在不同的机器上运行 worker 会导致下面指定的错误。我关注了the configuration instructions并同步 dags 文件夹。
我还要确认一下,RabbitMQ和PostgreSQL只需要安装在Airflow核心机上,不需要安装在worker上(worker只连接core)。
设置规范详述如下:
Airflow 核心/服务器计算机
已安装以下内容:
- Python 2.7 与
- Airflow (AIRFLOW_HOME = ~/airflow)
- celery
- 心理治疗师2
- RabbitMQ
- PostgreSQL
airflow.cfg 中的配置:
sql_alchemy_conn = postgresql+psycopg2://username:password@192.168.1.2:5432/airflow
executor = CeleryExecutor
broker_url = amqp://username:password@192.168.1.2:5672//
celery_result_backend = postgresql+psycopg2://username:password@192.168.1.2:5432/airflow
执行的测试:
- RabbitMQ 正在运行
- 可以连接到 PostgreSQL 并已确认 Airflow 已创建表
- 可以启动和查看网络服务器(包括自定义 dags)
.
.
Airflow 工作计算机
已安装以下内容:
- Python 2.7 与
- Airflow (AIRFLOW_HOME = ~/airflow)
- celery
- 心理治疗师2
airflow.cfg 中的配置与服务器中的完全相同:
sql_alchemy_conn = postgresql+psycopg2://username:password@192.168.1.2:5432/airflow
executor = CeleryExecutor
broker_url = amqp://username:password@192.168.1.2:5672//
celery_result_backend = postgresql+psycopg2://username:password@192.168.1.2:5432/airflow
在工作机器上运行的命令的输出:
当运行 airflow flower
时:
ubuntu@airflow_client:~/airflow$ airflow flower
[2016-06-13 04:19:42,814] {__init__.py:36} INFO - Using executor CeleryExecutor
Traceback (most recent call last):
File "/home/ubuntu/anaconda2/bin/airflow", line 15, in <module>
args.func(args)
File "/home/ubuntu/anaconda2/lib/python2.7/site-packages/airflow/bin/cli.py", line 576, in flower
os.execvp("flower", ['flower', '-b', broka, port, api])
File "/home/ubuntu/anaconda2/lib/python2.7/os.py", line 346, in execvp
_execvpe(file, args)
File "/home/ubuntu/anaconda2/lib/python2.7/os.py", line 382, in _execvpe
func(fullname, *argrest)
OSError: [Errno 2] No such file or directory
当运行 airflow worker
时:
ubuntu@airflow_client:~$ airflow worker
[2016-06-13 04:08:43,573] {__init__.py:36} INFO - Using executor CeleryExecutor
[2016-06-13 04:08:43,935: ERROR/MainProcess] Unrecoverable error: ImportError('No module named postgresql',)
Traceback (most recent call last):
File "/home/ubuntu/anaconda2/lib/python2.7/site-packages/celery/worker/__init__.py", line 206, in start
self.blueprint.start(self)
File "/home/ubuntu/anaconda2/lib/python2.7/site-packages/celery/bootsteps.py", line 119, in start
self.on_start()
File "/home/ubuntu/anaconda2/lib/python2.7/site-packages/celery/apps/worker.py", line 169, in on_start
string(self.colored.cyan(' \n', self.startup_info())),
File "/home/ubuntu/anaconda2/lib/python2.7/site-packages/celery/apps/worker.py", line 230, in startup_info
results=self.app.backend.as_uri(),
File "/home/ubuntu/anaconda2/lib/python2.7/site-packages/kombu/utils/__init__.py", line 325, in __get__
value = obj.__dict__[self.__name__] = self.__get(obj)
File "/home/ubuntu/anaconda2/lib/python2.7/site-packages/celery/app/base.py", line 626, in backend
return self._get_backend()
File "/home/ubuntu/anaconda2/lib/python2.7/site-packages/celery/app/base.py", line 444, in _get_backend
self.loader)
File "/home/ubuntu/anaconda2/lib/python2.7/site-packages/celery/backends/__init__.py", line 68, in get_backend_by_url
return get_backend_cls(backend, loader), url
File "/home/ubuntu/anaconda2/lib/python2.7/site-packages/celery/backends/__init__.py", line 49, in get_backend_cls
cls = symbol_by_name(backend, aliases)
File "/home/ubuntu/anaconda2/lib/python2.7/site-packages/kombu/utils/__init__.py", line 96, in symbol_by_name
module = imp(module_name, package=package, **kwargs)
File "/home/ubuntu/anaconda2/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
ImportError: No module named postgresql
当 celery_result_backend
更改为默认的 db+mysql://airflow:airflow@localhost:3306/airflow
和 airflow worker
再次运行结果是:
ubuntu@airflow_client:~/airflow$ airflow worker
[2016-06-13 04:17:32,387] {__init__.py:36} INFO - Using executor CeleryExecutor
-------------- celery@airflow_client2 v3.1.23 (Cipater)
---- **** -----
--- * *** * -- Linux-3.19.0-59-generic-x86_64-with-debian-jessie-sid
-- * - **** ---
- ** ---------- [config]
- ** ---------- .> app: airflow.executors.celery_executor:0x7f5cb65cb510
- ** ---------- .> transport: amqp://username:**@192.168.1.2:5672//
- ** ---------- .> results: mysql://airflow:**@localhost:3306/airflow
- *** --- * --- .> concurrency: 16 (prefork)
-- ******* ----
--- ***** ----- [queues]
-------------- .> default exchange=default(direct) key=celery
[2016-06-13 04:17:33,385] {__init__.py:36} INFO - Using executor CeleryExecutor
Starting flask
[2016-06-13 04:17:33,737] {_internal.py:87} INFO - * Running on http://0.0.0.0:8793/ (Press CTRL+C to quit)
[2016-06-13 04:17:34,536: WARNING/MainProcess] celery@airflow_client2 ready.
我错过了什么?我该如何进一步诊断?
最佳答案
ImportError: No module named postgresql
错误是由于您的 celery_result_backend
中使用了无效的前缀。使用数据库作为 Celery 后端时,连接 URL 必须以 db+
为前缀。看
https://docs.celeryproject.org/en/stable/userguide/configuration.html#conf-database-result-backend
所以替换:
celery_result_backend = postgresql+psycopg2://username:password@192.168.1.2:5432/airflow
用类似的东西:
celery_result_backend = db+postgresql://username:password@192.168.1.2:5432/airflow
关于python - 无法启动 Airflow worker/flower,需要澄清 Airflow 架构以确认安装正确,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37785061/