问题描述

使用supervisord启动应用时，supervisord报如下错误无法启动：

Apr 27 13:02:01 lx-redis-2 systemd: Starting Process Monitoring and Control Daemon...
Apr 27 13:02:01 lx-redis-2 supervisord: Traceback (most recent call last):
Apr 27 13:02:01 lx-redis-2 supervisord: File "/usr/bin/supervisord", line 5, in <module>
Apr 27 13:02:01 lx-redis-2 supervisord: from pkg_resources import load_entry_point
Apr 27 13:02:01 lx-redis-2 supervisord: File "/usr/local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3251, in <module>
Apr 27 13:02:01 lx-redis-2 supervisord: def _initialize_master_working_set():
Apr 27 13:02:01 lx-redis-2 supervisord: File "/usr/local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3234, in _call_aside
Apr 27 13:02:01 lx-redis-2 supervisord: f(*args, **kwargs)
Apr 27 13:02:01 lx-redis-2 supervisord: File "/usr/local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3263, in _initialize_master_working_set
Apr 27 13:02:01 lx-redis-2 supervisord: working_set = WorkingSet._build_master()
Apr 27 13:02:01 lx-redis-2 supervisord: File "/usr/local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 583, in _build_master
Apr 27 13:02:01 lx-redis-2 supervisord: ws.require(__requires__)
Apr 27 13:02:01 lx-redis-2 supervisord: File "/usr/local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 900, in require
Apr 27 13:02:01 lx-redis-2 supervisord: needed = self.resolve(parse_requirements(requirements))
Apr 27 13:02:01 lx-redis-2 supervisord: File "/usr/local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 786, in resolve
Apr 27 13:02:01 lx-redis-2 supervisord: raise DistributionNotFound(req, requirers)
Apr 27 13:02:01 lx-redis-2 supervisord: pkg_resources.DistributionNotFound: The 'supervisor==3.4.0' distribution was not found and is required by the application
Apr 27 13:02:01 lx-redis-2 systemd: supervisord.service: control process exited, code=exited status=1
Apr 27 13:02:01 lx-redis-2 systemd: Failed to start Process Monitoring and Control Daemon.
Apr 27 13:02:01 lx-redis-2 systemd: Unit supervisord.service entered failed state.
Apr 27 13:02:01 lx-redis-2 systemd: supervisord.service failed.

原因分析

由于服务器之前升级了默认python版本至3.8.1，而supervisord使用的还是2版本的python，因此启动报错

问题处理

编辑/usr/bin/supervisord文件，将首行python版本改为2，如下

#!/usr/bin/python2