Ubuntu 24.04 修改 ssh 监听端口

系统

 lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 24.04 LTS
Release:	24.04
Codename:	noble

Ubuntu 24.04 使用了 socket activation 机制

查看 socket 配置

systemctl cat ssh.socket

查看 service 配置

systemctl cat ssh.service

# 查看依赖关系

systemctl list-dependencies ssh.socket

# systemctl cat ssh.socket
# /usr/lib/systemd/system/ssh.socket
[Unit]
Description=OpenBSD Secure Shell server socket
Before=sockets.target ssh.service
ConditionPathExists=!/etc/ssh/sshd_not_to_be_run[Socket]
ListenStream=22
Accept=no
FreeBind=yes[Install]
WantedBy=sockets.target
RequiredBy=ssh.service

# cat /usr/lib/systemd/system/ssh.socket
[Unit]
Description=OpenBSD Secure Shell server socket
Before=sockets.target ssh.service
ConditionPathExists=!/etc/ssh/sshd_not_to_be_run[Socket]
#ListenStream=22
ListenStream=26222
Accept=no
FreeBind=yes[Install]
WantedBy=sockets.target
RequiredBy=ssh.service

systemctl daemon-reload
systemctl restart ssh.socket

# ss -tlnp | grep sshd
LISTEN 0      4096               *:26222            *:*    users:(("sshd",pid=3637,fd=3),("systemd",pid=1,fd=82))