改了SSH端口号，但不生效？可尝试禁用 systemd socket activation

[silverwolf42]

我的设备: N1 镜像：Armbian_23.08.0_amlogic_s905d_bookworm_6.1.32_server_2023.06.05.img

1.编辑 nano /etc/ssh/sshd_config

-#Port 22
+Port 50022

2.重启 systemctl restart sshd

sshd 仍然监听 22 端口？

[ophub]

重启ssh服务后，你ssh连接你新改的端口试试。
我的盒子都不是22，都是自定义的端口，没发现有问题。

[silverwolf42]

重启，重连，还是22端口 (Server listening on :: port 22 )，我就不信改不了了 , 不过自个还是没弄明白😂

其他配置都生效了的，比如 PermitRootLogin no PubkeyAuthentication yes PasswordAuthentication no

root@armbian:~# systemctl restart sshd
root@armbian:~# systemctl status sshd
● ssh.service - OpenBSD Secure Shell server
     Loaded: loaded (/lib/systemd/system/ssh.service; enabled; preset: enabled)
     Active: active (running) since Fri 2023-06-09 19:01:21 CST; 1s ago
TriggeredBy: ● ssh.socket
       Docs: man:sshd(8)
             man:sshd_config(5)
    Process: 34769 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=0/SUCCESS)
   Main PID: 34770 (sshd)
      Tasks: 4 (limit: 1797)
     Memory: 11.7M
        CPU: 131ms
     CGroup: /system.slice/ssh.service
             ├─34405 "sshd: silverwolf [priv]"
             ├─34407 "sshd: silverwolf@pts/0"
             ├─34408 -bash
             └─34770 "sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups"

Jun 09 19:01:21 armbian systemd[1]: Starting ssh.service - OpenBSD Secure Shell server...
Jun 09 19:01:21 armbian systemd[1]: ssh.service: Found left-over process 34405 (sshd) in control group while starting unit. Ignoring.
Jun 09 19:01:21 armbian systemd[1]: This usually indicates unclean termination of a previous run, or service implementation deficiencies.
Jun 09 19:01:21 armbian systemd[1]: ssh.service: Found left-over process 34407 (sshd) in control group while starting unit. Ignoring.
Jun 09 19:01:21 armbian systemd[1]: This usually indicates unclean termination of a previous run, or service implementation deficiencies.
Jun 09 19:01:21 armbian systemd[1]: ssh.service: Found left-over process 34408 (bash) in control group while starting unit. Ignoring.
Jun 09 19:01:21 armbian systemd[1]: This usually indicates unclean termination of a previous run, or service implementation deficiencies.
Jun 09 19:01:21 armbian sshd[34770]: Server listening on :: port 22.
Jun 09 19:01:21 armbian systemd[1]: Started ssh.service - OpenBSD Secure Shell server.

[silverwolf42]

破案了：

最新的这个 openssh-server 包，它默认采用了 systemd socket 来激活 sshd 服务，据说可以节省3MB内存😂，所以 sshd_config 的 Port 22失效了。

如何解决：

长话短说，咱不太习惯，还是禁用了 systemd socket activation 恢复以往的配置方式

systemctl disable --now ssh.socket
systemctl enable --now ssh.service

原文：https://discourse.ubuntu.com/t/sshd-now-uses-socket-based-activation-ubuntu-22-10-and-later/30189

[ophub]

好的，感谢分享

[ophub]

91f572f

这个调整我已经加入到默认修复脚本了，以后的镜像默认采用原方案。
已经安装的用户可以同步脚本进行修复

armbian-sync
armbian-fix