啟動airflow websever時報錯，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啟動時，會調用subprocess.Popen創建子進程，webserver使用gunicorn，啟動參數：
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()']
執行gunicorn啟動時，因為在PATH中找不到該命令報錯。
創建gunicorn軟連接
ln –fs /home/admin/python3.6/bin/gunicorn/bin/gunicorn /bin/gunicorn
或者將/home/admin/pytthon3.6/bin添加到PATH，export PATH=${PATH}:/home/admin/python3.6/bin