python - 将 mlflow 作为 systemd 服务运行 - 找不到gunicorn

Question

我正在尝试在 Ubuntu 20.04 上运行作为 systemd 服务安装在 virtualenv 内部的 mlflow 跟踪服务器，但收到一条错误消息，表明它无法找到 Gunicorn。这是我的日记

nov 27 10:37:17 Atrium-Power mlflow[81375]: Traceback (most recent call last):
nov 27 10:37:17 Atrium-Power mlflow[81375]:   File "/home/praxasense/.miniconda3/envs/mlflow-server/bin/mlflow", line 8, in <module>
nov 27 10:37:17 Atrium-Power mlflow[81375]:     sys.exit(cli())
nov 27 10:37:17 Atrium-Power mlflow[81375]:   File "/home/praxasense/.miniconda3/envs/mlflow-server/lib/python3.9/site-packages/click/core.py", line 829, in __call__
nov 27 10:37:17 Atrium-Power mlflow[81375]:     return self.main(*args, **kwargs)
nov 27 10:37:17 Atrium-Power mlflow[81375]:   File "/home/praxasense/.miniconda3/envs/mlflow-server/lib/python3.9/site-packages/click/core.py", line 782, in main
nov 27 10:37:17 Atrium-Power mlflow[81375]:     rv = self.invoke(ctx)
nov 27 10:37:17 Atrium-Power mlflow[81375]:   File "/home/praxasense/.miniconda3/envs/mlflow-server/lib/python3.9/site-packages/click/core.py", line 1259, in invoke
nov 27 10:37:17 Atrium-Power mlflow[81375]:     return _process_result(sub_ctx.command.invoke(sub_ctx))
nov 27 10:37:17 Atrium-Power mlflow[81375]:   File "/home/praxasense/.miniconda3/envs/mlflow-server/lib/python3.9/site-packages/click/core.py", line 1066, in invoke
nov 27 10:37:17 Atrium-Power mlflow[81375]:     return ctx.invoke(self.callback, **ctx.params)
nov 27 10:37:17 Atrium-Power mlflow[81375]:   File "/home/praxasense/.miniconda3/envs/mlflow-server/lib/python3.9/site-packages/click/core.py", line 610, in invoke
nov 27 10:37:17 Atrium-Power mlflow[81375]:     return callback(*args, **kwargs)
nov 27 10:37:17 Atrium-Power mlflow[81375]:   File "/home/praxasense/.miniconda3/envs/mlflow-server/lib/python3.9/site-packages/mlflow/cli.py", line 392, in server
nov 27 10:37:17 Atrium-Power mlflow[81375]:     _run_server(
nov 27 10:37:17 Atrium-Power mlflow[81375]:   File "/home/praxasense/.miniconda3/envs/mlflow-server/lib/python3.9/site-packages/mlflow/server/__init__.py", line 138, in _run_server
nov 27 10:37:17 Atrium-Power mlflow[81375]:     exec_cmd(full_command, env=env_map, stream_output=True)
nov 27 10:37:17 Atrium-Power mlflow[81375]:   File "/home/praxasense/.miniconda3/envs/mlflow-server/lib/python3.9/site-packages/mlflow/utils/process.py", line 34, in exec_cmd
nov 27 10:37:17 Atrium-Power mlflow[81375]:     child = subprocess.Popen(
nov 27 10:37:17 Atrium-Power mlflow[81375]:   File "/home/praxasense/.miniconda3/envs/mlflow-server/lib/python3.9/subprocess.py", line 947, in __init__
nov 27 10:37:17 Atrium-Power mlflow[81375]:     self._execute_child(args, executable, preexec_fn, close_fds,
nov 27 10:37:17 Atrium-Power mlflow[81375]:   File "/home/praxasense/.miniconda3/envs/mlflow-server/lib/python3.9/subprocess.py", line 1819, in _execute_child
nov 27 10:37:17 Atrium-Power mlflow[81375]:     raise child_exception_type(errno_num, err_msg, err_filename)
nov 27 10:37:17 Atrium-Power mlflow[81375]: FileNotFoundError: [Errno 2] No such file or directory: 'gunicorn'

我的系统是这样的:

[Unit]
StartLimitBurst=5
StartLimitIntervalSec=33

[Service]
User=praxasense
WorkingDirectory=/home/praxasense
Restart=always
RestartSec=5
ExecStart=/home/praxasense/.miniconda3/envs/mlflow-server/bin/mlflow server --port 3569 --backend-store-uri .mlruns

[Install]
WantedBy=multi-user.target

奇怪的是，如果我在终端中从 ExecStart 运行命令，它在 Fish shell 中运行良好，但在 bash 中则不行，但是如果我这样做 conda 激活 mlflow-server 然后执行 mlflow ... 它确实工作。据我了解，Python 解释器应该知道它的虚拟环境，因此它应该像我尝试的那样工作，但显然我错过了一些东西，导致它无法找到显然在那里的gunicon包。

有什么想法吗？

Answer 1

尝试将 venv 的 bin 路径添加到 systemd 运行的环境中:

[Service]
...
Environment="PATH=/home/praxasense/.miniconda3/envs/mlflow-server/bin"
...

我还建议设置 KillMode=mixed，因为 MLFlow 将生成 Gunicorn 实例，如果您以其他方式终止服务，这些实例也不会终止。 mixed 表示子进程也将被终止。