how to prevent zombie processes in a custom runtime-Function Compute(FC)-阿里云帮助中心

Cause

Zombie processes can occur because of issues in your code.

When you create a Web Function and configure a Startup Command, Function Compute assigns your start command as process ID (PID) 1. By default, most application processes running as PID 1 do not reap child processes — meaning child processes that exit remain in the process table as zombie processes until PID 1 collects their exit status. To prevent this, configure a start command that can reap zombie processes.

Option 1: Wrap your application in a Bash script (recommended)

Bash, when running as PID 1, automatically reaps zombie child processes. Set the Startup Command to a Bash wrapper script instead of running your application directly.

Steps

Create /code/start.sh with the following content:
```
#! /bin/bash
python /code/app.py
```
Set the Startup Command to /code/start.sh.

Option 2: Use a bootstrap file (Serverless Devs and API deployments)

If you deploy using Serverless Devs or the API, omit the Startup Command entirely and name your start script bootstrap. When no Startup Command is configured, Function Compute automatically runs /code/bootstrap to start the function.

Like Option 1, wrap your application in Bash to ensure PID 1 reaping:

#! /bin/bash
python /code/app.py

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