Frequently Asked Questions

• Q
• My program never starts and supervisor doesn’t indicate any error?
• A
• Make sure the x bit is set on the executable file you’re using inthe command= line of your program section.
• Q
• I am a software author and I want my program to behave differentlywhen it’s running under supervisord. How can I tell ifmy program is running under supervisord?
• A
• Supervisor and its subprocesses share an environment variableSUPERVISOR_ENABLED. When your program is run undersupervisord, it can check for the presence of thisenvironment variable to determine whether it is running as asupervisord subprocess.
• Q
• My command works fine when I invoke it by hand from a shell prompt,but when I use the same command line in a supervisor programcommand= section, the program fails mysteriously. Why?
• A
• This may be due to your process’ dependence on environment variablesettings. See Subprocess Environment.
• Q
• How can I make Supervisor restart a process that’s using “too much”memory automatically?
• A
• The superlance package contains a console script that can beused as a Supervisor event listener named memmon which helpswith this task. It works on Linux and Mac OS X.