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docker-compose未知MySQL服務器主機'mysql'(氣流)

[英]docker-compose Unknown MySQL server host 'mysql' (airflow)

我嘗試創建我的Airflow服務。 當我分別運行三個碼頭docker-compose (沒有docker-compose )時,一切正常,但是當我嘗試使用docker-compose做同樣的事情時,我得到了錯誤。 似乎氣流沒有看到數據庫。

docker-compose.yml

version: '2'

services:

  mysql:
    image: "someregisty/mysql"
    environment:
     - MYSQL_ROOT_PASSWORD=somepassword

  redis:
    image: "someregisty/redis"

  airflow:
    image: "someregisty/airflow"
    volumes:
     - ./dags:/home/airflow/dags
     - ./logs:/home/airflow/logs
     - ./config/airflow.cfg:/home/airflow/airflow.cfg 
     - ./config/resolv.conf:/etc/resolv.conf
     - ./config/somekeytab.keytab:/home/airflow/airflow.keytab 
    ports:
     - "8484:8080"
    environment:
     - AIRFLOW__CELERY__BROKER_URL=redis://redis:6379/0
     - AIRFLOW__CELERY__CELERY_RESULT_BACKEND=db+mysql://root:somepassword@mysql/airflow
     - AIRFLOW__CORE__SQL_ALCHEMY_CONN=mysql://root:somepassword@mysql/airflow
     - AIRFLOW__CORE__AIRFLOW_HOME=/home/airflow
     - AIRFLOW__CORE__DAGS_FOLDER=/home/airflow/dags/
     - AIRFLOW__CORE__PLUGINS_FOLDER=/home/airflow/plugins/
     - AIRFLOW_SCHEDULER=true
     - AIRFLOW_WEBSERVER=true
     - AIRFLOW_WORKER=true
     - AIRFLOW_KERBEROS=true
     - AIRFLOW_KERBEROS_PRINCIPAL=prj_bdc@DCWP.PL
     - AIRFLOW__KERBEROS__CCACHE=/home/airflow/kerberos.keytab.cache
     - KRB5CCNAME=/home/airflow/kerberos.keytab.cache
    depends_on:
     - redis
     - mysql

我跑

docker-compose up -d
docker-compose exec mysql mysql -u root --password=somepassword -e "create database airflow"

這沒關系。 然后我跑了

docker-compose exec airflow airflow initdb

我明白了

[2017-09-28 16:34:36,100] {__init__.py:57} INFO - Using executor CeleryExecutor
/usr/lib/python2.7/site-packages/airflow/utils/helpers.py:406: DeprecationWarning: Importing BaseSensorOperator directly from <module 'airflow.operators' from '/usr/lib/python2.7/site-packages/airflow/operators/__init__.pyc'> has been deprecated. Please import from '<module 'airflow.operators' from '/usr/lib/python2.7/site-packages/airflow/operators/__init__.pyc'>.[operator_module]' instead. Support for direct imports will be dropped entirely in Airflow 2.0.
  DeprecationWarning)
DB: mysql://root:***@mysql/airflow
[2017-09-28 16:34:36,666] {db.py:287} INFO - Creating tables
Traceback (most recent call last):
  File "/usr/bin/airflow", line 28, in <module>
    args.func(args)
  File "/usr/lib/python2.7/site-packages/airflow/bin/cli.py", line 951, in initdb
    db_utils.initdb()
  File "/usr/lib/python2.7/site-packages/airflow/utils/db.py", line 106, in initdb
    upgradedb()
  File "/usr/lib/python2.7/site-packages/airflow/utils/db.py", line 294, in upgradedb
    command.upgrade(config, 'heads')
  File "/usr/lib/python2.7/site-packages/alembic/command.py", line 174, in upgrade
    script.run_env()
  File "/usr/lib/python2.7/site-packages/alembic/script/base.py", line 416, in run_env
    util.load_python_file(self.dir, 'env.py')
  File "/usr/lib/python2.7/site-packages/alembic/util/pyfiles.py", line 93, in load_python_file
    module = load_module_py(module_id, path)
  File "/usr/lib/python2.7/site-packages/alembic/util/compat.py", line 79, in load_module_py
    mod = imp.load_source(module_id, path, fp)
  File "/usr/lib/python2.7/site-packages/airflow/migrations/env.py", line 86, in <module>
    run_migrations_online()
  File "/usr/lib/python2.7/site-packages/airflow/migrations/env.py", line 73, in run_migrations_online
    with connectable.connect() as connection:
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2091, in connect
    return self._connection_cls(self, **kwargs)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 90, in __init__
    if connection is not None else engine.raw_connection()
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2177, in raw_connection
    self.pool.unique_connection, _connection)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2151, in _wrap_pool_connect
    e, dialect, self)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 1465, in _handle_dbapi_exception_noconnection
    exc_info
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb, cause=cause)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2147, in _wrap_pool_connect
    return fn()
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 328, in unique_connection
    return _ConnectionFairy._checkout(self)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 766, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 516, in checkout
    rec = pool._do_get()
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 1138, in _do_get
    self._dec_overflow()
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 1135, in _do_get
    return self._create_connection()
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 333, in _create_connection
    return _ConnectionRecord(self)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 461, in __init__
    self.__connect(first_connect_check=True)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 651, in __connect
    connection = pool._invoke_creator(self)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/strategies.py", line 105, in connect
    return dialect.connect(*cargs, **cparams)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/default.py", line 393, in connect
    return self.dbapi.connect(*cargs, **cparams)
  File "/usr/lib64/python2.7/site-packages/MySQLdb/__init__.py", line 86, in Connect
    return Connection(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/MySQLdb/connections.py", line 204, in __init__
    super(Connection, self).__init__(*args, **kwargs2)
sqlalchemy.exc.OperationalError: (_mysql_exceptions.OperationalError) (2005, "Unknown MySQL server host 'mysql' (0)")

我不知道出了什么問題。 也許你可以幫助我? :)

docker和docker-compose的版本是

Docker version 1.12.6, build 96d83a5/1.12.6
docker-compose version 1.9.0, build 2585387

該問題是由resolv.conf文件綁定到氣流容器引起的。 你從氣流容器中得到unknown MySQL server host 'mysql'錯誤的原因是mysql主機名沒有解析到氣流容器的ip。

解決方案1

從Compose配置中刪除./config/resolv.conf:/etc/resolv.conf 它將導致Docker正確解析主機名。 如果需要指定其他DNS服務器,請使用此處記錄的 Compose --dns選項。

解決方案2(不推薦)

nameserver 127.0.0.11行添加到/etc/resolv.conf文件中 它支持使用Docker嵌入式DNS服務器,這是一種默認設置。 您也可以將自定義條目保留在該文件中。 請注意,此解決方案是一種黑客攻擊,因為如文檔中所述,Docker負責管理/etc/resolv.conf文件。 從文檔引用備份:

因此,您不應該假設/ etc / hosts,/ etc / resolv.conf等文件在容器內部進行管理並保留文件,並使用以下Docker選項代替

更多

您可以在此處閱讀有關用戶定義網絡中的Docker嵌入式DNS服務器的更多信息。

所以這個錯誤有點誤導。 連接失敗是因為DB不存在,而不是mysql主機不在那里。

將您的mysql服務更改為以下

mysql:
  image: "someregisty/mysql"
  environment:
   - MYSQL_ROOT_PASSWORD=somepassword
   - MYSQL_DATABASE=airflow

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