UnightSun opened a new issue #17804:
URL: https://github.com/apache/airflow/issues/17804
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**Apache Airflow version**: 2.1.2
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**OS**: CentOS Linux release 8.2.2004 (Core)
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**Apache Airflow Provider versions**:
apache-airflow-providers-celery==2.0.0
apache-airflow-providers-ftp==2.0.0
apache-airflow-providers-http==2.0.0
apache-airflow-providers-imap==2.0.0
apache-airflow-providers-mysql==2.1.0
apache-airflow-providers-redis==2.0.0
apache-airflow-providers-sftp==2.1.0
apache-airflow-providers-sqlite==2.0.0
apache-airflow-providers-ssh==2.1.0
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**Deployment**: Virtualenv 3.7.5
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**What happened**:
Got error when I try to start a webserver:
```bash
$ $VENV_PATH/bin/airflow webserver
...
=================================================================
Traceback (most recent call last):
File "/VENV_PATH/bin/airflow", line 8, in <module>
sys.exit(main())
File "/VENV_PATH/lib/python3.7/site-packages/airflow/__main__.py", line
40, in main
args.func(args)
File "/VENV_PATH/lib/python3.7/site-packages/airflow/cli/cli_parser.py",
line 48, in command
return func(*args, **kwargs)
File "/VENV_PATH/lib/python3.7/site-packages/airflow/utils/cli.py", line
91, in wrapper
return f(*args, **kwargs)
File
"/VENV_PATH/lib/python3.7/site-packages/airflow/cli/commands/webserver_command.py",
line 483, in webserver
with subprocess.Popen(run_args, close_fds=True) as gunicorn_master_proc:
File "/home/user/.pyenv/versions/3.7.5/lib/python3.7/subprocess.py", line
800, in __init__
restore_signals, start_new_session)
File "/home/user/.pyenv/versions/3.7.5/lib/python3.7/subprocess.py", line
1551, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'gunicorn':
'gunicorn'
[user@xxxxx xxxxxxxxxx]$ /VENV_PATH/bin/python
Python 3.7.5 (default, Aug 20 2021, 17:16:24)
```
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**What you expected to happen**:
Airflow start webserver success
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**How to reproduce it**:
assume we already have `AIRFLOW_HOME`
1. create a venv: `virtualenv xxx`
2. `xxx/bin/pip install apache-airflow`
3. `xxx/bin/airflow webserver`
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**Anything else we need to know**:
`cli/commands/webserver_command.py:394` use `gunicorn` as subprocess
command, assume it's in PATH.
`airflow webserver` runs well after `export PATH=$PATH:$VENV_PATH/bin`.
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**Are you willing to submit a PR?**
I'm not good at python so maybe it's not a good idea for me to submit a PR.
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