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Error Message

sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) could not translate host name "musicbrainz_db" to address: Name or service not known

Stacktrace

self = Engine(postgresql://musicbrainz:***@musicbrainz_db:5432/musicbrainz_db)
fn = <bound method Pool.connect of <sqlalchemy.pool.NullPool object at 0x7f48e37ff4a8>>
connection = None

    def _wrap_pool_connect(self, fn, connection):
        dialect = self.dialect
        try:
>           return fn()

/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py:2147: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <sqlalchemy.pool.NullPool object at 0x7f48e37ff4a8>

    def connect(self):
        """Return a DBAPI connection from the pool.
    
            The connection is instrumented such that when its
            ``close()`` method is called, the connection will be returned to
            the pool.
    
            """
        if not self._use_threadlocal:
>           return _ConnectionFairy._checkout(self)

/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py:387: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

cls = <class 'sqlalchemy.pool._ConnectionFairy'>
pool = <sqlalchemy.pool.NullPool object at 0x7f48e37ff4a8>, threadconns = None
fairy = None

    @classmethod
    def _checkout(cls, pool, threadconns=None, fairy=None):
        if not fairy:
>           fairy = _ConnectionRecord.checkout(pool)

/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py:766: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

cls = <class 'sqlalchemy.pool._ConnectionRecord'>
pool = <sqlalchemy.pool.NullPool object at 0x7f48e37ff4a8>

    @classmethod
    def checkout(cls, pool):
>       rec = pool._do_get()

/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py:516: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <sqlalchemy.pool.NullPool object at 0x7f48e37ff4a8>

    def _do_get(self):
>       return self._create_connection()

/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py:1229: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <sqlalchemy.pool.NullPool object at 0x7f48e37ff4a8>

    def _create_connection(self):
        """Called by subclasses to create a new ConnectionRecord."""
    
>       return _ConnectionRecord(self)

/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py:333: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <sqlalchemy.pool._ConnectionRecord object at 0x7f48e26669b0>
pool = <sqlalchemy.pool.NullPool object at 0x7f48e37ff4a8>, connect = True

    def __init__(self, pool, connect=True):
        self.__pool = pool
        if connect:
>           self.__connect(first_connect_check=True)

/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py:461: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <sqlalchemy.pool._ConnectionRecord object at 0x7f48e26669b0>
first_connect_check = True

    def __connect(self, first_connect_check=False):
        pool = self.__pool
    
        # ensure any existing connection is removed, so that if
        # creator fails, this attribute stays None
        self.connection = None
        try:
            self.starttime = time.time()
>           connection = pool._invoke_creator(self)

/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py:651: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

connection_record = <sqlalchemy.pool._ConnectionRecord object at 0x7f48e26669b0>

    def connect(connection_record=None):
        if dialect._has_events:
            for fn in dialect.dispatch.do_connect:
                connection = fn(
                    dialect, connection_record, cargs, cparams)
                if connection is not None:
                    return connection
>       return dialect.connect(*cargs, **cparams)

/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/strategies.py:105: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <sqlalchemy.dialects.postgresql.psycopg2.PGDialect_psycopg2 object at 0x7f48e37ff550>
cargs = ()
cparams = {'database': 'musicbrainz_db', 'host': 'musicbrainz_db', 'password': 'musicbrainz', 'port': 5432, ...}

    def connect(self, *cargs, **cparams):
>       return self.dbapi.connect(*cargs, **cparams)

/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/default.py:393: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dsn = 'dbname=musicbrainz_db user=musicbrainz password=musicbrainz host=musicbrainz_db port=5432'
database = 'musicbrainz_db', user = 'musicbrainz', password = 'musicbrainz'
host = 'musicbrainz_db', port = 5432, connection_factory = None
cursor_factory = None, async = False, kwargs = {}
items = [('dbname', 'musicbrainz_db'), ('user', 'musicbrainz'), ('password', 'musicbrainz'), ('host', 'musicbrainz_db'), ('port', 5432)]

    def connect(dsn=None,
            database=None, user=None, password=None, host=None, port=None,
            connection_factory=None, cursor_factory=None, async=False, **kwargs):
        """
        Create a new database connection.
    
        The connection parameters can be specified either as a string:
    
            conn = psycopg2.connect("dbname=test user=postgres password=secret")
    
        or using a set of keyword arguments:
    
            conn = psycopg2.connect(database="test", user="postgres", password="secret")
    
        The basic connection parameters are:
    
        - *dbname*: the database name (only in dsn string)
        - *database*: the database name (only as keyword argument)
        - *user*: user name used to authenticate
        - *password*: password used to authenticate
        - *host*: database host address (defaults to UNIX socket if not provided)
        - *port*: connection port number (defaults to 5432 if not provided)
    
        Using the *connection_factory* parameter a different class or connections
        factory can be specified. It should be a callable object taking a dsn
        argument.
    
        Using the *cursor_factory* parameter, a new default cursor factory will be
        used by cursor().
    
        Using *async*=True an asynchronous connection will be created.
    
        Any other keyword parameter will be passed to the underlying client
        library: the list of supported parameters depends on the library version.
    
        """
        items = []
        if database is not None:
            items.append(('dbname', database))
        if user is not None:
            items.append(('user', user))
        if password is not None:
            items.append(('password', password))
        if host is not None:
            items.append(('host', host))
        if port is not None:
            items.append(('port', port))
    
        items.extend([(k, v) for (k, v) in kwargs.items() if v is not None])
    
        if dsn is not None and items:
            raise TypeError(
                "'%s' is an invalid keyword argument when the dsn is specified"
                    % items[0][0])
    
        if dsn is None:
            if not items:
                raise TypeError('missing dsn and no parameters')
            else:
                dsn = " ".join(["%s=%s" % (k, _param_escape(str(v)))
                    for (k, v) in items])
    
>       conn = _connect(dsn, connection_factory=connection_factory, async=async)
E       psycopg2.OperationalError: could not translate host name "musicbrainz_db" to address: Name or service not known

/usr/local/lib/python3.6/site-packages/psycopg2/__init__.py:164: OperationalError

The above exception was the direct cause of the following exception:

self = <critiquebrainz.frontend.views.test.test_release_group.ReleaseGroupViewsTestCase testMethod=test_release_group_page>

    def test_release_group_page(self):
        # Basic release group page should be available.
>       response = self.client.get("/release-group/c2e0ff67-fb31-4443-ae0e-22ecf010463b")

critiquebrainz/frontend/views/test/test_release_group.py:8: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/usr/local/lib/python3.6/site-packages/werkzeug/test.py:791: in get
    return self.open(*args, **kw)
/usr/local/lib/python3.6/site-packages/flask/testing.py:127: in open
    follow_redirects=follow_redirects)
/usr/local/lib/python3.6/site-packages/werkzeug/test.py:764: in open
    response = self.run_wsgi_app(environ, buffered=buffered)
/usr/local/lib/python3.6/site-packages/werkzeug/test.py:677: in run_wsgi_app
    rv = run_wsgi_app(self.application, environ, buffered=buffered)
/usr/local/lib/python3.6/site-packages/werkzeug/test.py:884: in run_wsgi_app
    app_rv = app(environ, start_response)
/usr/local/lib/python3.6/site-packages/flask/app.py:1997: in __call__
    return self.wsgi_app(environ, start_response)
/usr/local/lib/python3.6/site-packages/flask/app.py:1985: in wsgi_app
    response = self.handle_exception(e)
/usr/local/lib/python3.6/site-packages/flask/app.py:1540: in handle_exception
    reraise(exc_type, exc_value, tb)
/usr/local/lib/python3.6/site-packages/flask/_compat.py:33: in reraise
    raise value
/usr/local/lib/python3.6/site-packages/flask/app.py:1982: in wsgi_app
    response = self.full_dispatch_request()
/usr/local/lib/python3.6/site-packages/flask/app.py:1614: in full_dispatch_request
    rv = self.handle_user_exception(e)
/usr/local/lib/python3.6/site-packages/flask/app.py:1517: in handle_user_exception
    reraise(exc_type, exc_value, tb)
/usr/local/lib/python3.6/site-packages/flask/_compat.py:33: in reraise
    raise value
/usr/local/lib/python3.6/site-packages/flask/app.py:1612: in full_dispatch_request
    rv = self.dispatch_request()
/usr/local/lib/python3.6/site-packages/flask/app.py:1598: in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
critiquebrainz/frontend/views/release_group.py:18: in entity
    release_group = mb_release_group.get_release_group_by_id(id)
critiquebrainz/frontend/external/musicbrainz_db/release_group.py:22: in get_release_group_by_id
    includes=['artists', 'releases', 'release-group-rels', 'url-rels', 'work-rels', 'tags']
critiquebrainz/frontend/external/musicbrainz_db/release_group.py:35: in fetch_multiple_release_groups
    release_group = get_something_by_gid(query, models.ReleaseGroupGIDRedirect, mbid)
/usr/local/lib/python3.6/site-packages/mbdata/utils/__init__.py:55: in get_something_by_gid
    artist = query.filter_by(gid=gid).first()
/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/query.py:2755: in first
    ret = list(self[0:1])
/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/query.py:2547: in __getitem__
    return list(res)
/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/query.py:2855: in __iter__
    return self._execute_and_instances(context)
/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/query.py:2876: in _execute_and_instances
    close_with_result=True)
/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/query.py:2885: in _get_bind_args
    **kw
/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/query.py:2867: in _connection_from_session
    conn = self.session.connection(**kw)
/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py:998: in connection
    execution_options=execution_options)
/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py:1003: in _connection_for_bind
    engine, execution_options)
/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py:403: in _connection_for_bind
    conn = bind.contextual_connect()
/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py:2112: in contextual_connect
    self._wrap_pool_connect(self.pool.connect, None),
/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py:2151: in _wrap_pool_connect
    e, dialect, self)
/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py:1465: in _handle_dbapi_exception_noconnection
    exc_info
/usr/local/lib/python3.6/site-packages/sqlalchemy/util/compat.py:203: in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb, cause=cause)
/usr/local/lib/python3.6/site-packages/sqlalchemy/util/compat.py:186: in reraise
    raise value.with_traceback(tb)
/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py:2147: in _wrap_pool_connect
    return fn()
/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py:387: in connect
    return _ConnectionFairy._checkout(self)
/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py:766: in _checkout
    fairy = _ConnectionRecord.checkout(pool)
/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py:516: in checkout
    rec = pool._do_get()
/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py:1229: in _do_get
    return self._create_connection()
/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py:333: in _create_connection
    return _ConnectionRecord(self)
/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py:461: in __init__
    self.__connect(first_connect_check=True)
/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py:651: in __connect
    connection = pool._invoke_creator(self)
/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/strategies.py:105: in connect
    return dialect.connect(*cargs, **cparams)
/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/default.py:393: in connect
    return self.dbapi.connect(*cargs, **cparams)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dsn = 'dbname=musicbrainz_db user=musicbrainz password=musicbrainz host=musicbrainz_db port=5432'
database = 'musicbrainz_db', user = 'musicbrainz', password = 'musicbrainz'
host = 'musicbrainz_db', port = 5432, connection_factory = None
cursor_factory = None, async = False, kwargs = {}
items = [('dbname', 'musicbrainz_db'), ('user', 'musicbrainz'), ('password', 'musicbrainz'), ('host', 'musicbrainz_db'), ('port', 5432)]

    def connect(dsn=None,
            database=None, user=None, password=None, host=None, port=None,
            connection_factory=None, cursor_factory=None, async=False, **kwargs):
        """
        Create a new database connection.
    
        The connection parameters can be specified either as a string:
    
            conn = psycopg2.connect("dbname=test user=postgres password=secret")
    
        or using a set of keyword arguments:
    
            conn = psycopg2.connect(database="test", user="postgres", password="secret")
    
        The basic connection parameters are:
    
        - *dbname*: the database name (only in dsn string)
        - *database*: the database name (only as keyword argument)
        - *user*: user name used to authenticate
        - *password*: password used to authenticate
        - *host*: database host address (defaults to UNIX socket if not provided)
        - *port*: connection port number (defaults to 5432 if not provided)
    
        Using the *connection_factory* parameter a different class or connections
        factory can be specified. It should be a callable object taking a dsn
        argument.
    
        Using the *cursor_factory* parameter, a new default cursor factory will be
        used by cursor().
    
        Using *async*=True an asynchronous connection will be created.
    
        Any other keyword parameter will be passed to the underlying client
        library: the list of supported parameters depends on the library version.
    
        """
        items = []
        if database is not None:
            items.append(('dbname', database))
        if user is not None:
            items.append(('user', user))
        if password is not None:
            items.append(('password', password))
        if host is not None:
            items.append(('host', host))
        if port is not None:
            items.append(('port', port))
    
        items.extend([(k, v) for (k, v) in kwargs.items() if v is not None])
    
        if dsn is not None and items:
            raise TypeError(
                "'%s' is an invalid keyword argument when the dsn is specified"
                    % items[0][0])
    
        if dsn is None:
            if not items:
                raise TypeError('missing dsn and no parameters')
            else:
                dsn = " ".join(["%s=%s" % (k, _param_escape(str(v)))
                    for (k, v) in items])
    
>       conn = _connect(dsn, connection_factory=connection_factory, async=async)
E       sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) could not translate host name "musicbrainz_db" to address: Name or service not known

/usr/local/lib/python3.6/site-packages/psycopg2/__init__.py:164: OperationalError