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我在这里基于双叉方法编写了一个 python 守护程序。

它在scsdaemon.py使用 start|stop 参数直接调用时非常有效,并且在 raspberry 已经启动时调用下面的 init 脚本也可以正常工作。

我确保在启动期间通过运行调用脚本,sudo update-rc.d scsdaemon defaults并确保它是可执行的:

$ ls -l /etc/init.d/scsdaemon
-rwxr-xr-x 1 root root 1639 Mar 14 19:25 /etc/init.d/scsdaemon

我已经在 init 脚本中放入了一个重定向到文件的 echo 语句,/tmp因此可以验证脚本是否运行。
但是服务没有启动。日志中没有一条消息,我的应用程序创建的日志也在那里但为空。

我错过了什么?为什么这在正常运行期间有效,但在启动期间无效?

#!/bin/sh

### BEGIN INIT INFO
# Provides:          scsdaemon
# Required-Start:    $remote_fs $syslog $network
# Required-Stop:     $remote_fs $syslog $network
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Put a short description of the service here
# Description:       Put a long description of the service here
### END INIT INFO

# Change the next 3 lines to suit where you install your script and what you want to call it
DIR=/var/www/bin/py
DAEMON=$DIR/scsdaemon.py
DAEMON_NAME=scsdaemon

# Add any command line options for your daemon here
DAEMON_OPTS=""

# This next line determines what user the script runs as.
# Root generally not recommended but necessary if you are using the Raspberry Pi GPIO from Python.
DAEMON_USER=www-data

# The process ID of the script when it runs is stored here:
PIDFILE=/tmp/$DAEMON_NAME.pid

. /lib/lsb/init-functions

do_start () {
    log_daemon_msg "Starting system $DAEMON_NAME daemon"
    start-stop-daemon --start --user $DAEMON_USER --chuid $DAEMON_USER --exec $DAEMON -- start $DAEMON_OPTS
    log_end_msg $?
}
do_stop () {
    log_daemon_msg "Stopping system $DAEMON_NAME daemon"
    start-stop-daemon --start --exec $DAEMON --retry 10 -- stop $DAEMON_OPTS
    log_end_msg $?
}

case "$1" in

    start|stop)
        do_${1}
        ;;

    restart|reload|force-reload)
        do_stop
        do_start
        ;;

    status)
        status_of_proc "$DAEMON_NAME" "$DAEMON" && exit 0 || exit $?
        ;;

    *)
        echo "Usage: /etc/init.d/$DAEMON_NAME {start|stop|restart|status}"
        exit 1
        ;;

esac
exit 0
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