Debian 12系统中Fail2Ban启动失败的问题求助

我在Debian 12上部署Fail2Ban时遇到了启动失败的问题，折腾了好一阵都没搞定，想请教大家帮忙看看具体问题出在哪，该怎么解决。

下面是我操作的完整过程和报错信息：

安装Fail2Ban #

首先我执行了安装命令：

sudo apt-get install fail2ban

安装完成后的输出如下：

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
fail2ban is already the newest version (1.0.2-2).
The following packages were automatically installed and are no longer required:
libslirp0 pigz slirp4netns
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 71 not upgraded.

启用并启动服务 #

接着我启用了Fail2Ban服务：

sudo systemctl enable fail2ban

输出显示启用成功：

Synchronizing state of fail2ban.service with SysV service script with /lib/systemd/.systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable fail2ban

然后尝试启动服务：

sudo systemctl start fail2ban

看起来启动命令没有报错，但当我用下面的命令查看服务状态时，发现服务其实启动失败了：

sudo systemctl status fail2ban

状态输出如下：

× fail2ban.service - Fail2Ban Service
Loaded: loaded (/lib/systemd/system/fail2ban.service; enabled; preset: enabled)
Active: failed (Result: exit-code) since Wed 2024-02-14 12:48:29 EST; 1min 49s ago
Duration: 108ms
Docs: man:fail2ban(1)
Process: 9493 ExecStart=/usr/bin/fail2ban-server -xf start (code=exited, status=255/EXCEPTION)
Main PID: 9493 (code=exited, status=255/EXCEPTION)
CPU: 103ms

Feb 14 12:48:29 [REDACTED HOSTNAME] systemd[1]: Started fail2ban.service - Fail2Ban Service.
Feb 14 12:48:29 [REDACTED HOSTNAME] fail2ban-server[9493]: 2024-02-14 12:48:29,128 fail2ban.configreader [9493]: WARNING 'allowipv6' not defined in 'Definition'. Using default one: 'auto'>
Feb 14 12:48:29 [REDACTED HOSTNAME] fail2ban-server[9493]: 2024-02-14 12:48:29,140 fail2ban [9493]: ERROR Failed during configuration: Have not found any log file for sshd jail>
Feb 14 12:48:29 [REDACTED HOSTNAME] fail2ban-server[9493]: 2024-02-14 12:48:29,145 fail2ban [9493]: ERROR Async configuration of server failed
Feb 14 12:48:29 [REDACTED HOSTNAME] systemd[1]: fail2ban.service: Main process exited, code=exited, status=255/EXCEPTION
Feb 14 12:48:29 [REDACTED HOSTNAME] systemd[1]: fail2ban.service: Failed with result 'exit-code'.

我的困惑 #

从报错信息里能看到关键问题是找不到sshd jail对应的日志文件，我在网上查了不少资料，大家都提到要修改SSHD的jail配置文件，但各种说法太杂乱了，我完全摸不清头绪，不知道具体该怎么调整配置才能解决这个问题。有没有大佬能给我清晰的步骤指导呀？

备注：内容来源于stack exchange，提问作者Dynamic Orchid