[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。
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。
將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
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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