debian9.6添加开机执行自己的脚本

方法很简单，在/etc/下建一个rc.local文件就行，以下就是理由。

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1，前言

        玩过早一点的linux的人会发现在/etc或者在/etc/rc.d目录下有一个rc.local文件，现在没了。某种程度上应该算有的，事情的原因起因于一个叫systemd的东西，这个sytemd取代了(system v)init的父进程身份，说是改良了init的一些缺点。至于两者的区别，可参阅（https://www.ibm.com/developerworks/cn/linux/1407_liuming_init3/index.html），写的很详细。

2，查看

        注意那句注释语句（if /etc/rc.local is executable）。

guoyanzhang@bogon:~$ cat /lib/systemd/system/rc.local.service 
#  SPDX-License-Identifier: LGPL-2.1+
#
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.

# This unit gets pulled automatically into multi-user.target by
# systemd-rc-local-generator if /etc/rc.local is executable.
[Unit]
Description=/etc/rc.local Compatibility
Documentation=man:systemd-rc-local-generator(8)
ConditionFileIsExecutable=/etc/rc.local
After=network.target

[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0
RemainAfterExit=yes
GuessMainPID=no

3，新建

      从上面可以看到新建一个rc.local，就可以添加自己要开机执行的文件了。

guoyanzhang@bogon:~$ sudo cat /etc/rc.local 
[sudo] guoyanzhang 的密码：
#!/bin/bash
cd /home/guoyanzhang/os
mkdir rclocal

4，补充

自systemd取代init之后，都是以服务的方式来执行脚本。

start：

guoyanzhang@bogon:~$ systemctl start rc-local
guoyanzhang@bogon:~$ systemctl status rc-local
● rc-local.service - /etc/rc.local Compatibility
   Loaded: loaded (/lib/systemd/system/rc-local.service; enabled-runtime; vendor preset: enabled)
  Drop-In: /lib/systemd/system/rc-local.service.d
           └─debian.conf
   Active: active (exited) since Sat 2019-01-19 23:15:30 CST; 26min ago
     Docs: man:systemd-rc-local-generator(8)
  Process: 877 ExecStart=/etc/rc.local start (code=exited, status=0/SUCCESS)

stop：

guoyanzhang@bogon:~$ systemctl stop rc-local
guoyanzhang@bogon:~$ systemctl status rc-local
● rc-local.service - /etc/rc.local Compatibility
   Loaded: loaded (/lib/systemd/system/rc-local.service; enabled-runtime; vendor preset: enabled)
  Drop-In: /lib/systemd/system/rc-local.service.d
           └─debian.conf
   Active: inactive (dead) since Sat 2019-01-19 23:42:45 CST; 11s ago
     Docs: man:systemd-rc-local-generator(8)
  Process: 877 ExecStart=/etc/rc.local start (code=exited, status=0/SUCCESS)

参考1：https://www.cnblogs.com/flymeng/p/7901062.html

参考2：http://blog.51cto.com/cakong/1618364