新的rc.local的服务还是在的，只是关掉了。
debian 11
并且默认情况下这个服务还是关闭的状态：
root@debian ~ # systemctl status rc-local
● rc-local.service - /etc/rc.local Compatibility
Loaded: loaded (/lib/systemd/system/rc-local.service; static)
Drop-In: /usr/lib/systemd/system/rc-local.service.d
└─debian.conf
Active: inactive (dead)
Docs: man:systemd-rc-local-generator(8)
为了解决这个问题，我们需要手工添加一个 /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
然后赋予权限： 注意要授权可执行！！！
chmod +x /etc/rc.local
接着启动 rc-local 服务：
systemctl start rc-local
systemctl enable rc-local
再检查下相关服务是否启动
systemctl status rc-local
