Debian 9.x “stretch” 解決 /etc/rc.local 開機啟動問題
由於某些軟體並沒有增加開啟啟動的服務，很多時候需要手工添加，一般我們都是推薦添加命令到 /etc/rc.local 文件，但是 Debian 9 默認不帶 /etc/rc.local 文件，而 rc.local 服務卻還是自帶的
root@debian9 ~ # cat /lib/systemd/system/rc.local.service
# 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
ConditionFileIsExecutable=/etc/rc.local
After=network.target
[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0
RemainAfterExit=yes
GuessMainPID=no
並且默認情況下這個服務還是關閉的狀態
root@debian9 ~ # systemctl status rc-local
- rc-local.service – /etc/rc.local Compatibility
Loaded: loaded (/lib/systemd/system/rc-local.service; static; vendor preset: enabled)
Drop-In: /lib/systemd/system/rc-local.service.d
└─debian.conf
Active: inactive (dead)
為了解決這個問題，我們需要手工添加一個 /etc/rc.local 文件
cat <<EOF >/etc/rc.local
#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will “exit 0” on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
exit 0
EOF
然後賦予許可權
chmod +x /etc/rc.local
接著啟動 rc-local 服務
systemctl start rc-local
再次查看狀態
root@debian9 ~ # systemctl status rc-local
- rc-local.service – /etc/rc.local Compatibility
Loaded: loaded (/lib/systemd/system/rc-local.service; static; vendor preset: enabled)
Drop-In: /lib/systemd/system/rc-local.service.d
└─debian.conf
Active: active (exited) since Thu 2018-03-01 09:45:18 UTC; 14s ago
Process: 20901 ExecStart=/etc/rc.local start (code=exited, status=0/SUCCESS)
Aug 09:45:18 xtom-proxy systemd[1]: Starting /etc/rc.local Compatibility…
Aug 03 09:45:18 tom-proxy systemd[1]: Started /etc/rc.local Compatibility.
然後你就可以把需要開機啟動的命令添加到 /etc/rc.local 文件，放在 exit 0 前面即可，並嘗試重啟以後試試是否生效
參考資料: Where is rc.local in Debian 9 (Debian Stretch)
https://stackoverflow.com/questions/44797694/where-is-rc-local-in-debian-9-debian-stretch
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