Linux进程依赖：如何管理进程间的依赖关系

<code>[Unit]
Description=My Service
After=network.target

[Service]
ExecStart=/usr/bin/my_service

[Install]
WantedBy=multi-user.target</code>

<code>[Unit]
Description=My Service
Requires=another_service.service
Wants=optional_service.service

[Service]
ExecStart=/usr/bin/my_service

[Install]
WantedBy=multi-user.target</code>

<code>#!/bin/bash

### BEGIN INIT INFO
# Provides:          my_service
# Required-Start:    $network $remote_fs $syslog
# Required-Stop:
# Default-Start:     2 3 4 5
# Default-Stop:
# Short-Description: Start my service at boot time
### END INIT INFO

case "$1" in
    start)
        echo "Starting my service..."
        /usr/bin/my_service &
        ;;
    stop)
        echo "Stopping my service..."
        killall my_service
        ;;
    *)
        echo "Usage: /etc/init.d/my_service {start|stop}"
        exit 1
        ;;
esac

exit 0</code>

<code>[program:my_service]
command=/usr/bin/my_service
autostart=true
autorestart=true
stderr_logfile=/var/log/my_service.err.log
stdout_logfile=/var/log/my_service.out.log

[program:another_service]
command=/usr/bin/another_service
autostart=true
autorestart=true
stderr_logfile=/var/log/another_service.err.log
stdout_logfile=/var/log/another_service.out.log

[group:my_group]
programs:my_service,another_service</code>

<code>version: '3'
services:
  web:
    image: my_web_app
    depends_on:
      - db
  db:
    image: postgres</code>