Merge pull request #6140 from docker/4688_no_sequential_ids

Add randomly generated slug to container names to prevent collisions

compose/const.py

@@ -15,6 +15,7 @@ LABEL_PROJECT = 'com.docker.compose.project'
 LABEL_SERVICE = 'com.docker.compose.service'
 LABEL_NETWORK = 'com.docker.compose.network'
 LABEL_VERSION = 'com.docker.compose.version'
+LABEL_SLUG = 'com.docker.compose.slug'
 LABEL_VOLUME = 'com.docker.compose.volume'
 LABEL_CONFIG_HASH = 'com.docker.compose.config-hash'
 NANOCPUS_SCALE = 1000000000

compose/container.py

@@ -9,7 +9,9 @@ from docker.errors import ImageNotFound
 from .const import LABEL_CONTAINER_NUMBER
 from .const import LABEL_PROJECT
 from .const import LABEL_SERVICE
+from .const import LABEL_SLUG
 from .const import LABEL_VERSION
+from .utils import truncate_id
 from .version import ComposeVersion
 
 
@@ -80,7 +82,7 @@ class Container(object):
     @property
     def name_without_project(self):
         if self.name.startswith('{0}_{1}'.format(self.project, self.service)):
-            return '{0}_{1}'.format(self.service, self.number)
+            return '{0}_{1}{2}'.format(self.service, self.number, '_' + self.slug if self.slug else '')
         else:
             return self.name
 
@@ -92,6 +94,14 @@ class Container(object):
                 self.short_id, LABEL_CONTAINER_NUMBER))
         return int(number)
 
+    @property
+    def slug(self):
+        return truncate_id(self.full_slug)
+
+    @property
+    def full_slug(self):
+        return self.labels.get(LABEL_SLUG)
+
     @property
     def ports(self):
         self.inspect_if_not_inspected()

compose/project.py

@@ -31,7 +31,6 @@ from .service import ConvergenceStrategy
 from .service import NetworkMode
 from .service import PidMode
 from .service import Service
-from .service import ServiceName
 from .service import ServiceNetworkMode
 from .service import ServicePidMode
 from .utils import microseconds_from_time_nano
@@ -198,25 +197,6 @@ class Project(object):
             service.remove_duplicate_containers()
         return services
 
-    def get_scaled_services(self, services, scale_override):
-        """
-        Returns a list of this project's services as scaled ServiceName objects.
-
-        services: a list of Service objects
-        scale_override: a dict with the scale to apply to each service (k: service_name, v: scale)
-        """
-        service_names = []
-        for service in services:
-            if service.name in scale_override:
-                scale = scale_override[service.name]
-            else:
-                scale = service.scale_num
-
-            for i in range(1, scale + 1):
-                service_names.append(ServiceName(self.name, service.name, i))
-
-        return service_names
-
     def get_links(self, service_dict):
         links = []
         if 'links' in service_dict:
@@ -494,7 +474,6 @@ class Project(object):
             svc.ensure_image_exists(do_build=do_build, silent=silent)
         plans = self._get_convergence_plans(
             services, strategy, always_recreate_deps=always_recreate_deps)
-        scaled_services = self.get_scaled_services(services, scale_override)
 
         def do(service):
 
@@ -505,7 +484,6 @@ class Project(object):
                 scale_override=scale_override.get(service.name),
                 rescale=rescale,
                 start=start,
-                project_services=scaled_services,
                 reset_container_image=reset_container_image,
                 renew_anonymous_volumes=renew_anonymous_volumes,
             )

compose/service.py

@@ -40,6 +40,7 @@ from .const import LABEL_CONTAINER_NUMBER
 from .const import LABEL_ONE_OFF
 from .const import LABEL_PROJECT
 from .const import LABEL_SERVICE
+from .const import LABEL_SLUG
 from .const import LABEL_VERSION
 from .const import NANOCPUS_SCALE
 from .container import Container
@@ -49,9 +50,11 @@ from .errors import OperationFailedError
 from .parallel import parallel_execute
 from .progress_stream import stream_output
 from .progress_stream import StreamOutputError
+from .utils import generate_random_id
 from .utils import json_hash
 from .utils import parse_bytes
 from .utils import parse_seconds_float
+from .utils import truncate_id
 
 
 log = logging.getLogger(__name__)
@@ -122,7 +125,7 @@ class NoSuchImageError(Exception):
     pass
 
 
-ServiceName = namedtuple('ServiceName', 'project service number')
+ServiceName = namedtuple('ServiceName', 'project service number slug')
 
 
 ConvergencePlan = namedtuple('ConvergencePlan', 'action containers')
@@ -219,7 +222,6 @@ class Service(object):
         """Return a :class:`compose.container.Container` for this service. The
         container must be active, and match `number`.
         """
-
         for container in self.containers(labels=['{0}={1}'.format(LABEL_CONTAINER_NUMBER, number)]):
             return container
 
@@ -425,27 +427,33 @@ class Service(object):
 
         return has_diverged
 
-    def _execute_convergence_create(self, scale, detached, start, project_services=None):
+    def _execute_convergence_create(self, scale, detached, start):
-            i = self._next_container_number()
 
-            def create_and_start(service, n):
+        i = self._next_container_number()
-                container = service.create_container(number=n, quiet=True)
-                if not detached:
-                    container.attach_log_stream()
-                if start:
-                    self.start_container(container)
-                return container
 
-            containers, errors = parallel_execute(
+        def create_and_start(service, n):
-                [ServiceName(self.project, self.name, index) for index in range(i, i + scale)],
+            container = service.create_container(number=n, quiet=True)
-                lambda service_name: create_and_start(self, service_name.number),
+            if not detached:
-                lambda service_name: self.get_container_name(service_name.service, service_name.number),
+                container.attach_log_stream()
-                "Creating"
+            if start:
-            )
+                self.start_container(container)
-            for error in errors.values():
+            return container
-                raise OperationFailedError(error)
 
-            return containers
+        containers, errors = parallel_execute(
+            [
+                ServiceName(self.project, self.name, index, generate_random_id())
+                for index in range(i, i + scale)
+            ],
+            lambda service_name: create_and_start(self, service_name.number),
+            lambda service_name: self.get_container_name(
+                service_name.service, service_name.number, service_name.slug
+            ),
+            "Creating"
+        )
+        for error in errors.values():
+            raise OperationFailedError(error)
+
+        return containers
 
     def _execute_convergence_recreate(self, containers, scale, timeout, detached, start,
                                       renew_anonymous_volumes):
@@ -508,8 +516,8 @@ class Service(object):
 
     def execute_convergence_plan(self, plan, timeout=None, detached=False,
                                  start=True, scale_override=None,
-                                 rescale=True, project_services=None,
+                                 rescale=True, reset_container_image=False,
-                                 reset_container_image=False, renew_anonymous_volumes=False):
+                                 renew_anonymous_volumes=False):
         (action, containers) = plan
         scale = scale_override if scale_override is not None else self.scale_num
         containers = sorted(containers, key=attrgetter('number'))
@@ -518,7 +526,7 @@ class Service(object):
 
         if action == 'create':
             return self._execute_convergence_create(
-                scale, detached, start, project_services
+                scale, detached, start
             )
 
         # The create action needs always needs an initial scale, but otherwise,
@@ -568,7 +576,7 @@ class Service(object):
         container.rename_to_tmp_name()
         new_container = self.create_container(
             previous_container=container if not renew_anonymous_volumes else None,
-            number=container.labels.get(LABEL_CONTAINER_NUMBER),
+            number=container.number,
             quiet=True,
         )
         if attach_logs:
@@ -723,8 +731,6 @@ class Service(object):
     def get_volumes_from_names(self):
         return [s.source.name for s in self.volumes_from if isinstance(s.source, Service)]
 
-    # TODO: this would benefit from github.com/docker/docker/pull/14699
-    # to remove the need to inspect every container
     def _next_container_number(self, one_off=False):
         containers = itertools.chain(
             self._fetch_containers(
@@ -813,6 +819,7 @@ class Service(object):
             one_off=False,
             previous_container=None):
         add_config_hash = (not one_off and not override_options)
+        slug = generate_random_id() if previous_container is None else previous_container.full_slug
 
         container_options = dict(
             (k, self.options[k])
@@ -821,7 +828,7 @@ class Service(object):
         container_options.update(override_options)
 
         if not container_options.get('name'):
-            container_options['name'] = self.get_container_name(self.name, number, one_off)
+            container_options['name'] = self.get_container_name(self.name, number, slug, one_off)
 
         container_options.setdefault('detach', True)
 
@@ -873,7 +880,9 @@ class Service(object):
             container_options.get('labels', {}),
             self.labels(one_off=one_off),
             number,
-            self.config_hash if add_config_hash else None)
+            self.config_hash if add_config_hash else None,
+            slug
+        )
 
         # Delete options which are only used in HostConfig
         for key in HOST_CONFIG_KEYS:
@@ -1111,12 +1120,12 @@ class Service(object):
     def custom_container_name(self):
         return self.options.get('container_name')
 
-    def get_container_name(self, service_name, number, one_off=False):
+    def get_container_name(self, service_name, number, slug, one_off=False):
         if self.custom_container_name and not one_off:
             return self.custom_container_name
 
         container_name = build_container_name(
-            self.project, service_name, number, one_off,
+            self.project, service_name, number, slug, one_off,
         )
         ext_links_origins = [l.split(':')[0] for l in self.options.get('external_links', [])]
         if container_name in ext_links_origins:
@@ -1373,11 +1382,13 @@ class ServiceNetworkMode(object):
 # Names
 
 
-def build_container_name(project, service, number, one_off=False):
+def build_container_name(project, service, number, slug, one_off=False):
     bits = [project.lstrip('-_'), service]
     if one_off:
         bits.append('run')
-    return '_'.join(bits + [str(number)])
+    return '_'.join(
+        bits + ([str(number), truncate_id(slug)] if slug else [str(number)])
+    )
 
 
 # Images
@@ -1558,10 +1569,11 @@ def build_mount(mount_spec):
 # Labels
 
 
-def build_container_labels(label_options, service_labels, number, config_hash):
+def build_container_labels(label_options, service_labels, number, config_hash, slug):
     labels = dict(label_options or {})
     labels.update(label.split('=', 1) for label in service_labels)
     labels[LABEL_CONTAINER_NUMBER] = str(number)
+    labels[LABEL_SLUG] = slug
     labels[LABEL_VERSION] = __version__
 
     if config_hash:

compose/utils.py

@@ -7,6 +7,7 @@ import json
 import json.decoder
 import logging
 import ntpath
+import random
 
 import six
 from docker.errors import DockerException
@@ -151,3 +152,21 @@ def unquote_path(s):
     if s[0] == '"' and s[-1] == '"':
         return s[1:-1]
     return s
+
+
+def generate_random_id():
+    while True:
+        val = hex(random.getrandbits(32 * 8))[2:-1]
+        try:
+            int(truncate_id(val))
+            continue
+        except ValueError:
+            return val
+
+
+def truncate_id(value):
+    if ':' in value:
+        value = value[value.index(':') + 1:]
+    if len(value) > 12:
+        return value[:12]
+    return value

script/test/versions.py

@@ -50,7 +50,6 @@ class Version(namedtuple('_Version', 'major minor patch stage edition')):
                 stage = None
             elif '-' in stage:
                 edition, stage = stage.split('-')
-
         major, minor, patch = version.split('.', 3)
         return cls(major, minor, patch, stage, edition)
 

tests/acceptance/cli_test.py

@@ -99,7 +99,14 @@ class ContainerStateCondition(object):
 
     def __call__(self):
         try:
-            container = self.client.inspect_container(self.name)
+            if self.name.endswith('*'):
+                ctnrs = self.client.containers(all=True, filters={'name': self.name[:-1]})
+                if len(ctnrs) > 0:
+                    container = self.client.inspect_container(ctnrs[0]['Id'])
+                else:
+                    return False
+            else:
+                container = self.client.inspect_container(self.name)
             return container['State']['Status'] == self.status
         except errors.APIError:
             return False
@@ -1019,11 +1026,15 @@ class CLITestCase(DockerClientTestCase):
     def test_up_attached(self):
         self.base_dir = 'tests/fixtures/echo-services'
         result = self.dispatch(['up', '--no-color'])
+        simple_name = self.project.get_service('simple').containers(stopped=True)[0].name_without_project
+        another_name = self.project.get_service('another').containers(
+            stopped=True
+        )[0].name_without_project
 
-        assert 'simple_1   | simple' in result.stdout
+        assert '{} | simple'.format(simple_name) in result.stdout
-        assert 'another_1  | another' in result.stdout
+        assert '{} | another'.format(another_name) in result.stdout
-        assert 'simple_1 exited with code 0' in result.stdout
+        assert '{} exited with code 0'.format(simple_name) in result.stdout
-        assert 'another_1 exited with code 0' in result.stdout
+        assert '{} exited with code 0'.format(another_name) in result.stdout
 
     @v2_only()
     def test_up(self):
@@ -1727,11 +1738,12 @@ class CLITestCase(DockerClientTestCase):
     def test_run_rm(self):
         self.base_dir = 'tests/fixtures/volume'
         proc = start_process(self.base_dir, ['run', '--rm', 'test'])
+        service = self.project.get_service('test')
         wait_on_condition(ContainerStateCondition(
             self.project.client,
-            'volume_test_run_1',
+            'volume_test_run_*',
-            'running'))
+            'running')
-        service = self.project.get_service('test')
+        )
         containers = service.containers(one_off=OneOffFilter.only)
         assert len(containers) == 1
         mounts = containers[0].get('Mounts')
@@ -2054,39 +2066,39 @@ class CLITestCase(DockerClientTestCase):
         proc = start_process(self.base_dir, ['run', '-T', 'simple', 'top'])
         wait_on_condition(ContainerStateCondition(
             self.project.client,
-            'simple-composefile_simple_run_1',
+            'simple-composefile_simple_run_*',
             'running'))
 
         os.kill(proc.pid, signal.SIGINT)
         wait_on_condition(ContainerStateCondition(
             self.project.client,
-            'simple-composefile_simple_run_1',
+            'simple-composefile_simple_run_*',
             'exited'))
 
     def test_run_handles_sigterm(self):
         proc = start_process(self.base_dir, ['run', '-T', 'simple', 'top'])
         wait_on_condition(ContainerStateCondition(
             self.project.client,
-            'simple-composefile_simple_run_1',
+            'simple-composefile_simple_run_*',
             'running'))
 
         os.kill(proc.pid, signal.SIGTERM)
         wait_on_condition(ContainerStateCondition(
             self.project.client,
-            'simple-composefile_simple_run_1',
+            'simple-composefile_simple_run_*',
             'exited'))
 
     def test_run_handles_sighup(self):
         proc = start_process(self.base_dir, ['run', '-T', 'simple', 'top'])
         wait_on_condition(ContainerStateCondition(
             self.project.client,
-            'simple-composefile_simple_run_1',
+            'simple-composefile_simple_run_*',
             'running'))
 
         os.kill(proc.pid, signal.SIGHUP)
         wait_on_condition(ContainerStateCondition(
             self.project.client,
-            'simple-composefile_simple_run_1',
+            'simple-composefile_simple_run_*',
             'exited'))
 
     @mock.patch.dict(os.environ)
@@ -2286,34 +2298,44 @@ class CLITestCase(DockerClientTestCase):
         proc = start_process(self.base_dir, ['logs', '-f'])
 
         self.dispatch(['up', '-d', 'another'])
-        wait_on_condition(ContainerStateCondition(
+        another_name = self.project.get_service('another').get_container().name_without_project
-            self.project.client,
+        wait_on_condition(
-            'logs-composefile_another_1',
+            ContainerStateCondition(
-            'exited'))
+                self.project.client,
+                'logs-composefile_another_*',
+                'exited'
+            )
+        )
 
+        simple_name = self.project.get_service('simple').get_container().name_without_project
         self.dispatch(['kill', 'simple'])
 
         result = wait_on_process(proc)
 
         assert 'hello' in result.stdout
         assert 'test' in result.stdout
-        assert 'logs-composefile_another_1 exited with code 0' in result.stdout
+        assert '{} exited with code 0'.format(another_name) in result.stdout
-        assert 'logs-composefile_simple_1 exited with code 137' in result.stdout
+        assert '{} exited with code 137'.format(simple_name) in result.stdout
 
     def test_logs_follow_logs_from_restarted_containers(self):
         self.base_dir = 'tests/fixtures/logs-restart-composefile'
         proc = start_process(self.base_dir, ['up'])
 
-        wait_on_condition(ContainerStateCondition(
+        wait_on_condition(
-            self.project.client,
+            ContainerStateCondition(
-            'logs-restart-composefile_another_1',
+                self.project.client,
-            'exited'))
+                'logs-restart-composefile_another_*',
-
+                'exited'
+            )
+        )
         self.dispatch(['kill', 'simple'])
 
         result = wait_on_process(proc)
 
-        assert result.stdout.count('logs-restart-composefile_another_1 exited with code 1') == 3
+        assert len(re.findall(
+            r'logs-restart-composefile_another_1_[a-f0-9]{12} exited with code 1',
+            result.stdout
+        )) == 3
         assert result.stdout.count('world') == 3
 
     def test_logs_default(self):
@@ -2346,10 +2368,10 @@ class CLITestCase(DockerClientTestCase):
         self.dispatch(['up'])
 
         result = self.dispatch(['logs', '--tail', '2'])
-        assert 'c\n' in result.stdout
+        assert 'y\n' in result.stdout
-        assert 'd\n' in result.stdout
+        assert 'z\n' in result.stdout
-        assert 'a\n' not in result.stdout
+        assert 'w\n' not in result.stdout
-        assert 'b\n' not in result.stdout
+        assert 'x\n' not in result.stdout
 
     def test_kill(self):
         self.dispatch(['up', '-d'], None)
@@ -2523,9 +2545,9 @@ class CLITestCase(DockerClientTestCase):
                 result = self.dispatch(['port', '--index=' + str(index), 'simple', str(number)])
             return result.stdout.rstrip()
 
-        assert get_port(3000) == containers[0].get_local_port(3000)
+        assert get_port(3000) in (containers[0].get_local_port(3000), containers[1].get_local_port(3000))
-        assert get_port(3000, index=1) == containers[0].get_local_port(3000)
+        assert get_port(3000, index=containers[0].number) == containers[0].get_local_port(3000)
-        assert get_port(3000, index=2) == containers[1].get_local_port(3000)
+        assert get_port(3000, index=containers[1].number) == containers[1].get_local_port(3000)
         assert get_port(3002) == ""
 
     def test_events_json(self):
@@ -2561,7 +2583,7 @@ class CLITestCase(DockerClientTestCase):
 
         container, = self.project.containers()
         expected_template = ' container {} {}'
-        expected_meta_info = ['image=busybox:latest', 'name=simple-composefile_simple_1']
+        expected_meta_info = ['image=busybox:latest', 'name=simple-composefile_simple_']
 
         assert expected_template.format('create', container.id) in lines[0]
         assert expected_template.format('start', container.id) in lines[1]
@@ -2643,8 +2665,11 @@ class CLITestCase(DockerClientTestCase):
 
         assert len(containers) == 2
         web = containers[1]
+        db_name = containers[0].name_without_project
 
-        assert set(get_links(web)) == set(['db', 'mydb_1', 'extends_mydb_1'])
+        assert set(get_links(web)) == set(
+            ['db', db_name, 'extends_{}'.format(db_name)]
+        )
 
         expected_env = set([
             "FOO=1",
@@ -2677,11 +2702,11 @@ class CLITestCase(DockerClientTestCase):
         self.base_dir = 'tests/fixtures/exit-code-from'
         proc = start_process(
             self.base_dir,
-            ['up', '--abort-on-container-exit', '--exit-code-from', 'another'])
+            ['up', '--abort-on-container-exit', '--exit-code-from', 'another']
+        )
 
         result = wait_on_process(proc, returncode=1)
-
+        assert re.findall(r'exit-code-from_another_1_[a-f0-9]{12} exited with code 1', result.stdout)
-        assert 'exit-code-from_another_1 exited with code 1' in result.stdout
 
     def test_exit_code_from_signal_stop(self):
         self.base_dir = 'tests/fixtures/exit-code-from'
@@ -2690,13 +2715,14 @@ class CLITestCase(DockerClientTestCase):
             ['up', '--abort-on-container-exit', '--exit-code-from', 'simple']
         )
         result = wait_on_process(proc, returncode=137)  # SIGKILL
-        assert 'exit-code-from_another_1 exited with code 1' in result.stdout
+        name = self.project.get_service('another').containers(stopped=True)[0].name_without_project
+        assert '{} exited with code 1'.format(name) in result.stdout
 
     def test_images(self):
         self.project.get_service('simple').create_container()
         result = self.dispatch(['images'])
         assert 'busybox' in result.stdout
-        assert 'simple-composefile_simple_1' in result.stdout
+        assert 'simple-composefile_simple_' in result.stdout
 
     def test_images_default_composefile(self):
         self.base_dir = 'tests/fixtures/multiple-composefiles'

tests/fixtures/logs-tail-composefile/docker-compose.yml

@@ -1,3 +1,3 @@
 simple:
   image: busybox:latest
-  command: sh -c "echo a && echo b && echo c && echo d"
+  command: sh -c "echo w && echo x && echo y && echo z"

tests/integration/project_test.py

@@ -90,7 +90,8 @@ class ProjectTest(DockerClientTestCase):
         project.up()
 
         containers = project.containers(['web'])
-        assert [c.name for c in containers] == ['composetest_web_1']
+        assert len(containers) == 1
+        assert containers[0].name.startswith('composetest_web_')
 
     def test_containers_with_extra_service(self):
         web = self.create_service('web')
@@ -464,14 +465,14 @@ class ProjectTest(DockerClientTestCase):
 
         project.up(['db'])
         assert len(project.containers()) == 1
-        old_db_id = project.containers()[0].id
         container, = project.containers()
+        old_db_id = container.id
         db_volume_path = container.get_mount('/var/db')['Source']
 
         project.up(strategy=ConvergenceStrategy.never)
         assert len(project.containers()) == 2
 
-        db_container = [c for c in project.containers() if 'db' in c.name][0]
+        db_container = [c for c in project.containers() if c.name == container.name][0]
         assert db_container.id == old_db_id
         assert db_container.get_mount('/var/db')['Source'] == db_volume_path
 
@@ -1944,7 +1945,7 @@ class ProjectTest(DockerClientTestCase):
 
         containers = project.containers(stopped=True)
         assert len(containers) == 1
-        assert containers[0].name == 'underscoretest_svc1_1'
+        assert containers[0].name.startswith('underscoretest_svc1_')
         assert containers[0].project == '_underscoretest'
 
         full_vol_name = 'underscoretest_foo'
@@ -1965,7 +1966,7 @@ class ProjectTest(DockerClientTestCase):
 
         containers = project2.containers(stopped=True)
         assert len(containers) == 1
-        assert containers[0].name == 'dashtest_svc1_1'
+        assert containers[0].name.startswith('dashtest_svc1_')
         assert containers[0].project == '-dashtest'
 
         full_vol_name = 'dashtest_foo'

tests/integration/service_test.py

@@ -32,6 +32,7 @@ from compose.const import LABEL_CONTAINER_NUMBER
 from compose.const import LABEL_ONE_OFF
 from compose.const import LABEL_PROJECT
 from compose.const import LABEL_SERVICE
+from compose.const import LABEL_SLUG
 from compose.const import LABEL_VERSION
 from compose.container import Container
 from compose.errors import OperationFailedError
@@ -67,7 +68,7 @@ class ServiceTest(DockerClientTestCase):
         create_and_start_container(foo)
 
         assert len(foo.containers()) == 1
-        assert foo.containers()[0].name == 'composetest_foo_1'
+        assert foo.containers()[0].name.startswith('composetest_foo_')
         assert len(bar.containers()) == 0
 
         create_and_start_container(bar)
@@ -77,8 +78,8 @@ class ServiceTest(DockerClientTestCase):
         assert len(bar.containers()) == 2
 
         names = [c.name for c in bar.containers()]
-        assert 'composetest_bar_1' in names
+        assert len(names) == 2
-        assert 'composetest_bar_2' in names
+        assert all(name.startswith('composetest_bar_') for name in names)
 
     def test_containers_one_off(self):
         db = self.create_service('db')
@@ -89,18 +90,18 @@ class ServiceTest(DockerClientTestCase):
     def test_project_is_added_to_container_name(self):
         service = self.create_service('web')
         create_and_start_container(service)
-        assert service.containers()[0].name == 'composetest_web_1'
+        assert service.containers()[0].name.startswith('composetest_web_')
 
     def test_create_container_with_one_off(self):
         db = self.create_service('db')
         container = db.create_container(one_off=True)
-        assert container.name == 'composetest_db_run_1'
+        assert container.name.startswith('composetest_db_run_')
 
     def test_create_container_with_one_off_when_existing_container_is_running(self):
         db = self.create_service('db')
         db.start()
         container = db.create_container(one_off=True)
-        assert container.name == 'composetest_db_run_1'
+        assert container.name.startswith('composetest_db_run_')
 
     def test_create_container_with_unspecified_volume(self):
         service = self.create_service('db', volumes=[VolumeSpec.parse('/var/db')])
@@ -489,7 +490,7 @@ class ServiceTest(DockerClientTestCase):
         assert old_container.get('Config.Entrypoint') == ['top']
         assert old_container.get('Config.Cmd') == ['-d', '1']
         assert 'FOO=1' in old_container.get('Config.Env')
-        assert old_container.name == 'composetest_db_1'
+        assert old_container.name.startswith('composetest_db_')
         service.start_container(old_container)
         old_container.inspect()  # reload volume data
         volume_path = old_container.get_mount('/etc')['Source']
@@ -503,7 +504,7 @@ class ServiceTest(DockerClientTestCase):
         assert new_container.get('Config.Entrypoint') == ['top']
         assert new_container.get('Config.Cmd') == ['-d', '1']
         assert 'FOO=2' in new_container.get('Config.Env')
-        assert new_container.name == 'composetest_db_1'
+        assert new_container.name.startswith('composetest_db_')
         assert new_container.get_mount('/etc')['Source'] == volume_path
         if not is_cluster(self.client):
             assert (
@@ -836,13 +837,13 @@ class ServiceTest(DockerClientTestCase):
         db = self.create_service('db')
         web = self.create_service('web', links=[(db, None)])
 
-        create_and_start_container(db)
+        db1 = create_and_start_container(db)
-        create_and_start_container(db)
+        db2 = create_and_start_container(db)
         create_and_start_container(web)
 
         assert set(get_links(web.containers()[0])) == set([
-            'composetest_db_1', 'db_1',
+            db1.name, db1.name_without_project,
-            'composetest_db_2', 'db_2',
+            db2.name, db2.name_without_project,
             'db'
         ])
 
@@ -851,30 +852,33 @@ class ServiceTest(DockerClientTestCase):
         db = self.create_service('db')
         web = self.create_service('web', links=[(db, 'custom_link_name')])
 
-        create_and_start_container(db)
+        db1 = create_and_start_container(db)
-        create_and_start_container(db)
+        db2 = create_and_start_container(db)
         create_and_start_container(web)
 
         assert set(get_links(web.containers()[0])) == set([
-            'composetest_db_1', 'db_1',
+            db1.name, db1.name_without_project,
-            'composetest_db_2', 'db_2',
+            db2.name, db2.name_without_project,
             'custom_link_name'
         ])
 
     @no_cluster('No legacy links support in Swarm')
     def test_start_container_with_external_links(self):
         db = self.create_service('db')
-        web = self.create_service('web', external_links=['composetest_db_1',
+        db_ctnrs = [create_and_start_container(db) for _ in range(3)]
-                                                         'composetest_db_2',
+        web = self.create_service(
-                                                         'composetest_db_3:db_3'])
+            'web', external_links=[
+                db_ctnrs[0].name,
+                db_ctnrs[1].name,
+                '{}:db_3'.format(db_ctnrs[2].name)
+            ]
+        )
 
-        for _ in range(3):
-            create_and_start_container(db)
         create_and_start_container(web)
 
         assert set(get_links(web.containers()[0])) == set([
-            'composetest_db_1',
+            db_ctnrs[0].name,
-            'composetest_db_2',
+            db_ctnrs[1].name,
             'db_3'
         ])
 
@@ -892,14 +896,14 @@ class ServiceTest(DockerClientTestCase):
     def test_start_one_off_container_creates_links_to_its_own_service(self):
         db = self.create_service('db')
 
-        create_and_start_container(db)
+        db1 = create_and_start_container(db)
-        create_and_start_container(db)
+        db2 = create_and_start_container(db)
 
         c = create_and_start_container(db, one_off=OneOffFilter.only)
 
         assert set(get_links(c)) == set([
-            'composetest_db_1', 'db_1',
+            db1.name, db1.name_without_project,
-            'composetest_db_2', 'db_2',
+            db2.name, db2.name_without_project,
             'db'
         ])
 
@@ -1249,10 +1253,9 @@ class ServiceTest(DockerClientTestCase):
         test that those containers are restarted and not removed/recreated.
         """
         service = self.create_service('web')
-        next_number = service._next_container_number()
+        valid_numbers = [service._next_container_number(), service._next_container_number()]
-        valid_numbers = [next_number, next_number + 1]
+        service.create_container(number=valid_numbers[0])
-        service.create_container(number=next_number)
+        service.create_container(number=valid_numbers[1])
-        service.create_container(number=next_number + 1)
 
         ParallelStreamWriter.instance = None
         with mock.patch('sys.stderr', new_callable=StringIO) as mock_stderr:
@@ -1310,10 +1313,8 @@ class ServiceTest(DockerClientTestCase):
 
         assert len(service.containers()) == 1
         assert service.containers()[0].is_running
-        assert (
+        assert "ERROR: for composetest_web_" in mock_stderr.getvalue()
-            "ERROR: for composetest_web_2  Cannot create container for service"
+        assert "Cannot create container for service web: Boom" in mock_stderr.getvalue()
-            " web: Boom" in mock_stderr.getvalue()
-        )
 
     def test_scale_with_unexpected_exception(self):
         """Test that when scaling if the API returns an error, that is not of type
@@ -1580,18 +1581,20 @@ class ServiceTest(DockerClientTestCase):
         }
 
         compose_labels = {
-            LABEL_CONTAINER_NUMBER: '1',
             LABEL_ONE_OFF: 'False',
             LABEL_PROJECT: 'composetest',
             LABEL_SERVICE: 'web',
             LABEL_VERSION: __version__,
+            LABEL_CONTAINER_NUMBER: '1'
         }
         expected = dict(labels_dict, **compose_labels)
 
         service = self.create_service('web', labels=labels_dict)
-        labels = create_and_start_container(service).labels.items()
+        ctnr = create_and_start_container(service)
+        labels = ctnr.labels.items()
         for pair in expected.items():
             assert pair in labels
+        assert ctnr.labels[LABEL_SLUG] == ctnr.full_slug
 
     def test_empty_labels(self):
         labels_dict = {'foo': '', 'bar': ''}
@@ -1655,7 +1658,7 @@ class ServiceTest(DockerClientTestCase):
     def test_duplicate_containers(self):
         service = self.create_service('web')
 
-        options = service._get_container_create_options({}, 1)
+        options = service._get_container_create_options({}, service._next_container_number())
         original = Container.create(service.client, **options)
 
         assert set(service.containers(stopped=True)) == set([original])

tests/integration/state_test.py

@@ -55,8 +55,8 @@ class BasicProjectTest(ProjectTestCase):
 
     def test_partial_change(self):
         old_containers = self.run_up(self.cfg)
-        old_db = [c for c in old_containers if c.name_without_project == 'db_1'][0]
+        old_db = [c for c in old_containers if c.name_without_project.startswith('db_')][0]
-        old_web = [c for c in old_containers if c.name_without_project == 'web_1'][0]
+        old_web = [c for c in old_containers if c.name_without_project.startswith('web_')][0]
 
         self.cfg['web']['command'] = '/bin/true'
 
@@ -71,7 +71,7 @@ class BasicProjectTest(ProjectTestCase):
 
         created = list(new_containers - old_containers)
         assert len(created) == 1
-        assert created[0].name_without_project == 'web_1'
+        assert created[0].name_without_project == old_web.name_without_project
         assert created[0].get('Config.Cmd') == ['/bin/true']
 
     def test_all_change(self):
@@ -114,7 +114,7 @@ class ProjectWithDependenciesTest(ProjectTestCase):
 
     def test_up(self):
         containers = self.run_up(self.cfg)
-        assert set(c.name_without_project for c in containers) == set(['db_1', 'web_1', 'nginx_1'])
+        assert set(c.service for c in containers) == set(['db', 'web', 'nginx'])
 
     def test_change_leaf(self):
         old_containers = self.run_up(self.cfg)
@@ -122,7 +122,7 @@ class ProjectWithDependenciesTest(ProjectTestCase):
         self.cfg['nginx']['environment'] = {'NEW_VAR': '1'}
         new_containers = self.run_up(self.cfg)
 
-        assert set(c.name_without_project for c in new_containers - old_containers) == set(['nginx_1'])
+        assert set(c.service for c in new_containers - old_containers) == set(['nginx'])
 
     def test_change_middle(self):
         old_containers = self.run_up(self.cfg)
@@ -130,7 +130,7 @@ class ProjectWithDependenciesTest(ProjectTestCase):
         self.cfg['web']['environment'] = {'NEW_VAR': '1'}
         new_containers = self.run_up(self.cfg)
 
-        assert set(c.name_without_project for c in new_containers - old_containers) == set(['web_1'])
+        assert set(c.service for c in new_containers - old_containers) == set(['web'])
 
     def test_change_middle_always_recreate_deps(self):
         old_containers = self.run_up(self.cfg, always_recreate_deps=True)
@@ -138,8 +138,7 @@ class ProjectWithDependenciesTest(ProjectTestCase):
         self.cfg['web']['environment'] = {'NEW_VAR': '1'}
         new_containers = self.run_up(self.cfg, always_recreate_deps=True)
 
-        assert set(c.name_without_project
+        assert set(c.service for c in new_containers - old_containers) == {'web', 'nginx'}
-                   for c in new_containers - old_containers) == {'web_1', 'nginx_1'}
 
     def test_change_root(self):
         old_containers = self.run_up(self.cfg)
@@ -147,7 +146,7 @@ class ProjectWithDependenciesTest(ProjectTestCase):
         self.cfg['db']['environment'] = {'NEW_VAR': '1'}
         new_containers = self.run_up(self.cfg)
 
-        assert set(c.name_without_project for c in new_containers - old_containers) == set(['db_1'])
+        assert set(c.service for c in new_containers - old_containers) == set(['db'])
 
     def test_change_root_always_recreate_deps(self):
         old_containers = self.run_up(self.cfg, always_recreate_deps=True)
@@ -155,8 +154,9 @@ class ProjectWithDependenciesTest(ProjectTestCase):
         self.cfg['db']['environment'] = {'NEW_VAR': '1'}
         new_containers = self.run_up(self.cfg, always_recreate_deps=True)
 
-        assert set(c.name_without_project
+        assert set(c.service for c in new_containers - old_containers) == {
-                   for c in new_containers - old_containers) == {'db_1', 'web_1', 'nginx_1'}
+            'db', 'web', 'nginx'
+        }
 
     def test_change_root_no_recreate(self):
         old_containers = self.run_up(self.cfg)
@@ -195,9 +195,18 @@ class ProjectWithDependenciesTest(ProjectTestCase):
 
         web, = [c for c in containers if c.service == 'web']
         nginx, = [c for c in containers if c.service == 'nginx']
+        db, = [c for c in containers if c.service == 'db']
 
-        assert set(get_links(web)) == {'composetest_db_1', 'db', 'db_1'}
+        assert set(get_links(web)) == {
-        assert set(get_links(nginx)) == {'composetest_web_1', 'web', 'web_1'}
+            'composetest_db_{}_{}'.format(db.number, db.slug),
+            'db',
+            'db_{}_{}'.format(db.number, db.slug)
+        }
+        assert set(get_links(nginx)) == {
+            'composetest_web_{}_{}'.format(web.number, web.slug),
+            'web',
+            'web_{}_{}'.format(web.number, web.slug)
+        }
 
 
 class ServiceStateTest(DockerClientTestCase):

tests/unit/container_test.py

@@ -30,7 +30,8 @@ class ContainerTest(unittest.TestCase):
                 "Labels": {
                     "com.docker.compose.project": "composetest",
                     "com.docker.compose.service": "web",
-                    "com.docker.compose.container-number": 7,
+                    "com.docker.compose.container-number": "7",
+                    "com.docker.compose.slug": "092cd63296fdc446ad432d3905dd1fcbe12a2ba6b52"
                 },
             }
         }
@@ -88,7 +89,7 @@ class ContainerTest(unittest.TestCase):
     def test_name_without_project(self):
         self.container_dict['Name'] = "/composetest_web_7"
         container = Container(None, self.container_dict, has_been_inspected=True)
-        assert container.name_without_project == "web_7"
+        assert container.name_without_project == "web_7_092cd63296fd"
 
     def test_name_without_project_custom_container_name(self):
         self.container_dict['Name'] = "/custom_name_of_container"

tests/unit/service_test.py

@@ -173,10 +173,10 @@ class ServiceTest(unittest.TestCase):
     def test_self_reference_external_link(self):
         service = Service(
             name='foo',
-            external_links=['default_foo_1']
+            external_links=['default_foo_1_bdfa3ed91e2c']
         )
         with pytest.raises(DependencyError):
-            service.get_container_name('foo', 1)
+            service.get_container_name('foo', 1, 'bdfa3ed91e2c')
 
     def test_mem_reservation(self):
         self.mock_client.create_host_config.return_value = {}
@@ -317,13 +317,14 @@ class ServiceTest(unittest.TestCase):
         self.mock_client.inspect_image.return_value = {'Id': 'abcd'}
         prev_container = mock.Mock(
             id='ababab',
-            image_config={'ContainerConfig': {}})
+            image_config={'ContainerConfig': {}}
+        )
+        prev_container.full_slug = 'abcdefff1234'
         prev_container.get.return_value = None
 
         opts = service._get_container_create_options(
-            {},
+            {}, 1, previous_container=prev_container
-            1,
+        )
-            previous_container=prev_container)
 
         assert service.options['labels'] == labels
         assert service.options['environment'] == environment
@@ -355,11 +356,13 @@ class ServiceTest(unittest.TestCase):
             }.get(key, None)
 
         prev_container.get.side_effect = container_get
+        prev_container.full_slug = 'abcdefff1234'
 
         opts = service._get_container_create_options(
             {},
             1,
-            previous_container=prev_container)
+            previous_container=prev_container
+        )
 
         assert opts['environment'] == ['affinity:container==ababab']
 
@@ -370,6 +373,7 @@ class ServiceTest(unittest.TestCase):
             id='ababab',
             image_config={'ContainerConfig': {}})
         prev_container.get.return_value = None
+        prev_container.full_slug = 'abcdefff1234'
 
         opts = service._get_container_create_options(
             {},
@@ -386,7 +390,7 @@ class ServiceTest(unittest.TestCase):
 
     @mock.patch('compose.service.Container', autospec=True)
     def test_get_container(self, mock_container_class):
-        container_dict = dict(Name='default_foo_2')
+        container_dict = dict(Name='default_foo_2_bdfa3ed91e2c')
         self.mock_client.containers.return_value = [container_dict]
         service = Service('foo', image='foo', client=self.mock_client)
 
@@ -463,6 +467,7 @@ class ServiceTest(unittest.TestCase):
     @mock.patch('compose.service.Container', autospec=True)
     def test_recreate_container(self, _):
         mock_container = mock.create_autospec(Container)
+        mock_container.full_slug = 'abcdefff1234'
         service = Service('foo', client=self.mock_client, image='someimage')
         service.image = lambda: {'Id': 'abc123'}
         new_container = service.recreate_container(mock_container)
@@ -476,6 +481,7 @@ class ServiceTest(unittest.TestCase):
     @mock.patch('compose.service.Container', autospec=True)
     def test_recreate_container_with_timeout(self, _):
         mock_container = mock.create_autospec(Container)
+        mock_container.full_slug = 'abcdefff1234'
         self.mock_client.inspect_image.return_value = {'Id': 'abc123'}
         service = Service('foo', client=self.mock_client, image='someimage')
         service.recreate_container(mock_container, timeout=1)
@@ -711,9 +717,9 @@ class ServiceTest(unittest.TestCase):
 
         for api_version in set(API_VERSIONS.values()):
             self.mock_client.api_version = api_version
-            assert service._get_container_create_options({}, 1)['labels'][LABEL_CONFIG_HASH] == (
+            assert service._get_container_create_options(
-                config_hash
+                {}, 1
-            )
+            )['labels'][LABEL_CONFIG_HASH] == config_hash
 
     def test_remove_image_none(self):
         web = Service('web', image='example', client=self.mock_client)