启动airflow websever时报错，FileNotFoundError: [Errno 2] No such file or directory: \'gunicorn\' ，找不到gunicorn。
1: $airflow webserver
2: [2017-06-30 19:06:15,381] {__init__.py:57} INFO - Using executor SequentialExecutor
3: ____________ _____________
4: ____ |__( )_________ __/__ /________ __
5: ____ /| |_ /__ ___/_ /_ __ /_ __ \_ | /| / /
6: ___ ___ | / _ / _ __/ _ / / /_/ /_ |/ |/ /
7: _/_/ |_/_/ /_/ /_/ /_/ \____/____/|__/
8:
9: /home/admin/python3.6/lib/python3.6/site-packages/flask/exthook.py:71: ExtDeprecationWarning: Importing flask.ext.cache is deprecated, use flask_cache instead.
10: .format(x=modname), ExtDeprecationWarning
11: [2017-06-30 19:06:16,351] [24041] {models.py:167} INFO - Filling up the DagBag from /home/admin/airflow/dags
12: Running the Gunicorn Server with:
13: Workers: 4 sync
14: Host: 0.0.0.0:8080
15: Timeout: 120
16: Logfiles: - -
17: =================================================================
18: ----------------------------------------------------------------------------------------------------
19: [\'gunicorn\', \'-w\', \'4\', \'-k\', \'sync\', \'-t\', \'120\', \'-b\', \'0.0.0.0:8080\', \'-n\', \'airflow-webserver\', \'-p\', \'/home/admin/airflow/airflow-webserver.pid\', \'-c\', \'airflow.www.gunicorn_config\', \'--access-logfile\', \'-\', \'--error-logfile\', \'-\', \'airflow.www.app:cached_app()\']
20: ----------------------------------------------------------------------------------------------------
21: Traceback (most recent call last):
22: File "/bin/airflow", line 28, in <module>
23: args.func(args)
24: File "/home/admin/python3.6/lib/python3.6/site-packages/airflow/bin/cli.py", line 794, in webserver
25: gunicorn_master_proc = subprocess.Popen(run_args)
26: File "/home/admin/python3.6/lib/python3.6/subprocess.py", line 707, in __init__
27: restore_signals, start_new_session)
28: File "/home/admin/python3.6/lib/python3.6/subprocess.py", line 1326, in _execute_child
29: raise child_exception_type(errno_num, err_msg)
30: FileNotFoundError: [Errno 2] No such file or directory: \'gunicorn\'
31:
airflow webserver启动时，会调用subprocess.Popen创建子进程，webserver使用gunicorn，启动参数：
1: [\'gunicorn\', \'-w\', \'4\', \'-k\', \'sync\', \'-t\', \'120\', \'-b\', \'0.0.0.0:8080\', \'-n\', \'airflow-webserver\', \'-p\', \'/home/admin/airflow/airflow-webserver.pid\', \'-c\', \'airflow.www.gunicorn_config\', \'--access-logfile\', \'-\', \'--error-logfile\', \'-\', \'airflow.www.app:cached_app()\']
执行gunicorn启动时，因为在PATH中找不到该命令报错。
创建gunicorn软连接
ln –fs /home/admin/python3.6/bin/gunicorn/bin/gunicorn /bin/gunicorn
或者将/home/admin/pytthon3.6/bin添加到PATH，export PATH=${PATH}:/home/admin/python3.6/bin