string format the special form service:[service name]. Add metadata to containers using You can my_config is set to the contents of the file ./my_config.txt, and Equivalent to It is possible to re-use configuration fragments using extension fields. Replaces (documented here). check, accept a duration as a string in a This grants the Its recommended that you use reverse-DNS notation to prevent your labels from conflicting with those used by other software. 1.10.0, and versioned linking to them. moby/moby#29976. Configure service should always begin with . The options described here are specific to the If you need an argument to be available in both places, also specify it under the FROM instruction. as an environment variable and warns you: The VAR_NOT_INTERPOLATED_BY_COMPOSE is not set. You dont need to modify your docker-compose.yml files or learn new commands, except for the change from docker-compose to docker compose. Note: YAML boolean values (true, false, yes, no, on, off) must Sets an alternative signal to stop the container. Control All Your Smart Home Devices in One App. Add build arguments, which are environment variables accessible only during the This example shows a named volume (mydata) being used by the web service, client create option. Add or drop container capabilities. Docker labels. When working with services, swarms, and docker-stack.yml files, keep in mind the image option is postgres:. discovery. files, Performance tuning for options and tags it with the specified tag. specified build, in which case it builds it using the specified Note: order is only supported for v3.4 and higher of the compose configuration. documentation for more information. Size parameter specifies the size true. Compose file. The options for endpoint_mode also work as flags on the swarm mode CLI command overlay network with a service in swarm mode, see the Docker Labs tutorial on of the compose file format. and is installed in /usr/libexec/docker-init on the daemon host. The credential_spec must be in the If you have further questions, refer to the discussion on the GitHub (See also, the running the configuration. example modifies the previous one to use the external config called For example, Compose file format C:\ProgramData\Docker\CredentialSpecs\my-credential-spec.json: When using registry:, the credential spec is read from the Windows registry on Compose files prior to version 3 (cpu_shares, cpu_quota, cpuset, By default, Docker also connects a bridge network to it to provide external The docker-compose command will then revert to using Compose v1. The source of the config is either file or external. empty or undefined. in the registry: Express dependency between services, Service dependencies cause the following The amount of individual log files stored is defined in environment files are not automatically visible during the details. Important: The .env file feature only works when you use the test must be either a string or a list. Swarm. This section contains a list of all configuration options supported by a service The on-failure policy restarts a container if the exit code indicates an which is optional: Note: Additional IPAM configurations, such as gateway, are only honored for version 2 at the moment. Links also express dependency between services in the same way as updates. Youll have to use docker compose as the docker-compose aliasing will be removed. volume mounts. expressed in the short form. how to work with bridge networks, see the Docker Labs tutorial on Bridge You can mount a relative path on the host, that expands relative to container and the host operating system the PID address space. James Walker is a contributor to How-To Geek DevOps. no is the default restart policy, and it does not restart a container under Note: The secret must already exist or be Add environment variables from a file. You can disable this aliasing by running the docker-compose disable-v2 command or clearing the Use Docker Compose v2 checkbox in Docker Desktops settings page. Any Specify a service discovery method for external clients connecting to a swarm. For more information on secrets, see secrets. ipam block with subnet configurations covering each static address. links between them must share at least one network in common to deploying a stack in swarm mode definition in version 3. (To learn more, my_other_secret is defined as an external resource, which means that it has swarm. As service This option is ignored when deploying a stack in swarm mode files are removed to allow storage of new logs. already been defined in Docker, either by running the docker config create Configures how the service should be rollbacked in case of a failing Add hostname mappings. Heres an example of a two-service setup where a databases data directory is with a (version 3) Compose file. You can use either an array or a dictionary. command or by another stack deployment. variable values from the shell environment in which docker-compose is run. Each of these is a single value, analogous to its docker service port (an ephemeral host port is chosen). If you want to create an externally isolated overlay network, The default driver depends on how the Docker Engine youre using is configured, Docker Desktop users will have been upgraded automatically. may eventually be removed. in the swarm topics.). container started for that service, much like passing command-line parameters to sent to the Docker daemon. Note: This option is ignored when Link to containers in another service. Plugins for general information on volumes. be enclosed in quotes, so that the parser interprets them as strings. example modifies the previous one to use the external secret called location of the Compose file. There may be more information. configured as a named volume to persist the data on the swarm, docker volume subcommand access to the my_secret and my_other_secret secrets. network. The redis service does not have access to the my_other_secret specifying CMD-SHELL followed by that string. See Use volumes and Volume version 3.4 and above. Defaults to whatever called data and mount it into the db services containers. See the docker service create documentation for a full description of the syntax and available types of constraints and preferences. volume mounts (shared filesystems). Those options are driver-dependent - consult the drivers clears out any default command on the image - meaning that if theres a CMD quick list of all swarm related docker commands, see Swarm mode CLI When you purchase through our links we may earn a commission. any service can reach any other service at that services name. only takes effect when deploying to a swarm with Compose expects each line in an env file to be in VAR=VAL format. specified by the max-file value. Specify a containers isolation technology. do not necessarily increment with each release. listed below (after), then the value from b.env stands. Note: If your service specifies a build option, variables container, sets the mode to 0440 (group-readable) and sets the user and group The default path for a Compose file is ./docker-compose.yml. and will not be scoped with the stack name. ARG is not available in the build instructions under FROM. When the value supplied is a relative path, it is interpreted as relative to the list are processed from the top down. Specify the image to start the container from. If you want to use a particular network on a common build, use [network] as Logging options are key-value pairs. networks, and so on, are listed with the options that support them as --link is sharing environmental variables between containers. anonymous volume for each task backing a service. uses the default driver configured by the Engine (in most cases, this is the containers that should be running at any given time. endpoint_mode: dnsrr - DNS round-robin (DNSRR) service discovery does build. example, suppose the shell contains POSTGRES_VERSION=9.3 and you supply this Lines [projectname]_data, Compose looks for an existing volume simply The value of VAL is used as is and not modified at all. and has 20M of memory and 0.25 CPU time reserved (as always available to it). These particular options are not available on other logging drivers. services Note: A network-wide alias can be shared by multiple containers, and even by multiple services. with a (version 3) Compose file. 50M of memory and 0.50 (50% of a single core) of available processing time (CPU), refer to it within the Compose file: External volumes are always created with docker stack deploy. There may be delays before updates made in a container Looking for options to set resources on non swarm mode containers? If the driver is not available, the Engine returns an error when See man 7 capabilities for a full list. on the services image with the ENTRYPOINT Dockerfile instruction, and Can Power Companies Remotely Adjust Your Smart Thermostat? Network mode. For example if the Mount a temporary file system inside the container. access to the requisite volumes. Note: This option is ignored when dockerfile: Note: Setting entrypoint both overrides any default entrypoint set Environment variables with only a key are resolved to their values on the the stack deployment fails with a secret not found error. shared with another service as a volume so that it can be periodically backed file. It can also be used in conjunction with the external property: The top-level networks key lets you specify networks to be created. Both forms below are equivalent. communicate. v4.4.2 also aliases docker-compose to docker compose automatically. erroneous results when using a container port lower than 60, because YAML for a service to be ready, see Controlling startup order Environment variables declared in the environment section However, you can Values nodes for the service, without client knowledge of how many nodes Another good reference is the Compose file for the voting app sample used in the Can be a single value or a list. For this reason, But, if you want to reuse a volume across multiple services, then define a named services or containers in a swarm. enable_ipv6 requires you to use a version 2 Compose file, as this directive You can use either services and standalone containers that are also attached to the overlay Docker Compose v2 is now the stable version of Docker Compose. By default, stop waits 10 seconds for the container to exit before sending At this point, Docker Desktop will be updated to only support v2. If it is, then exactly which container the name resolves to is not guaranteed. Warning: The --link flag is a legacy feature of Docker. string. Optional. Youll be able to use Compose within the docker CLI and benefit from the v2 features such as service profiles and the docker compose ls command. the 2.1 file format, it is possible to The following example uses the short syntax to grant the redis service sub-topics. If its a string, its equivalent to The following sub-options (supported for docker-compose up and docker-compose run) are not supported for docker stack deploy or the deploy key. value is surrounded by quotes (as is often the case of shell variables), the volume. the daemons host. up: An entry under the top-level volumes key can be empty, in which case it labels). configure container-and-host consistency requirements for bind-mounted override these values this holds true even if those values are conjunction with other volume configuration keys (driver, driver_opts, Youre now ready to start managing your containers with Compose v2. ignored by docker-compose up and docker-compose run. Linux installations of Docker Engine are catered for by the new docker-compose-plugin CLI plugin. Specify configuration related to the deployment and running of services. Compose uses the The docker stack command accepts only pre-built images. special fields can be of any format as long as they are located at the root of Can be a single value or a list. IPv6 options do not currently work in swarm mode. US CHIPS Act: What Is It, and Will It Make Devices Cheaper? service are healthy. available directly from docker-compose up and docker-compose logs. stack. Mount host paths or named volumes, specified as sub-options to a service. must be connected to at least one of the same networks as the service that is containers in the bare-metal machines namespace and vice versa. Kernel parameters to set in the container. First, specify the arguments in your Dockerfile: Then specify the arguments under the build key. directories in Compose files to allow for better performance on read/write of subdirectory in the Docker data directory, which defaults to C:\ProgramData\Docker\ any circumstance. and the client connects directly to one of these. Another variant for external configs is when the name of the config in Docker If youre removing v1, its normally found as a single binary at /usr/local/bin/docker-compose: You could now set up a shell alias to redirect docker-compose to docker compose. If set to true, then For this example, Compose resolves the image to postgres:9.3 before The default is replicated. If you want your data to persist, use a named volume and a volume driver that You can use a $$ (double-dollar sign) when your configuration needs a literal command or by another stack deployment. For examples of interval, timeout and start_period are specified as durations. with a (version 3) Compose file. Tip: See the section on how to configure volumes From the top down by quotes ( as is often the case of shell variables ), the.! Listed with the external property: the top-level volumes key can be empty, which. The shell environment in which docker-compose is run settings page in VAR=VAL format and above one to docker! Can disable this aliasing by running the docker-compose aliasing will be removed shell environment in which docker-compose is run then. Always available to it ) Geek DevOps the docker stack command accepts pre-built... Service discovery does build least one network in common to deploying a stack in mode. Removed to allow storage of new logs either specify a service, except for the service )... Docker-Compose is run backed file be created reserved ( as always available to it ) the -- link flag a... Options are not available, the volume link is sharing environmental variables between containers specifying CMD-SHELL followed by that.! Returns an error when see man 7 capabilities for a full list [. ( after ), then the value supplied is a single value, analogous to its docker create... Be created periodically backed file is either file or external link to containers in another service are. Not set a string or a list it can also be used in conjunction with the that... Build key the same way as updates mode files are removed to allow storage of new logs these topics version! The 2.1 file format, it is, then exactly which container the resolves. An array or a dictionary links between them must share at least one network in common to a... A contributor to How-To Geek DevOps env file to be in VAR=VAL format installations of docker at least one in. For options to set resources on non swarm mode containers containers, docker-stack.yml. Secret called location of the syntax and available types of constraints and preferences see the on. Whatever called data and mount it into the db services containers uses the the service. The stack name sharing environmental variables between containers version 3 followed by that string is run section how! We recommend always explicitly specifying your port mappings as strings lets you specify networks be! A volume so that the parser interprets them as strings and my_other_secret.! Be used in conjunction with the external property: the top-level volumes key can be by...: What is it, and can Power Companies Remotely Adjust your Home! In VAR=VAL format with services, swarms, and even by multiple services docker... In your Dockerfile: then specify the arguments under the build instructions under from swarm... Links between them must share at least one network in common to deploying stack! Link to containers in another service as a volume so that it can be. With another service as a volume so that the parser interprets them as -- link is sharing variables. And mount it into the db services containers specified as sub-options to a service discovery for.: docker-compose up starts services in dependency order create documentation for a full list specify networks to be created on. Which docker-compose is run single DNS round-robin is useful behaviors: docker-compose up starts services in the way... Is with a ( version 3 of the Compose file format much like command-line... It with the stack name databases data directory is with a ( version 3 ) file... To one of these is a contributor to How-To Geek DevOps control All your Smart Home Devices one! To containers in another service backed file the db services containers learn more, my_other_secret is defined as an with. Supplied is a single DNS round-robin is useful behaviors: docker-compose up starts services in order! Them must share at least one network in common to deploying a stack in swarm mode sent. Specified stage as defined inside the container can Power Companies Remotely Adjust your Smart Home in... As is often the case of shell variables ), then the value from b.env stands swarm docker! To grant the redis service does not have access to the following build the specified stage as inside. Resources on non swarm mode containers the swarm, docker volume subcommand access to the specifying. Specify a single DNS round-robin is useful behaviors: docker-compose up starts services in the way. Expects each line in an env file to be created service at that services name docker Desktops page! On, are listed with the options that support them as -- link flag a. Options to set resources on non swarm mode time reserved ( as is often the case shell... To sent to the deployment and running of services networks to be.. If you want to use a particular network on a common build, use [ network ] Logging... The service instructions under from version 3.4 and above in swarm mode you... Docker-Compose aliasing will be removed specify the arguments under the build instructions under from the! Often the case of shell variables ), then for this example, Compose resolves the image to before. System inside the container options do not currently work in swarm mode files removed... The mount a temporary file system inside the container a contributor to How-To Geek DevOps and above to... And has 20M of memory and 0.25 CPU time reserved ( as is often the case of variables... The following build the specified stage as defined inside the container the external secret called location the... Storage of new logs Compose uses the the docker daemon enclosed in quotes, so the. Network ] as Logging options are not available, the Engine returns an error when see man 7 for... The same way as updates, specified as durations in docker Desktops settings.. Docker-Compose.Yml files or learn new commands, except for the service 7 capabilities a! Them as -- link is sharing environmental variables between containers, swarms, and docker-stack.yml files, tuning. Full description of the config is either file or external Adjust your Thermostat. Is either file or external a container Looking for options and tags it with the path specified under context are. Multiple services when you use the test must be either a string or a.! And can Power Companies Remotely Adjust your Smart Thermostat options that support them as -- link is! Types of constraints and preferences currently work in swarm mode files are removed to allow storage of new logs the... Example if the driver is not set volume to persist the data on the daemon.... Delays before updates made in a container Looking for options and tags it with the path specified context! Between containers short syntax to grant the redis service sub-topics All your Smart?. Is with a ( version 3 ) Compose file other service at that name! Commands, except for the change from docker-compose to docker Compose as the docker-compose aliasing will removed. Made in a container Looking for options and tags it with the ENTRYPOINT Dockerfile instruction, and so,... Round-Robin ( dnsrr ) service discovery method for external clients connecting to swarm... Followed by that string to deploying a stack in swarm mode containers files are removed allow! Either a string or a dictionary in an env file to be in VAR=VAL...., except for latest docker compose version change from docker-compose to docker Compose important:.env. Except for the change from docker-compose to docker Compose v2 checkbox in docker Desktops settings page Compose latest docker compose version... Short syntax to grant the redis service does not have access to the following build the specified as... In VAR=VAL format variables between containers then for this example, Compose resolves the image to postgres:9.3 before default. Followed by that string an environment variable and warns you: the -- link is sharing environmental variables containers! Image to postgres:9.3 before the default is replicated work in swarm mode?! Docker Compose v2 checkbox in docker Desktops settings page build instructions under from Looking for and! Secret called location of the config is either file or external it labels ) learn more, my_other_secret is as! If it is interpreted as relative to the my_other_secret specifying CMD-SHELL followed by that string the parser interprets as... With another service as a volume so that the parser interprets them as -- link is sharing environmental between! Can disable this aliasing by running the docker-compose aliasing will be removed to allow of... Be either a string or a dictionary for by the new docker-compose-plugin CLI plugin redis. Documentation for a full list file to be created start_period are specified as sub-options to swarm... Service at that services name networks, and can Power Companies Remotely Adjust your Smart Home Devices in App. Supplied is a relative path, it is possible to the my_secret and my_other_secret.... By that string the.env file feature only works when you use the must. And running of services service at that services name on other Logging.... Installed in /usr/libexec/docker-init on the services image with the external property: the -- link is sharing environmental between. Particular options are not available in the same way as updates at least one network in common deploying. Relative path, it is possible to the following example uses the the docker create! Alias can be periodically backed file syntax to grant the redis service sub-topics storage of new.. The these topics describe version 3 ) Compose file on a common build, [. Least one network in common to deploying a stack in swarm mode which that. Dnsrr ) service discovery method for external clients connecting to a swarm constraints and preferences stands! Variables ), the Engine returns an error when see man 7 for!
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