docker-compose.yml

version: '3'

services:
    b:
        build:
            context: .
            dockerfile: Dockerfile.b
            args:
                image_tag: ${IMAGE_TAG}
        image: b:${IMAGE_TAG}
        depends_on:
            - a
    a:
        build:
            context: .
            dockerfile: Dockerfile.a
        image: a:${IMAGE_TAG}

no-parallel.log

$ IMAGE_TAG=dummy11 docker-compose --verbose build --no-cache
compose.config.config.find: Using configuration files: ./docker-compose.yml
docker.utils.config.find_config_file: Trying paths: ['/home/giorgio/.docker/config.json', '/home/giorgio/.dockercfg']
docker.utils.config.find_config_file: Found file at path: /home/giorgio/.docker/config.json
docker.auth.load_config: Found 'auths' section
docker.auth.parse_auth: Found entry (registry='https://index.docker.io/v1/', username='giorgiosironi')
urllib3.connectionpool._make_request: http://localhost:None "GET /v1.25/version HTTP/1.1" 200 562
compose.cli.command.get_client: docker-compose version 1.24.1, build 4667896b
docker-py version: 3.7.3
CPython version: 3.6.8
OpenSSL version: OpenSSL 1.1.0j  20 Nov 2018
compose.cli.command.get_client: Docker base_url: http+docker://localhost
compose.cli.command.get_client: Docker version: Platform={'Name': 'Docker Engine - Community'}, Components=[{'Name': 'Engine', 'Version': '18.09.6', 'Details': {'ApiVersion': '1.39', 'Arch': 'amd64', 'BuildTime': '2019-05-04T01:59:36.000000000+00:00', 'Experimental': 'false', 'GitCommit': '481bc77', 'GoVersion': 'go1.10.8', 'KernelVersion': '4.15.0-51-generic', 'MinAPIVersion': '1.12', 'Os': 'linux'}}], Version=18.09.6, ApiVersion=1.39, MinAPIVersion=1.12, GitCommit=481bc77, GoVersion=go1.10.8, Os=linux, Arch=amd64, KernelVersion=4.15.0-51-generic, BuildTime=2019-05-04T01:59:36.000000000+00:00
compose.cli.verbose_proxy.proxy_callable: docker inspect_network <- ('dockercomposeparallel_default')
urllib3.connectionpool._make_request: http://localhost:None "GET /v1.25/networks/dockercomposeparallel_default HTTP/1.1" 404 62
compose.service.build: Building a
compose.cli.verbose_proxy.proxy_callable: docker build <- (path='/home/giorgio/code/docker-compose-parallel', tag='a:dummy11', rm=True, forcerm=False, pull=False, nocache=True, dockerfile='Dockerfile.a', cache_from=None, labels=None, buildargs={}, network_mode=None, target=None, shmsize=None, extra_hosts=None, container_limits={'memory': None}, gzip=False, isolation=None, platform=None)
docker.api.build._set_auth_headers: Looking for auth config
docker.api.build._set_auth_headers: Sending auth config ('https://index.docker.io/v1/')
urllib3.connectionpool._make_request: http://localhost:None "POST /v1.25/build?t=a%3Adummy11&q=False&nocache=True&rm=True&forcerm=False&pull=False&dockerfile=Dockerfile.a HTTP/1.1" 200 None
compose.cli.verbose_proxy.proxy_callable: docker build -> <generator object APIClient._stream_helper at 0x7fceea107620>
Step 1/2 : FROM busybox
 ---> 64f5d945efcc
Step 2/2 : RUN sleep 5
 ---> Running in 7b64debd6451
Removing intermediate container 7b64debd6451
 ---> 9461b6fa1a49
Successfully built 9461b6fa1a49
Successfully tagged a:dummy11
compose.cli.verbose_proxy.proxy_callable: docker close <- ()
compose.cli.verbose_proxy.proxy_callable: docker close -> None
compose.service.build: Building b
compose.cli.verbose_proxy.proxy_callable: docker build <- (path='/home/giorgio/code/docker-compose-parallel', tag='b:dummy11', rm=True, forcerm=False, pull=False, nocache=True, dockerfile='Dockerfile.b', cache_from=None, labels=None, buildargs={'image_tag': 'dummy11'}, network_mode=None, target=None, shmsize=None, extra_hosts=None, container_limits={'memory': None}, gzip=False, isolation=None, platform=None)
docker.api.build._set_auth_headers: Looking for auth config
docker.api.build._set_auth_headers: Sending auth config ('https://index.docker.io/v1/')
urllib3.connectionpool._make_request: http://localhost:None "POST /v1.25/build?t=b%3Adummy11&q=False&nocache=True&rm=True&forcerm=False&pull=False&dockerfile=Dockerfile.b&buildargs=%7B%22image_tag%22%3A+%22dummy11%22%7D HTTP/1.1" 200 None
compose.cli.verbose_proxy.proxy_callable: docker build -> <generator object APIClient._stream_helper at 0x7fceea1076d0>
Step 1/3 : ARG image_tag
Step 2/3 : FROM a:${image_tag}
 ---> 9461b6fa1a49
Step 3/3 : RUN sleep 5
 ---> Running in 2c4d742c83be
Removing intermediate container 2c4d742c83be
 ---> 0f50a8a57aa0
Successfully built 0f50a8a57aa0
Successfully tagged b:dummy11
compose.cli.verbose_proxy.proxy_callable: docker close <- ()
compose.cli.verbose_proxy.proxy_callable: docker close -> None

parallel.log

$ IMAGE_TAG=dummy12 docker-compose --verbose build --no-cache --parallel
compose.config.config.find: Using configuration files: ./docker-compose.yml
docker.utils.config.find_config_file: Trying paths: ['/home/giorgio/.docker/config.json', '/home/giorgio/.dockercfg']
docker.utils.config.find_config_file: Found file at path: /home/giorgio/.docker/config.json
docker.auth.load_config: Found 'auths' section
docker.auth.parse_auth: Found entry (registry='https://index.docker.io/v1/', username='giorgiosironi')
urllib3.connectionpool._make_request: http://localhost:None "GET /v1.25/version HTTP/1.1" 200 562
compose.cli.command.get_client: docker-compose version 1.24.1, build 4667896b
docker-py version: 3.7.3
CPython version: 3.6.8
OpenSSL version: OpenSSL 1.1.0j  20 Nov 2018
compose.cli.command.get_client: Docker base_url: http+docker://localhost
compose.cli.command.get_client: Docker version: Platform={'Name': 'Docker Engine - Community'}, Components=[{'Name': 'Engine', 'Version': '18.09.6', 'Details': {'ApiVersion': '1.39', 'Arch': 'amd64', 'BuildTime': '2019-05-04T01:59:36.000000000+00:00', 'Experimental': 'false', 'GitCommit': '481bc77', 'GoVersion': 'go1.10.8', 'KernelVersion': '4.15.0-51-generic', 'MinAPIVersion': '1.12', 'Os': 'linux'}}], Version=18.09.6, ApiVersion=1.39, MinAPIVersion=1.12, GitCommit=481bc77, GoVersion=go1.10.8, Os=linux, Arch=amd64, KernelVersion=4.15.0-51-generic, BuildTime=2019-05-04T01:59:36.000000000+00:00
compose.cli.verbose_proxy.proxy_callable: docker inspect_network <- ('dockercomposeparallel_default')
urllib3.connectionpool._make_request: http://localhost:None "GET /v1.25/networks/dockercomposeparallel_default HTTP/1.1" 404 62
Building a ...
Building b ...
compose.parallel.feed_queue: Pending: {<Service: a>, <Service: b>}
compose.parallel.feed_queue: Starting producer thread for <Service: a>
compose.service.build: Building a
compose.parallel.feed_queue: Starting producer thread for <Service: b>
compose.cli.verbose_proxy.proxy_callable: docker build <- (path='/home/giorgio/code/docker-compose-parallel', tag='a:dummy12', rm=True, forcerm=False, pull=False, nocache=True, dockerfile='Dockerfile.a', cache_from=None, labels=None, buildargs={}, network_mode=None, target=None, shmsize=None, extra_hosts=None, container_limits={'memory': None}, gzip=False, isolation=None, platform=None)
compose.service.build: Building b
compose.cli.verbose_proxy.proxy_callable: docker build <- (path='/home/giorgio/code/docker-compose-parallel', tag='b:dummy12', rm=True, forcerm=False, pull=False, nocache=True, dockerfile='Dockerfile.b', cache_from=None, labels=None, buildargs={'image_tag': 'dummy12'}, network_mode=None, target=None, shmsize=None, extra_hosts=None, container_limits={'memory': None}, gzip=False, isolation=None, platform=None)
docker.api.build._set_auth_headers: Looking for auth config
docker.api.build._set_auth_headers: Looking for auth config
docker.api.build._set_auth_headers: Sending auth config ('https://index.docker.io/v1/')
docker.api.build._set_auth_headers: Sending auth config ('https://index.docker.io/v1/')
urllib3.connectionpool._make_request: http://localhost:None "POST /v1.25/build?t=a%3Adummy12&q=False&nocache=True&rm=True&forcerm=False&pull=False&dockerfile=Dockerfile.a HTTP/1.1" 200 None
compose.cli.verbose_proxy.proxy_callable: docker build -> <generator object APIClient._stream_helper at 0x7fc256ee7570>
Step 1/2 : FROM busybox
 ---> 64f5d945efcc
Step 2/2 : RUN sleep 5
compose.parallel.feed_queue: Pending: set()
urllib3.connectionpool._make_request: http://localhost:None "POST /v1.25/build?t=b%3Adummy12&q=False&nocache=True&rm=True&forcerm=False&pull=False&dockerfile=Dockerfile.b&buildargs=%7B%22image_tag%22%3A+%22dummy12%22%7D HTTP/1.1" 200 None
compose.cli.verbose_proxy.proxy_callable: docker build -> <generator object APIClient._stream_helper at 0x7fc256ee75c8>
Step 1/3 : ARG image_tag
Step 2/3 : FROM a:${image_tag}
compose.parallel.feed_queue: Pending: set()
 ---> Running in bef36cb597b1
compose.parallel.feed_queue: Pending: set()
compose.parallel.feed_queue: Pending: set()
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compose.parallel.feed_queue: Pending: set()
compose.parallel.feed_queue: Pending: set()
compose.parallel.feed_queue: Pending: set()
compose.parallel.feed_queue: Pending: set()
Removing intermediate container bef36cb597b1
 ---> 71427214bddc
Successfully built 71427214bddc
Successfully tagged a:dummy12
compose.cli.verbose_proxy.proxy_callable: docker close <- ()
Building a ... done
compose.parallel.parallel_execute_iter: Finished processing: <Service: a>
compose.parallel.feed_queue: Pending: set()
compose.parallel.feed_queue: Pending: set()
compose.parallel.feed_queue: Pending: set()
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compose.parallel.parallel_execute_iter: Failed: <Service: b>
compose.parallel.feed_queue: Pending: set()

ERROR: for b  (<Service: b>, "pull access denied for a, repository does not exist or may require 'docker login'")
ERROR: compose.cli.main.main: Service 'b' failed to build: pull access denied for a, repository does not exist or may require 'docker login'