在一个依赖于mysql容器的python容器中运行alembic
我有一个项目，我使用以下docker-compose.yml文件：
version: '3' services: python: restart: always build: ./budget/dockerfiles/python/ ports: - "5000:5000" links: - db depends_on: - db volumes: - ./budget/:/app:z entrypoint: - python - -u - /app/run.py db: build: ./budget/dockerfiles/mysql/ environment: MYSQL_ROOT_PASSWORD: rainmakers MYSQL_DATABASE: forecast MYSQL_USER: rain MYSQL_PASSWORD: rainmakers volumes: - ./Dump.sql:/db/Dump.sql:z - ./Dump_Test.sql:/db/Dump_Test.sql:z - ./big_fc.sql:/db/big_fc.sql:z ports: - "3306:3306"
我也有以下alembi.ini文件：
# A generic, single database configuration. [alembic] sqlalchemy.url = mysql://username:password@localhost/database_name # Logging configuration [loggers] keys = root,sqlalchemy,alembic [handlers] keys = console [formatters] keys = generic [logger_root] level = WARN handlers = console qualname = [logger_sqlalchemy] level = WARN handlers = qualname = sqlalchemy.engine [logger_alembic] level = INFO handlers = qualname = alembic [handler_console] class = StreamHandler args = (sys.stderr,) level = NOTSET formatter = generic [formatter_generic] format = %(levelname)-5.5s [%(name)s] %(message)s datefmt = %H:%M:%S
我需要在我的Python容器中运行命令alembic upgrade head ，但是当我运行它时出现以下错误：
Traceback (most recent call last): File "/usr/local/bin/alembic", line 11, in <module> sys.exit(main()) File "/usr/local/lib/python2.7/dist-packages/alembic/config.py", line 479, in main CommandLine(prog=prog).main(argv=argv) File "/usr/local/lib/python2.7/dist-packages/alembic/config.py", line 473, in main self.run_cmd(cfg, options) File "/usr/local/lib/python2.7/dist-packages/alembic/config.py", line 456, in run_cmd **dict((k, getattr(options, k, None)) for k in kwarg) File "/usr/local/lib/python2.7/dist-packages/alembic/command.py", line 254, in upgrade script.run_env() File "/usr/local/lib/python2.7/dist-packages/alembic/script/base.py", line 421, in run_env util.load_python_file(self.dir, 'env.py') File "/usr/local/lib/python2.7/dist-packages/alembic/util/pyfiles.py", line 93, in load_python_file module = load_module_py(module_id, path) File "/usr/local/lib/python2.7/dist-packages/alembic/util/compat.py", line 75, in load_module_py mod = imp.load_source(module_id, path, fp) File "alembic/env.py", line 70, in <module> run_migrations_online() File "alembic/env.py", line 58, in run_migrations_online with connectable.connect() as connection: File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 2085, in connect return self._connection_cls(self, **kwargs) File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 90, in __init__ if connection is not None else engine.raw_connection() File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 2171, in raw_connection self.pool.unique_connection, _connection) File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 2145, in _wrap_pool_connect e, dialect, self) File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1456, in _handle_dbapi_exception_noconnection exc_info File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/compat.py", line 202, in raise_from_cause reraise(type(exception), exception, tb=exc_tb, cause=cause) File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 2141, in _wrap_pool_connect return fn() File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 328, in unique_connection return _ConnectionFairy._checkout(self) File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 766, in _checkout fairy = _ConnectionRecord.checkout(pool) File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 516, in checkout rec = pool._do_get() File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 1229, in _do_get return self._create_connection() File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 333, in _create_connection return _ConnectionRecord(self) File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 461, in __init__ self.__connect(first_connect_check=True) File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 651, in __connect connection = pool._invoke_creator(self) File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/strategies.py", line 105, in connect return dialect.connect(*cargs, **cparams) File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 385, in connect return self.dbapi.connect(*cargs, **cparams) File "/usr/local/lib/python2.7/dist-packages/MySQLdb/__init__.py", line 81, in Connect return Connection(*args, **kwargs) File "/usr/local/lib/python2.7/dist-packages/MySQLdb/connections.py", line 193, in __init__ super(Connection, self).__init__(*args, **kwargs2) sqlalchemy.exc.OperationalError: (_mysql_exceptions.OperationalError) (2002, "Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)")
我想这个错误是这个命令试图find我的Python容器内的MySQL，但这不是在这里，所以我不知道我能做些什么来使它正常运行。
从python容器的angular度来看，mysql IP被parsing为mysql服务的名称： db 。 解决这个问题：
[alembic] sqlalchemy.url = mysql://username:password@db/database_name