需要root权限：可以sudo 但是我习惯直接su
su
passwd：
vim打开末尾添加几行：
vi /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
# added by yourself
[Install]
WantedBy=multi-user.target
Alias=rc-local.service
保存退出。
把刚保存的文件链接到/etc/systemd/system/目录下：
ln -s /lib/systemd/system/rc-local.service /etc/systemd/system/rc-local.service
打开 /etc/rc.local 输入：
vi /etc/rc.local
#!/bin/bash
autossh -M 8888 -NR 1234:localhost:22 root@101.201.235.247 -p 22 &
exit 0
保存，退出，赋权限
chmod 755 /etc/rc.local
reboot
但是，重启后，启动时网络还没连接，导致该命令还是无法运行？还没验证。
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